Selelekela: Fiber ea puisano e arotsoe ka mokhoa o le mong oa fiber le fiber ea multimode ho ea ka palo ea mekhoa ea phetisetso tlas'a ts'ebeliso ea eona ea wavelength.Ka lebaka la bophara bo boholo ba motheo oa fiber ea multimode, e ka sebelisoa ka mehloli ea leseli e theko e tlaase.Ka hona, e na le mefuta e mengata ea likopo maemong a phetisetso ea nako e khuts'oane, joalo ka litsi tsa data le marang-rang a sebaka sa lehae.Ka nts'etsopele e potlakileng ea kaho ea setsi sa data lilemong tsa morao tjena, fiber ea multimode, e leng eona e ka sehloohong ea setsi sa data le sebaka sa lehae. lisebelisoa tsa marang-rang, e boetse e kentse nakong ea selemo, e bakang ngongoreho e atileng.Kajeno, a re bueng ka nts'etsopele ea fiber ea multimode.
Ho ea ka tlhaloso e tloaelehileng ea ISO/IEC 11801, fiber ea multimode e arotsoe ka mekhahlelo e mehlano e meholo: OM1, OM2, OM3, OM4, le OM5. Ngollano ea eona le IEC 60792-2-10 e bontšoa ho Lethathamo la 1. Har'a tsona OM1, OM2 e bua ka fiber ea setso ea 62.5/125mm le 50/125mm multimode.OM3, OM4 le OM5 li bua ka fiber e ncha ea 50/125mm 10 Gigabit multimode.
Ea pele:fiber ea setso ea multimode
Nts'etsopele ea fiber ea multimode e qalile ka bo-1970 le bo-1980.Likhoele tsa pele tsa multimode li ne li kenyelletsa boholo bo bongata, 'me mefuta e mene ea boholo bo kenyelelitsoeng litekanyetso tsa International Electrotechnical Commission (IEC) e kenyelelitse tse' nè. The core cladding diameter e arotsoe ka 50 / 125 μm, 62.5 / 125 μm, 85 / 125 μm, le 100 / 140 μm. Ka lebaka la boholo bo boholo ba sekoahelo sa mantlha, litšenyehelo tsa tlhahiso li phahame, ho hanyetsa ho khumama ho fokola, palo ea mekhoa ea phetisetso e eketseha, 'me bandwidth e fokotsehile.Ka hona, mofuta oa boholo bo boholo ba li-core cladding o tlosoa butle-butle, 'me boholo ba likoti tse peli tsa mantlha li thehoa butle-butle.Ke 50/125 μm le 62.5/125 μm, ka ho latellana.
Sebakeng sa pele sa marang-rang sa sebaka seo, e le ho fokotsa litšenyehelo tsa tsamaiso ea marang-rang a sebaka sa sebaka seo ka hohle kamoo ho ka khonehang, LED e theko e tlaase e ne e sebelisoa ka kakaretso e le mohloli o khanyang. .Leha ho le joalo, bophara ba mantlha le phallo ea lipalo ea fiber ea mefuta e mengata ea 50/125mm e batla e le nyane, e sa thuseng ho hokahana hantle le LED.Ha e le fiber e nang le mefuta e mengata ea 62.5 / 125mm e nang le bophara bo boholo ba mantlha le phallo ea lipalo, matla a eketsehileng a optical a ka kopanngoa le optical link. bohareng ba bo-1990.
Ka keketseho e tsoelang pele ea sekhahla sa phetisetso ea LAN, ho tloha bofelong ba lekholo la bo20 la lilemo, LAN e ntlafalitsoe ka holimo ho sekhahla sa lGb/s.The bandwidth ea 62.5 / 125μm multimode fiber e nang le LED e le mohloli oa leseli butle-butle ha e khone ho finyella litlhoko.Ka lehlakoreng le leng, fiber ea multimode ea 50 / 125mm e na le sebaka se senyenyane sa palo le bophara ba mantlha, le mekhoa e fokolang ea ho khanna. Ho hasana ha fiber ea mefuta e mengata ho fokotsehile ka katleho, 'me bandwidth e eketseha haholo.Ka lebaka la bophara bo bonyenyane ba mantlha, theko ea tlhahiso ea 50/125mm multi-mode fiber le eona e tlase, kahoo e sebelisoa haholo hape.
Tekanyetso ea IEEE 802.3z Gigabit Ethernet e bolela hore 50/125mm multimode le 62.5/125mm multimode fibers e ka sebelisoa e le mecha ea phatlalatso ea Gigabit Ethernet.Leha ho le joalo, bakeng sa marang-rang a macha, fiber ea multimode ea 50/125mm hangata e khethoa.
Ea bobeli:laser optimized multimode fiber
Ka nts'etsopele ea thekenoloji, 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) e ile ea hlaha. Li-lasers tsa VCSEL li sebelisoa haholo hobane li theko e tlaase ho feta mahlaseli a nako e telele 'me li ka eketsa lebelo la marang-rang.VCSEL lasers e sebelisoa haholo hobane e theko e tlaase ho feta nako e telele- lasers ea wavelength 'me e ka eketsa lebelo la marang-rang.Ka lebaka la phapang pakeng tsa mefuta e' meli ea lisebelisoa tse hlahisang leseli, fiber ka boeona e tlameha ho fetoloa hore e lumellane le liphetoho mohloling oa leseli.
Bakeng sa litlhoko tsa li-lasers tsa VCSEL, International Organization for Standardization/International Electrotechnical Commission (ISO/IEC) le Telecommunications Industry Alliance (TIA) li kopanetse ho ngola tekanyetso e ncha ea fiber ea multimode e nang le 50mm core.ISO/IEC e beha moloko o mocha. ea multimode fiber sehlopheng sa OM3 (IEC standard A1a.2) sehlopheng sa eona se secha sa fiber multimode, e leng laser-optimized multimode fiber.
Fiber e latelang ea OM4 ha e le hantle ke phetolelo e ntlafalitsoeng ea fiber ea multimode ea OM3. Ha e bapisoa le fiber ea OM3, tekanyo ea OM4 e ntlafatsa feela fiber bandwidth index.Ke hore, tekanyo ea fiber ea OM4 e ntlafalitse mokhoa o sebetsang oa bandwidth (EMB) le tekanyo e feletseng ea ente. (OFL) ho 850 nm ha e bapisoa le fiber ea OM3.Joalokaha ho bontšitsoe ho Lethathamo la 2 ka tlase.
Ho na le mekhoa e mengata ea phetiso ka fiber ea multimode, 'me bothata ba ho kobeha khanyetso ea fiber le bona bo tlisoa.Ha fiber e kobehile, mokhoa oa maemo a holimo o lutla habonolo, o baka tahlehelo ea lets'oao, ke hore, tahlehelo e kobehang ea fiber. fetisetsa litlhoko tse phahameng bakeng sa khanyetso ea eona ea ho kobeha.
Ho fapana le profil e bonolo ea index ea mofuta o le mong, profil ea refractive index ea multimode fiber e rarahane haholo, e hlokang moralo o motle haholo oa profil ea index le mokhoa oa ho etsa. Tokiso e nepahetseng ka ho fetesisa ea fiber ea multimode ke ts'ebetso ea plasma chemical weather deposition (PCVD), e emeloang ke Changfei Company. Ts'ebetso ena e fapana le lits'ebetso tse ling ka hore e na le lera la deposition la lihlopha tse likete tse 'maloa le botenya bo ka bang 1 micron ka lera nakong. deposition, e nolofalletsang ultra-fine refractive index curve control ho fihlela bandwidth e phahameng.
Ka ho ntlafatsa profil ea refractive index ea fiber ea multimode, fiber ea multimode e sa utloeng bohloko e na le ntlafatso e kholo ea ho hanyetsa ho kobeha, joalo ka ha ho bonts'itsoe ho Setšoantšo sa 1 ka tlase.
Fig.1 Papiso ea ts'ebetso ea macrobend lipakeng tsa fiber e sa tsitsang ea multimode le fiber e tloaelehileng ea multimode.
Ea boraro:fiber e ncha ea multimode (OM5)
Fiber ea OM3 le fiber ea OM4 ke fiber ea multimode e sebelisoang haholo-holo sehlopheng sa 850nm. Ha lebelo la phetisetso le ntse le eketseha, ke moralo o le mong feela oa mochine o tla etsa hore ho be le litšenyehelo tse ngata tsa ho kenya mohala, 'me litšenyehelo tse amanang le tsamaiso le tlhokomelo li tla eketseha ka tsela e nepahetseng. .Ka hona, litsebi li leka ho kenyelletsa mohopolo oa ho arola oavelength ka har'a sistimi ea phetisetso ea multimode.Haeba maqhubu a mangata a ka fetisoa ka fiber e le 'ngoe, palo e lekanang ea fiber e ts'oanang le litšenyehelo tsa ho beha le ho hlokomela li ka fokotsoa haholo.
Fiber ea multimode ea OM5 e thehiloe ho fiber ea OM4, e atolosang mocha o phahameng oa li-bandwidth 'me e tšehetsa likopo tsa phetisetso ho tloha 850nm ho ea ho 950nm. Lisebelisoa tse tloaelehileng tsa morao-rao ke SWDM4 le SR4.2 meralo.SWDM4 ke wavelength division multiplexing ea maqhubu a mane a khutšoanyane, e leng 850 nm, 880 nm, 910 nm, le 940 nm, ka ho latellana.SR4.2 ke "multiple wavelength division" tse ngata, tse sebelisoang haholo-holo bakeng sa thekenoloji e le 'ngoe ea fiber bidirectional.The OM5 e ka kopanngoa le lasers ea VCSEL e nang le ts'ebetso e tlaase le litšenyehelo tse tlaase ho finyella hantle puisano ea nako e khutšoanyane e kang litsi tsa data.Letlapa la 3 le ka tlase ke papiso ea lintlha tse ka sehloohong tsa li-bandwidth tsa OM4 le OM5 fibers.
Hona joale, fiber ea OM5 e 'nile ea sebelisoa e le mofuta o mocha oa fiber ea multimode e phahameng.E' ngoe ea linyeoe tse kholo ka ho fetisisa tsa khoebo ke nyeoe ea khoebo ea OM5 ea Changfei le China Railways Corporation ea setsi sa boitsebiso se seholo.Setsi sa data se ikemiselitse melemo ea kopo ea OM5 fiber tsamaisong ea karohano ea maqhubu a maqhubu a SR4.2.E fihlella boholo ba puisano ea bokhoni ka litšenyehelo tse tlase, 'me e itokisetsa sekhahla sa ntlafatso nakong e tlang.Sekhahla sa nakong e tlang se tla eketsoa ho 100Gb / s kapa esita le 400Gb./s, kapa li-wideband applications, ha li sa khona ho nka sebaka sa fiber, ho fokotsa haholo litšenyehelo tsa ntlafatso ea nako e tlang.
Kakaretso: Ha tlhokahalo ea likopo e ntse e eketseha, fiber ea multimode e ntse e lebisa ho tahlehelo e tlaase ea bend, bandwidth e phahameng, le multiplexing ea maqhubu a mangata. Har'a bona, kopo e ka sebelisoang ka ho fetisisa ke OM5 fiber, e nang le ts'ebetso e nepahetseng ea fiber ea multimode hona joale, mme e fana ka tharollo e matla ea fiber bakeng sa mekhoa e mengata ea maqhubu a 100Gb / s le 400Gb / s nakong e tlang. Ho phaella moo, e le ho finyella litlhoko tsa puisano e potlakileng, e phahameng, e theko e tlaase, e theko e tlaase, multimode e ncha. Likhoele, tse kang li-single multimode-purpose-purpose fibers, le tsona li ntse li ntlafatsoa.Nakong e tlang, Changfei e tla hlahisa litharollo tse ncha tsa multimode fiber le lithaka tsa indasteri, ho tlisa katleho e ncha le litšenyehelo tse tlaase ho litsi tsa data le li-fiber optic interconnects.