Intshayelelo: Ifiber yonxibelelwano yahlulwe ibe yifiber yemowudi enye kunye nefiber yemultimode ngokwenani leendlela zokuhambisa phantsi kwesicelo sayo sobude be-wavelength.Ngenxa yobubanzi obungundoqo be-multimode fiber, ingasetyenziswa kunye nemithombo yokukhanya ephantsi.Ngoko ke, inoluhlu olubanzi lwezicelo kwiimeko zokuhanjiswa kwexesha elifutshane, njengamaziko edatha kunye nothungelwano lwendawo yendawo.Ngophuhliso olukhawulezayo lokwakhiwa kweziko ledatha kwiminyaka yamuva, i-multimode fiber, eyona nto iphambili kwiziko ledatha kunye nommandla wendawo. izicelo womnatha, uye wangenisa entwasahlobo, ebangela ukukhathazeka ngokubanzi.Namhlanje, makhe sithethe ngophuhliso ifayibha multimode.
Ngokutsho kwe-ISO / IEC 11801 esemgangathweni, i-multimode fiber ihlukaniswe kwiindidi ezinkulu ezintlanu: i-OM1, i-OM2, i-OM3, i-OM4, kunye ne-OM5. Imbalelwano yayo kunye ne-IEC 60792-2-10 iboniswe kwiThebhile 1.Phakathi kwabo i-OM1, i-OM2 ibhekisela kwi-fiber ye-62.5 / 125mm yendabuko kunye ne-50 / 125mm ye-multimode.I-OM3, i-OM4 kunye ne-OM5 ibhekisela kwi-50 / 125mm entsha ye-10 Gigabit fiber multimode.
Ekuqaleni:ifayibha yemultimode yemveli
Ukuphuhliswa kwefayibha ye-multimode kwaqala ngo-1970 kunye no-1980.Iifibers zangaphambili ze-multimode zibandakanya ubukhulu obuninzi, kunye neentlobo ezine zobukhulu ezibandakanyiweyo kwimigangatho ye-International Electrotechnical Commission (IEC) ibandakanya ezine. I-140 μm. Ngenxa yobukhulu obukhulu be-core cladding, ixabiso lokuvelisa liphezulu, ukugoba ukugoba kubi, inani leendlela zokuhambisa liyenyuka, kwaye i-bandwidth iyancitshiswa.Ke ngoko, uhlobo lobungakanani obukhulu bokugquma okungundoqo bushenxiswa ngokuthe ngcembe, kwaye iisayizi ezimbini eziphambili zokugquma zisenziwa ngokuthe ngcembe.Ziyi-50/125 μm kunye ne-62.5 / 125 μm, ngokulandelanayo.
Kwinethiwekhi yendawo yokuqala, ukuze kuncitshiswe iindleko zenkqubo yothungelwano lwengingqi kangangoko kunokwenzeka, i-LED enexabiso eliphantsi yayisetyenziswa ngokubanzi njengomthombo wokukhanya.Ngenxa yombane ophantsi wemveliso ye-LED, i-Angle yokuhlukana inkulu kakhulu. .Nangona kunjalo, i-diameter engundoqo kunye ne-aperture yamanani ye-50 / 125mm ye-fiber ye-multi-mode incinci, engabangeli ukudibanisa ngokufanelekileyo kunye ne-LED.Ngokuphathelele i-62.5 / 125mm i-fiber ye-multi-mode ene-core diameter enkulu kunye ne-aperture yamanani, amandla angaphezulu optical anokudityaniswa kwikhonkco ye-optical. Ngoko ke, i-50 / 125mm i-multimode fiber ayizange isetyenziswe ngokubanzi njenge-62.5 / 125mm i-multimode fiber phambi phakathi kwiminyaka yee-1990.
Ngokunyuka okuqhubekayo kwezinga lokudluliselwa kwe-LAN, ukususela ekupheleni kwekhulu lama-20, i-LAN iye yaphuhliswa ngaphezu kwezinga le-lGb / s.I-bandwidth ye-62.5 / 125μm i-multimode fiber kunye ne-LED njengomthombo wokukhanya ngokuthe ngcembe ayikwazi ukuhlangabezana neemfuno.Ngokwahlukileyo, i-50 / 125mm i-fiber multimode ine-aperture yamanani amancinci kunye nobubanzi obungundoqo, kunye neendlela zokuqhuba ezimbalwa.Ngoko ke, imowudi Ukusasazwa kwefiber ye-multi-mode iyancipha ngokufanelekileyo, kwaye i-bandwidth yanda kakhulu.Ngenxa yobukhulu obuncinci be-core, ixabiso lemveliso ye-50 / 125mm ye-fiber multi-mode nayo iphantsi, ngoko isetyenziswa ngokubanzi kwakhona.
Umgangatho we-IEEE 802.3z Gigabit Ethernet uchaza ukuba i-50 / 125mm i-multimode kunye ne-62.5 / 125mm ye-multimode fibers ingasetyenziswa njengemidiya yokudlulisa i-Gigabit Ethernet.Nangona kunjalo, kuthungelwano olutsha, i-50/125mm multimode fiber ikhethwa ngokubanzi.
Isibini:i-laser iphuculwe i-multimode fiber
Ngophuhliso lwethekhnoloji, i-850 nm VCSEL (i-Vertical Cavity Surface Emitting Laser) yavela.I-laser ze-VCSEL zisetyenziswa ngokubanzi kuba zinexabiso eliphantsi kunee-laser ze-long-wavelength kwaye zinokunyusa isantya senethiwekhi. i-laser ye-wavelength kwaye inokunyusa i-speeds yenethiwekhi.Ngenxa yokwahlukana phakathi kweentlobo ezimbini zezixhobo ezikhupha ukukhanya, i-fiber ngokwayo kufuneka iguqulwe ukuze ifake utshintsho kumthombo wokukhanya.
Kwiimfuno ze-laser zeVCSEL, i-International Organisation for Standardization / International Electrotechnical Commission (ISO / IEC) kunye ne-Telecommunications Industry Alliance (TIA) baye baqulunqa ngokudibeneyo umgangatho omtsha we-multimode fiber kunye ne-50mm core.ISO/IEC ihlela isizukulwana esitsha. yefiber multimode kwicandelo le-OM3 (i-IEC standard A1a.2) kwibakala layo elitsha lefiber multimode, eyi-laser-optimized multimode fiber.
I-fiber ye-OM4 elandelayo ngokwenene iyinguqu ephuculweyo ye-OM3 ye-multimode fiber.Xa kuthelekiswa ne-OM3 fiber, umgangatho we-OM4 uphucula kuphela i-fiber bandwidth index.Oko kukuthi, umgangatho we-OM4 wefayibha uye waphucula i-mode mode bandwidth (EMB) kunye ne-injection bandwidth epheleleyo. (OFL) kwi-850 nm xa kuthelekiswa ne-OM3 fiber.Njengoko kubonisiwe kuTheyibhile 2 ngezantsi.
Zininzi iindlela zothumelo kwifayibha yemultimode, kwaye ingxaki yokugoba ukugoba ifayibha iyaziswa.Xa i-fiber igobile, imowudi yomyalelo ophezulu ivuza ngokulula, ibangele ukulahlekelwa ngumqondiso, oko kukuthi, ukugoba ukulahlekelwa kwefiber.Ngokwanda kwenani leemeko zesicelo sangaphakathi, i-wiring ye-multimode fiber kwindawo emxinwa ibeke. phambili iimfuno eziphezulu zokumelana nokugoba kwayo.
Ngokungafaniyo neprofayili yesalathiso esilula serefractive yefiber yemowudi enye, iprofayile yerefractive index yemultimode fiber intsonkothe kakhulu, ifuna uyilo lweprofayili yesalathiso esulungekileyo kunye nenkqubo yokuyila. olona lungiso luchanekileyo lwefiber yemultimode yinkqubo yeplasma chemical deposition (PCVD) emelwe yiChangfei Company. Le nkqubo iyahluka kwezinye iinkqubo kuba inomaleko wokubekelwa ecaleni kwamawaka aliqela kunye nobukhulu obumalunga ne-1 micron umaleko ngexesha. ideposition, eyenza ukuba i-ultra-fine refractive index curve control ifikelele kwi-bandwidth ephezulu.
Ngokulungisa iprofayili yesalathiso se-refractive yefiber ye-multimode, i-fiber ye-multimode egobileyo iphucula kakhulu ukuxhathisa ukugoba, njengoko kuboniswe kuMfanekiso 1 ngezantsi.
Umzobo.1 Ukuthelekisa ukusebenza kwe-macrobend phakathi kwe-multimode fiber egoba kunye ne-multimode fiber eqhelekileyo.
Isithathu:ifayibha yemultimode entsha (OM5)
I-OM3 ifayibha kunye ne-OM4 ifayibha i-multimode ifayibha esetyenziswa kakhulu kwi-850nm band.Njengoko izinga lokudluliselwa liqhubeka nokunyuka, kuphela idizayini yebhendi ye-channel enye iya kubangela iindleko ezingaphezulu nangakumbi zocingo, kwaye iindleko zokulawula kunye nokugcinwa okuhambelana nazo ziya kunyuka ngokufanelekileyo. .Ngoko ke, amagcisa azama ukwazisa i-wavelength division multiplexing concept kwi-multimode transmission system.Ukuba amaza amaninzi angathunyelwa kwifiber enye, inani elihambelanayo lefayibha ehambelanayo kunye neendleko zokubeka kunye nokugcinwa kunokunciphisa kakhulu.Kulo mongo, i-OM5 fiber yavela.
I-OM5 i-fiber ye-multimode isekelwe kwi-OM4 fiber, eyandisa i-channel-bandwidth ephezulu kwaye ixhasa ukuhanjiswa kwezicelo ukusuka kwi-850nm ukuya kwi-950nm.Izicelo eziqhelekileyo zangoku ziyi-SWDM4 kunye ne-SR4.2 yoyilo.I-SWDM4 yi-wavelength division multiplexing yamaza amane amafutshane, angama-850 nm, i-880 nm, i-910 nm, kunye ne-940 nm, ngokulandelanayo.Ngale ndlela, i-fiber optical inokuxhasa iinkonzo ezine zangaphambili ze-fiber optical fibers.I-SR4.2 i-multiple-wavelength division multiplexing, ngokukodwa isetyenziselwa iteknoloji ye-bidirectional ye-fiber enye.I-OM5 inokuthi ihambelane ne-laser ye-VCSEL kunye nokusebenza okuphantsi kunye neendleko eziphantsi ukuhlangabezana kangcono nonxibelelwano olufutshane olufana namaziko edatha.Itheyibhile 3 engezantsi i ukuthelekiswa kweenkcukacha eziphambili ze-bandwidth ye-OM4 kunye ne-OM5 fibers.
Okwangoku, i-OM5 fiber isetyenziswe njengohlobo olutsha lwe-fiber multimode ephezulu.Enye yeemeko ezinkulu zoshishino yimeko yezorhwebo ye-OM5 ye-Changfei kunye ne-China Railways Corporation yedatha yedatha.Iziko ledatha lijolise kwiinzuzo zokusetyenziswa I-OM5 ifayibha kwinkqubo yolwahlulo lwamaza e-SR4.2.Ifikelela ubuninzi bonxibelelwano ngexabiso eliphantsi, kwaye ilungiselela ireyithi yokuphucula ngakumbi kwixesha elizayo.Izinga lexesha elizayo liya kunyuswa ukuya kwi-100Gb / s okanye nakwi-400Gb./s, okanye izicelo ezibanzi, azinakuphinda zithathe indawo yefiber, zinciphisa kakhulu iindleko zokuphucula kwixesha elizayo.
Isishwankathelo: Njengoko imfuno yezicelo iqhubeka nokunyuka, i-multimode fiber ihambela ekulahlekeni kwe-bend ephantsi, i-bandwidth ephezulu, kunye ne-multi-wavelength multiplexing.Phakathi kwabo, isicelo esinamandla kakhulu yi-OM5 fiber, enokusebenza ngokufanelekileyo kwe-multimode fiber yangoku, kwaye ibonelela ngesisombululo sefiber esinamandla kwiinkqubo ezininzi ze-wavelength ze-100Gb / s kunye ne-400Gb / s kwixesha elizayo.Ukongezelela, ukuze kuhlangatyezwane neemfuno ze-high-speed, i-high-bandwidth, i-data-data center communication center, i-multimode entsha. Iifibers, ezifana ne-multimode enye yee-fibers zenjongo jikelele, nazo ziyaphuhliswa.Kwixesha elizayo, i-Changfei iya kusungula izisombululo ezintsha ze-multimode fiber kunye noontanga beshishini, ukuzisa impumelelo entsha kunye neendleko eziphantsi kumaziko edatha kunye ne-fiber optic interconnects.