Cov lus piv txwv: Kev sib txuas lus fiber ntau tau muab faib ua ib hom fiber ntau thiab multimode fiber ntau raws li tus naj npawb ntawm cov qauv sib kis raws li nws daim ntawv thov wavelength.Vim qhov loj ntawm cov tub ntxhais txoj kab uas hla ntawm multimode fiber ntau, nws tuaj yeem siv nrog cov khoom siv hluav taws xob tsawg. Yog li ntawd, nws muaj ntau yam kev siv nyob rau hauv luv luv kis scenarios, xws li cov chaw zov me nyuam cov ntaub ntawv thiab cov cheeb tsam hauv cheeb tsam network. Nrog rau kev loj hlob sai ntawm cov ntaub ntawv chaw tsim kho nyob rau hauv xyoo tas los no, multimode fiber ntau, uas yog lub ntsiab ntawm cov ntaub ntawv chaw thiab hauv cheeb tsam. network daim ntaub ntawv, kuj tau ushered nyob rau lub caij nplooj ntoos hlav, ua rau muaj kev txhawj xeeb thoob plaws.Hnub no, cia peb tham txog txoj kev loj hlob ntawm multimode fiber ntau.
Raws li tus txheej txheem ISO/IEC 11801 specification, multimode fiber ntau muab faib ua tsib pawg loj: OM1, OM2, OM3, OM4, thiab OM5.Nws sau ntawv nrog IEC 60792-2-10 yog qhia nyob rau hauv Table 1.Nrog lawv OM1, OM2 hais txog cov tsoos 62.5/125mm thiab 50/125mm multimode fiber. OM3, OM4 thiab OM5 xa mus rau 50/125mm 10 Gigabit multimode fiber ntau.
Ua ntej:cov tsoos multimode fiber ntau
Txoj kev loj hlob ntawm multimode fiber ntau pib hauv xyoo 1970 thiab 1980s. Thaum ntxov multimode fibers suav nrog ntau qhov ntau thiab tsawg, thiab plaub hom ntau thiab tsawg suav nrog hauv International Electrotechnical Commission (IEC) cov qauv suav nrog plaub.Cov tub ntxhais cladding txoj kab uas hla yog muab faib ua 50/125 μm, 62.5/125 μm, 85/125 μm, thiab 100/ 140 μm.Vim qhov loj ntawm cov tub ntxhais cladding, cov nqi tsim khoom yog siab, qhov khoov tsis zoo, cov qauv sib kis tau nce, thiab cov bandwidth raug txo. Yog li ntawd, hom ntawm cov tub ntxhais loj cladding loj yog maj tshem tawm, thiab ob lub ntsiab cladding qhov ntau thiab tsawg yog maj mam tsim. Lawv yog 50/125 μm thiab 62.5 / 125 μm, feem.
Nyob rau hauv lub zos cheeb tsam thaum ntxov network, thiaj li yuav txo tau cov nqi system ntawm lub zos cheeb tsam network kom ntau li ntau tau, ib tug tsawg-nqi LED feem ntau yog siv los ua ib lub teeb qhov chaw.Vim LED tso zis tsawg zog, lub divergence lub kaum sab xis kuj loj. . Txawm li cas los xij, cov tub ntxhais txoj kab uas hla thiab cov lej aperture ntawm 50/125mm multi-mode fiber ntau kuj yog me me, uas tsis zoo rau kev sib txuas nrog LED. Raws li rau 62.5 / 125mm multi-mode fiber ntau nrog cov tub ntxhais txoj kab uas hla loj thiab cov lej aperture, ntau lub zog kho qhov muag tuaj yeem ua ke rau qhov txuas kho qhov muag.Yog li ntawd, 50/125mm multimode fiber ntau tsis tau siv dav li 62.5/125mm multimode fiber ntau ua ntej. nruab nrab-1990s.
Nrog kev nce ntxiv ntawm LAN kev sib kis tus nqi, txij li thaum xaus ntawm lub xyoo pua 20th, LAN tau tsim los saum toj no tus nqi lGb/s. Lub bandwidth ntawm 62.5 / 125μm multimode fiber ntau nrog LED raws li lub teeb ci tsuas yog maj mam ua tsis tau raws li qhov yuav tsum tau ua.In contrast, 50/125mm multimode fiber ntau muaj cov lej me me aperture thiab core txoj kab uas hla, thiab tsawg dua conduction hom. Yog li ntawd, hom Dispersion ntawm ntau hom fiber ntau yog txo kom zoo, thiab bandwidth tau nce ntau. Vim lub me me txoj kab uas hla, tus nqi ntau lawm ntawm 50/125mm multi-mode fiber ntau kuj qis dua, yog li nws yog dav siv dua.
IEEE 802.3z Gigabit Ethernet tus qauv qhia tau hais tias 50/125mm multimode thiab 62.5/125mm multimode fibers tuaj yeem siv los ua kis xov xwm rau Gigabit Ethernet. Txawm li cas los xij, rau cov tes hauj lwm tshiab, 50/125mm multimode fiber ntau feem ntau nyiam.
Thib ob:laser optimized multimode fiber ntau
Nrog rau kev txhim kho thev naus laus zis, 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) tau tshwm sim.VCSEL lasers tau dav siv vim tias lawv pheej yig dua cov lasers ntev thiab tuaj yeem ua kom cov network nrawm dua.VCSEL lasers tau dav siv vim tias lawv pheej yig dua ntev- wavelength lasers thiab tuaj yeem nce network speeds.Vim qhov sib txawv ntawm ob hom teeb pom kev zoo, fiber ntau nws tus kheej yuav tsum tau hloov kho kom haum raws li cov kev hloov hauv lub teeb.
Rau cov kev xav tau ntawm VCSEL lasers, Lub Koom Haum International rau Standardization/International Electrotechnical Commission (ISO/IEC) thiab Telecommunications Industry Alliance (TIA) tau sib koom ua ke tsim qauv tshiab rau multimode fiber ntau nrog 50mm core.ISO/IEC cais cov tiam tshiab. ntawm multimode fiber ntau rau hauv OM3 qeb (IEC standard A1a.2) hauv nws cov qib multimode fiber ntau, uas yog laser-optimized multimode fiber ntau.
Cov tom ntej OM4 fiber ntau yog qhov hloov kho dua tshiab ntawm OM3 multimode fiber ntau.Piv nrog OM3 fiber ntau, OM4 tus qauv tsuas yog txhim kho cov fiber ntau bandwidth index.Qhov ntawd yog, OM4 fiber tus qauv tau txhim kho cov txiaj ntsig zoo bandwidth (EMB) thiab tag nrho txhaj tshuaj bandwidth. (OFL) ntawm 850 nm piv rau OM3 fiber ntau. Raws li qhia hauv Table 2 hauv qab no.
Muaj ntau hom kev sib kis hauv multimode fiber ntau, thiab qhov teeb meem ntawm kev khoov ntawm cov fiber ntau kuj tau coj los txog. Thaum cov fiber ntau yog khoov, hom kev txiav txim siab tau yooj yim xau, ua rau poob ntawm cov teeb liab, uas yog, khoov poob ntawm cov fiber ntau. Nrog rau qhov nce ntawm cov ntawv thov hauv tsev, cov xaim ntawm multimode fiber ntau hauv qhov chaw nqaim tau muab tso rau. xa mus rau cov kev xav tau ntau dua rau nws txoj kev khoov khoov.
Tsis zoo li qhov yooj yim refractive index profile ntawm ib hom fiber ntau, qhov refractive index profile ntawm multimode fiber ntau complex, yuav tsum tau ib tug zoo heev refractive index profile tsim thiab fabrication txheej txheem. Feem ntau cov kev npaj ntawm multimode fiber ntau yog cov txheej txheem plasma tshuaj huab cua deposition (PCVD), sawv cev los ntawm Changfei Company.Cov txheej txheem no txawv ntawm lwm cov txheej txheem nyob rau hauv uas nws muaj ib tug deposition txheej ntawm ob peb txhiab txheej thiab ib tug tuab ntawm tsuas yog hais txog 1 micron ib txheej thaum lub sij hawm. deposition, enabling ultra-fine refractive index nkhaus tswj kom ua tau siab bandwidth.
Los ntawm optimizing qhov refractive index profile ntawm multimode fiber ntau, qhov khoov-insensitive multimode fiber ntau muaj kev txhim kho tseem ceeb hauv kev khoov tsis kam, raws li qhia hauv daim duab 1 hauv qab no.
Fig.1 Kev sib piv ntawm macrobend kev ua tau zoo ntawm bending-resistant multimode fiber ntau thiab cov pa multimode fiber ntau
Peb:Tus tshiab multimode fiber ntau (OM5)
OM3 fiber ntau thiab OM4 fiber ntau yog ntau hom fiber ntau siv nyob rau hauv 850nm band.Raws li kev sib kis tus nqi txuas ntxiv mus ntxiv, tsuas yog ib txoj kab tsim ib leeg xwb yuav ua rau cov nqi txuas ntxiv ntau dua, thiab cov nqi sib txuas thiab kev saib xyuas yuav nce ntxiv. .Yog li ntawd, cov kws kho mob sim ua kom paub lub wavelength division multiplexing tswvyim rau hauv multimode kis tau tus mob. Yog tias muaj ntau lub wavelengths tuaj yeem xa mus rau ntawm ib qho fiber ntau, tus naj npawb ntawm cov fiber ntau sib npaug thiab tus nqi ntawm kev tso thiab kev saib xyuas tuaj yeem txo qis heev.Hauv cov ntsiab lus no, OM5 fiber ntau tau los ua.
OM5 multimode fiber ntau yog ua raws li OM4 fiber ntau, uas nthuav dav lub siab-bandwidth channel thiab txhawb nqa kev sib kis ntawm 850nm txog 950nm.Cov ntawv thov tam sim no yog SWDM4 thiab SR4.2 tsim. SWDM4 yog lub wavelength division multiplexing ntawm plaub luv nthwv dej, uas yog 850 nm, 880 nm, 910 nm, thiab 940 nm, feem. SR4.2 yog ob-wavelength division multiplexing, feem ntau yog siv rau ib leeg-fiber bidirectional technology.The OM5 tuaj yeem sib phim nrog VCSEL lasers nrog kev ua haujlwm qis thiab tus nqi qis kom zoo dua kev sib txuas lus luv luv xws li cov ntaub ntawv chaw.Table 3 hauv qab no yog Kev sib piv ntawm lub ntsiab bandwidth specifications rau OM4 thiab OM5 fibers.
Tam sim no, OM5 fiber ntau tau siv los ua ib hom tshiab ntawm high-end multimode fiber ntau.Ib qho kev lag luam loj tshaj plaws yog OM5 kev lag luam rooj plaub ntawm Changfei thiab Tuam Tshoj Railways Corporation cov ntaub ntawv tseem ceeb.Cov ntaub ntawv chaw yog aiming ntawm daim ntawv thov zoo ntawm OM5 fiber ntau nyob rau hauv lub wavelength faib system ntawm SR4.2. Nws ua tiav qhov kev sib txuas lus muaj peev xwm tshaj plaws ntawm tus nqi qis tshaj plaws, thiab npaj rau kev hloov kho tus nqi ntxiv rau yav tom ntej. Tus nqi yav tom ntej yuav nce mus rau 100Gb / s lossis txawm tias 400Gb. /s, lossis cov ntawv thov dav dav, tsis tuaj yeem hloov pauv fiber ntau, txo cov nqi hloov kho yav tom ntej.
Cov ntsiab lus: Raws li qhov kev thov rau daim ntawv thov txuas ntxiv mus, multimode fiber ntau tau txav mus rau qhov qis qis, siab bandwidth, thiab ntau lub wavelength multiplexing.Ntawm lawv, feem ntau cov ntawv thov yog OM5 fiber ntau, uas muaj qhov ua tau zoo ntawm cov khoom siv fiber ntau tam sim no, thiab muab cov kev daws teeb meem muaj zog fiber ntau rau ntau lub tshuab hluav taws xob ntawm 100Gb / s thiab 400Gb / s yav tom ntej. Ntxiv rau, txhawm rau ua kom tau raws li cov kev xav tau ntawm kev kub ceev, siab bandwidth, nqi qis cov ntaub ntawv chaw sib txuas lus, multimode tshiab fibers, xws li ib leeg multimode general-purpose fibers, kuj tseem raug tsim.Nyob rau hauv lub neej yav tom ntej, Changfei yuav tshaj tawm ntau tshiab multimode fiber ntau daws nrog kev lag luam cov phooj ywg, coj tshiab breakthroughs thiab txo nqi rau cov ntaub ntawv chaw thiab fiber optic interconnects.