Foreword: Kukurukurirana fiber yakakamurwa kuva single mode fiber uye multimode fiber maererano nenhamba yekutumira modes pasi pekushandiswa kwayo wavelength.Nekuda kwehukuru hwepakati dhayamita ye multimode fiber, inogona kushandiswa nemutengo wakaderera magetsi.Nokudaro, ine huwandu hwakawanda hwekushandiswa mumamiriro ekufambisa kwenguva pfupi, zvakadai se data data uye nzvimbo dzenharaunda.Nekukurumidza kukurumidza kwekuvaka data data mumakore achangopfuura, multimode fiber, iyo inonyanya kushandiswa kwedata data uye nzvimbo yemunharaunda. network applications, yakaunzawo muchirimo, zvichikonzera kushushikana kwakapararira.Nhasi, ngatitaure nezvekuvandudzwa kwemultimode fiber.
Maererano nechiyero che ISO/IEC 11801, multimode fiber yakakamurwa kuva mapoka makuru mashanu: OM1, OM2, OM3, OM4, uye OM5.Kunyorerana kwayo neIEC 60792-2-10 kunoratidzwa muTebhu 1.Pakati pavo OM1, OM2 inoreva chinyakare 62.5/125mm uye 50/125mm multimode faibha.OM3, OM4 uye OM5 inoreva iyo itsva 50/125mm 10 Gigabit multimode fiber.
Chekutanga:iyo yechinyakare multimode fiber
Kuvandudzwa kwemultimode fiber kwakatanga muma1970 nema1980.Early multimode fibers yaisanganisira hukuru hwakawanda, uye mana emhando dzehukuru dzakabatanidzwa muInternational Electrotechnical Commission (IEC) mitemo yaisanganisira ina. Iyo core cladding diameter yakakamurwa kuva 50/125 μm, 62.5/125 μm, 85/125 μm, uye 100/ 140 μm.Nekuda kwehukuru hukuru hwekuvharira kwepakati, mutengo wekugadzira wakakwira, kushomeka kwekukotama kwakashata, nhamba yemamodhi ekutumira inowedzerwa, uye bandwidth inoderedzwa.Naizvozvo, iyo mhando yehukuru hwepakati cladding saizi inobviswa zvishoma nezvishoma, uye maviri makuru epakati epakati epakati saizi anoumbwa zvishoma nezvishoma.Iwo ari 50/125 μm uye 62.5/125 μm, zvichiteerana.
Mukutanga kwenharaunda yenharaunda network, kuitira kuti kuderedze mutengo wehurongwa hwenzvimbo yenzvimbo network zvakanyanya sezvinobvira, LED inodhura yaiwanzoshandiswa sechiedza chechiedza.Nekuda kwekuderera kwe LED kubuda simba, Divergence Angle yakakura. .Nekudaro, iyo yepakati dhayamita uye manhamba aperture ye50/125mm multi-mode faibha idiki, iyo isingakodzeri kubatanidza kwakanaka ne LED.Kana iri 62.5 / 125mm multi-mode fiber ine guru guru repakati uye nhamba yekuvhura kwenhamba, simba rakawanda remaziso rinogona kubatanidzwa kune optical link. Nokudaro, 50 / 125mm multimode fiber yakanga isingashandisi zvakanyanya se62.5 / 125mm multimode fiber isati yasvika. pakati pema1990.
Nekuenderera mberi kwekuwedzera kweLAN transmission rate, kubva pakupera kwezana ramakore rechi20, iyo LAN yakagadziridzwa pamusoro peiyo lGb/s chiyero.Iyo bandwidth ye62.5 / 125μm multimode fiber ine LED sechiedza chechiedza chinongotadza zvishoma nezvishoma kuzadzisa zvinodiwa.Kusiyana, iyo 50/125mm multimode fiber ine diki nhamba aperture uye core diameter, uye mashoma conduction modes.Naizvozvo, iyo mode. kupararira kwe-multi-mode fiber inonyatso kuderedzwa, uye bandwidth inowedzera zvakanyanya.Nekuda kweiyo dhayamita yepakati, mutengo wekugadzira we50/125mm multi-mode fiber zvakare yakadzikira, saka inoshandiswa zvakanyanya zvakare.
Iyo IEEE 802.3z Gigabit Ethernet chiyero inotsanangura kuti 50/125mm multimode uye 62.5/125mm multimode fibers inogona kushandiswa sekutumira midhiya yeGigabit Ethernet.Nekudaro, kune ma network matsva, 50/125mm multimode fiber inowanzo kufarirwa.
Chepiri:Laser optimized multimode fiber
Nekuvandudzwa kwemichina, 850 nm VCSEL (Vertical Cavity Surface Emitting Laser) yakaonekwa. VCSEL lasers inoshandiswa zvakanyanya nokuti yakachipa kudarika marefu-wavelength lasers uye inogona kuwedzera network speed.VCSEL lasers inoshandiswa zvakanyanya nokuti inodhura kupfuura yakareba- wavelength lasers uye inogona kuwedzera network kumhanya.Nekuda kwekusiyana pakati pemhando mbiri dzemwenje-emitting zvishandiso, iyo fiber pachayo inofanirwa kugadziridzwa kuti igadzirise shanduko muchiedza sosi.
Nekuda kwezvido zveVCSEL lasers, International Organisation for Standardization/International Electrotechnical Commission (ISO/IEC) neTelecommunications Industry Alliance (TIA) vakabatana vakanyora chiyero chitsva chemultimode fiber ine 50mm core.ISO/IEC inoronga chizvarwa chitsva. ye multimode faibha muchikamu cheOM3 (IEC standard A1a.2) mune yayo itsva multimode fiber giredhi, iri laser-optimized multimode fiber.
Iyo inotevera OM4 fiber ndeyechokwadi yakagadziridzwa shanduro yeOM3 multimode fiber.Kuenzaniswa neOM3 fiber, chiyero cheOM4 chinongovandudza fiber bandwidth index.Ndiko kuti, OM4 fiber standard yakagadzirisa maitiro anobudirira bandwidth (EMB) uye full injection bandwidth. (OFL) pa850 nm ichienzaniswa neOM3 fiber.Sezvinoratidzwa muTable 2 pazasi.
Kune akawanda nzira dzekutapurirana mumultimode fiber, uye dambudziko rekukotama kuramba kwefiber rinounzwa zvakare.Kana iyo fiber yakakotama, iyo yepamusoro-yekurongeka modhi inodonha zviri nyore, zvichikonzera kurasikirwa kwechiratidzo, ndiko kuti, kukotama kurasikirwa kwefiber.Nekuwedzera kwenhamba yemamiriro ekushandiswa kwemukati, wiring ye multimode fiber munzvimbo yakamanikana yakaisa. mberi yakakwirira zvinodiwa nokuda kwayo kukotama kuramba.
Kusiyana neinoreruka refractive index profile ye single-mode fiber, iyo refractive index profile ye multimode fiber yakaoma kwazvo, inoda yakanyanya kunaka refractive index profile dhizaini uye yekugadzira maitiro. Kunyatso gadzirira kwe multimode fiber i plasma chemical weather deposition (PCVD) process, inomiririrwa neChangfei Company.Iyi nzira inosiyana nemamwe maitirwo ekuti ine deposition layer yezviuru zvakati wandei uye ukobvu hunosvika 1 micron per layer panguva. deposition, ichigonesa ultra-fine refractive index curve control kuti iwane yakakwira bandwidth.
Nekugadzirisa iyo refractive index profile ye multimode fiber, iyo bending-insensitive multimode fiber ine kuvandudzwa kwakakosha mukupeta kuramba, sezvakaratidzwa muFigure 1 pazasi.
Fig.1 Kuenzanisa kwekuita macrobend pakati pekukotama-resistant multimode fiber uye yakajairika multimode fiber.
Chetatu:iyo itsva multimode fiber (OM5)
OM3 fiber uye OM4 fiber ine multimode fiber inonyanya kushandiswa mu 850nm band.Sezvo chiyero chekufambisa chinoramba chichiwedzera, chete-channel-channel band design ichaita kuti iwedzere kuwedzera uye yakawedzera mari ye wiring, uye iyo inobatanidza hutungamiri nekugadzirisa mari ichawedzera maererano. .Saka, nyanzvi dzinoedza kuunza pfungwa yewavelength division multiplexing mu multimode transmission system.Kana mawavelength akawanda anogona kuendeswa pane imwe fiber, nhamba inowirirana yefiber yakaenzana uye mari yekuisa nekugadzirisa inogona kuderedzwa zvikuru.Muchirevo ichi, OM5 fiber yakatanga.
OM5 multimode fiber inobva pa OM4 fiber, iyo inowedzera chiteshi chepamusoro-bandwidth uye inotsigira kushandiswa kwekutumira kubva ku850nm kusvika ku950nm. Izvo zvino zvikumbiro zvemazuva ano ndezve SWDM4 uye SR4.2 magadzirirwo.SWDM4 iwavelength division multiplexing yemafungu mana mapfupi, ayo ari 850 nm, 880 nm, 910 nm, uye 940 nm, maererano.Nenzira iyi, optical fiber inogona kutsigira masevhisi ekare mana akaenzana optical fibers.SR4.2 inonzi-wavelength division multiplexing, inonyanya kushandiswa kune imwe-fiber bidirectional teknolojia.Iyo OM5 inogona kufananidzwa neVCSEL lasers nekushanda kwakaderera uye mari shoma kuti iite zviri nani kutaurirana kwenguva pfupi se data centers.Tafura 3 iri pasi apa ndiyo kuenzanisa kweiyo huru bandwidth yakatarwa yeOM4 uye OM5 fibers.
Parizvino, OM5 fiber yakashandiswa semhando itsva ye-high-end multimode fiber.Imwe yematare makuru ebhizinesi ndeye OM5 yekutengesa nyaya yeChangfei uye China Railways Corporation's main data center.Data data inotarisa kune zvibatsiro zvekushandisa OM5 faibha muwavelength division system yeSR4.2.Iyo inowana iyo yakanyanya kugona kutaurirana pamutengo wakaderera, uye inogadzirira imwe nhanho yekusimudzira mune ramangwana.Mwero weramangwana uchawedzerwa kusvika ku100Gb/s kana kunyange 400Gb./s, kana wideband application, haichakwanisa kutsiva fiber, ichideredza zvakanyanya mari yekuvandudza mune ramangwana.
Summary: Sezvo kudiwa kwezvikumbiro kuri kuramba kuchiwedzera, multimode fiber inofamba ichienda kune yakaderera bend kurasikirwa, yakakwirira bandwidth, uye yakawanda-wavelength multiplexing.Pakati pavo, iyo inonyanya kushandiswa ndeye OM5 fiber, iyo ine optimal performance yezvino multimode fiber, uye inopa ine simba fiber solution ye-multi-wavelength systems ye100Gb / s uye 400Gb / s mune ramangwana.Kuwedzera, kuitira kuti zvizadzise zvinodiwa nepamusoro-soro, yakakwirira-bandwidth, yakaderera-inodhura data center communication, itsva multimode. Fibers, dzakadai se single multimode general-purpose fibers, dziri kugadzirwa zvakare.Mune ramangwana, Changfei ichavhura mamwe ma multimode fiber mhinduro neveindasitiri vezera, ichiunza budiriro itsva uye yakaderera mutengo kunzvimbo dzedata uye fiber optic interconnects.