Okwu mmalite: Nkwukọrịta eriri na-ekewa n'ime otu mode eriri na multimode eriri dị ka ọnụ ọgụgụ nke nnyefe ụdịdị n'okpuru ya ngwa wavelength.Due ka nnukwu isi dayameta nke multimode eriri, ọ ga-eji na ala na-eri ìhè isi mmalite. Ya mere, ọ nwere ngwa ngwa dị iche iche na ntanetị mgbasa ozi dị mkpirikpi, dị ka ebe data data na netwọk mpaghara. Site na mmepe ngwa ngwa nke ụlọ ọrụ data n'ime afọ ndị na-adịbeghị anya, multimode fiber, nke bụ isi nke data data na mpaghara mpaghara. Ngwa netwọkụ, nwekwara butere na mmiri, na-akpata nchegbu zuru ebe niile. Taa, ka anyị kwuo banyere mmepe nke multimode eriri.
Dị ka ọkọlọtọ ISO/IEC 11801 nkọwapụta, multimode eriri na-ekewa ise isi edemede: OM1, OM2, OM3, OM4, na OM5.Ya akwụkwọ ozi na IEC 60792-2-10 e gosiri na Table 1. N'etiti ha OM1, OM2. na-ezo aka omenala 62.5/125mm na 50/125mm multimode eriri. OM3, OM4 na OM5 na-ezo aka na eriri multimode 50/125mm 10 Gigabit ọhụrụ.
Mbụ:na omenala multimode eriri
Mmepe nke eriri multimode malitere na 1970 na 1980. Akpa multimode eriri gụnyere ọtụtụ nha, na ụdị anọ dị iche iche gụnyere na International Electrotechnical Commission (IEC) ụkpụrụ gụnyere four. The isi cladding dayameta na-ekewa n'ime 50/125 μm, 62.5/125 μm, 85/125 μm, na 100/ 140 μm. N'ihi nnukwu ihe mkpuchi isi, ọnụ ahịa mmepụta ihe dị elu, nkwụsị nkwụsị na-adịghị mma, ọnụ ọgụgụ nke ụdị nnyefe na-abawanye, na bandwit na-ebelata. Ya mere, a na-eji nwayọọ nwayọọ na-ewepụ ụdị nke nnukwu isi ihe mkpuchi, na-eji nwayọọ nwayọọ na-emepụta isi ihe abụọ bụ isi. Ha bụ 50/125 μm na 62.5/125 μm, n'otu n'otu.
Na netwọk mpaghara mbụ, iji belata ụgwọ usoro nke netwọk mpaghara dị ka o kwere mee, a na-ejikarị ọkụ ọkụ ọkụ ọkụ ọkụ ọkụ. N'ihi ike mmepụta ọkụ ọkụ dị ala, akụkụ dị iche iche dị nnọọ ukwuu. . Otú ọ dị, isi dayameta na oghere ọnụọgụ nke 50/125mm multi-mode fiber dị ntakịrị, nke na-adịghị akwado ijikọ nke ọma na LED. Dị ka 62.5 / 125mm multi-mode eriri na nnukwu isi dayameta na ọnụ ọgụgụ aperture, ọzọ ngwa anya ike nwere ike jikọtara na ngwa anya njikọ.Ya mere, 50 / 125mm multimode eriri e bụghị dị ka ọtụtụ ebe na-eji dị ka 62.5 / 125mm multimode eriri n'ihu. etiti 1990s.
Site na mmụba na-aga n'ihu nke ọnụego mgbasa ozi LAN, kemgbe njedebe nke narị afọ nke 20, LAN emebela karịa ọnụego lGb/s. The bandwit nke 62.5 / 125μm multimode fiber na LED dị ka ìhè isi bụ nanị nke nta nke nta na-enweghị ike izute chọrọ. N'ụzọ dị iche, na 50 / 125mm multimode eriri nwere a nta ọnụọgụ ọnụọgụgụ oghere na isi dayameta, na ole na ole conduction modes.Ya mere, mode mgbasa nke multi-mode eriri na-n'ụzọ dị irè belata, na bandwit na budata ụba. N'ihi na obere isi dayameta, mmepụta na-eri nke 50/125mm multi-mode eriri nwekwara ala, n'ihi ya, ọ na-ọtụtụ ebe ọzọ.
Ụkpụrụ IEEE 802.3z Gigabit Ethernet na-akọwapụta na enwere ike iji 50/125mm multimode na 62.5/125mm multimode fibers dị ka mgbasa ozi mgbasa ozi maka Gigabit Ethernet. Otú ọ dị, maka netwọk ọhụrụ, 50/125mm multimode fiber na-ahọrọkarị.
Nke abụọ:laser kachasị multimode eriri
Site na mmepe nke teknụzụ, 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) pụtara.A na-eji laser VCSEL eme ihe n'ọtụtụ ebe n'ihi na ha dị ọnụ ala karịa lasers ogologo ogologo ma nwee ike ịbawanye ọsọ netwọkụ. lasers wavelength ma nwee ike ịbawanye ọsọ netwọkụ. N'ihi ọdịiche dị n'etiti ụdị abụọ nke ngwaọrụ na-enye ọkụ, a ghaghị gbanwee eriri n'onwe ya iji nabata mgbanwe na isi iyi ọkụ.
Maka mkpa nke VCSEL lasers, International Organisation for Standardization/International Electrotechnical Commission (ISO/IEC) na Telecommunications Industry Alliance (TIA) ejikọtawo ọnụ depụtara ọkọlọtọ ọhụrụ maka eriri multimode nwere isi 50mm.ISO/IEC na-ekewa ọgbọ ọhụrụ. nke multimode eriri n'ime OM3 Atiya (IEC ọkọlọtọ A1a.2) na ya ọhụrụ multimode eriri grade, nke bụ a laser-kacha mma multimode eriri.
OM4 eriri na-esote bụ n'ezie ụdị nkwalite nke OM3 multimode fiber. E jiri ya tụnyere OM3 fiber, ụkpụrụ OM4 na-eme ka eriri bandwit dị mma na-eme ka ọ dịkwuo mma. (OFL) na 850 nm ma e jiri ya tụnyere eriri OM3. Dị ka e gosiri na Tebụl 2 n'okpuru.
Enwere ọtụtụ ụdị nnyefe na eriri multimode, na nsogbu nke ịgbado nkwụsi ike nke eriri ahụ na-ebutekwa ya. Mgbe eriri na-ehulata, na elu-usoro mode na-adị mfe leaked, na-akpata ọnwụ nke mgbaàmà, ya bụ, ekwe ọnwụ nke fiber.With na-amụba ọnụ ọgụgụ nke ime ụlọ ngwa ndapụta, na wiring nke multimode eriri na a warara gburugburu ebe obibi etinyewo. n'ihu elu chọrọ n'ihi na ya ekwe iguzogide.
N'adịghị ka profaịlụ ntugharị dị mfe nke eriri otu ụdị, profaịlụ ngbanwe nke eriri multimode dị mgbagwoju anya, na-achọ nhazi profaịlụ profaịlụ dị mma na imepụta usoro. Nkwadebe kachasị nke ọma nke eriri multimode bụ usoro plasma chemical weather deposition (PCVD), nke Changfei Company na-anọchi anya ya. Usoro a dị iche na usoro ndị ọzọ na ọ nwere akwa mkpuchi nke ọtụtụ puku akwa akwa na ọkpụrụkpụ nke naanị banyere 1 micron kwa oyi akwa n'oge. nkwụnye ego, na-enyere ultra-fine refractive index curve control iji nweta bandwit dị elu.
Site n'ịkwalite profaịlụ index refractive nke eriri multimode, eriri multimode na-ehulata na-enwe ọganihu dị ịrịba ama na nkwụghachi ụgwọ, dị ka egosiri na foto 1 n'okpuru.
Fig.1 Ntụle nke macrobend arụmọrụ n'etiti ekwe-eguzogide multimode eriri na ot multimode eriri
Nke atọ:eriri multimode ọhụrụ (OM5)
OM3 eriri na fiber OM4 bụ eriri multimode nke a na-ejikarị na band 850nm. Dị ka nnyefe ọnụego na-aga n'ihu na-abawanye, ọ bụ naanị otu ọwa band imewe ga-eme ka ọnụ ahịa wiring dịkwuo elu, na njikwa na njikwa na-akwụ ụgwọ ga-abawanye otú ahụ. Ya mere, technicians na-agbalị ịmebata wavelength nkewa multiplexing echiche n'ime multimode nnyefe usoro. Ọ bụrụ na enwere ike ibunye ọtụtụ wavelengths n'otu eriri, ọnụ ọgụgụ kwekọrọ ekwekọ nke eriri na ọnụ ahịa nke ịtọgbọ na ndozi nwere ike belata nke ukwuu. N'okwu a, eriri OM5 bịara.
OM5 multimode fiber dabeere na fiber OM4, nke na-eme ka ọwa bandwidth dị elu ma na-akwado ngwa nnyefe site na 850nm ruo 950nm. Ngwa ndị a na-emekarị ugbu a bụ SWDM4 na SR4.2 aghụghọ. SWDM4 bụ a wavelength nkewa multiplexing nke anọ mkpụmkpụ ebili mmiri, nke bụ 850 nm, 880 nm, 910 nm, na 940 nm, karị. SR4.2 bụ nkewa nkewa nke abụọ nke multiplexing, nke a na-ejikarị eme ihe maka teknụzụ otu-fiber bidirectional. OM5 nwere ike ijikọta ya na VCSEL lasers na arụmọrụ dị ala na ọnụ ala dị ala iji zute nkwurịta okwu dị mkpirikpi dị ka ebe data.Table 3 n'okpuru ebe a bụ. ntụnyere nkọwa nke bandwidth isi maka eriri OM4 na OM5.
Ka ọ dị ugbu a, a na-eji fiber OM5 mee ihe dị ka ụdị ọhụrụ nke multimode fiber.One nke azụmahịa azụmahịa kasị ukwuu bụ OM5 azụmahịa ikpe nke Changfei na China Railways Corporation's main data center.The data center na-aiming na ngwa uru nke Changfei. OM5 eriri na wavelength nkewa usoro nke SR4.2. Ọ na-enweta nkwurịta okwu ikike kachasị na ọnụ ala dị ala, ma na-akwado maka ọnụego nkwalite ọzọ n'ọdịnihu. A ga-abawanye ọnụego n'ọdịnihu na 100Gb/s ma ọ bụ ọbụna 400Gb. / s, ma ọ bụ ngwa wideband, enweghị ike dochie eriri eriri, na-ebelata ụgwọ ọrụ nkwalite n'ọdịnihu.
Nchịkọta: Dị ka ọchịchọ maka ngwa na-aga n'ihu na-arịwanye elu, eriri multimode na-aga n'ihu na nkwụsị ala dị ala, nnukwu bandwit, na multi-wavelength multiplexing. N'etiti ha, ngwa kachasị ike bụ fiber OM5, nke nwere arụmọrụ kachasị mma nke eriri multimode ugbu a. ma na-enye ihe ngwọta dị ike nke eriri maka usoro multi-wavelength nke 100Gb / s na 400Gb / s n'ọdịnihu. Tụkwasị na nke ahụ, iji mezuo ihe achọrọ nke ngwa ngwa dị elu, nnukwu bandwit, nkwurịta okwu data center dị ọnụ ala, multimode ọhụrụ. A na-emepụtakwa eriri, dị ka otu multimode n'ozuzu-ebumnuche eriri. N'ọdịnihu, Changfei ga-ewepụta ihe ọhụrụ multimode fiber ngwọta na ụlọ ọrụ ndị ọgbọ, na-eweta ọhụrụ ọganihu na obere ego na data centers na fiber optic interconnects.