Post on 14-Apr-2018
7/29/2019 Tai Lieu TTQ GD CH Khoa 8 (Slide)
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Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
NI DUNG MN HC THNG TIN QUANG
Phn 1:Cc khi nim c bn trong k thut thng tin quangGing vin: Hong Vn V -Hc vin Cng ngh BCVT
Phn 2:Cc phn t c bn trong k thut thng tin quang
Ging vin: Hong Vn V -Hc vin Cng ngh BCVT
Phn 3:C s k thut thng tin quangGing vin: Hong Vn V -Hc vin Cng ngh BCVT
Phn 4:Mt s cng ngh thng tin quang tin tin
Ging vin: V Tun Lm -Hc vin Cng ngh BCVT
Phn 5:H thng thng tin quangGing vin: V Tun Lm -Hc vin Cng ngh BCVT
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NI DUNG MN HC THNG TIN QUANG
Phn 1:Cc khi nim c bn trong k thut thng tin quangGing vin: Hong Vn V -Hc vin Cng ngh BCVT
Phn 2:Cc phn t c bn trong k thut thng tin quang
Ging vin: Hong Vn V -Hc vin Cng ngh BCVT
Phn 3:C s k thut thng tin quangGing vin: Hong Vn V -Hc vin Cng ngh BCVT
Phn 4:Mt s cng ngh thng tin quang tin tin
Ging vin: V Tun Lm -Hc vin Cng ngh BCVT
Phn 5:H thng thng tin quangGing vin: V Tun Lm -Hc vin Cng ngh BCVT
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Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
NI DUNG CHNG TRNH HC
I. CC CNG NGH MI TRONG THNG TIN QUANG
1. K thut khuch i quang
2. K thut ghp knh quang3. K thut Coherent
4. K thut truyn dn Soliton
5. Cc hiu ng phi tuyn
6. Cc thit b v thnh phn quang t hp7. Xu hng mng quang th h sau
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TI LIU THAM KHO
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TI LIU THAM KHO
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K THUT KHUCH I QUANG
Gin nng lng ca Erbium
Mc kch thch
Mc siu bn
Tn hiu ti Tn hiu ckhuch i
Signal photon
Mc c bn
Bm nnglng=980nm
phn r khngbc x
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Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
K THUT KHUCH I QUANG
bmbm
E2 E2
E3 E3
E4
E1E1
b)a)
Phn rPhn r
Phn r
C ch bc x 3 mc v 4 mc
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Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
K THUT KHUCH I QUANG
Ph hp th ca si quang thng thng v si quang Erbium
2,0
1,0
0,2
0,1
2,0
1,0
0,2
0,10,9 1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7
bc sng (m)
0,89m1,53-1,56m1,48m
Suyhaos
ithng(dB/km)
hpthkhuch
isiErbium(dB/km)
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K THUT KHUCH I QUANG
Cc b khuch i quang si pha tp ErbiumH s hp th v pht x ph ca Ge:SiO2 EDFA l mt hm phu thuc di si pha tp
1.46 1.48 1.5 1.52 1.54 1.56 1.580
2
4
6
8
10
12
avelength (um)
Absorption/ GainCoefficient(dB/m)
Gain and Absorption Coefficient Spectral Profile of Ge:SiO2 EDFA
Absorption
Gain
0 10 20 30 40 50 60-60
-40
-20
0
20
40
60
EDFA Small-Signal-Gain vs Pump-Power for Fiber Lengths at 1.55um Signal & 1.48um Pump
Normalised Input Pump Power Pp/Ppth
Gain
(dB)
L = 8m7m
6m5m4m3m2m1m
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K THUT KHUCH I QUANG
S cu trc mt modul EDFA
Input
CouplerB cch ly
WDM
B cch ly
Laser bm
Output
EDFA
bm
Tn hiu
Cngsut
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K THUT KHUCH I QUANG
ng dng ca khuch i quang:
Khuch i bcho b chia
B chia
Khuch i u ra
Tx
Khuch i ng truyn
Tin khuch i
Rx
Rx
Rx
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Module khuch i quang
K THUT KHUCH I QUANG
Cc b khuch i quang si pha tp Erbium
Cc si quang c bit c phatp cc ion Erbium c di
khong vi chc mt
Ngun Laser bm bcsong ngn hn
Cc tn hiu uvo knh DWDM
cn khuch i
Si quang
Mi hn
Bm Tn hiu nh sngc khuch i
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K THUT KHUCH I QUANG
Cc b khuch i EDFA hai chiu hin nay c thng mi ho
MOR (Midspan optical repeater - Trm lp quang)
Khuch i hai chiu 16 bc sng (c th t 128 hoc 256vi tc Tb/s)
Gii bc sng 1528-1561 nm (bng v xanh)
MOR Plus (MOR ci tin)
Khuch i hai chiu 32 bc sng
Gii bc sng 1528-1561 nm (bng v xanh
per band access (PBA) and mid-stage access (MSA)
RED IN/BLUE OUT
RED OUT/BLUE IN
MSApre MSApost
OUT
OUT
IN
IN
COM
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K THUT KHUCH I QUANG
Hiu ng RAMAN
Giao ng phn t --> Cng hng wv Thay i chit sut -> Stokes & Anti-stokes
Raman kch thch khi trng Stokes giao ng
wvwp
StokesCc giao ng phn t l thay i chit sut Trng Stokes y mnh giao ng phn t
w=w - w p swp
w=w + wa p
w=w - ws p
wp
ws
Anti-Stokes
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K THUT KHUCH I QUANG
Kt hp khuch i RAMAN nh phn m rng ca khuch i EDFA
Blue RFA
Red RFA
E-band EDFA
C-band EDFA
PumpArray
0
5
10
15
20
25
30
1440 1450 1460 1470 1480 1490 1500 1510 1520 1530 1540Wavelength in nm
Ga
inindB
0
5
10
15
20
25
30
1580 1600 1620 1640 1660 1680 1700Wavelength (nm)
Ga
in(dB)
H i C h BCVT
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K THUT KHUCH I QUANG
Cc c tnh ca khuch i quang
chnh lch khuch i
dc khuch i
Mt n v d phng cng sut
Khuch i pht x t pht (ASE) v h s nhiu (NF)
FEC (Forward Error Correction CodingM sa li trc)
thit thi ca h thng
gn, dc v khuch i pht x t pht tch lu mi b khichi s lm thay i rng ca cng sut gi cc bc sng.
Nh vy u thu s phi gii quyt nhiu vn do tn hiu nhn cc cng sut khc nhau.
Vic cn bng thng qua iu chnh ngun pht cho mi bc sng khi tn hiu n cui ng truyn tng ng v mt cng sut
H i C h BCVT
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K THUT KHUCH I QUANG
chnh lchkhuchi B khuch i l tng phi c
khuch i nhu nhau i vittc cc bc sng.
Trong thc t cho thy cc bcsng khc nhau c cc khuci khc nhau.
chnh lchkhuchi l ctnh cho trng hp xu nhtchnh lch vi khuch iphng cho thitk DFG.
Khuch i quang ca mt hthng c c trng bi h sgc chnh lchkhuchi.
dckhuching dc khuch i ng l t l
thay icabc sng btkivi khuchica cc bcsng, cho thykhuchicamt knh trc tip nh hngn cc knh khc
H i C h BCVT
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K THUT KHUCH I QUANG
Mtn cng sut Cho thyu ra lnnht c thvimtdu vo cho trc
Optical Amplifier Power Mask
Blue Band
-15
-10
-5
0
5
10
15
-36 -26 -16 -6 4
Total Input Power (dBm)
TotalOutputPowerdBm)
H i C h BCVT
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K THUT KHUCH I QUANG
Nhiu khuch i pht x t pht (ASE) ASE l nhiu quan trng nht nh hng n thit k ng truyn
Trong qu trnh khuch i, cc in t thay i trng thi nng lng vpht ra photon.
Cc photon ny b xung nng lng vo cc bc sng tn hiu
Cc photon cng pht x t pht vo cc bc sng khng mang tn hiu Chng c to ra v khuch i thng qua cc b khuch i
ASE lm tng hiu ng MI dn n nhng kt qu bt li
Trong h thng:
ASE tng ng vi h s khuch i
ASE tng ng vi nhiu in t sau khi thu tn hiu c tnh ca ASE c xc nh bi dc khuch i, chnh lch
khuch i v h s nhiu nh l mt bc sng tn hiu.
ASE tch lu lm gim OSNR mi b khuch ic ngha l chng gii hns cc b khuch i trn tuyn
H i C h BCVT
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K THUT GHP BC SNG QUANG
H i C h BCVT
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K THUT GHP BC SNG QUANG
Nguyn l k thut ghp bc sng quang
(a) H thng ghp bc sng theo mt hng(b) H thng ghp bc sng theo hai hng.
1,2,.......nMUX
DMUX
Tx1
Tx2
Rx1
Rxn
Rx2
Txn
(a)
1,2,......n
1,2,......n
MUX/DMUX
MUX/DMUX
Tx1
Tx2
Rx1
Rxn
Rx2
Txn
TxnRxn
(b)
Hc vin Cng ngh BCVT
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K THUT GHP BC SNG QUANG
Thit b WDM
Tch ccTh ng
Cc ngun phtquang v cc b tch
sng quang nhiubc sng
Ghp siThit b vi quang
Cc thit bkhc
Thit b quangt hp
Phn tn gc
Phn ccGiao thoaPhi tuyn
Thit b c b lc
Cch tPhn tn vt liu
Hc vin Cng ngh BCVT
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K THUT GHP BC SNG QUANG
n
11,...., n
Cch t
S dng cch t tch bc sng
Hc vin Cng ngh BCVT
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K THUT GHP BC SNG QUANG
1
n
1,....,n
1,....,n
2,....,n 1
B lcgiao thoa
Thit b phntn gc
Nguyn l hot ng ca thit b WDM vi cu trc:B lc giao thoa v phn tn gc
:::::
:::::
1,...., n
b lc 1
2
1
43
:::::
:::::
Cu trc c bn mt b gii ghp giao thoa nhiu knh
Hc vin Cng ngh BCVT
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K THUT GHP BC SNG QUANG
Mt b gii ghp giao thoa nhiu knh trn thc t
21,...., 5
1
4
53
B lc
Si quang
Lng knh Grin
Khi trongsut
Hc vin Cng ngh BCVT
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K THUT GHP BC SNG QUANG
a) s dng cch t kt hp vi thu knh tch/ghp bc songb) Kt hp b lc vi thu knh tch/ghp bc sng
1
1,22
1
12
2
Cch tLng knh chun trc
a) Lng knh Grin
Cch t
b)
Hc vin Cng ngh BCVT
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K THUT GHP BC SNG QUANG
Cc tham s c bn Suy hao xen: lng tn hao cng sut trn tuyn truyn dn quang
Li=-10logO(i)/Ii(i) (i vi b MUX)
Li=-10logOi(i)/I(i) (i vi b DeMUX)
Xuyn m: do d tn hiu t knh ny sang knh kia
Do c tnh b lc khng hon thin
Do ph ca ngun pht chng ln ln nhau
Do phn x hay hi t
Do hiu ng phi tuyn
rng ph ca knh: Gii bc sng dnh cho mi knh
DEMUXSi quang
I(i).......I(k)
Oi(i)+ Ui(k)Si quang
I(i).......I(k)
O(j)
j
k
Ij(j)
Oi(i)+ Ui(k)+ Ui(j)
Hc vin Cng ngh BCVT
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CC PHN T MNG QUANG WDM
Ngun quang B ghp knh quang
Si quang
B tch knh quang
B u cho knh quang
B ghp knh xen r quang
Nt chuyn mch quang
B chuyn i bc sng
Khuch i quang
B cn bng khch i quang Khuch i bng rng
nh tuyn quang
Hc vin Cng ngh BCVT
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CC PHN T MNG QUANG WDM
SI QUANGTN SC DC NG TN SCHIU NG PHI TUYN
Mux/DemuxB LC QUANG HPCHYUN I BC SNGMO DO LC QUANG
KHUCH I QUANGGII HN BNG TN (C-, L-)SUY BIN NF KHI CNGXUT U VO CAO
NN PHPHI HP IU CHBWTN SC SI
LC QUANGAWGB LC A LP
Equalisation
Double stage EDFA
ROA, EDFA+ROA
IU KHIN V GIM ST A BC SNGTHAM CHIU CHNH XC BC SNG
B TN SC QUN L V SP XP DMPolarisation Division Mux (Odd/Even channels)
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
Xut x: H thng ang s dng hin nay l iu bin cng tch trc tip
E(t)=Eoei(w(t)+)
Nng cao nhy thu
-40
-60
102 104-80
103
Thu trc tip
Thu Coherent
Tc ng truyn (Mbit/s)
nhy thu (dBm)
Thu trc tip
Thu Coherent
400
300
200
100
1010,10,01
Khong lp (km)
Tc ng truyn (Gbit/s)
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
Bn cht nh sng: bin , tn s, pha, phn cc
Laser: pha kt hp
Cohernet: phn cc c ch
La chn knh pha thu
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
S khi ca h thng thng tin quang Coherent
Tn hiu ra
Giiiu
Daongni
iuchngoi
LASERDIODE
Lcvng
AFC
Trnquang
iukhin
~
~~
Tn hiu vo
Siquang
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
IU CH
Lc v giiiu ch
LaserwS
Laser dao ng
ni (wLO)
Ngun pht
(ASK,PSK)B trn
Khuch i
Photodiode
FSK
Thu coherent
Tn hiu IF (wS - wLO)
S nguyn l hot ng ca h thng thng tin quang Coherent
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
iu ch trc tipTrng in t tn hiu truyn i c dng sng phng
Dng in tch trc tip:
Sau khi b lc b tch sng:
I E E A t D D S S S S S
= = + +* [ cos( )]1
21 2 22 w
I EsE
sAsDD = =
* 1
2
2
E As s s st t= +cos ( )w
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
iu ch CoherentTrng dao ng ni c dng:
ICoh (t)= =
Trong : (t)= s(t)- LO(t): lch pha gia tn hiu v dao ng ni
E A t tLO LO LO LO= +cos ( )w
E ES LO+2 1
2
1
2
2 2A A A A t t ts LO s LO s LO+ + - +cos[( ) ( )]cos ( )w w
cos ( ) tE E
EsE
s
LO
LO
=
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
iu ch Coherent (tip)
lch phn cc gia tn hiu v dao ng ni
Do P(t) I, P(t): cng sut quang
wIF= wSwLO Trung tn ~ vi trm Megahez vi PLO >> PS
P t P P P P t t ts s sLO LO LO( ) cos ( ) cos ( )= + + - +2 w w
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
So snh thu trctip v thu Coherentuimchyuca thu Coherent (tch sngitn) so vithu trc
tip l tngnhyca my thu. C haiyutdnnuimny l:
Ci thin c t s tn hiu/nhiu (S/N) u ra ca b tin
khuchi do itn. trong trnghp l tng, S/N c dng Nng cao cuimvn c trong l thuyt thng tin khi s
dngkthutiuch v giiiuch .
Trong trnghp l tng, (S/N) c dng
(S/N) ltng
(S/N) trong trnghp tch trctipsdng APD l:
(S/N) DD
Hc vin Cng ngh BCVT
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K THUT THNG TIN QUANG COHERENT
u im thng tin quang Coherent Tng nhy thu
Tng bin
Gim tn s
Tch tn hiu theo mun ti pha thu
Hc vin Cng ngh BCVT
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g g Ti liu ging dy cao hc kho 8
HIN TNG TN SC
Hc vin Cng ngh BCVT
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CC HIU NG PHI TUYN
I. L THUYT C BN V QUANG HC PHI TUYN
II. QUANG SI PHI TUYN
Hiu ng Raman
Hiu ng Brillouin
Hiu ng t iu ch pha SPM
Hiu ng iu ch pha cho XPM
Hiu ng trn bn bc song
III. NH HNG CA HIU NG PHI TUYN N CHT LNG
TRUYN DN CC H THNG THNG TIN QUANG V CC NG
DNG
Hc vin Cng ngh BCVT
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CC HIU NG PHI TUYN
Ngoi c tnh suy hao, tn sc; phi tuyncng l mtc tnh cbncasi quang. Tuy nhin tnh phi tuyn ca si quang ch th hin khi cng
sut tn hiu trong si quang ln v s lm thay ihotngcah
thngnh xuyn m gia cc knh, suy gimmc cng sut tn hiuca
cc knh dnn suy gimts S/N.Phn ng ca cc in t lin kt i vi mt trng quang mnh l
nguyn nhn cahiung Kerr, hocchitsutph thuc vo cng
nh sng ti, trong khi s c mtca cc trng thi dao ngca mi
trng(hoc phonon) s gy ra cc hintng tn x Raman v Brillouin.
Hc vin Cng ngh BCVT
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CC HIU NG PHI TUYN
Thng thng cc hiu ng phi tuyn c quan tm ti mttrong ba quan im:
Thnht, trnh cc hiung phi tuynhoc lm cho chng cng nh cng tt.
iu ny thccht l cithin cc iukin sao cho cng sutt gi trlnnht c
thc, cng vi n l gim S/N v lm cho dung lnghthnglnnht.
Quan imth hai, hin nay nhncnhius ch l lidnghiung phi
tuyncithinc tnh truyndncasi quang. Chnghnnhsdng b tn
sc phi tuyn,khuchi tn hiu v hthngtruyndn soliton.
Mt quan imth ba, angrtc quan tm l cchhotngx l tn hiuquang, trong cc hiung phi tuynmnhc ch sdng cho vicmt tn
hiu nh sng iukhinmt knh dliu khc.
Hc vin Cng ngh BCVT
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CC HIU NG PHI TUYN
mc cng sut thp,vct phn cc ca vt liu in mi c mi quan hvivectorcngintrng E sao cho:
P=e0cETronge0 l hngsin mica chn khng, e0cl hs phn ccca mi
trng. Cngthctrn chngkhitrngtcdngnh so vitrnglin kt
mtintv mtnguyn t.
trng quang mnh c mcnnglng cao hn,trng tc dng gy ra cc hot
ng phi iu ho ca cc int lin ktdnnmi quan h phi tuyngia vector
phn cc v trng tc dng. c thhinbng cng thc qua cc shng
cmin cao hn.P=e0(c (1)E+c (2)EE+c(3)EEE+...)
Trongc(2)E v c(3)El cchs phituyn. Chnh skhc nhau ca quang
trngtcdngto nn mtshintngquanghcphituyn
Hc vin Cng ngh BCVT
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CC HIU NG PHI TUYN
Tng tc phi tuyngia tn hiu v mi trngtruyndnsi quang silicat btuxuthin khi cng sut tn hiu quang tngtcc l di hn v tc
cao hn. Do , tc ngcasi quang phi tuynthhin r khi xem xt c
hai vn quan trng l hthng dung lng cao v ngtruyn khng blp
khong cch ln.
Tnh phi tuyn c th phn loi theo tn xca chng (tn x kch thch Brillouin
v tn x kch thch Raman) hoc cc hiung lin quan tihiung Kerr l
chitsut ph thuccng (iu ch t dch pha, iuch pha cho, tnh
khng nnhiubinhoctrnbbc sng).
Tnh adngca cc yutnhhngti tnh chtchcahiung phi tuyn,bao gmcc tnh tn scsi, vng li hiudngcasi,slng v khong
cch cc knh trong hthng, ton b di hthng khng trmlpcngnh
cng tn hiu v giitnngun pht.
Hc vin Cng ngh BCVT
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HIU NG TN X KCH THCH RAMAN (SRS)
Tn x Raman kch thch l mthiung gin bng, trong bao gmtng tcca nh sng v cc phonon quang hc. nh sng b dch tnmt khong 15
THz.
SRS c thxuthin trong chthngn knh v a knh.ivihthng
n knh hiung SRS c thnhhngnchtlnghthng th mc
cng sutngngphI >1W.ivih thng WDM th mc cng sut ny s
thphnnhiuc vi mW do c hintngkhuchiivi cc bc sng
ln, trong khi cng sutca cc knh c bc sng nhligimi. Ktqu l s
giihntng dung lnghthngda trn tngs cc knh, khong cch gia
cc knh, trung bnh cng sutu vo v di ton hthng.
Ngng SRS cho hthng p dngsi G.653 thphnmt cht so vihthng
sdng G.652. SRS hunh khng lm suy gimhthngn knh; ngcli
c th lm giihnkhnngnngcahthng WDM.
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HIU NG TN X KCH THCH RAMAN (SRS)
HNCH CC NHHNGCAHIUNG RAMAN
Trong h thngn knh, c thsdng cc b lc loib cc ph khng
mong mun, l cc ph to nn cc mm cho tn x Raman c kch thch.
Cha c kthutthct no loitr SRS trong hthnga knh c chnhthc cng b tuy nhin vic tngkhong cch cc knh c th lm gim SNR.
Hiung SRS cn c thcgimbtbng cch gim cng sutu vo.
Hc vin Cng ngh BCVT
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HIU NG TN X KCH THCH BRILLOUIN (SBS)
Trong hiu ng SBS, nh sng truyn xui b tn xbi cc phonon m hc. Tuy
nhin, chc cc nh sng tn xngc trong si quang n mode do iukin
hp pha ca cc vct sng. nh sng tn xbdchxungkhong 11 GHz
bc sng 1550 nm.
Trong cc hiu ng phi tuyn trnh by y, SBS c cng sut ngng thp
nht. Ngng SBS cho h thng trin khai si G.653 thp hn l h thng s
dngsi G.652 do si G.653 c vng hiudngnhhn.
Ngng SBS dbnhhng do ditn
v mc cng sutngun pht v cngph
thuc vo s knh.
Hc vin Cng ngh BCVT
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HIU NG TN X KCH THCH BRILLOUIN (SBS)
Hiung SBS dn tigiihn s lng nh sng c th truyn qua si quang.Trong trnghptng qut ngng SBS cthhin.
PKA
gLtheff
eff
p B
B
= +
21
-35
-25
-15
-5
5
15
25
caerepower
m
HN CH CC NH HNG CA
HIU NG BRILLOUIN
Di tn ngun pht nh hn bng
tn Brillouin
Gim cng sut pht
Ngng tn x Brilloum kch thch vi ngun pht bng hp
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HIU NG T IU CH PHA (SPM)
Hiung SPM thuc loihiung Kerr, tc l hiung trong chitsutca
mi trng thay i theo cng nh sng truyn theo cng thc.
N=n0 + nNL = n0 + n2E2
Trong hthngn knh, SPM sdndnmrngph tn hiudnnvic khi
thay icng quang sdnti thay i pha. Khi phbmrng do SPM, tnhiubmrnghn khi truyndc theo si khi c hiung tn sc trong vng tn
sc bnh thngcasi (v ddi vng bc sng tn scbng khng). Ngc
li trong vng tn scd thng, tn sc v hiung SPM c th b cho nhau,
dntivicph t btrirng. SPM trong cc tn hiuciuch c mc chirp
thpsdn tivic nn xung vi cc si G.652 v G.653 vi tn scdthng
nh l mt hm ca cng sut pht. Cc xung ny s lm mt tc dngca tn
sc v cho ta siutitv tn sc.
Hc vin Cng ngh BCVT
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HIU NG T IU CH PHA (SPM)
-VE CHIRP
RED SHIFT
+VE CHIRP
BLUE SHIFT
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HIU NG T IU CH PHA (SPM)
Cc hthng c giihnv tn sc c ths khng chuc cc hiung do
SPM gy nn. Trong h thnga knh vikhong cch gia cc knh kh nh,
vic gin phbi SPM c thcngto nn nhiugia cc knh link.
Pha tn hiu sau khong cch L l:
dch pha phi tuync xc nh qua:
HNCH CC NHHNGCAHIUNGTIUCH PHA
Sdngsi G.653 v xpxp cc knh tn hiugn vng tn scbng khng sgimnhhngca SPM.
Vi cc h thngngnhnkhong 1000km, SPM c thdciukhin thng
qua b xung b tn sc ph hpdc theo hthngsi quang G.652.
= =
+= +
2 2 0 2nL n n I t L cons t t[( ( )]
tan ( )
( ) ( )t n LI t =2
2
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HIU NG IU CH PHA CHO (XPM)
Hiung SPM c thcgimnhbng cch ti thiu cng sut quang uvo hoc hot ng bc sng trn bc sng tn sc bng khng vi si
G.655.
schitsut timtbc sng no khng chph thuc vo cngca
sng m cn ph thuc vo cng cc bc sng khc lan truyn trong
si. Trong hthnga knh, iuch pha cho (XPM) sdndn lm gin ph
tn hiu khi thay icng quang dnn thay i pha do tng tc gia knh
link. Vic gin xung do XPM lin quan ti phn bit knh, khi tn sc gy ra cc
vn tc nhm khc nhau s dn n cc xung nh hng ti tnh c lp khi
truyn trong si. Khi gin xung do XPM, tn hiub gin nhiuhn l khi truyntrong si c hiung tn sc.
Suy hao do XPM rt quan trong trong hthngsdngsi G.652, v c lin quan
tichthng G.653 v G.655. Vic gin rng do XPM c thdnnnhiugia
cc knh link trong hthnga knh.
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HIU NG IU CH PHA CHO (XPM)
HNCH CC NHHNGCAHIUNGIUCH PHA CHO
XPM c thiukhin thng qua lachnkhong cch gia cc knh sao cho ph
hp. Theo nghin cu,chc cc knh linkng gp ngk mo tn hiu do
XPM trong hthnga knh. SNR ca knh trung tm cahthng 3 knh s c xu
hngcahthngn knh nh knh phn bit tng.
Theo ,hiung XPM c thgimnh khi khong cch
gia cc knh tn hiu ph hp. Phn bitgia cc knh
100 GHz cho thy c thgimhiung XPM vi
hthng c cng sut 5mW/ knh. Penalti tn sc do
XPM c thcngiukhinc do b xung b tn
sc theo suththng.
Hc vin Cng ngh BCVTTi li i d h kh 8
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HIU NG TRN BN BC SNG (FWM)
FWM cn cgi l trnbn photon, xuthin khi tng tc ca 2 hoc 3 sng
quang c bc sng khc nhau pht ra mt sng quang mi, bc sng mi.
Tng tc ny c thxuthingia cc tn hiu trong mththnga knh, gia
nhiu OFA ASE v mtn knh, cngnhgiamt mode chnh v cc mode ph
camtn knh.Khi ba sng c tns fi,fj, v fk (k i,j) tng tc qua tnh nhy bn intbc ba
casi quang, chng sinh ra tns sng:
fjk = fi + fj - fk
f113
f123,213
f112 f223
f132,312
f221
f231,321
f332 f331
Fr
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HIU NG TRN BN BC SNG (FWM)
Do vic to ra cc tnsmi l thpca cc tns tn hiu nn hiungFWM s lm gim cng sutca cc knh tn hiu trong hthng WDM. Hn
nanukhong cch gia cc knh l bng nhau th nhngtnsmic
to ra c th ri vo cc knh tn hiu, gy xuyn m gia cc knh, lm suy
gimchtlngcahthng.
S suy gim cng suts lm cho dng hnh mtca tn hiuu thu b thuhpli do s lm gimchtlng BER cahthng. V cc hthng WDM
chyu lm viccasbc sng 1550 nm v do tn sccasi quang
n mode thng thng(si G.652) ticas ny l khong 18 ps/nm.km, cn
tn sccasi tn scdchchuyn(si G.653) l 0 (< 3 ps/nm.km) nn h
thng WDM lm vic trn sin mode thng thngs t bnhhngbihiung FWM hnhthng WDM lm vic trn si tn scdchchuyn.
Hc vin Cng ngh BCVTTi li i d h kh 8
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HIU NG TRN BN BC SNG (FWM)
nhhngcahiung FWM cng lnnunhkhong cch gia cc knhtrong h thng WDM cng nh cng nh khi khong cch truyn dn v mc
cng sutcami knh ln. V vyhiung FWM shnch dung lng v c
ly truyndncahthng WDM.
Tngs cc thnh phnmicto ra c th tnh nh sau:
m = 1/2 (N3 - N2) vi Nl s knh ban u Nhvyvihthng 3 knh s thnh phnmito ra l 9, nhngvihthng
8 knh s thnh phnmito ra l 224. Mt trong nhngphng php gim
btnhhngca FWM l sdng cch ghp khng u trong cc h thng
WDM. Tuy nhin chvih thng c 3 bc sng th vicb tr cc knh cn
ngin, cn vihthng 8 bc sng tr ln th vic tnh ton b tr ccknh litr nn rtphctp.
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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HIU NG TRN BN BC SNG (FWM)
HNCH CC NHHNGCAHIUNGTRNBBC SNG
Gimmc cng sutu vo cahthngsdngsi G.653 cng c th cho
php hotnga knh, tuy nhin c th lm hi tinhng thun li kinh t
cakhuchi quang.
khmt cch ph hp cc pht sinh qu trnh trn tn hiu,sdngsivi
tn sc cho php tithiu trong mt vng cabngtnkhuchi OFA c
nhtrc.
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HIU NG TRN BN BC SNG (FWM)
HNCH CC NHHNGCAHIUNGTRNBBC SNG (tip)
Cc khong xen knh cc si tn sc khc khng vi cc khong c c tnh
tn scngclicngc quan tm nhmtkhnnglachn, khi dn
n cp s thu c tn scmngxpsbng khng. Tngt c xu hng
sdng xen kmtsi c di lnvi tn scgiihnnh v mtsi c
di ngnnhng c giihn tn scngclilncngc l bin php khquan.
Khong cch khng ugia cc knh v khong cch gia cc knh lncng
ca ra l bin php gimhiung phi tuyn v cho php pht trinh
thng WDM trong hthng G.653. Khong cch cc knh khng u nhau m
bo rng qu trnh trn tnghp t 3 hocnhiuhn 3 knh khng thay i
trctip cc bc sng knh khc.
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NG DNG CC HIU NG PHI TUYN
ng dng trong cng tc o c (OTDR)
Khuch i Raman
Truyn dn Soliton
To cc thit b cng quang, tch knh quang thng qua mi trng si
quang v bn dn
Tch knh bng hiu ng Kerr
Tch knh bng hiu ng FWM
Tch knh bng gng vng quang phi tuyn
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TRUYN DN SOLITON
Truyndn Soliton da trn mthiung phi tuyn l SPM. Ta xt hin tngxy ra khi truyncc xung ccngn c mt cng sut cao
(xung soliton) trong si tn scthng. Nhvyphn chirp phi tuyn do hiung
SPM s thm vo phn chirp tuyn tnh do ngun v tn sc gy ra trn xung. Vy
xung b gin ra rt nhanh.
ivisi tn scd thng th hin tngng ch hn. Cnh ln ca xung
cngbdchv pha bc sng di do hiung SPM nhng trong vng tn scd
thng th chirp phi tuyn ny lingcvi chirp tuyn tnhdo ngun v tn sc
gy ra trong xung. Nh vy xung c hiu ng SPM b tn sc. Xung s
khng b mo dng d truynvikhong cch truyndn ln. Sau mt thi gian
truyn trong si cng sutca xung b suy hao v thphngioihn phi tuyn th
xung lib dn do nhhngca tn sc (lc nu xung dn nhanh hnhnc
trnghptruyn trong giihntuyn tnh).
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TRUYN DN SOLITON
100
80
60
40
20
00 20 40 60 80 100 120 140
-1 ps/nm/km
0 ps/nm/km
+1 ps/nm/km
Khong cch truyn dn (km)
rn
gxung(ps)
S dn xung do nh hng hiu ng SPM vi trng hp tn sc thng (D0)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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CC THIT B V THNH PHN QUANG T HP
Linh kin quang thpAWG (Array WaveGuide) Cch tdn sng theo hng AWG (Arrayed Waveguide Grating) cngda
trn nguyn l nhiux. Linh kin AWG bao gmmt hng cc ngdnsng cong vi chnh lch v chiu di ng dn c nh gia ccknh ln cn nhau (xem hnh 19). Cc ngdn sng cnivi cc hctiu vo v u ra. Khi nh sng vo hcu vo, n bnhiux v
truyn vo hng ngdn sng. Ti chnh lch di quang camingdn sng to ra str pha hcu ra, nimt hng cc sicghp li. Qu trnh ny dnn trong cc bc sng khc nhau c giaothoa ccinhngv tr khc nhau, tngngvi cc cngu ra.
Cch t dn sng theo hng
Hng ng dn sng
Hng cc
si
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CC THIT B V THNH PHN QUANG T HP
Linh kin quang thpFBT (Fussed Biconic Tapered)
Thit b FBT n gin nht c dng mt cp si quang n
mode c hn vi nhau theo chiu dc. Tn hiu nh sng
c pht trong li sixut pht ti vng c hn tmtsi
pha phisc phn bli thnh nhiu mode v khi n vtqua imgp nhau ca 2 li si. Khi cc sic tch ra th
cc mode vsi li thnh cc mode li micngsi li ra
(pha phi). Ktqu l ta s c mtb ghp hoc chia gnnh
khng gy suy hao.
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CC THIT B V THNH PHN QUANG T HP
Thitb OADMThitbxen/r knh quang (OADM) thchinchcnng thm vo v tchra mt knh tn hiut tn hiu WDM m khng gy ra nhiuvinhngknh khc trong si.
THITBXENRTHHTH1
O/E/O
O/E/O
1, 2...N 1, 2...N
O/E/OMUX/DEMUX
MUX
/DEM
UXO/E/O
Tch knh Xen knh
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CC THIT B V THNH PHN QUANG T HP
THITB
XENR
TH
H
TH
2Thitbxen/r quangthh thhaisdngnhnglinh kin quang thm vo hoctch rabcsng mongmun. Mts linh kin quanghinngcngdngch to thitbOADM l: cch tdn sng (AWG), Circulatorkthpvicch tBragg (FBG) v sdngtnggiao thoa Mach-Zehnder (MZI)
Thit b OADM da trn AWG
Trn hnh v biu din mt kiu thit b OADM da trn AWG. Bc sng l1 cxen vo lung ghp knh pha bn tri v tch ra t lung tn hiu u vo phabn phi. y l mt chc nng rt linh hot. Tuy nhin, s tn hao tn hiu i vilinh kin ny tng i ln, khong 5 dB. Nhng knh khng xen/r phi chu suy
hao n 10 dB.
1,2,3 1,2,3
1
1
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CC THIT B V THNH PHN QUANG T HP
THITB
XENR
TH
H
TH
2ThitbOADMda trn Ci rcu lator v FBG
Cu hnh ny c suy hao tng i thp, khong 3 dB di vi tn hiu ghp knh.Loi thit b OADM da trn nhng linh kin quang ny ph hp cho nhng ngdng trong mng ni ht.
u vo
Circulator
FBGCngtch
Cngxen
u ra
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CC THIT B V THNH PHN QUANG T HP
THITBXENRTHHTH2ThitbOADMda trn MZI
Trong kiu thit b ny, ngi ta s dng mt lot cc b ghp (coupler) cy trn nn planar
tao ra cc b giao thoa Mach-Zehnder (MZI). Mt bc sng c th xen hoc tch t dng tn
hiu ghp knh m khng gy ra bt c nhiu x no cho bc sng khc.Dng tn hiu WDMchuyn qua c a qua mt ng dn sng v bc sng c la chn s tch ra hoc xen
vo t ng dn sng khc. Vic tinh chnh c thc hin nh thay i tr trong mt ng dn
sng bng cch gia nhit vt liu qua in tr nhit.
Vn ln nht ca linh kin loi ny l kch thc. hot ng hiu qu c th cn n s
lng b ghp ni vi nhau phi t 15 b tr ln.
tn hiu u vo tn hiu u ra
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CC THIT B V THNH PHN QUANG T HP
Hin nayngi ta phttrinthitbOADM c cc tnhnngnhtuynbcsng ngy cng li nhhotda t rn cc linhkin quangtinh vi. C hailoiOADM trongthct:
Loixen/rbcsngcnh (Fixed WADM)Loi thitbOADMxen/rbc sngcnh hay cn gi l WADMcnh thc
hinxen/r ccbcsngcnh no .
Loixen/rbcsng thayi(Reconfigurable WADM)
Loi OADM th hai l WADM c th thay i cu hnh. Chc nng xen/r bcsng c th m bo vic thm hoc tch mt s knh (bc sng) no ticng xen/r ca thit b.
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CC THIT B V THNH PHN QUANG T HP
Thit b OXCtndngia dunglngtruyndnca cctuyn trongmngtruyntingita sdngthitbc chcnngunicho.
Di gc phn t mng, thit b u ni cho quang (OXC) l mt phn t chuyn mchquang linh hot cho php chuyn mch tn hiu ti t mt cng u vo n mt hoc nhiucng u ra khc nhau. Di gc mng, u ni cho l mt nt chuyn mch m trngthi thay i theo h thng qun l mng ch khng theo bo hiu trong mng.
Mtschcnngca OXChin nay
Chcnngchnh ca OXCs l khnngticu hnh mngmtcch linh hotmcbcsng cho khiphcmnghocthch ngivinhngthayinhu cubngtn.
Qun lbng tn v ktni cungcpktnicho cc knh thu ring (cho ccdchvthu bcsng) v ktnica cc knh quang(h trcho tiSDH), cungcpchcnng
xen/rbcsng,.. Sp xp hiu qu bc sng (grooming bc sng) tn dng tt hn c s h tng c. Pht trin cc dch v 10Gbit/s n 40Gbit/s, em li mt chi ph thp cho mng Bo v v khi phc mng mc bc sng. nh tuyn v lin kt mc bc sng.
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Ti liu ging dy cao hc kho 8
CC THIT B V THNH PHN QUANG T HP
Thitb OXCOXC chuynmchsi (FXC)
Cc ni cho chuynmchsi (FXC) thchinchuynmchttc knh bc sng
tmtsiu vo timtsiu ra, n hotngnhmtbngusitng.Trong mtsphnmng m vicbovchngtsi l vn chnh th FXC cth l mtgii php hp l. Chng tndng tia cc cng ngh quang hin ti.Chng c th cung cp cc khnng khi phc v d phng nginnhng li
khng linh hot(nhmhtr cc dchvbc sng im-immi).
1
2
12
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Ti liu ging dy cao hc kho 8
CC THIT B V THNH PHN QUANG T HP
Thitb OXCOXC lachnbc sng (WSXC)
WSXC chuynmchmt nhm cc knh bc sng tmtsiu vo nmtsiu ra. Vmtchcnng th chng yu cugii ghp (theo tns) cc tn hiunthnh bc sng ban uca chng. Loichuynmch ny c tnh linh hot cao
hn FXC, cho php d phng cc dchvbc sng, do vy c thhtr cc dchv video phn b,hct xa vv...
WSXC cn c tnh linh hot trong vic khi phcdchv. Cc knh bc sng cthcbov ring bitnhcchbov mesh, ring hockthp.
1
2
1
2
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u g g dy cao c o 8
CC THIT B V THNH PHN QUANG T HP
Thitb OXCOXC trao ibc sng (WIXC)
WIXC hon ton gingnh WSXC m t trn nhng c thm khnngchuynihoc thay itns(hocbc sng) ca knh ttns ny ntns khc.ctnh ny lm gim xc sut khng cnhtuyntsiu vo nsiu ra do
scnh tranh bc sng. WIXC c tnh linh hot cao nht trong vic khi phc vd phng dchv.
12
1
2
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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g g y
CC THIT B V THNH PHN QUANG T HP
Kin trc OXCOXC trao ibc sng (WIXC)
Kin trc chuynmch trong OXC c th thchin trn nhiu tngchuynmchkhng gian hoc lai ghp gia khng gian/bc sng.Ma trn vung NxN (a) c xy dng trn nhngkhichuynmchnhhn,slng phn t chuyn mch yu cu l N2 (thng l nhiu hn khc phcxuyn knh gia cc chuynmch, gy ra suy hao xen ln), c thmrng thnhktcuchuynmchln.Ktcuchuynmch NxN c thcto thnh t 2 tng Nx(1xN) chuynmch,lin kt qua N2 ktni quang. Gii php ny yu cumtslngphntchuynmch t hn so vigii php trc,nhnglitr nn cngknh khi N tng ln.
u ra
uvo
N/2xN/2#
1nx2n
#
mnx2n
#1mxm
#
m2nxm
#12nxn
#
m2nxn
1
r
1
r
#1
nx
#n
nx
#1
mx
#n
mx
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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g g y
CC THIT B V THNH PHN QUANG T HP
Mts cng nghchtophntchuynmch quang angc cc nhsnxut quan tm hin nay, l:
Chuynmch quang nhit
Chuynmch tinh thlng
Chuynmchkhuchi quang bn dn (SOA) Hthngcin quang siu nh (MOEMS)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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g g y
II. H THNG THNG TIN QUANG
1. H thng thng tin quang SDH
2. H thng thng tin quang s dng k thut khuch i quang v
ghp bc sng
3. H thng thng tin quang bin
4. Mng truyn ti quang th h sau (NGN)
5. H thng thng tin quang ni ht
6. Thit k cc h thng thng tin quang
NI DUNG CHNG TRNH HC
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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g g y
H THNG THNG TIN QUANG SDH
1. Phn loi cc giao din quang
ng dng Phmvi hp
Phm vi rng
C l ngn C l di
Bc sng danh nh(nm)
1310 1310 1550 1310 1550
Loi si G.652 G.652 G.652 G.652 G.652&G.654 G.653
Khong cch (km) 2 ~ 5 ~ 40 ~ 80
STM STM-1 I-1 S-1.1 S-1.2 L-1.1 L-1.2 L-1.3
STM-4 I-4 S-4.1 S-4.2 L-4.1 L-4.2 L-4.3
STM-16 I-16 S-16.1 S-16.2 L-16.1 L-16.2 L-16.3
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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g g y
H THNG THNG TIN QUANG SDH
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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g g y
H THNG THNG TIN QUANG SDH
2. Cc giao din quang STM-1, STM-4, STM-16.
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANG SDH
2. Cc giao din quang STM-1, STM-4, STM-16.
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANG SDH
2. Cc giao din quang STM-1, STM-4, STM-16.
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H THNG THNG TIN QUANG SDH
3. Cc tham s giao din quang1. Khi pht quang
Loi ngun pht: LED, MML, SLM
Ph ngun pht
Cng sut pht
T l phn bit
Mt n hnh mt2. ng truyn quang
Suy hao
Tn sc
Phn x
3. Khi thu quang
nhy thu
nhy thu qu ti
Gii ng nhy thu
Phn x
thit thi ng quang
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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CU HNH H THNG WDM
m bo kh nng phi hp hot ng trn ngi ta phi a ra cc khinim, nguyn tc v ch tiu c th cho tng hot ng ca cc phn tmng. Tp hp nhng thng s ny to nn tiu chun cho h thng.
Cu hnh chun nh ngha giao din quang ca h thng a knh
Cu hnh chun ca h thng WDM c xy dng trn cu hnh h thngSDH a knh quang im - im.
Tx1
Tx2
TxN
OM/
OAOA
Rx1
Rx2
RxN
OA/
ODM P I-S
R' S'M P I-R
f2
f1
f
S 1
S 2
S n
R M1
R M2
R
Mn
R 1
S D2
S Dn
SD1
R n
R 2
n
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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VN TIU CHUN HO CHO WDM
Cc cng u vo/ra c ch tiu giao din ng vi khuyn nghG.957/G.961/G.981 ca thit b SDH ph hp vi ch tiu cho cngu vo/ra ca thit b WDM. Gii php ny kinh t hn nhiu so vigii php tch hp chc nng chuyn i trong thit b WDM.
Kt ni gia phn t SDM v phn t WDM
SDH NE Transponder ONE
G.703
G.957
G.691
G.981
G.?
SDH Network Optical Network
SDH NETransponder
G.703
G.957
G.691
G.981
G.?
SDH Network
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VN TIU CHUN HO CHO WDM
Cc tiu chun ang c tip tc nghin cu cho cc hthng WDM hng ti mng quang Tiu chun G.692 ch c ng dng cho cc tuyn im - im.
hng ti mng quang cn phi c nhng tiu chun khc bao trmlnh vc mng quang. ITU-T a ra mt khung tiu chun cho vn chun ho mng quang.
G.onf- Khung cho mng quang G.otn- Kin trc mng quang
G.oef- Chc nng thit b
G.oni- M hnh thng tin
G.onm- Cc kha cnh qun l
G.ons- nh dng khung
G.onp- Lp vt l
G.onc- Cc phn t
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
1. Phn loi giao din quang1. H thng khng khuch i
2. H thng c khuch i
ng dng Khong cch ln(ti 80 km)
Khong cch rtln
(ti 120 km)
Khong cch ccln
(ti 160 km)
H thng 4 knh 4L-y.z 4V-y.z 4U-y.z
H thng 8 knh 8L-y.z 8V-y.z 8U-y.z
H thng 16 knh 16L-y.z 16V-y.z 16U-y.z
y = 4 hoc 16z = 2, 3 hoc 5
ng dng Khong cch ln
(mi on lp ti 80 km)
Khong cch rt ln
(mi on lp ti 120 km)
H thng 4 knh 4L5-y.z 4L8-y.z 4V3-y.z 4V5-y.z
H thng 8 knh 8L5-y.z 8L8-y.z 8V3-y.z 8V5-y.z
H thng 16 knh 16L5-y.z 16L8-y.z 16V3-y.z 16V5-y.z
y = 4 hoc 16z = 2, 3 hoc 5
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
2. Cc tham s giao din quang
1. Khi pht quang tng bc sng
Loi ngun pht
Ph ngun pht
Cng sut pht
T l phn bit Mt n hnh mt
Tn s tm
Khong cch gia cc knh
Sai lch tn s tm
2. ng truyn quang Suy hao
Tn sc
Phn x
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
2. Cc tham s giao din quang (tip)
3. Cc tham s b khuch i quang ng truyn
Bin thin khuch i a knh
dc khuch i a knh
Phn bit thay i khuch i a knh Cng sut nhn v pht ti a
Nhiu t pht
4. Khi thu quang
nhy thu
nhy thu qu ti Gii ng nhy thu
Phn x
thit thi ng quang
Gii bc sng thu
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
NORTEL Confidential NORTHERN TELECOMNORTHERN TELECOM
100 GHz Wavelength Plan100100 GHzGHz Wavelength PlanWavelength Plan
196.
1
1528.
77
195.
9
1530.
33
195.
7
1531.
90
195.
5
1533.
47
195.
1
1536.
61
194.
9
1538.
19
194.
7
1539.
77
194.
5
1541.
30
194.
3
1542.
90
194.
1
1544.
50
193.
9
1546.
10
193.
7
1547.
72
193.
5
1549.
32
193.
3
1550.
92
193.
1
1552.
52
192.
9
1554.
13
192.
7
1555.
75
192.
5
1557.
36
192.
3
1558.
98
192.
1
1560.
60
195.
3
1535.
04
ITU-T G.mcs
wavelength
grid
8-8-DenseDense
WDMWDM
PlanPlan
N-DSFN-DSF
&&
NZ-DSFNZ-DSF
16-16-
32-32-
Spares
200200 GHzGHz
PlanPlan16-16-
24-24-
OC-48 & OC-192
Wavelengths
V d v thit k cc bc sng
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
V d v thit k cc bc sngDWDM 8- :Blue : 1528.77nm, 1530.33nm, 1533.47nm, 1535.04nm
Red : 1550.92nm, 1552.52nm, 1555.75nm, 1557.36nm
DWDM 16- :Blue: 1531.90nm, 1536.61nm, 1538.19nm, 1539.77nmRed: 1547.72nm, 1549.32nm, 1554.13nm, 1558.98nm
DWDM 24- :Blue: 1529.55nm, 1531.12nm, 1532.68nm, 1534.25nm
Red: 1548.51nm, 1550.12nm, 1551.72nm, 1556.55nm
DWDM 32- :Blue: 1535.82nm, 1537.40nm, 1538.98nm, 1540.56nm
Red: 1553.33nm, 1554.94nm, 1558.17nm, 1559.79nm
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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H THNG THNG TIN QUANGS DNG KHUCH I QUANG V GHP BC SNG
V d v thit k cc bc sng
Ph u vo v u ra h thng 25 knhtruyn dn 1,500 km 40 Gb/s khong cch knh 100 GHz
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
1stGen : (Mng truyn dn quang)
Lung quang tnh im - im
2ndGen : (Mng truyn ti quang)Chuyn mch knh quang ng
3rdGen : (Mng gi quang)
Chuyn mch gi quang
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
Giao thc mng quang
IP
POS/POL
Point-to-pointWDM
optical Layer(virtual fiber)
IP
MPLS
Circuit-switchedWDM
Optical Layer(connection-oriented)
IP
Packet-switchedWDM
optical layer(connection-less)
Th h I Th h II Th h III
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
Sonet
SDH
Sonet
SDH
Voice, low-speed
data services
Voice, low-speed
data services
High speed
data servicesHigh speed
data services
DWDM
Sonet
SDHSonet
SDH
IP IP
Packet over SONET
OC-n
1stGen : (Mng truyn dn quang)
Lung quang tnh im - im
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
n m
Wavelength Routing NodeWavelength RouterFrequency Selective SwitchWavelength Changers...
ON-USER
LINK- SINGLE FIBER- FIBER BUNDLE
User-Network Interface
Mng nh tuyn theo bc sng tnh
1stGen : (Mng truyn ti quang)
Lung quang tnh im - im
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
2stGen : (Mng truyn dn quang)
Chuyn mch knh quang ng
Mng quang nh tuyn ng
Thit lp lung quang ng theo nhu cu Network Engineering Cn bng ti
Gim xc sut nghn
Khi phc mng
Kt ni gia mng IP v quang s dng cng ngh GMPLS
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
2stGen : (Mng truyn dn quang)
Chuyn mch knh quang ng
Ringnetwork
OADMOADM
DCS
OADM
OXC
Meshnetwork
DCS
OXC
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
2stGen : (Mng truyn dn quang)
Chuyn mch knh quang ng
OXCOADM OADM
OADM
t ransi t
DXC ATM
IP TDM
add/drop
pass-thru
pass-thru
pass-thru
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
3stGen : (Mng gi quang)
Chuyn mch gi quang
Chuyn mch Burst quang
Control Packet
control channel
data burst
Optical Burst Router
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
3stGen : (Mng gi quang)
Chuyn mch gi quang
Chuyn mch nhn quang
SignalSource
SignalDestination
Optical-labelswitchingIP/WDM
Node
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
Chuyn mch gi quang
SignalSource
SignalDestination
Routing tablelook up
Optical Packet Router
3stGen : (Mng gi quang)
Chuyn mch gi quang
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
M hnh chun giao thc Internet quang
UNI
UNI
SignalingIP/MPLS
RouterIP/MPLS
Router
CustomerIP/MPLSNetwork
Serviceagent
Manag,
Interfaceprotocol
Plane management
Layer management
Optical Layer
WDM Layer
IP/PPP Layer
Physical Layer
Ethernet /Link
IP
Control plane
NNI
Optical
Switch
Core Network
Service
agent
App Layer GMPLS
User plane Control plane
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
ATMHDLCEthernet MACRPR MAC
10GbE
LAN PHY
10GbE
WAN PHY
GFP
SONET / SDH
G.709 OCh digital wrapper/ optical channel
Optical fibre / G.652, G.653 etc.
IEEE 802.2 LLC PPP AAL5
GbE
PHY
IEEE 802.2 LLC
RPR PHY
IP
RPR = Resilient Packet Ring, IEEE 802.17; HDLC = High-level Data Link Control;
POS = Packet over SONET/SDH; GFP = Generic Framing Procedure (ANSI T1 X1 driven standard)
OTN = Optical Transport Network; WDM = Wavelength Division Multiplexing
WWDM = Wide WDM; DWDM = Dense WDM SDL : Simplified Data Link
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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S PHT TRIN CC TH H MNG QUANG WDM
IP ATM
ATM
Cell Based SDH
WDM
IP ATM
SDH VCnc
POS,SDL SDH
WDM
IP
Ethernet
GbE SDH
WDM
IP
MAPOS-SRP
SDH IP Based
WDM
ATM SDH Ethernet IP/WDM
IP ATM
ATM
Cell Based SDH
WDM
IP ATM
SDH VCnc
POS,SDL SDH
WDM
IP
Ethernet
GbE SDH
WDM
IP
MAPOS-SRP
SDH IP Based
WDM
ATM SDH Ethernet IP/WDM
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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MNG TRUY NHP QUANG
XU HNG PHT TRIN CNG NGH MNG TRUY NHP
Cng ngh trong mng truy nhp s pht trin trn mng truy nhp c nh hin
ti (cp ng v cp ng trc) cung cp bng tn truy nhp Internet cao hn
(tiu biu l xDSL).
Mng truyn ti quang (trn c s WDM) c m rng ra pha mng truy nhp.
Si quang ang thm nhp vo phn mng truy nhp tuy nhin c c FTTH
hay FTTD vn cha th tr thnh hin thc. T chng c th kt hp vi DSL
hoc cp ng trc n tn thu bao.
Ethernet v si quang s kt hp vi nhau cung cp bng tn khng gii hn
cho ngi s dng tuy nhin v mt gi c th vn l vn cha thc s r rng
Cng ngh truyn thng tin qua ng in dn dng. y l mt c hi ln tuy
nhin vn cn c nhiu thch thc v mt k thut cn vt qua.
Cc cng ngh trong mng truy nhp s h tr kh nng di ng: GPRS, UMTS,
WLAN, Bluetooth, v tinh. Ngoi ra cn b xung hnh thc truy nhp v tuyn c
nh, HFR .
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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MNG TRUY NHP QUANG
Cc loi khc
V tinhFWA
Quang
Kt hp quang
ng trc
DSL
ISDN
POTS
XU HNG PHT TRIN CNG NGH MNG TRUY NHP
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
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MNG TRUY NHP QUANG
S PHT TRIN MNG TRUY NHP QUANG
1,0
1,6
0,10,1
0,5
1,6
2,3
0,2
0,2
1,3
1,7
2,5
0,3
0,5
2,3
1,8
2,6
0,6
1,0
3,2
2,1
3,1
0,9
1,4
3,2
2,3
3,5
1,1
1,8
4,3
0,0
2,0
4,0
6,0
8,0
10,0
12,0
14,0
t
2002 2003 2004 2005 2006 2007
Th trng truy nhp quang th gii
NT (PON, FIBER.)
PON ONU
PON OLT
Fiber ONU
Fiber OLT
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MNG TRUY NHP QUANG
CU HNH THAM CHIU MNG TRUY NHP
TMN
Mng truy nhp
FTTx
xDSL
Mng chuyn mch
UNI
Giao din phakhch hng
Q3Q3
SNIGiao din
phatng i
Da trn hnh 1 trang 6 khuyn ngh G902
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
CU HNH THAM CHIU MNG TRUY NHP QUANG
T1520720-96
AN system management functions
ONU
ODN OLT
ONUAF
Service
node
functions
R/SS/R
(a) reference point
User side
Q3
Network side
(T) reference point
UNI
(V) reference point
SNI
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MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
CU HNH THAM CHIU KHI OLT
T1520750-96
ODN
interface
function
ODN
interface
function
OAMfunction
Power supplyfunction
Transmission
multiplex
function
Digital
crossconnect
function
Service
portfunction
NetworkODN
Core shell Service shell
Common shell
To mediation device
and then Q3 interface
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
CU HNH THAM CHIU KHI ONU
T1520740-96
User
portfunction
Customer
and
services
multiplex
function
Transmission
multiplexfunction
ODN
interfacefunction
ODN
Customer
Service shell
OAM
function
Power supply
function
Common shell
Core shell
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
CU HNH THAM CHIU NG TRUYN QUANG ODN
T1520770-96
hp : npm''p
mp = m'p + m"p
L
hj : nj
kp = k'p + k"p
k''p m'p k'p
Lp Lj Ll
mj kj
hl : nl
ml kl
R/S S/R
ONU OLT
Optical path
(j)-th
Optical path
elementConnector
Splice
Optical branching device
: : :
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
S PHT TRIN MNG TRUY NHP QUANG
T1528110-98
FTTCab
FTTHO
NT
NT
NT
ON
U
ONU
OL
T
FTTB/C
fibre
fibre
fibre
copper
copper
access network home
networkUNISNI
ONU Optical Network UnitONT Optical Network Termination
OLT Optical Line TerminationNT Network Termination
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
Service Node
SNI(VB5)
ONU
FTTH
FTTB
FTTC
FTTCab
Optical Fiber
x-PON xDSL
OLT
ONU NT
NT
Passive Optical Splitter
FTTx
FTTC:Fiber To The CurbFTTCab :Fiber To The Cabinet
FTTH :Fiber To The HomeFTTB :Fiber To The Building
Q3
OperationSystem
Internet
Leased Line
Frame/CellRelay
Telephone
InteractiveVideo
Twisted Pair
ONT
ONT
Service Node
SNI(VB5)
ONU
FTTH
FTTB
FTTC
FTTCab
Optical Fiber
x-PON xDSL
OLT
ONU NT
NT
Passive Optical Splitter
FTTx
FTTC:Fiber To The CurbFTTCab :Fiber To The Cabinet
FTTH :Fiber To The HomeFTTB :Fiber To The Building
Q3
OperationSystem
Internet
Leased Line
Frame/CellRelay
Telephone
InteractiveVideo
Twisted Pair
ONT
ONT
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MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
EMS
Hthngqun l
Mngquang
M ng vtuyn
Mng IP
M ng ATM
HthngOLT
ONU ONU
ONU
ONU
ONU
ONU
S i cung cp
S i phnb
B tch/ghp
PON
CO
Thoi vd liu
Tho i, d liu,v video
Thoi , d liu,v video
Thoi , d liu,v video
Cng tythng mi
M HNH MNG QUANG TH NG
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
PON1
PON2
PON 3
PSTN
concentrator
optics
control
Customers building
Link to lease line networks
Exchange site
Interface to customers
internet network
Optical splitters
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
CC CU HNH MNG QUANG TH NG
ONU1
OLT
ONU5
ONU4
ONU3
ONU2
OLT
ONU1
ONU2
ONU5
ONU3
ONU4
ONU1
OLT
ONU3 ONU4
ONU2
ONU5
ONU1
OLT
ONU5
ONU4
ONU3
ONU2
(a) Kin trc hnh cy (s dng b chia 1:N)
(b) Kin trc bus (s dng b ghp 1:2)
(c) Kin trc vng ring (s dng b ghp 2x2)
(d) K in trc hnh cy v i mt trung ktha(s dng b chia 2:N)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
SDH ring
SDH
ADM
SDHADM
SDH
ADM
switch H
D
T
ONU
ONU
ONU
ONUH
D
T
H
D
T
SDH
ADM
HDT = host digital terminal
ADM = add-drop mux
Copper pair
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
C c u cui xa:POTS, ISDN T1/E1,T3/E3, xDSL, V.35,...
Vng ring PON
Nh
cung cp(CO)OLT
u cui xa
ONU u cui
xa
ONU
u cui xa
ONU
u cui xa
ONU
PON im - a im
PON c trin khaithnh FTTB v FTTCtruyn tI cho DLC
Mi ONU nhn cc lung T1/E1,T3/E3, OC-3, hay OC-N t i/ tcc u cui DLC
Khitruy cp
ONU
u cui xa
OLT
Nh cungcp (CO)
Khitruy cp
ONU
Khitruy cp
ONU
Khi
truy cp
ONU
M n g PO Nim-a im
DLC
PON c tri n khaithnh FTTB v FTTClm u cui cho DLC
PON LM MNG TRUY CP CHO H THNG DLC
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
PON LM MNG TRUY CP CHO H THNG XDSL
SDH Tng i
VDSL
PON
FTTB
FTTB
FTTC VDSL
VDSL
FTTB
VDSLFTTC
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
PON LM MNG TRUY CP CHO H THNG XDSL
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
PON LM MNG TRUY CP CHO H THNG HFC
Cp TV
Hub
Hub
Hub
Hub
Nt s i
Cp ng trc
1:N
1:N
Cp ng trc
Cc nt s i
M ng PON
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
HRF l mt trong nhng cng ngh mi trong vi nm tr li y,
mcchca n l kthpbngtnrnglncasi quang vi tnh
linh hotca thitb truy nhp v tuyn. Cp quang s lm xng
sng trong mng truy nhp, giao tip v tuyn s c thc hin
trong mng phn b. Mc tiu cagii php ny l gimsphctpcathitbtitrm pht v tuyn,iu ny ngnghavivicgim
chi ph ut.
Hin nay HRF vn ang trong giai on nghin cu v chun ho.
Mts nh snxutthitb cho hng nhngsnphm ny tuy
nhin chng ch yu hot ng trn giao thc c quyn do d
nhiu nh khai thc cn e ngi khi trin khai chng trn mng.
H THNG LAI GHP SI QUANG V V TUYN (HFR )
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
CC H THNG V TUYN HIN NAY
H THNG LAI GHP SI QUANG V V TUYN (HFR)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
ng dng ca HRF
Truyn dn gia chuyn mch
Truyn dn gia BSC v BTS
Truyn dn gia BTS v RAU
H THNG LAI GHP SI QUANG V V TUYN (HFR )
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
KIN TRC TRUY NHP HFR TRONG NH
H THNG LAI GHP SI QUANG V V TUYN (HFR )
RAU
(a)
Siquang
Pico cellsradius
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MNG TRUY NHP QUANG
KIN TRC TRUY NHP HFR NGOI TRI
H THNG LAI GHP SI QUANG V V TUYN (HFR )
mm-wavetransmission
with star feeding
architecture
Headend - centralisedbase station optical fibre links
RAUs
mm-wave transmissionwith a distributedantenna architecture
RAU
(b)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
H THNG LAI GHP SI QUANG V V TUYN (HFR )
HFR PON
HFRHeadend
RAU
RAU
RAU
HFRHeadend
RAU
RAU
RAU
HFRHeadend
RAU
RAU
RAU
Mobile
Wireless
Terminals
Kt hp cu trc cy quangv sao v tuyn
Kt hp cu trc sao quangv v tuyn im-im
Kt hp cu trc sao quang v v tuyn t bo
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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MNG TRUY NHP QUANG
H THNG LAI GHP SI QUANG V V TUYN (HFR )
Trung tm Khi ngten u xa
(b) IF feeder (f around 1GHz)
Nt dch v EO
OE
NT IFRF
BBIF
Nt dch vE
OO
ENT BB
RF
(a) Baseband (BB) feeder
S KHI H THNG HFR CHO NG XUNG
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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G U QU G
S KHI H THNG HFR CHO NG XUNG
H THNG LAI GHP SI QUANG V V TUYN (HFR )
(c.3) Millimetre-wave Feeder (f > 10 GHz ) using state of the art
optical components
Nt dch vO
ENT
(c.2) Microwave Feeder (f < 10 GHz ), using conventional
optic-to-electric conversion at the RAU
Nt dch vE
ONT BB
RFO
E
BBRF
mm-Waveoptical source
(c.1) Microwave Feeder (f< 10 GHz) , using passive opticalconversion at the RAU
Nt dch v E ONT BB
RFEAM
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
7/29/2019 Tai Lieu TTQ GD CH Khoa 8 (Slide)
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Q
HFR c th tch hpcvinhnghthng v tuyn sau:
Truy nhp v tuyncnh: WLL, HIPERACCESS, LMDS.
Cc hthng di ng: GSM-900, DCS-1800, IS-95, WCDMA,
W-LAN trong nh: HIPERLAN 2, IEEE802.11.
Cc hthng truy nhpv tinh
H THNG LAI GHP SI QUANG V V TUYN (HFR )
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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Vmt cng ngh, cc ngdng cho HFR c xc nhcth sau khi phn
tch khnngngdng v chi ph tngi khi trin khai cc ngdng nay:
Cng ngh DFB ph hp cho ngdng GSM/DCS 1800 cho mi trngngoi
thnh
Cng ngh OSB ph hpvingdng LMDS cho mi trng thnh th
Cng ngh CPEAM ph hpvingdng UMTS cho vng microcell
Cng ngh LPEAM ph hpvic UMTS v DCS 1800 cho mi trngngoi
thnh
Ngoi ra c ththyrng HFR khng ph hp cho trin khai cc ngdng
WLAN
H THNG LAI GHP SI QUANG V V TUYN (HFR )
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
7/29/2019 Tai Lieu TTQ GD CH Khoa 8 (Slide)
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H THNG ATM-PON
OLT ODNb1 b2 ... bn
ONU1
ONUn
b1 b2 ... bn
b1 b2 ... bn
Phn b ONU
OLT ODNONU1
ONU1
ONUn
ONU2 .... ONUn
ONU1 ONU1
ONUn ONUn
Tp trung ONU
....
....
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
7/29/2019 Tai Lieu TTQ GD CH Khoa 8 (Slide)
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H THNG ETHERNET-PON
OLT ONU2
ONU1
ONU3
USER1
USER2
USER3
1 1
2
3
header Payload FCS
Khung 802.3 33
1
1
2
33
3
3 3 31 1 2
Khung 802.3
Khe thi gian
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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H THNG TDM-PON & WDM-PON
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
MNG TRUY NHP QUANG
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IP
Ethernet AAL5
ATM
Ethernet
PHY PHY
ATM
PPP
xDSL xDSLSONET/
SDHSONET/
SDH
ATM
AAL5
PPP
IP
ATM,Framerelay,etc.
PHY
Cat5 Copper Fiber
Ethernet
PHY PHY
Ethernet
xDSL xDSL PHY PHY
Ethernet
IP
ATM, FR,etc.
PHY
Cat5 Copper Fiber
Ethernet
IP
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
QUY TRNH THIT K TUYN WDM
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Xc nh loi si v phng php b tn sc
Xc nh di v khong cch cc on lp ca h thng.
Cc qu v ca s hot ng
d phng
Yu cu v cht lng BER V tr lp t thit b
Kim tra di ca s hot ng m bo phng php b tn
sc ph hp.
Kim tra gii hn suy hao Nu c OADM, kim tra ca s v suy hao ca tt c cc tuyn
ph
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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Xc nh rng v khong cch ca cc knh bc sng
n nh bc sng ca cc thit b nhy cm vi bc sng
Lin kt b lc trong cc chui lin tip cc b lc
Kim sot cc hiu ng phi tuyn
Kim sot tn sc Kim sot xuyn m
Di ng ca cc b khuch i quang
iu khin nhiu h thng (c bit l ASE)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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Xc nh rng v khong cch ca cc knh bc sng ph
thuc vo nhiu yu t:
gin rng tn hiu do iu ch, chirp laser v s tri bc sng,
chnh xc ca b lc.
Suy hao Xuyn knh (do cc b lc, do cc hiu ng phi tuyn v.v...)
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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S knh ca WDM ph thuc vo
Khong cch gia cc knh () Gii ph b khuch i
rng ph ca ngun
Tc mi knh quang
Tn sc si
Di tch v ghp knh
-+=
211N
V d: 1540 nm ti 1560 nm v khong cch gia cc knh l 1.6 nm (200 GHz)=> 12.5 channels
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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n nh bc sng ca cc thit b nhy cm vi bc sng
C l vn ln nht trong truyn dn WDM l phi m bo sao cho knh (bc
sng) trong h thng l nh nhau khi truyn t u n cui h thng. Khi chng
ta truyn mt knh no nht nh phi m bo n c truyn trn bc sng
nh vi mt dung sai h thng cho php.
Cc vn lin quan n n nh bc sng:
iu khin nhit
Chirp laser v s dao ng hi phc
S tri bc sng laser
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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Kim sot cc hiu ng phi tuyn
Kim sot tn sc Kim sot tn sc trong cc h thng WDM rt ging trong h thng n
knh. Tuy nhin, c mtsim khc:
Vicsdngsi tn scdchchuyn l khng hiuqu do lin quan n cchiungtrnbn sng FWM.
B tn sc dng si DCF phicthchinrtcnthn cn bng ccc tnh tn scca cc si phn bc sao cho tn scbng khng trn tonbdi cc bc sng ckhuchi.iu ny rt kh thchin.
Khi sdng cch t Bragg si,thct ta cnmtdchtnsrtlnb tn sc trn ton bdibc sng. Cc cch t c dchtnslnrtkh chto. Cc cch t FBG mua ra mtgii php cho vn ny. Ta
cng c th c loi FBG dchtns ring bit b tn sc cho tng knhrinh bit. Tuy nhin, trong trnghp ny ta phigi cc knh c khongcch sao cho cc sn xung ca b lc khng giao thoa vi tn hiu cabng bn cnh.
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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Cc vn v khuch i Cc c tnh quan trng nht ca b khuch i l h s khuch i, u ra
cng sut, v gii hn ca cc bc sng c khuch i (trong cc hthng WDM). iu quan trng l phi chn c b khuch i c cc ctnh thch hp a vo ng dng.
Vng bc sng khuch i t nhin ca mt b khuch i EDFA ngin l khong 1535 1560 nm. Vng ny c th m rng bng cch s
dng kt hp cc cht pha tp v cc b khuch i vi di khuch i 40nm.
Khi s dng cc b EDFA trong cc tuyn truyn dn cn phi xt nnhng yu t sau:
Tnh phi tuyn ng ca h s khuch i
S pht sinh nhng bin i cng sut t ngt
Tp gy ra do b khuch i. Cc hiu nh ph thuc s phn cc.
Trong cc vn trn th ba vn u l cc hiu ng quan trngnhng vn th t l khng ng k tr phi trong trng hp cc hthng c s lng b khuch i ln.
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
CC YU CU TRONG THIT K H THNG WDM
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Nhiu trong cc h thng WDM
Nhiu Laser
Nhiu b ghp
Truyn dn trn si
Tng tc h thng
Nhiu b khuch i (ASE)
Nhiu b tch knh
Nhiu b thu
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
TNH TON QU CNG SUT
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Cn quan tm ti: Mo v nhiu xung
Cng sut cao: Mo tn hiu
Cng sut thp: T l tn hiu trn nhiu thp
Hiu sut h thng(dBQ)
Cng sut pht (dBm)
Gii hn nhiutuyn tnh h thng
H thng bao gm nhiu phi tuyn
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
Q H THNG
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S dng Q thay th cho BER:
Q l phn tuyn tnh ca on cui nhiu Gaussian theoBER = 1/2erfc(Q/2)
0
1
s0
s
1
RefD
RefD
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
BIU HNH MT
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Mt biu hnh mt ch mt mu bt 0 biu din trong mtkhe thi gian
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
ld)NGOI SUY Q H THNG
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Above Q = 6 it is useful to extrapolate to obtain Q
Assumes Gaussian noise
At optimum performance (max. Q) BER0 = BER1
Vth = decision level for pulse recovery process
1
0
s0
s
1
Th
xxxxx
QVth
(decision
voltage
threshol
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
C LNG HIU SUT QUANG
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Qu cho Q h thng:
Q l h s cht lng h thng
Bit error rate (BER) l hm ca Q
c th thy rng Q > Qo X Dwc
Qol Q h thng khng c mo Qoch i din cho nhiu
Dwcl ch s mo trng hp ti nht is the worst case distortion
factor
nh hng ca nhiu v mo l hai qu tch bit
Q h thng l tp hp t cc qu ny
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
NHIU V MO TN HIU
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H thng gim cht lng c chia lm 2 nhmA) nh hng do mo:
Mo pha thuMo pha phtMo ng truyn quang:tn sc, SPM,FWM & XPM 4 knh
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
H THNG QUANG C KHUCH I
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Q Dwc QoQ=7 EOL
< 1
P1
A
BP0
0
1
0
s0
s1
+
Noise-only Q > 7
Hc vin Cng ngh BCVTTi liu ging dy cao hc kho 8
TRUYN DN: NHIU + MO
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Mt quang ti u pht