Nkhani - Waveband ya fiber optical

Kulankhulana kwa fiber kumatenga kuwala ngati chonyamulira zidziwitso polumikizana.Ikhoza kufalitsidwa kudzera mu fiber core.Komabe, si kuwala kulikonse komwe kuli koyenera kulumikizana.Kutayika kwa kufalikira kumasiyanasiyana ndi ma waveband osiyanasiyana a kuwala.Kuti akwaniritse kutaya pang'ono komanso kukhala bwino, asayansi nthawi zonse amafunafuna kuwala koyenera kwambiri.

850nm Waveband

Kumayambiriro kwa zaka za m’ma 1980, asayansi anayamba kufufuza ukadaulo wa optical fiber communication m’njira yothandiza.Multi-mode fiber ndi zomwe amaphunzira kwambiri.Ndi ma fiber cores okulirapo, ulusi wamuti-mode umatha kuzindikira kufalikira kumodzi kwa nyali zamtundu wamuti.850nm wavelength kuwala ndi komwe kunkagwiritsidwa ntchito poyamba.

O Waveband

Kumayambiriro kwa zaka za m'ma 1990, fiber ya single-mode inayamba kugwiritsidwa ntchito kwambiri.

Chithunzi 1

Asayansi adapeza kuti kuwala kwa 1260nm ~ 1360nm waveband kungathe kukwaniritsa kupotoza kochepa kwambiri kwa chizindikiro ndi kutaya kwa kachilombo komwe kunayambika chifukwa cha kubalalitsidwa kudzera mu mayesero.Ndi mayesero ndi zolakwika, asayansi adapeza kuti kuwala kokhala ndi 1260nm ~ 1625nm kulinso m'malo otayika kwambiri ndipo ndiko kuwala koyenera kwambiri kufalitsa fiber.

Kuwala kwa 1260nm ~ 1625nm waveband kumagawidwa kukhala ma waveband asanu-O, E waveband, S waveband, C waveband ndi L waveband.

Chithunzi 2

Asayansi adapezanso ubale pakati pa kutayika kwa kachilomboka ndi kutalika kwa mafunde.Zikuwonekera motere.

Chithunzi 3

Gulu lodziwika kwambiri ndi C waveband ((1530nm~1565nm), lomwe limayimira "zachizolowezi".Gulu la C limatha kukwaniritsa kutayika kocheperako komwe kumagwiritsidwa ntchito kwambiri kwa MAN, mtunda wautali, mtunda wautali kwambiri, machitidwe a chingwe chapansi pamadzi ndi dongosolo la WDM.

L Waveband (1565nm ~ 1625nm)

L amaimira "utali wavelength".L waveband ikhoza kukwaniritsa kutayika kwachiwiri kochepa komanso ndi chimodzi mwazosankha zazikulu zamafakitale.Ngati C waveband ikulephera kukwaniritsa zosowa za bandwidth, Anthu nthawi zambiri amatenga L waveband ngati chothandizira.

S Waveband (1460nm ~ 1530nm)

S imayimira "short-wavelength".Zikafika pakutayika kwa fiber, ndizokwera kuposa O waveband.Nthawi zambiri amagwiritsidwa ntchito kumunsi kwa wavelength wa PON.

E Waveband

Ndilo gulu locheperako kwambiri pakati pa mitundu isanu ya ma waveband.E imayimira "kuwonjezera".Monga momwe zasonyezedwera pa chithunzi 3, chotupa chikhoza kuwoneka pa E waveband.Ndi chifukwa chakuti idatengedwa ndi OH- zomwe zimatsogolera ku kutaya kwakukulu, komwe kumatchedwanso nsonga yamadzi.

M'masiku akale, chifukwa chaukadaulo wocheperako, madzi adasakanizidwa mugalasi la fiber optical zomwe zidapangitsa kutayika kwakukulu kwa ma E waveband ndipo zimalephera kugwira ntchito bwino.Pambuyo pake, anthu adapanga ukadaulo wotsitsa madzi m'thupi popanga magalasi, kuyambira pamenepo, kutayika kwapang'onopang'ono mu E waveband kunali kotsika kuposa O waveband.Komabe, kutayika kwapatsirana kudachitika pa E waveband pa chingwe cha fiber optical chomwe chidakhazikitsidwa kale chomwe chidafotokoza kuti pali malire a E waveband omwe amagwiritsidwa ntchito polumikizana ndi fiber optical.