Wahi a nā kūlana ITU-T, ua māhele ʻia nā fiber optical kamaʻilio i 7 mau ʻāpana: G.651 a i G.657. He aha ka ʻokoʻa ma waena o lākou?
1、G.651 puluniu
G.651 he Multi-mode puluniu, a me G.652 i G.657 nā mea a pau he hookahi-mode fibers.
Hoʻokumu ʻia ka fiber optical me ka core, cladding and coating, e like me ka hōʻike ʻana ma ka Figure 1.
ʻO ka maʻamau ka 125um ka anawaena o ka pale, ka uhi ʻana (ma hope o ke kala ʻana) he 250um; a ʻaʻohe waiwai paʻa ke anawaena kumu, no ka mea, ʻo ka ʻokoʻa o ke anawaena koʻikoʻi e hoʻololi i ka hana hoʻoili fiber optical i ka nui.
Kiʻi 1. Hoʻolālā fiber
ʻO ka maʻamau ke anawaena kumu o ka fiber multimode mai 50um a 100um. Hoʻomaikaʻi maikaʻi ʻia ka hana hoʻoili ʻana o ka fiber ke liʻiliʻi ke anawaena kumu. E like me ka mea i hōʻike ʻia ma ke Kiʻi 2.
Kiʻi 2. Ka hoʻouna ʻana i ke ʻano he nui
Hoʻokahi wale nō ʻano hoʻoili i ka wā ʻoi aku ka liʻiliʻi o ke anawaena kumu o ka fiber ma mua o kekahi waiwai, e like me ka hōʻike ʻana ma ke Kiʻi 3, a lilo ia i fiber mode hoʻokahi.
Kiʻi 3. Ka hoʻouna ʻana i ke ʻano hoʻokahi
2、G.652 Fiber
ʻO ka fiber optical G.652 ka fiber optical i hoʻohana nuiʻia. I kēia manawa, ma waho aʻe o ka fiber i ka home (FTTH) home optical cable,ʻo ka fiber optical i hoʻohanaʻia ma ka lōʻihi lōʻihi a me ka metropolitan kahi kokoke i ka G.652 optical fiber.Also kauoha nui nā mea kūʻai i kēia ʻano mai Honww.
ʻO ka attenuation kekahi o nā mea koʻikoʻi e pili ana i ka mamao o ka lawe ʻana o ka fiber optical. Hoʻopili ʻia ka coefficient attenuation o kahi fiber optical me ka lōʻihi hawewe. E like me ka mea i hōʻike ʻia ma ka Figure 4. Hiki ke ʻike ʻia mai ke kiʻi ʻana o ka attenuation o ka fiber ma 1310nm a me 1550nm he mea liʻiliʻi, no laila ua lilo ʻo 1310nm a me 1550nm i nā puka makani lōʻihi loa i hoʻohana ʻia no nā fibers mode hoʻokahi.
Kiʻi 4. Ka helu hoʻemi o ka fiber mode hoʻokahi
3、G.653 Fiber
Ma hope o ka hoʻonui ʻia ʻana o ka wikiwiki o nā ʻōnaehana kamaʻilio optical, hoʻomaka ka hoʻoili ʻana i ka hōʻailona e pili i ka hoʻopuehu fiber. ʻO ka dispersion e pili ana i ka hōʻailona distortion (pulse broadening) i hoʻokumu ʻia e nā ʻāpana alapine like ʻole a i ʻole nā ʻano ʻano ʻano like ʻole o kahi hōʻailona (pulse) e hoʻolaha ana ma nā wikiwiki like ʻole a hiki i kahi mamao, e like me ka hōʻike ʻana ma ke Kiʻi 5.
Kiʻi 5. Hoʻopuehu fiber
ʻO ka dispersion coefficient o ka fiber optical e pili pū ana me ka nalu nalu, e like me ka mea i hōʻike ʻia ma ka Figure 6. ʻO ka fiber mode-hoʻokahi ka liʻiliʻi o ka attenuation coefficient ma 1550 nm, akā ʻoi aku ka nui o ka dispersion coefficient i kēia nalu. No laila ua hoʻomohala nā kānaka i kahi fiber mode hoʻokahi me ka dispersion coefficient o 0 ma 1550nm. ʻO G.653 kēia fiber me he mea lā.
Kiʻi 6. ʻO ka helu hoʻopuehu o G.652 a me G.653
Eia naʻe, ʻo ka hoʻopuehu ʻana o ka fiber optical he 0 akā ʻaʻole kūpono ia no ka hoʻohana ʻana i nā ʻōnaehana hawewe lōʻihi (WDM), no laila ua hoʻopau koke ʻia ka fiber optical G.653.
4、G.654 Fiber
Hoʻohana nui ʻia ʻo G.654 fiber optical i nā ʻōnaehana kamaʻilio submarine cable. I mea e hoʻokō ai i nā koi lōʻihi a me nā mana nui o ke kamaʻilio kelepona submarine.
5、G.655 Fiber
ʻAʻole hoʻopuehu ʻia ka fiber G.653 ma 1550nm ka lōʻihi o ka nalu a ʻaʻole hoʻohana i ka ʻōnaehana WDM, no laila ua hoʻomohala ʻia kahi fiber me ka liʻiliʻi akā ʻaʻole ka hoʻopuehu ʻana ma 1550nm. ʻO kēia ka fiber G.655. ʻO G.655 fiber me ka liʻiliʻi liʻiliʻi ma kahi kokoke i ka nalu nalu 1550nm, ka liʻiliʻi liʻiliʻi a ʻaʻole ʻole, a hiki ke hoʻohana ʻia i nā ʻōnaehana WDM; No laila, ʻo G.655 fiber ka mea koho mua loa no nā laina kumu lāʻau lōʻihi ma mua o 20 mau makahiki ma kahi o 2000. Hōʻike ʻia ka coefficient attenuation a me ka dispersion coefficient o G.655 fiber ma ke Kiʻi 7.
Kiʻi 7. ʻO ka helu hoʻopuehu o G.652/G.653/G.655
Eia nō naʻe, ke kū nei kēlā fiber optical maikaʻi i kahi lā o ka hoʻopau ʻana. Me ka oʻo o ka ʻenehana uku hoʻopuehu, ua hoʻololi ʻia ka pulu G.655 e ka fiber G.652. E hoʻomaka ana mai ka makahiki 2005, ua hoʻomaka ka hoʻohana ʻana o nā laina kumu lōʻihi i ka fiber optical G.652 ma kahi ʻano nui. I kēia manawa, ʻaneʻane hoʻohana ʻia ka fiber optical G.655 no ka mālama ʻana i ka laina lōʻihi mua.
Aia kekahi kumu nui e hoʻopau ʻia ai ka fiber G.655:
ʻO ka maʻamau maʻamau kahua kahua o G.655 fiber he 8 ~ 11μm (1550nm). ʻO ke anawaena kahua mode o nā fiber i hana ʻia e nā mea hana fiber ʻokoʻa paha he ʻokoʻa nui, akā ʻaʻohe ʻokoʻa i ke ʻano o ka fiber, a pili ka fiber me ka ʻokoʻa nui i ke anawaena o ke kahua ʻano i kekahi manawa aia kahi attenuation nui, e lawe mai ana i ka nui. pilikia i ka mālama; No laila, ma ka ʻōnaehana kumu, e koho nā mea hoʻohana i ka fiber G.652 ma mua o G.655, ʻoiai inā makemake ʻia nā kumukūʻai uku hoʻopuehu.
6、G.656 Fiber
Ma mua o ka hoʻokomo ʻana i ka fiber optical G.656, e hoʻi kākou i ka wā i noho aliʻi ai ʻo G.655 i nā laina kumu lōʻihi.
Mai ka hiʻohiʻona o nā hiʻohiʻona attenuation, hiki ke hoʻohana ʻia ka fiber G.655 no ke kamaʻilio ʻana i ka lōʻihi hawewe mai 1460nm a 1625nm (S + C + L band), akā no ka liʻiliʻi o ka dispersion coefficient o ka fiber ma lalo o 1530nm, ʻaʻole ia. kūpono no ka mahele hawewe (WDM). ) ʻōnaehana i hoʻohana ʻia, no laila, ʻo 1530nm～1525nm (C+L band).
I mea e hiki ai ke hoʻohana i ka 1460nm-1530nm wavelength range (S-band) o ka fiber optical no ke kamaʻilio ʻana, e hoʻāʻo e hōʻemi i ka dispersion slope o ka G.655 optical fiber, i lilo i G.656 optical fiber. Hōʻike ʻia ka coefficient attenuation a me ka dispersion coefficient o G.656 fiber ma ke Kiʻi 8.
Helu 8
Ma muli o nā hopena laina ʻole o ka fiber optical, ʻaʻole e hoʻonui nui ʻia ka helu o nā kahawai i nā ʻōnaehana WDM lōʻihi, ʻoiai ke kumukūʻai o ke kūkulu ʻana i nā fiber optical metropolitan area. ʻAʻole kūpono ka hoʻonui ʻana i ka nui o nā kahawai ma nā ʻōnaehana WDM. No laila, ʻo ka ʻāpana hawewe lōʻihi o kēia manawa (DWDM) ) ʻO ka nalu 80/160 ka nui, ua lawa ka C + L o ka nalu o ka fiber optical e hoʻokō i ka koi. Inā ʻaʻole ʻoi aku ka nui o nā koi o nā ʻōnaehana kiʻekiʻe no ka spacing channel, ʻaʻole loaʻa ka fiber G.656 i kahi hoʻohana nui.
6、G.657 Fiber
ʻO G.657 ka fiber optical ka mea i hoʻohana nui ʻia koe G.652. ʻO ke kaula optical i hoʻohana ʻia no ka home FTTH i ʻoi aku ka lahilahi ma mua o ka laina kelepona, aia me ka fiber G.657 i loko. / aiʻole leka uila iā [palapala leka uila], Mahalo!