Trang1 MC LC

MC LC ...................................................................................................................... 1 DANH SCH HNH V................................................................................................. 5 Chng 1. CU TRC MNG CP QUANG THU BAO FTTx................................. 8 1.CU TRC MNG CP QUANG THU BAO FTTX........................................... 8 1.1.T quang phi cp 1: ........................................................................................................ 8 1.2.T quang phi cp 2: ........................................................................................................ 8 1.3.Tp im quang: ............................................................................................................... 8 1.4.B chia (Splitter): ............................................................................................................. 9 2.TCHC QUN L CC THNH PHNCUTRCMNGCPQUANG FTTx......................................................................................................................... 9 3.T CHC VNG PHC V .................................................................................. 9 4.CU TRC U NI C BN ............................................................................10 4.1.Cu trc u ni ti t phi quang cp 1.......................................................................... 10 4.2.Cu trc u ni ti t phi quang cp 2.......................................................................... 10 4.3.Cu trc u ni ti tp im........................................................................................... 10 5.MTTNGQUANTNHNNGKTHUTCACCVTTMNG QUANG GPON:......................................................................................................11 Chng 2. TIU CHUN K THUT CP QUANG..................................................12 1.CP SI QUANG...................................................................................................12 1.1.Gii thiu chung ............................................................................................................. 12 1.2.Tiu chun k thut......................................................................................................... 12 1.2.1.Tiu chun v cht lng truyn dn ca si quang............................................... 12 1.2.2.Tiu chun chung v cc c tnh c hc ca si cp quang .................................. 16 1.2.3.Yu cu chung v cu trc ca si cp quang........................................................ 18 2.DY NHY QUANG (JUMPER CORD) ...............................................................24 2.1.Gii thiu chung ............................................................................................................. 24 2.2.Tiu chun k thut......................................................................................................... 24 3.DY PIGTAIL ........................................................................................................25 3.1.Gii thiu chung ............................................................................................................. 25 3.2.Tiu chun k thut......................................................................................................... 25 4.GI U CP QUANG TRONG NH ODF.........................................................26 4.1.Gii thiu chung ............................................................................................................. 26 4.2.Tiu chun k thut......................................................................................................... 27 5.T U NI CP QUANG NGOI TRI ...........................................................29 5.1.Gii thiu chung ............................................................................................................. 29 5.2.Tiu chun k thut......................................................................................................... 29 6.MNG SNG CP QUANG..................................................................................31 6.1.Gii thiu chung ............................................................................................................. 31 6.2.Tiu chun k thut......................................................................................................... 32 7.U NI QUANG (OPTICAL CONNECTOR) .....................................................32 7.1.Gii thiu chung ............................................................................................................. 32 Trang2 7.2.Tiu chun k thut......................................................................................................... 32 7.2.1.Dng hnh hc ca phn tip xc ca u ni (end face finish): ............................. 32 7.2.2.Yu cu k thut truyn dn cho cc loi u ni .................................................. 33 8.BTCHGHPQUANG(Splitter/CombinerhayOpticalNon-Wavelength Selective Splitter/Combiner)....................................................................................35 8.1.Gii thiu chung ............................................................................................................. 35 8.2.Tiu chun k thut (ch p dng cho b tch/ghp cng sut quang Optical Non-Wavelength Selective Splitter/Combiner)............................................................................... 35 8.2.1.V mt cng ngh ch to ..................................................................................... 36 8.2.2.V c tnh truyn dn .......................................................................................... 36 Chng 3. K THUT THI CNG CP QUANG.......................................................38 1.NGUYN CU H S BN V THI CNG........................................................38 1.1.Phm vi thit k .............................................................................................................. 38 1.2.Phng n thit k .......................................................................................................... 38 1.3.Vt t ch yu s dng trong cng trnh.......................................................................... 38 1.4.Cc yu cu v t chc thi cng...................................................................................... 39 2.KHO ST O T LI TRC KHI THI CNG.............................................39 2.1.Kho st o c tuyn cp treo........................................................................................ 39 2.2.Kho st o c tuyn cp ngm..................................................................................... 39 2.3.Kho st o c tuyn cp chn trc tip ........................................................................ 40 2.4.Kho st o c v tr lp thit b u cui....................................................................... 40 3.LP PHNG N TIN THI CNG..............................................................40 3.1.Phng n, tin thi cng tuyn cp treo...................................................................... 40 3.2.Phng n thi cng tuyn cp ngm................................................................................ 40 3.3.Phng n thi cng tuyn cp chn trc tip : ................................................................. 41 4.THI CNG TH CP.............................................................................................41 4.1.Thi cng cp th cng : ................................................................................................... 41 4.1.1.Chun b vt t, phng tin, dng c thi cng : ................................................... 41 4.1.2.Th t hp 03 ng 34 vo trong ng pi 110 : ................................................. 41 4.2.Lun dy ti vo lng ng: ............................................................................................. 43 4.2.1.Ko cp vo ng ................................................................................................... 44 4.2.2.Gia c bo v cp.................................................................................................. 46 4.3.Thi cng cp treo............................................................................................................ 46 4.3.1.Chun b vt t, phng tin, dng c thi cng ..................................................... 46 4.3.2.Th cp quang treo................................................................................................ 47 4.3.3.Bo hiu bo v cp .............................................................................................. 48 4.4.Thi cng cp chn trc tip :........................................................................................... 48 4.4.1.Chun b vt t, phng tin, dng c thi cng : ................................................... 49 4.4.2.Th cp quang chn trc tip : .............................................................................. 49 5.KIM TRA NGHIM THU.....................................................................................51 6.LP H S HON CNG.....................................................................................51 Chng 4.AN TON LAO NG TRONG QU TRNH THI CNG CP QUANG52 1.QUYNHATLKHITHICNGCPQUANGTRONGHTHNGHM CNG CP: ............................................................................................................52 1.1.Cc quy nh an ton cho ngi: ..................................................................................... 52 1.2.Cc quy nh an ton cho vt t: ..................................................................................... 53 2.QUY NH ATL KHI THI CNG CP QUANG TREO:....................................53 2.1.Cc quy nh an ton cho ngi: ..................................................................................... 53 2.2.Cc quy nh an ton cho vt t: ..................................................................................... 54 Trang3 3.QUY NH ATL IN KHI THI CNG CP QUANG NGM, TREO:............56 3.1.Khi nim c bn v an ton in: .................................................................................. 56 Chng 5. K THUT HN NI SI QUANG ..........................................................58 1.MC CH: ............................................................................................................58 2.GII THIU MT S DNG C THI CNG HN NI CP QUANG:.............58 2.1.Dng c ct dc si cp: ................................................................................................. 58 2.2.Dng c tut ng m..................................................................................................... 59 2.3.Dng c tut lp v bc si quang:................................................................................. 59 2.4.Dng c ct si quang:.................................................................................................... 60 3.GII THIU MT S PHNG PHP HN NI CP QUANG: ......................61 3.1.Ni kt dnh c kh: ........................................................................................................ 62 4.VT T PH KIN TRONG HN NI CP SI QUANG.................................63 4.1.Mng sng ni cp quang ............................................................................................... 63 4.1.1.Mng sng UCAO: ............................................................................................... 63 4.1.2.Mng sng UCNP: ................................................................................................ 63 4.2.ODF: .............................................................................................................................. 64 4.2.1.FO12-WSC........................................................................................................... 64 4.2.2.FO24-WSCM........................................................................................................ 64 4.3.Khay cha mi ni:......................................................................................................... 64 4.4.Lc gi mi ni: ........................................................................................................... 65 4.5.ng co nhit bo v mi ni: .......................................................................................... 65 4.6.Cabinet phn phi, t cp v tp im quang: ................................................................. 65 4.7.Dy pigtail v dy nhy quang: ....................................................................................... 66 4.8.Cc loi connector v Adaptor:....................................................................................... 66 5.Thi cng hn nI cp quang: ...................................................................................67 5.1.Nguyn tc chung: .......................................................................................................... 67 5.2.Trnh t hn ni cp bn ngoi:....................................................................................... 67 5.2.1.Cng tc chun b: ................................................................................................ 67 5.2.2.Chun b my hn: ................................................................................................ 67 5.2.3.Thao tc hn: ........................................................................................................ 67 5.2.4.Hon tt mi ni: .................................................................................................. 68 5.3.Trnh t hn ni cp trong i:........................................................................................ 68 5.3.1.Cng tc chun b: ................................................................................................ 68 5.3.2.Hn ni si quang v hon tt mi hn:................................................................. 68 Chng 6. O TH CP SI QUANG........................................................................69 1.NGUYNNHNGYSUYHAOVMCCHOSUYHAOCPSI QUANG: .................................................................................................................69 1.1.Nguyn nhn: ................................................................................................................. 69 1.2.Mc ch: ....................................................................................................................... 69 2.CC PHP O CP QUANG: ...............................................................................70 2.1.n v o lng suy hao:................................................................................................ 70 2.2.Cc php o cp quang: .................................................................................................. 70 3.MY O QUANG DI THEO MIN THI GIAN OTDR:...................................70 3.1.Nguyn l hot ng ca my o OTDR:........................................................................ 70 3.2.Cc thng s chnh ca my o:...................................................................................... 71 3.2.1.Tn s pht xung:.................................................................................................. 71 3.2.2.Thi gian qut:...................................................................................................... 71 3.2.3.Khong cch o v phn gii:........................................................................... 71 3.2.4.B rng xung: ....................................................................................................... 72 Trang4 3.2.5.Chit sut:............................................................................................................. 72 3.2.6.Tn x ngc: ....................................................................................................... 72 3.2.7.Vng cht: ............................................................................................................ 72 3.2.8.Xc nh cc im c bit trn th:.................................................................. 72 4.O SUY HAO IM, SUY HAO TON TUYN BNG OTDR:.........................73 4.1.o th trc tip cp quang bng my o OTDR:............................................................. 73 4.2.o th suy hao connector bng my OTDR: ................................................................... 73 4.3.o th suy hao mi hn bng OTDR: ............................................................................. 74 4.3.1.B tr o th theo phng php mch vng:.......................................................... 74 4.3.2.o th suy hao ton tuyn bng OTDR: ................................................................ 75 5.B MY O THU PHT CNG SUT................................................................77 5.1.Gii thiu v my thu pht cng sut quang : .................................................................. 77 5.2.Nguyn l hot ng:...................................................................................................... 77 5.3.o th suy hao ton tuyn bng my o cng sut quang:............................................... 77 6.TNH TON V NH GI CHT LNG SUY HAO TON TUYN. ..........78 Trang5 DANH SCH HNH V Hnh 1.1. Cu trc tiu biu ca mng cp quang thu bao................................................8 Hnh 1.2. Phn b b chia Splitter tiu biu trn mng ......................................................9 Hnh 1.3. Cu trc u ni c bn ti t phi quang cp 1 ...............................................10 Hnh 1.4. Cu trc u ni c bn ti t phi quang cp 2 ...............................................10 Hnh 1.5. Cu trc u ni c bn ti tp im................................................................10 Hnh 2.1: Cu trc tiu biu cho si cp quang treo.........................................................18 Hnh 2.2. Cu trc tiu biu cho si cp quang ko cng.................................................21 Hnh 2.4. Cu trc tiu biu cho si cp quang thu bao (drop fiber)...............................23 Hnh 2.5: Dy nhy quang...............................................................................................24 Hnh 2.6: Cu trc c bn ca si dy nhy quang...........................................................25 Hnh 2.7: Dy Pigtail.......................................................................................................25 Hnh 2.8: Hp u ni quang ph hp theo dng treo tng (ODF).................................27 Hnh 2.9: Module u ni quang ph hp lp t theo kiu Rack ETSI ...........................27 Hnh 2.10: Module u ni quang ng/m theo kiu bn l ...........................................28 Hnh 2.11: Thnh phn lu tr si quang.........................................................................28 Hnh 2.12: Cu trc tiu biu ca mt Rack u ni quang dung lng cao (FDF) c cc thnh phn lu tr si quang dc theo hai bn t......................................................29 Hnh 2.13: T u ni quang ngoi tritiu biu............................................................30 Hnh 2.14: Mng xng hn ni cp quang........................................................................31 Hnh 2.14: Dng hnh hc ca u ni c tip xc PC.....................................................33 Hnh 2.15: Dng hnh hc ca u ni c tip xc UPC ..................................................33 Hnh 2.16: Dng hnh hc ca u ni c tip xc APC ..................................................33 Hnh 2.17: u ni ST.....................................................................................................33 Hnh 2.18: u ni SC ....................................................................................................34 Hnh 2.19: u ni FC ....................................................................................................34 Hnh 2.20: Nguyn tc hot ng c bn ca b Splitter..................................................35 Hnh 2.21: Biu so snh suy hao xen gia 2 loi cng ngh ch to Splitter................36 Hnh 3.1: T hp ng subduct 34.................................................................................42 Hnh 3.2: Lun dy mi bng my nn khi ......................................................................42 Hnh 3.3: Ko t hp ng vo ng pi...........................................................................43 Hnh 3.4: ng 34 sau khi th vo ng pi 110........................................................43 Hnh 3.5: Que st c vng m da chuyn dng ..............................................................44 Hnh 3.6: Thi dy mi vo lng ng ..............................................................................44 Trang6 Hnh 3.7: Cng nhn y ghi vo lng ng......................................................................44 Hnh 3.8: B b xon.......................................................................................................45 Hnh 3.9: Ko cp quang trong cng................................................................................45 Hnh 3.10: Xp cp hnh s 8...........................................................................................45 Hnh 3.11: Xp t cp v mi ni trong hm..................................................................46 Hnh 3.12: Trang b mt bulng vi mc J v kp treo cp..............................................47 Hnh 3.13: a cp ln mc J..........................................................................................47 Hnh 3.14: Dng sc ngi cng cp ..........................................................................48 Hnh 3.15: Kt cui cp trn ct ......................................................................................48 Hnh 3.16: Rnh chn cp trc tip..................................................................................50 Hnh 3.17: Cun bng bo hiu .......................................................................................50 Hnh 3.18: Ct mc ch tuyn dng cho tuyn cp quang................................................51 Hnh 5. 1.B ngh thi cng cp quang ......................................................................58 Hnh 5.2. Dng c ct dc si cp quang.........................................................................58 Hnh 5.3. Dng c tut ng m......................................................................................59 Hnh 5.4.Cc loi dng c chuyn dng v km tut lp bc.........................................60 Hnh 5.5. Dng c tut si quang bng nhit ...................................................................60 Hnh 5.6. Dao ct s quang A8........................................................................................61 Hnh 5.7.Dao ct si quang D6......................................................................................61 Hnh 5.8: Mi ni kt dnh c kh....................................................................................62 Hnh 5.9. Dng c lp rp mi ni v mi ni c kh hon chnh.....................................62 Hnh 5.10 Module u ni quang lp trn gi 19............................................................65 Hnh 5.11 T cp quang ..................................................................................................65 Hnh 5.12Tp im cp quang.......................................................................................66 Hnh 5.13 Dy Pigtail v dy nhy quang........................................................................66 Hnh 5.14Cc loi u ni quang.....................................................................................66 Hnh 6.1.Suy hao do tn x v tn x ngc..................................................................69 Hnh 6.2.Suy hao si quang theo bc sng ..................................................................69 Hnh 6.3. suy hao khp ni v mi hn hin th trn mn hnh my OTDR .....................72 Hnh 6.5.S u ni cp quang. ................................................................................73 Hnh 6.6. th biu din trn my OTDR ....................................................................73 Hnh 6.7.S u ni o connector .............................................................................74 Hnh 6.8. Biu din th trn mn hnh my o.............................................................74 Hnh 6.9.S u ni khi o .......................................................................................75 Hnh 6.10. th o hng i. .......................................................................................75 Trang7 Hnh 6.11. th o hng v. ......................................................................................75 Hnh 6. 12.S u ni o ton tuyn cp...................................................................76 Hnh 6. 13. th kt qu ton tuyn hng i ...............................................................76 Hnh 6.14. th kt qu ton tuyn hng v. ..............................................................76 Hnh 6.15.My pht cng sut quangv my thu cng sut quang................................77 Hnh 6.16.S u ni o suy hao bng my o cng sut quang ...............................78 Hnh 6.17. Bng gi tr suy hao ca mi ni hn v connector.........................................79

Trang8 Chng 1. CU TRC MNG CP QUANG THU BAO FTTx 1.CU TRC MNG CP QUANG THU BAO FTTX Cu trc tiu biu ca mng cp quang thu bao FTTx c m t theo hnh di: Hnh 1.1. Cu trc tiu biu ca mng cp quang thu bao T hnh v trn, cu trc ca mng cp quang thu bao tiu biu s bao gm cc thnh phn sau: 1.1. T quang phi cp 1:-T quang phi cp 1 ng vai tr tp trung dung lng cp gc cn phc v cho 01 khu vc do t quang phi cp 1 ny qun l.-Ti/trm n t quang phi cp 1, l tp hp cc si cp quang gc n t quang phi cp 1. -T quang phi cp 1 ny slnilpt cc b chia splitter cp 1 (S1) trn mng. -Dunglng cho 01 si cp quang gc tiu biu i rat i/trm n t quang phi cp 1 ti thiu l 48F.O. 1.2. T quang phi cp 2:-T quang phi cp 2ng vai tr tptrungdunglng cp phi cn phc v cho 01 khu vc do t quang phi cp 2 ny qun l. Vcbn, 01 t quang phi cp 1 s qun l nhiu t quang phi cp 2.-T t quang phi cp 1 n t quang phi cp 2, l tp hp cc si cp quang phi n t quang phi cp 2. -T quang phi cp 2 ny slnilpt cc b chia splitter cp 2 (S2) trn mng. -Dung lng cho 01 si cp quang phi tiu biu i ra t t quang phi cp 01 n t quang phi cp 2 ti thiu l 48F.O. 1.3. Tp im quang:-Tp im quang l ni phi cp quang th bao n khch hng.-T t quang phi cp 2 n tp im quang l tp hp cc si quang phi n tp im. -Dung lng cho 01 si cp quang phi tiu biu i n tp im quang c dung lng ti thiu l 12FO. Trang9 1.4. B chia (Splitter): -B chia (Splitter) l thit b ghp/chia tch quang th ng khng cn ngun.-B chia (Splitter) sc thit k ph bin trn tng tuyn cp ca mng cp quang thu bao c tng t l chia ti a cho php hin nay l 1: 64. -Phn b b chia ph bin trn mng theo t l chia 1: 2 ti t quang phi cp 1 vt l chia 1: 32 ti t quang phi cp 2. Hnh 1.2. Phn b b chia Splitter tiu biu trn mng 2.T CHC QUN L CC THNH PHN TRONG CU TRC MNG CP QUANG THU BAO FTTX Vic qun l cc thnh phn chnh trong cu trc s tun theo mt s cc nguyn tc c bn sau: -01 t cp quang phi cp 1 c dung lng t 384 F.O (c s dng kt ni cho) s qun l ti a 06 t quang phi cp 2. -01 t cp quang phi cp 2 c dung lng tia96F.O(khngs dng cu trc u ni cho) s qun l ti a 08 tp im quang. -Tp im quang s dng lai c bn c dung lngu ni ti thiu 24F.O. -Cp quang t t cp quang phi cp 2 ti tp im c dung lng ti thiu 12 F.O. -Cp quang vo cc khu building s dng ti thiu cp c dung lng 24 F.O. 3.T CHC VNG PHC V -Mng cp quang thu bao c phn thnh cc vng mng theo ng vng phc v ca cc i/trm tng i ni ht hin hu nhm to s thun tin trong vic qun l v pht huy hiu qu cc ngun lc snc(cs h tng, khnngpng, phc v khch hng). -Vng phc v ca mt t cp quang cp 1 v cp 2 bn knh khng qu 1.000m (ni thnh) v 1.500m (ngoi thnh). -Vng phc v ca mt tpim quang bn knh khng qu 300m (ni thnh) v 500m (ngoi thnh). -Trn thc t ty vo khu vc thu bao v a hnh l ca khu vc thu bao c th, m c th b tr cc v tr S1 v S2 cho ph hp. Chng hn vi cc khu cao c vn phng, thng mi hay chung c cao cp, S2 c th c b tr bn trong tng khu. Hoc S1 c b tr ring phc v cho 01 khu cng nghip hay khu cng ngh cao, Trang10 4.CU TRC U NI C BN 4.1.Cu trc u ni ti t phi quang cp 1 T phi quang cp 1lni u ni cp quang gc v cp quang phi. T phi quang cp 1 gm c: khy hn ni cp quang gc vo, vi tr ng cc module splitter v module hn ni cp quang phi i ra. Vi cu to ny s cung cp chc nng u ni linh hot khi s dng : u ni thng v u ni cho qua splitter hoc khng qua splitter gip thun tin trong qu trnh khai thc v chuyn i loi hnh cung cp dch v khi cn thit. Hnh 1.3. Cu trc u ni c bn ti t phi quang cp 1 4.2.Cu trc u ni ti t phi quang cp 2 Hnh 1.4. Cu trc u ni c bn ti t phi quang cp 2 Ging nh t phi quang cp 1, t phi quang cp 2 c dung lng thp hn v khng c chcnngu ni cho gia cp quang phivovcpquangran tp im. 4.3. Cu trc u ni ti tp im Hnh 1.5. Cu trc u ni c bn ti tp im Trang11 5.MTTNGQUANTNHNNGKTHUTCACCVTT MNG QUANG GPON: Cp quang: s dng lai ng m lng, theo tiu chun ITU G652.D. Suy hao si quang bao gm mi hn: - 1310nm v 1490nm: 0.35dB/km - 1550nm: 0.3 dB/kmMi ni: S dng mi ni c kh,yu cu kn nc, c kh nng r nhnh, c th lp t trong hm hoc trn ct, bn trong c cc khay hn ni v lp t b chia quang. B chia quang: c kh nng chia ghp cng sut quang 1:2,1:4, 1:8,1:16, 1:32, 1:64 c u ni SC/APC. Suy hao b chia ghp quang: T l1:21:41:81:161:321:64 Suy hao ln nht dB3.67.310.513.817.120.5 Tphiquangcp1(S1): S dng lai lp trn b, c khnngu nhy quang, c cc khay hn lp c cc b Spliter, c h thng i dy nhy v lu tr dy tha, m bo tiu chun un cong ca siquang.Dunglng tia 384FO c khnnggnccmoduleudyquang.Kchthc t nh gn, qun l v thao tc khai thc d dng. Module u dy ti t S1:c khay hn, u ni SC/APC, pigtail, tng thch vi v t.Hp gn b chia quang trn ct (S2): S dng lai lp trn ct, c khay hn cha c Splitter, u ni SC/APC, pigtail, c kh nng gn ti a 96 u ni SC/APC (khng nhy quang).Kch thc nh gn c kh nng gn trn ct hoc trn tng. Tpimquang: Sdnglailptrn ct,ckhayhn chacSplitter, u ni SC/APC, pigtail, dung lng thng thng 24, 48 FO. V tr cp vo v ra c thacpvohpm khng phictngmlngchasiquang. Kch thc nh gn c kh nng gn trn ct hoc trn tng. Cc vt t treo cp khc: s dng cc chng lai hin hu ang p dng trn mng. Trang12 Chng 2. TIU CHUN K THUT CP QUANG 1.CP SI QUANG1.1. Gii thiu chung Cp si quang c lm bng vt liu si thy tinh trong sut dng truyn thng tindi dngnhsngciu ch chydc theo cc si quang. Hin nay, cp si quang c s dng rng ri cho cc mng truyn dn lin i, cc t tip cn thu bao v gn y nht l vic trin khai mng cp quang theo m hnh FTTx, ngha l cp quang sc trinkhai n nh khch hng (FTTH-FibertoTheHome), n cc ta nh vn phng, cao c, khch sn (FTTB-FibertoTheBuilding), n cc khu cng nghip, cng nghcao,khudnctp trung (FTTN- Fiber to The Node).Docpsi quangc a vo s dng s c nhiu chng loi khc nhau ph hp vi cu hnh ca tng mng c th, chng hn mng ng trc, lin i nn s dng loi cp quang n mode dung lng ln c th lnn hngtrm si, mng tip cn thu bao s dng loi cp quang n mode dung lng nh t 12 si n 48 si, cp quang thu bao s dng dung lng nh v va t4F.On24F.O(tytheoitng khch hng), mng trc cp quang thu bao FTTx (i hi dung lng cp ln cho phn cp gc v phi, d dng u ni, d dng tch ghp si quang, t cht lng cao v n nh) nn s dng loi cp quang n mode dung lng ln hn c th ln n hng trm si. 1.2. Tiu chun k thut 1.2.1.Tiu chun v cht lng truyn dn ca si quang1.2.1.1.Tiu chun cht lng truyn dn cho si quang n mode (ch yu da theo G.652D) Tiu chun ny c p dng cho cc loi cp treo, ko cng, chn trc tip, cp trong nh v thu bao drop fiber STTThng SGi Tr 1ng knh trng mode (MFD) - Ti bc sng 1.310 nm - Dung sai cho php 8,6 9,5 m 0.5 m 2ng knh v (Cladding Diameter)125 m 1 m 3Sai s ng tm gia li v v (Core concentricity error) 0,6 m 4 khng trn u ca v (Cladding noncircularity)