Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7...
Transcript of Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7...
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Curs 5
2020/2021
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2C/1L Optoelectronică OPTO Minim 7 prezente curs + laborator Curs - conf. Radu Damian ◦ an IV μE ◦ Miercuri 11-14, online, Microsoft Teams ◦ E – 70% din nota (50+20), online, rf-opto 20% test la curs, saptamana 4-5?
◦ probleme + (? 1 subiect teorie) + (2p prez. curs) ◦ toate materialele permise
Laborator – sl. Daniel Matasaru ◦ an IV μE
Marti 10-14 impar/par
◦ L – 30% din nota (+Caiet de laborator)
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Curs ◦ Miercuri 11-14, online
◦ 2C 3C
14*2/3 ≈ 9.33
9÷10 C ≈ 9C + E
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acces la examene necesita parola primita prin email
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acces email/parola
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primita prin email
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Aplicatia de examen online utilizata intens la: ◦ curs (prezenta)
◦ miniteste
◦ examen
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intotdeauna contratimp ◦ perioada lunga (prezenta curs/rezultate laborator)
◦ perioada scurta (teste: 15min, examen: 2h)
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Capitolul 1
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Comunicatii ◦ Infrarosu (InGaAsP)
Vizibil ◦ Spectru vizibil (GaAlAs)
Iluminare ◦ Putere ridicata, lumina alba (GaInN)
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Infrarosu Apropiat
Frecvenţă
Lungime de undă 1.6
229
1.0 0.8 µm 0.6 0.4 1.8 1.4
UV
(vid)
1.2
THz 193 461
0.2
353
Longhaul Telecom Regional Telecom Local Area Networks
850 nm
1550 nm
1310 nm
CD Player 780 nm
Laseri HeNe 633 nm
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850nm, 1310nm, 1550nm
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Capitolul 4
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Lumina ca undă electromagnetică (ecuaţiile lui Maxwell, ecuaţia undelor, parametrii de propagare)
Elemente de fotometrie şi radiometrie (mărimi energetice/luminoase) Fibra optică (realizare, principiu de funcţionare, atenuare, dispersie,
banda de frecvenţă) Cabluri optice (tehnologie, conectori, lipire - splice) Proiectare sistemică a legăturii pe fibra optică (bandă de frecvenţă,
balanţa puterilor) Emiţătoare optice (LED şi dioda laser - realizare fizică şi functionare) Receptoare optice (dioda PIN, dioda cu avalanşă - realizare fizică şi
functionare) Amplificatoare transimpedanţă (parametri, scheme tipice, TIA în buclă
deschisă, cu reacţie, diferenţiale, control automat al câştigului) Realizarea circuitelor pentru controlul emiţătoarelor optice (parametri,
scheme tipice, controlul puterii, multiplexoare) Dispozitive de captare a energiei solare (principiu de functionare,
utilizare, proiectare )
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un ghid de unda dielectric ◦ miez
◦ teaca
Optical fibers
Tube
Strain relief (e.g., Kevlar)
Inner jacket
Sheath
Outer jacket
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Unghi de acceptanta
Apertura numerica
cACC nn sinsin 20
2
1
2
22
2
2
1
2
22 nn
n
nnnNA
ACCnNA sin0
n2 – miez n1 – teaca n2 > n1 !!
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Monomod
Multimod ◦ cu salt de indice
◦ cu indice gradat
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50/125 sau 62.5/125 (μm)
15-50 MHz· km
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50/125 sau 62.5/125 (μm)
700-1200 MHz·km
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g = 1 – indice gradat triunghiular
g = 2 – indice gradat parabolic
g = ∞ - salt de indice
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6-8/125 (μm)
MHz·km nerelevant
MFD – Mode Field Diameter
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Ecuatiile lui Maxwell in coordonate cilindrice
a - raza miezului U - E(r) sau H(r)
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solutii proportionale cu functii Bessel
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Moduri in ghid rectangular
Moduri linear polarizate in fibra
“Sparkle” pattern
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Frecventa normalizata
Numar de moduri
NAakNAa
V
2
22
2
g
gVN
L
mL
a - raza miezului
2k
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Fibre monomod
NAa
NAV
a
C
C405.2
22
Exemplu:
2a = 8.5μm
NA = 0.11
nm121011.0405.2
5.8C
405.2 CVV
exista un singur mod (solutii fc. Bessel)
b – coeficient de propagare modal relativ
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Numar de moduri ◦ Multimod cu salt de indice
◦ Multimod cu indice gradat
◦ Monomod
2
2VNg
42
2VNg
405.2 CVV exista un singur mod (solutii fc. Bessel)
22
2
g
gVN
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fibra tipica multimod ◦ g=2
◦ 2a = 50μm -> a = 25μm
◦ NA = 0.2 la λ = 1μm
4.31522.01
2522
NA
aV
2474
4.31
42
22
V
Ng
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Propagarea luminii poate fi explicata doar prin teoria electromagnetica
Energia campului se extinde in teaca (diametrul efectiv al spotului luminos – MFD, Mode Field Diameter)
MFD > 2a Adancimea de patrundere in teaca
depinde de lungimea de unda, generand dispersia de ghid
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d
Through the Wormhole S02E07 How Does the Universe Work
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Cat de departe pot transmite semnalul luminos pe fibra ◦ atenuare
Cat de rapid pot transmite informația ◦ dispersie
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0 dBm = 1 mW 3 dBm = 2 mW 5 dBm = 3 mW 10 dBm = 10 mW 20 dBm = 100 mW -3 dBm = 0.5 mW -10 dBm = 100 W -30 dBm = 1 W -60 dBm = 1 nW
0 dB = 1 + 0.1 dB = 1.023 (+2.3%) + 3 dB = 2 + 5 dB = 3 + 10 dB = 10 -3 dB = 0.5 -10 dB = 0.1 -20 dB = 0.01 -30 dB = 0.001
dB = 10 • log10 (P2 / P1) dBm = 10 • log10 (P / 1 mW)
[dBm] + [dB] = [dBm] [dBm/Hz] + [dB] = [dBm/Hz]
[x] + [dB] = [x]
in
out
P
P10log10dBPierderi
mW
P
P
P
1log10log10dBmP 10
0
10
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in
out
P
PPierderi
in
out
P
P10log10dBPierderi
]lungime[km
B]Pierderi[ddB/kmAtenuare
dBmdBmdBPierderi inout PP
√
0
10
0
100
0
10 loglog10log10dBPierderiP
P
P
P
P
P
P
P inout
in
out
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Macrocurburi ◦ utilizator, localizat, dB
Discontinuitate in fibra ◦ utilizator, localizat, dB
Microcurburi ◦ distribuit, tehnologie, dB/km
Imprastiere ◦ distribuit, tehnologie, dB/km
Absorbtie ◦ distribuit, material, dB/km
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utilizator, localizat, dB
i
iAA
iANA
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Multimod
Monomod v creste n scade
v scade n creste
2,1 nnRR extC
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Apare cand nu putem considera fibra un singur ghid dielectric ◦ defectiuni
◦ conectori
utilizator, localizat, dB
i
iAA
iANA
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distribuit, tehnologie, dB/km
LAA i
kmLkmdBAdBA i /
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distribuit, tehnologie, dB/km
LAA i
kmLkmdBAdBA i /
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distribuit, material, dB/km
kmLkmdBAdBA i /
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imprastierea luminii (si a altor radiatii electromagnetice) de particule (molecule) mult mai mici decat lungimea de unda
4
1~
A
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Absorbtie ◦ 950nm
◦ 1244nm
◦ 1383nm
Apa!
![Page 44: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/44.jpg)
111
ztjzy eeCtzE
2~, EPW
222
ztjzy eeCtzE
12
1
22
22
22
1
2 zz
z
z
eeCt
eCt
P
PA
12210
1
210 log10log10][
zze
P
PdBA
121012 686.8log20][ zzezzdBA
0686.8]/[/ kmdBLA
Atenuarea se exprima de obicei in dB/km
de obicei valori pozitive
semnul = implicit
![Page 45: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/45.jpg)
in
out
P
PPierderi
in
out
P
P10log10dBPierderi
]lungime[km
B]Pierderi[ddB/kmAtenuare
dBmdBmdBPierderi inout PP
√
![Page 46: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/46.jpg)
Stimulated Brillouin Scattering, SBC ◦ difractia luminii inspre emitator datorita undelor
mecano-acustice generate in fibra ◦ 6-10 dBm
Stimulated Raman Scattering, SRS ◦ interactiunea luminii cu vibratiile moleculare ◦ 27 dBm (~1W)
Self Phase Modulation, SPM ◦ Frontiera impulsului implica indice de refractie variabil in
timp moduland faza impulsului ◦ 5 dBm ◦ Cross Phase Modulation, CPM
Four-Wave Mixing, FWM ◦ 0 dBm
![Page 47: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/47.jpg)
![Page 48: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/48.jpg)
23
2
1NNNL
N = 2, NL = 4
N = 3, NL = 9
N = 16, NL = 1920
![Page 49: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/49.jpg)
Cat de departe pot transmite semnalul luminos pe fibra ◦ atenuare
Cat de rapid pot transmite informația ◦ dispersie
![Page 50: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/50.jpg)
Propagarea cu viteze diferite a radiatiilor cu trasee/lungimi de unda diferite ◦ intermodala (modala – depinde de prezenta
modurilor)
◦ intramodala (cromatica – depinde de lungimea de unda)
de material
de ghid
![Page 51: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/51.jpg)
![Page 52: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/52.jpg)
v
Lt 0
C
Cv
Lt
cos
2n
cv NAC cos
2
1220
n
nn
c
nLttt CSI
c
nLttt CSI
20
11
12
n
nn 2
2
02
NAnc
Lttt CSI
dttSI
![Page 53: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/53.jpg)
salt de indice
indice gradat
2
2
2
12
1
2
2
2 nc
NAL
n
nn
nc
nLdt
intarzierea intre
moduri cand 1
1
12
n
nn
2
2
mod23
1
dt
2
2
2mod
3432 nc
NAL
c
nL
3
2
42
2
82 nc
NAL
c
nLdt
c
nL
34
2
2mod
12.01.0 NAn2 – miez n1 – teaca n2 > n1 !!
![Page 54: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/54.jpg)
Mai mare la fibre multimod cu salt de indice
Mai mica la fibre multimod cu indice gradat ◦ traseele mai lungi trec prin zone cu indice mai mic
Inexistenta la fibrele monomod
![Page 55: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/55.jpg)
d
dnnngr
2
2
d
nd
c
Lmat
SiO2
![Page 56: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/56.jpg)
Neglijabila in fibrele multimod fata de dispersia modala
2
2
dV
VbdV
c
Lngh
b – constanta de propagare normalizata
405.2 CVV
![Page 57: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/57.jpg)
Variatie aproximativ liniara
Caracterizata de panta si punctul de trecere prin 0
![Page 58: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/58.jpg)
D(λ) ≈ 100 + 0.4 (850 - λ) [ps/nm/km] pentru 800 < λ < 900 nm
D(λ) ≤ 3,5 ps/nm/km pentru 1285 < λ < 1330 nm
D(λ) ≤ 17 ps/nm/km pentru 1525 < λ < 1575 nm
LDcr
3
400 -
4
S=)D(
3
400 -
4
S=)D(
S0 panta dispersiei – ps/nm2/km
0=)D( 0
![Page 59: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/59.jpg)
LDcr
![Page 60: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/60.jpg)
degenerarea nivelelor energetice duce la aparitia benzilor energetice
Multitudinea de tranzitii posibile intre cate doua nivele situate in benzi energetice diferite duce la largirea caracteristicii spectrale a surselor
2,
2000
0
Δ
![Page 61: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/61.jpg)
nm002.0
![Page 62: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/62.jpg)
A
A
A
3⋅A
t
t
t
t
A1
A2
A3
A1+A2+A3
t
t
t
t
T
T
T
T
T0
T0+Δτ12
T0+Δτ13
T0
T0+T
T0+Δτ12+T
T0+Δτ13+T
T0+Δτ13+T
Δτ =Δτ13
m1,v1
m2,v2
m3,v3
v1> v2> v3
Impartire energie pe moduri Recombinarea
energiei modurilor
Transmisie cu viteze diferite v1> v2> v3
degtf tj
Conceptual
![Page 63: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/63.jpg)
A
A
A
3⋅A
t
t
t
t
A1
A2
A3
A1+A2+A3
t
t
t
t
T
T
T
T
T0
T0+Δτ12
T0+Δτ13
T0
T0+T
T0+Δτ12+T
T0+Δτ13+T
T0+Δτ13+T
Δτ =Δτ13
1,v1
2,v2
3,v3
v1> v2> v3
Impartire energie pe lungimi de unda Recombinarea
energiei la diferite lungimi de unda
Transmisie cu viteze diferite v1> v2> v3
degtf tj
Efectiv
![Page 64: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/64.jpg)
transmisii cu viteze diferite
LDcr
![Page 65: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/65.jpg)
1550nm Efectul sursei ◦ fibra monomod cu dispersia 16ps/nm/km@1550 ◦ latimea spectrala a sursei Δλ=1nm ◦ 50km
LDcr
pspscr 80050116
100<400<800<1600
pskmnmkmnm
pscr
LDcr
![Page 66: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/66.jpg)
1550nm Efectul sursei ◦ fibra monomod cu dispersia 16ps/nm/km@1550 ◦ latimea spectrala a sursei Δλ=0.1nm ◦ 50km
LDcr
pspscr 80501.016
100≈80<400<1600
pskmnmkmnm
pscr
LDcr
![Page 67: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/67.jpg)
Efectul fibrei ◦ fibra cu dipersie deplasata: 4ps/nm/km@1550 ◦ latimea spectrala a sursei Δλ=0.1nm ◦ 50km
LDcr
pspscr 20501.04
20<100<400<1600
pskmnmkmnm
pscr
LDcr
![Page 68: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/68.jpg)
Efectul fibrei ◦ fibra cu dipersie deplasata: 4ps/nm/km@1550 ◦ latimea spectrala a sursei Δλ=0.1nm ◦ 150km
LDcr
pspscr 601501.04
60<100<400<1600
pskmnmkmnm
pscr
LDcr
![Page 69: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/69.jpg)
efecte succesive se adună liniar
efecte simultane se adună pătratic
21 tot
2
mod
2 crtot
1 2
cr ,mod
![Page 70: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/70.jpg)
Dispersia modala
salt de indice
indice gradat
2
2
2mod
3432 nc
NAL
c
nL
32
422
mod31634 nc
NAL
c
nL
Dispersia cromatica
12.01.0 NA
102.001.0
LDcr
3
400 -
4
S=)D(
2
mod
2 crtot
0
Δ
![Page 71: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/71.jpg)
Dispersia totala
Banda
Banda optica la 3 dB corespunde unei benzi electrice la 6 dB ◦
Viteza legaturii
2
mod
2 crtot
GHz
nsB
tot
opt
44.0
elopt BB 2
GHzBsGbV el 2/
2~;~ IPIP elopt
21 totsau
![Page 72: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/72.jpg)
LDcr
2
2
2mod
3432 nc
NAL
c
nL
2
mod
2 crtot
GHz
nsB
tot
opt
44.0
elopt BB 2 elBsGbV 2/
Lconsttot
L
constsGbV /
constkmLsGbV ][/
![Page 73: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/73.jpg)
L~mod Lcr ~ Ltot ~
][
1~
1~~/
kmLGHzBsGbV
tot
el
.ct][/ kmLsGbV
.ct][ kmLMHzBel
![Page 74: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/74.jpg)
Sticla are (nativ) dispersie cromatica 0 la 1310nm
Atenuarea e mai mica la 1550 nm
EDFAŸ (Erbium doped fibre amplifiers) opereaza in banda 1550nm
Sistemele WDM (Wavelength division Multiplexing) necestia banda larga amplificata
![Page 75: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/75.jpg)
FWM
![Page 76: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/76.jpg)
![Page 77: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/77.jpg)
Dispersie: -100 ps/nm/km
Atenuare 0.5 dB/km
![Page 78: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/78.jpg)
3
400 -
4
S=)D(
![Page 79: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/79.jpg)
3
400 -
4
S=)D(
+
![Page 80: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/80.jpg)
Diametru teaca = 125 μm
MFD = 9÷10 μm la 1300 nm
λC = 1100÷1280 nm Pierderi de curbura (la 1550 nm) mai mici de 1 dB
pentru 100 spire de fibra rulata pe un mosor cu 7.5 cm diametru
Dispersia in banda 1300 nm (1285-1330 nm) mai mica de 3.5 ps/nm/km. La 1550 nm dispersia trebuie sa fie mai mica de 20 ps/nm/km
Viteza de variatie a dispersiei (panta dispersiei S0) mai mica de 0.095 ps/nm2/km
ITU (International Telecommunication Union) is the United Nations specialized agency for information and communication technologies – ICTs
![Page 81: Curs 5 2020/2021rf-opto.etc.tuiasi.ro/docs/files/Curs_5_OPTO_2021.pdf · 2021. 3. 24. · Minim 7 prezente curs + laborator Curs - conf. Radu Damian an IV μE Miercuri 11-14, online,](https://reader035.fdocument.pub/reader035/viewer/2022071608/6145ac0507bb162e665fd613/html5/thumbnails/81.jpg)
Atenuare 180 dB/km NA = 0.3 Diametru 1 mm Banda 125MHz (100m)