ʻO ke kumu hana o ka module optical

Ma keʻano he mea koʻikoʻi o ke kamaʻilio fiber optical, nā modules optical nā mea optoelectronic e ʻike i nā hana o ka hoʻololi photoelectric a me ka hoʻololi electro-optical i ke kaʻina o ka hoʻouna ʻana i ka hōʻailona optical.
Ke hana nei ka module optical i ka papa kino o ke kumu hoʻohālike OSI a ʻo ia kekahi o nā mea nui i ka ʻōnaehana kamaʻilio fiber optical.Hoʻokumu ʻia ia me nā mea optoelectronic (nā transmitters optika, nā mea hoʻokipa optical), nā kaapuni hana, a me nā pilina optical.ʻO kāna hana nui ka hoʻomaopopo ʻana i ka hoʻololi photoelectric a me nā hana hoʻololi electro-optical i ke kamaʻilio fiber optical.Hōʻike ʻia ke kumu hana o ka module optical i ke kiʻi kumu hana o ka module optical.

Hoʻokomo ka interface hoʻouna i kahi hōʻailona uila me kahi helu code, a ma hope o ka hana ʻia ʻana e ka chip driver internal, ua hoʻokuʻu ʻia ka hōʻailona optical modulated o ka helu kūpono e ka laser semiconductor drive (LD) a i ʻole light-emitting diode (LED).Ma hope o ka hoʻoili ʻia ʻana ma o ka fiber optical, hoʻouna ka mea hoʻokipa i ka hōʻailona optical Ua hoʻololi ʻia i hōʻailona uila e kahi diode photodetector, a hoʻopuka ʻia kahi hōʻailona uila o ka helu helu helu pili ma hope o ka hele ʻana i kahi preamplifier.
He aha nā hōʻailona hana nui o ka module optical
Pehea e ana i ka papa kuhikuhi hana o ka module optical?Hiki iā mākou ke hoʻomaopopo i nā hōʻailona hana o nā modula optical mai nā ʻaoʻao aʻe.
Mea hoʻouna o ka module optical
Awelika hoʻouna i ka mana optical
ʻO ka awelika o ka mana optical e pili ana i ka mana optical e ke kumu kukui ma ka hopena hoʻouna o ka module optical ma lalo o nā kūlana hana maʻamau, hiki ke hoʻomaopopo ʻia e like me ka ikaika o ka mālamalama.ʻO ka mana optical i hoʻouna ʻia e pili ana i ka hapa o "1" i ka hōʻailona ʻikepili i hoʻouna ʻia.ʻOi aku ka "1", ʻoi aku ka nui o ka mana optical.Ke hoʻouna aku ka mea hoʻouna i kahi hōʻailona pseudo-random sequence, "1" a me "0" ka helu no ka hapalua o kēlā me kēia.I kēia manawa, ʻo ka mana i loaʻa ma ka hoʻāʻo ʻana ʻo ia ka awelika o ka mana optical transmitted, a ʻo ka ʻāpana he W a mW a i ʻole dBm.Ma waena o lākou, ʻo W a i ʻole mW kahi ʻāpana laina, a ʻo dBm kahi ʻāpana logarithmic.Ma ke kamaʻilio, hoʻohana pinepine mākou i ka dBm e hōʻike i ka mana optical.
Laki hoopau
ʻO ka ratio extinction e pili ana i ka waiwai liʻiliʻi o ka ratio o ka mana optical awelika o ka laser i ka wā e hoʻokuʻu ana i nā code "1" āpau i ka mana optical awelika i hoʻokuʻu ʻia ke hoʻokuʻu ʻia nā code "0" āpau ma lalo o nā kūlana modulation piha, a ʻo ka ʻāpana he dB .E like me ka mea i hōʻike ʻia ma ka Figure 1-3, i ka wā e hoʻohuli ai mākou i kahi hōʻailona uila i kahi hōʻailona optical, ʻo ka laser ma ka ʻāpana hoʻouna o ka module optical e hoʻohuli iā ia i hōʻailona optical e like me ka helu code o ka hōʻailona uila hoʻokomo.ʻO ka mana optical maʻamau ke hōʻike nā code "1" a pau i ka mana awelika o ka kukui e hoʻokuʻu ana i ka laser, ka mana optical awelika ke hōʻike nā code "0" āpau i ka mana awelika o ka laser i hoʻokuʻu ʻole i ka mālamalama, a ʻo ka ratio extinction e hōʻike ana i ka hiki. e hoʻokaʻawale i waena o nā hōʻailona 0 a me 1, no laila hiki ke manaʻo ʻia ʻo Extinction ratio e like me ke ana o ka pono hana laser.ʻO nā waiwai liʻiliʻi maʻamau no ka lākiō pio mai ka 8.2dB a i ka 10dB.
ʻO ka lōʻihi hawewe waena o ka hōʻailona optical
Ma ke kiko o ka hoʻokuʻu ʻana, ʻo ka lōʻihi nalu e pili ana i ka waena waena o ka māhele laina e hoʻopili ana i nā koina amplitude kiʻekiʻe 50℅.ʻO nā ʻano laser ʻelua a i ʻole nā ​​laser ʻelua o ka ʻano like e loaʻa i nā nalu waena ma muli o ke kaʻina hana, hana a me nā kumu ʻē aʻe.Hiki i ka laser like ke loaʻa nā nalu waena ma lalo o nā kūlana like ʻole.ʻO ka mea maʻamau, hāʻawi nā mea hana o nā mea optical a me nā modula optical i nā mea hoʻohana me kahi ʻāpana, ʻo ia hoʻi, ka lōʻihi o ka nalu waena (e like me 850nm), a ʻo kēia ʻāpana he laulā.I kēia manawa, ʻekolu mau nalu waena o nā modula optical maʻamau: 850nm band, 1310nm band a me 1550nm band.
No ke aha i wehewehe ʻia ai ma kēia mau pūʻulu ʻekolu?Pili kēia i ka nalo ʻana o ka mea hoʻouna fiber optical o ka hōʻailona optical.Ma o ka noiʻi ʻana a me nā hoʻokolohua hoʻomau, ʻike ʻia ka emi maʻamau o ka nalowale o ka fiber me ka lōʻihi o ka nalu.He emi ka poho ma 850nm, a lilo ka poho ma 900 ~ 1300nm kiʻekiʻe;ʻoiai ma 1310nm, lilo ia i haʻahaʻa, a ʻo ka nalowale ma 1550nm ka haʻahaʻa loa, a ʻo ka nalowale ma luna o 1650nm e hoʻonui.No laila, ʻo 850nm ka puka makani hawewe pōkole i kapa ʻia, a ʻo 1310nm a me 1550nm nā puka makani lōʻihi.
Loaʻa i ka module optical
Hoʻonui i ka mana optical
ʻIke ʻia hoʻi ʻo ka mana optical saturated, e pili ana i ka mana optical awelika kiʻekiʻe loa e hiki ke loaʻa i nā ʻāpana hopena e loaʻa ma lalo o kahi helu hapa bit (BER=10-12) o ka module optical.ʻO ka ʻāpana he dBm.
Pono e hoʻomaopopo ʻia e ʻike ʻia ka mea nānā kiʻi kiʻi kiʻi kiʻi kiʻi saturation ma lalo o ka hoʻomālamalama kukui ikaika.Ke hiki mai kēia ʻano, pono ka mea ʻike i kekahi manawa e hoʻōla.I kēia manawa, emi ka naʻau o ka loaʻa ʻana, a hiki ke kuhi hewa ʻia ka hōʻailona i loaʻa.kumu hewa code.No ka maʻalahi, inā ʻoi aku ka mana o ka optical input ma mua o kēia mana optical overload, hiki ke hōʻino i nā mea hana.I ka wā o ka hoʻohana ʻana a me ka hana ʻana, e hoʻāʻo e pale i ka ʻike ʻana i ka mālamalama ikaika e pale aku i ka nui o ka mana optical overload.
ʻO ka naʻau o ka mea hoʻokipa
ʻO ka loaʻa ʻana o ka sensitivity e pili ana i ka palena haʻahaʻa haʻahaʻa haʻahaʻa i hiki ke loaʻa i nā ʻāpana hopena ma lalo o ke ʻano o kekahi hapa hapa hapa (BER=10-12) o ka module optical.Inā pili ka mana optical transmit i ka ikaika māmā ma ka hopena o ka hoʻouna ʻana, a laila pili ka naʻau o ka loaʻa i ka ikaika māmā e ʻike ʻia e ka module optical.ʻO ka ʻāpana he dBm.
Ma keʻano laulā, ʻoi aku ka kiʻekiʻe o ka helu, ʻoi aku ka maikaʻi o ka naʻau o ka loaʻa ʻana, ʻo ia hoʻi, ʻoi aku ka liʻiliʻi o ka mana optical i loaʻa, ʻoi aku ka kiʻekiʻe o nā koi no nā ʻāpana hopena o ka module optical.
Loaʻa ka mana optical
ʻO ka mana optical i loaʻa e pili ana i ka awelika o ka mana optical e hiki ke loaʻa i nā ʻāpana hopena e loaʻa ana ma lalo o ke ʻano o kekahi hapa hapa hapa (BER=10-12) o ka module optical.ʻO ka ʻāpana he dBm.ʻO ka palena kiʻekiʻe o ka mana optical i loaʻa ʻo ia ka overload optical power, a ʻo ka palena haʻahaʻa ʻo ia ka waiwai kiʻekiʻe o ka ʻike ʻike.
ʻO ka ʻōlelo maʻamau, inā ʻoi aku ka haʻahaʻa o ka mana optical i loaʻa ma mua o ka sensitivity loaʻa, ʻaʻole hiki ke loaʻa ka hōʻailona maʻamau no ka nāwaliwali loa o ka mana optical.Ke ʻoi aku ka nui o ka mana optical i loaʻa ma mua o ka mana optical overload, ʻaʻole hiki ke loaʻa nā hōʻailona maʻamau ma muli o nā hewa bit.
Papa kuhikuhi hana piha
māmā māmā
ʻO ka nui o ka nui o ka hōʻailona uila o ka hoʻouna hewa ʻole i hiki i nā mea optical ke lawe, ʻo ka Ethernet standard stipulates: 125Mbit/s, 1.25Gbit/s, 10.3125Gbit/s, 41.25Gbit/s.
Ka mamao hoʻouna
ʻO ka mamao o ka hoʻouna ʻana o nā modules optical i kaupalena ʻia e ka nalowale a me ka hoʻopuehu.ʻO ka poho ka nalowale o ka ikehu māmā ma muli o ka absorption, ka hoʻopuehu ʻana a me ka leakage o ke kikowaena i ka wā e hoʻouna ʻia ai ka mālamalama i ka fiber optical.Hoʻopau ʻia kēia ʻāpana o ka ikehu ma kekahi ʻano i ka piʻi ʻana o ka mamao hoʻouna.ʻO ka hoʻopuehu ʻana ma muli o ka hoʻolaha ʻana o nā hawewe electromagnetic o nā hawewe like ʻole i nā wikiwiki like ʻole i ke ʻano like ʻole, ka hopena i nā ʻāpana hawewe like ʻole o ka hōʻailona optical e hōʻea ana i ka hopena e loaʻa i nā manawa like ʻole ma muli o ka hōʻiliʻili ʻana o nā mamao o ka lawe ʻana, ka hopena i ka pulse. ka hoʻonui ʻana, ʻaʻole hiki ke ʻike i ka waiwai o nā hōʻailona.
Ma ke ʻano o ka hoʻopuehu ʻana o ka module optical, ʻoi aku ka mamao o ka palena palena ma mua o ka palena palena o ka nalowale, no laila hiki ke nānā ʻole ʻia.Hiki ke helu ʻia ka palena pohō e like me ke ʻano: ka mamao palena palena = (ka mana optical i hoʻouna ʻia - ka loaʻa ʻana o ka ʻike) / attenuation fiber.ʻO ka attenuation o ka fiber optical pili ikaika i ka fiber optical i koho ʻia.