ʻŌlelo mua: Hoʻokaʻawale ʻia ka pulupulu kamaʻilio i ka fiber mode hoʻokahi a me ka fiber multimode e like me ka helu o nā ʻano hoʻoili ma lalo o kāna nalu hawewe noi.No laila, he ākea ka nui o nā noi i nā hiʻohiʻona hoʻouna pōkole, e like me nā kikowaena data a me nā pūnaewele wahi kūloko. nā noi pūnaewele, ua hoʻomaka pū i ka pūnāwai, e hoʻonui nui ai i ka hopohopo. I kēia lā, e kamaʻilio e pili ana i ka hoʻomohala ʻana o ka fiber multimode.
E like me ka ISO / IEC 11801 kiko'ī, ua māheleʻia ka fiber multimode iʻelima mauʻano nui: OM1, OM2, OM3, OM4, a me OM5. Ua hōʻikeʻia kona pilina me IEC 60792-2-10 ma ka Papa 1. Ma waena o lākou OM1, OM2 pili i ka 62.5/125mm a me 50/125mm multimode fiber.ʻO OM3, OM4 a me OM5 e pili ana i ka fiber 50/125mm 10 Gigabit multimode hou.
Ka mua:ʻo ka fiber multimode maʻamau
Ua hoʻomaka ka hoʻomohala ʻana o ka fiber multimode i nā makahiki 1970 a me 1980.Early multimode fibers i komo i na nui nui, a eha ano o ka nui i komo i loko o ka International Electrotechnical Commission (IEC) nā kūlana i loaʻa eha.The core cladding anawaena ua maheleia i 50/125 μm, 62.5/125 μm, 85/125 μm, a me 100 / 140 μm. Ma muli o ka nui nui o ka pale kumu, ʻoi aku ka kiʻekiʻe o ke kumukūʻai hana, maikaʻi ʻole ke kūlou ʻana, hoʻonui ʻia ka nui o nā ʻano hoʻouna, a hoʻemi ʻia ka bandwidth.No laila, ua hoʻopau mālie ʻia ke ʻano o ka nui o ka ʻili nui, a ua hoʻokumu ʻia nā ʻano nui ʻelua.ʻO lākou ka 50/125 μm a me 62.5/125 μm.
I ka wā mua o ka pūnaewele puni honua, i mea e hōʻemi ai i ke kumukūʻai ʻōnaehana o ka pūnaewele wahi kūloko e like me ka hiki, ua hoʻohana ʻia kahi LED haʻahaʻa haʻahaʻa ma ke ʻano he kumu kukui. .Eia nō naʻe, liʻiliʻi ke anawaena kumu a me ka puka helu o ka 50/125mm multi-mode fiber, ʻaʻole kūpono i ka hoʻopili pono ʻana me LED.No ka 62.5 / 125mm multi-mode fiber me ka nui o ke anawaena kumu a me ka puka helu, hiki ke hoʻohui ʻia ka mana optical i ka loulou optical. waena o 1990s.
Me ka hoʻonui mau ʻana o ka hoʻouna ʻana o LAN, mai ka hopena o ke kenekulia 20, ua kūkulu ʻia ka LAN ma luna o ka helu lGb/s.ʻO ka bandwidth o 62.5 / 125μm multimode fiber me LED e like me ke kumu kukui i hiki ʻole ke hoʻokō i nā koi. Ma ka hoʻohālikelike ʻana, ʻo ka 50 / 125mm multimode fiber he liʻiliʻi liʻiliʻi aperture a me ke anawaena kumu, a he liʻiliʻi nā modes conduction. Hoʻemi maikaʻi ʻia ka hoʻopuehu ʻana o ka fiber multi-mode, a ua hoʻonui nui ʻia ka bandwidth.Ma muli o ke anawaena kumu liʻiliʻi, ʻoi aku ka haʻahaʻa o ke kumu kūʻai o 50/125mm multi-mode fiber, no laila ua hoʻohana hou ʻia.
Hōʻike ka IEEE 802.3z Gigabit Ethernet maʻamau he 50/125mm multimode a me 62.5/125mm multimode fibers hiki ke hoʻohana ʻia ma ke ʻano he media hoʻouna no Gigabit Ethernet.Eia nō naʻe, no nā pūnaewele hou, makemake nui ʻia ka 50/125mm multimode fiber.
Ka lua:ʻo ka fiber multimode i hoʻopaʻa ʻia i ka laser
Me ka hoʻomohala ʻana o ka ʻenehana, ua ʻike ʻia ʻo 850 nm VCSEL (Vertical Cavity Surface Emitting Laser). nā laser lōʻihi hawewe a hiki ke hoʻonui i ka wikiwiki o ka pūnaewele.
No nā pono o nā lasers VCSEL, ua hui pū ka International Organization for Standardization / International Electrotechnical Commission (ISO / IEC) a me ka Telecommunications Industry Alliance (TIA) i kahi kūlana hou no ka fiber multimode me kahi 50mm core. o ka multimode fiber i loko o ka OM3 waeʻano (IEC maʻamau A1a.2) i kona hou multimode fiber grade, he laser-optimized multimode fiber.
ʻO ka fiber OM4 ma hope mai he hōʻano hou o OM3 multimode fiber. Hoʻohālikelike ʻia me ka fiber OM3, hoʻomaikaʻi wale ka standard OM4 i ka fiber bandwidth index. (OFL) ma 850 nm i hoʻohālikelike ʻia me ka fiber OM3.E like me ka hoike ana ma ka Papa 2 malalo.
Nui nā ʻano o ka hoʻouna ʻana i ka fiber multimode, a ua lawe pū ʻia ka pilikia o ka pale ʻana o ka fiber.I ka wā e piʻo ai ka fiber, ua maʻalahi ka leʻaleʻa o ke ʻano kiʻekiʻe, e hopena i ka nalowale o ka hōʻailona, ʻo ia hoʻi, ka nalo ʻana o ka fiber. i mua i nā koi kiʻekiʻe no kona kūpaʻa ʻana.
'A'ole e like me ka ma'alahi o ka ho'opa'a 'ana i ka 'ano o ka fiber ho'okahi, he pa'akikī loa ka 'ōlelo kuhikuhi refractive o ka fiber multimode, e koi ana i ka ho'olālā a me ke ka'ina hana. ʻO ka hoʻomākaukau pono loa ʻana o ka fiber multimode ʻo ia ke kaʻina plasma chemical weather deposition (PCVD), i hōʻike ʻia e Changfei Company. He ʻokoʻa kēia kaʻina hana mai nā kaʻina hana ʻē aʻe i loaʻa iā ia kahi papa deposition o kekahi mau kaukani papa a me ka mānoanoa o 1 micron wale nō i kēlā me kēia papa i ka wā. deposition, hiki i ka ultra-fine refractive index curve control to reach high bandwidth.
Ma ka hoʻopololei ʻana i ka ʻaoʻao helu kuhikuhi o ka fiber multimode, ʻoi aku ka hoʻomaikaʻi nui ʻana o ka fiber multimode bending-insensitive i ka pale ʻana, e like me ka hōʻike ʻana ma ke Kiʻi 1 ma lalo nei.
Fig.1 Ka hoʻohālikelike o ka hana macrobend ma waena o ka fiber multimode kūpaʻa kūlou a me ka fiber multimode maʻamau.
Ke kolu:ka hou multimode fiber (OM5)
ʻO ka OM3 fiber a me ka OM4 fiber he multimode fiber i hoʻohana nui ʻia i ka band 850nm. Ke hoʻomau nei ka piʻi ʻana o ka hoʻouna ʻana, ʻo kahi hoʻolālā band hoʻokahi wale nō e hopena i nā kumukūʻai uea ʻoi aku ka ikaika, a e hoʻonui ʻia nā kumukūʻai pili a me ka mālama ʻana. .No laila, ho'āʻo ka poʻe ʻenehana e hoʻolauna i ka manaʻo multiplexing māhele hawewe i loko o ka ʻōnaehana hoʻoili multimode.Inā hiki ke hoʻouna ʻia nā lōʻihi hawewe he nui ma ka fiber hoʻokahi, hiki ke hoʻemi nui ʻia ka helu kūpono o ka fiber parallel a me ke kumukūʻai o ka waiho ʻana a me ka mālama ʻana.
Hoʻokumuʻia ka fiber multimode OM5 ma luna o ka fiber OM4, ka mea e hoʻonui i ke kahawai kiʻekiʻe-bandwidth a kākoʻo i nā noi hoʻouna mai ka 850nm a hiki i ka 950nm. ʻO nā mea nui o kēia manawaʻo SWDM4 a me SR4.2 hoʻolālā.ʻO SWDM4 kahi hawewe hawewe multiplexing o nā hawewe pōkole ʻehā, ʻo ia ka 850 nm, 880 nm, 910 nm, a me 940 nm, i kēlā me kēia ʻano.ʻO ka SR4.2 he ʻelua-wavelong division multiplexing, hoʻohana nui ʻia no ka ʻenehana bidirectional single-fiber. Hiki ke hoʻohālikelike ʻia ka OM5 me nā lasers VCSEL me ka haʻahaʻa haʻahaʻa a me ke kumu kūʻai haʻahaʻa no ka hoʻokō maikaʻi ʻana i ka kamaʻilio pōkole e like me nā kikowaena data. ʻO ka papa 3 ma lalo nei. kahi hoʻohālikelike o nā kikoʻī bandwidth nui no nā fibers OM4 a me OM5.
I kēia manawa, ua hoʻohana ʻia ka fiber OM5 e like me ke ʻano hou o ka fiber multimode kiʻekiʻe. OM5 puluniu i loko o ka hawewe mahele pūnaewele o SR4.2.Loaʻa ia i ka hiki ke kamaʻilio ma ka haʻahaʻa haʻahaʻa, a hoʻomākaukau no ka hoʻonui hou ʻana i ka wā e hiki mai ana.E hoʻonui ʻia ka helu e hiki mai ana i 100Gb/s a i ʻole 400Gb./s, a i ʻole nā noi wideband, ʻaʻole hiki ke pani hou i ka fiber, e hōʻemi nui ana i nā kumukūʻai hoʻomaikaʻi hou aku.
Hōʻuluʻulu manaʻo: Ke hoʻomau nei ka hoʻonui ʻana o ka noi no nā noi, ke neʻe nei ka fiber multimode i ka poho haʻahaʻa haʻahaʻa, ka bandwidth kiʻekiʻe, a me ka multi-length multiplexing. Ma waena o lākou, ʻo ka mea hiki ke noi ʻia ʻo OM5 fiber, nona ka hana maikaʻi loa o ka fiber multimode o kēia manawa. a hāʻawi i kahi hopena fiber mana no nā ʻōnaehana lōʻihi o 100Gb / s a me 400Gb / s i ka wā e hiki mai ana. nā pulupulu, e like me ka multimode multi-purpose fibers, ke kūkulu ʻia nei hoʻi. I ka wā e hiki mai ana, e hoʻolauna ʻo Changfei i nā mea hou multimode fiber solutions me nā hoa ʻoihana, e lawe mai ana i nā holomua hou a me nā kumukūʻai haʻahaʻa i nā kikowaena ʻikepili a me nā pilina fiber optic.