Monga gawo lofunikira la optical fiber communication, ma modules optical ndi zipangizo za optoelectronic zomwe zimazindikira ntchito za photoelectric conversion ndi electro-optical conversion poyendetsa chizindikiro cha kuwala.
Optical module imagwira ntchito pagawo lakuthupi lachitsanzo cha OSI ndipo ndi chimodzi mwazinthu zazikuluzikulu mu optical fiber communication system.Amapangidwa makamaka ndi zida za optoelectronic (ma transmitter optical, optical receiver), mabwalo ogwira ntchito, ndi mawonekedwe owonekera.Ntchito yake yayikulu ndikuzindikira kutembenuka kwa photoelectric ndi kutembenuka kwa electro-optical mu optical fiber communication.Mfundo yogwirira ntchito ya module ya optical ikuwonetsedwa mu chithunzithunzi cha ntchito ya optical module.
Mawonekedwe otumizira amalowetsa chizindikiro chamagetsi ndi mlingo wina wa code, ndipo pambuyo pokonzedwa ndi chipangizo choyendetsa mkati, chizindikiro cha kuwala kofanana ndi chiwongoladzanja chofananacho chimatulutsidwa ndi galimoto yoyendetsa semiconductor laser (LD) kapena kuwala-emitting diode (LED).Pambuyo pa kufalikira kudzera mu fiber optical, mawonekedwe olandila amatumiza chizindikiro cha kuwala Amasinthidwa kukhala chizindikiro cha magetsi ndi photodetector diode, ndipo chizindikiro chamagetsi cha chiwerengero chofanana cha code chimatuluka pambuyo podutsa preamplifier.
Kodi zizindikiro zazikulu za mawonekedwe a Optical module ndi ziti
Kodi mungayese bwanji index ya magwiridwe antchito a Optical module?Titha kumvetsetsa zizindikiro za machitidwe a optical modules kuchokera kuzinthu zotsatirazi.
Kutumiza kwa Optical module
Avereji yotumiza mphamvu ya kuwala
Mphamvu yamagetsi yopatsirana imatanthawuza kutulutsa kwa mphamvu ya kuwala ndi gwero la kuwala pamapeto otumizira ma module optical pansi pazikhalidwe zogwirira ntchito, zomwe zingamveke ngati mphamvu ya kuwala.Mphamvu yamagetsi yopatsirana imakhudzana ndi gawo la "1" mu siginecha yotumizidwa.Kuchuluka kwa "1", kumapangitsanso mphamvu ya kuwala.Wotumiza akatumiza chizindikiro chotsatira, "1" ndi "0" pafupifupi theka lililonse.Panthawiyi, mphamvu yopezedwa ndi mayeso ndi mphamvu yamagetsi yopatsirana, ndipo unit ndi W kapena mW kapena dBm.Pakati pawo, W kapena mW ndi gawo la mzere, ndipo dBm ndi gawo la logarithmic.Polankhulana, nthawi zambiri timagwiritsa ntchito dBm kuyimira mphamvu ya kuwala.
Mlingo wa Extinction
Chiŵerengero cha kuzimiririka chimatanthawuza kumtengo wochepera wa chiŵerengero cha mphamvu ya kuwala ya laser pamene imatulutsa "1" zizindikiro zonse ku mphamvu yapakati ya kuwala yomwe imatulutsidwa pamene "0" zizindikiro zonse zimatulutsidwa pansi pa kusinthika kwathunthu, ndipo unit ndi dB. .Monga momwe tawonetsera pa Chithunzi 1-3, pamene titembenuza chizindikiro cha magetsi kukhala chizindikiro cha kuwala, laser mu gawo lopatsirana la optical module imatembenuza kukhala chizindikiro cha kuwala molingana ndi chiwerengero cha chizindikiro cha magetsi olowera.Avereji ya mphamvu ya kuwala pamene "1" zizindikiro zonse zimayimira mphamvu yapakati ya kuwala kotulutsa laser, mphamvu yapakati ya kuwala pamene "0" zizindikiro zonse zimayimira mphamvu yapakati ya laser yomwe simatulutsa kuwala, ndipo chiŵerengero cha kuzimiririka chikuyimira luso. kusiyanitsa pakati pa 0 ndi 1 chizindikiro, kotero kuti chiŵerengero cha Extinction chikhoza kuonedwa ngati muyeso wa kuyendetsa bwino kwa laser.Miyezo yocheperako ya chiyerekezo cha kutha kumayambira 8.2dB mpaka 10dB.
Kutalika kwapakati kwa chizindikiro cha kuwala
Mu emission sipekitiramu, wavelength lolingana ndi midpoint ya mzere gawo kulumikiza 50℅ pazipita matalikidwe mfundo.Mitundu yosiyanasiyana ya ma lasers kapena ma laser awiri amtundu womwewo adzakhala ndi mafunde osiyanasiyana apakati chifukwa cha ndondomeko, kupanga ndi zifukwa zina.Ngakhale laser yemweyo akhoza kukhala ndi mafunde osiyanasiyana apakati pazikhalidwe zosiyanasiyana.Nthawi zambiri, opanga zida zowoneka bwino ndi ma module owoneka amapatsa ogwiritsa ntchito chizindikiro, ndiye kuti, kutalika kwapakati (monga 850nm), ndipo chizindikirochi nthawi zambiri chimakhala chosiyanasiyana.Pakalipano, pali makamaka mafunde atatu apakati omwe amagwiritsidwa ntchito kwambiri: 850nm band, 1310nm band ndi 1550nm band.
N’chifukwa chiyani zikufotokozedwa m’magulu atatuwa?Izi zikugwirizana ndi kutayika kwa sing'anga yotumizira ma fiber optical.Kupyolera mu kufufuza kosalekeza ndi kuyesa, zimapezeka kuti kutayika kwa fiber nthawi zambiri kumachepa ndi kutalika kwa kutalika kwa mawonekedwe.Kutayika kwa 850nm kumakhala kochepa, ndipo kutayika kwa 900 ~ 1300nm kumakhala kwakukulu;pomwe pa 1310nm, imakhala yotsika, ndipo kutayika kwa 1550nm ndikotsika kwambiri, ndipo kutayika pamwamba pa 1650nm kumawonjezeka.Chifukwa chake 850nm ndiye zenera lotchedwa lalifupi lalitali, ndipo 1310nm ndi 1550nm ndi mazenera autali atalitali.
Wolandila wa module ya Optical
Kuchulukira kwa kuwala kwamphamvu
Zomwe zimadziwikanso kuti saturated Optical power, zimatanthawuza mphamvu yowonjezereka ya kuwala komwe zigawo zolandirira zimatha kulandira pamlingo wina wolakwika (BER=10-12) wa module ya Optical.Chigawochi ndi dBm.
Tikumbukenso kuti photodetector adzaoneka photocurrent machulukitsidwe chodabwitsa pansi amphamvu kuwala walitsa.Izi zikachitika, chojambuliracho chimafunika nthawi kuti chibwezeretse.Panthawi imeneyi, kukhudzidwa kwa kulandira kumachepa, ndipo chizindikiro cholandira chikhoza kuganiziridwa molakwika.yambitsa zolakwika za code.Kunena mophweka, ngati mphamvu ya kuwala yolowetsayo iposa mphamvu ya kuwalayi, ikhoza kuwononga zida.Mukamagwiritsa ntchito ndikugwiritsa ntchito, yesetsani kupewa kuyatsa kwamphamvu kuti mupewe kuchulukira kwamphamvu yamagetsi.
Receiver tilinazo
Kulandila kukhudzika kumatanthauza mphamvu yochepera yapakati yolowera yomwe zida zolandirira zimatha kulandira pansi pamlingo wina wolakwika (BER=10-12) wa module ya Optical.Ngati mphamvu yopatsirana imatanthawuza kuwala kwa kuwala pamapeto otumiza, ndiye kuti kulandira mphamvu kumatanthawuza mphamvu ya kuwala yomwe imatha kuzindikiridwa ndi module ya optical.Chigawochi ndi dBm.
Kawirikawiri, kuchuluka kwa mlingowo, kuwonjezereka kwa mphamvu zolandirira, ndiko kuti, mphamvu yocheperapo yolandirira kuwala, ndipamwamba kwambiri zofunikira zopezera zigawo zomaliza za module ya optical.
Analandira mphamvu ya kuwala
Mphamvu ya kuwala yomwe idalandira imatanthawuza kuchuluka kwa mphamvu yamagetsi yomwe zigawo zomaliza zolandirira zimatha kulandira pansi pamlingo wina wolakwika (BER=10-12) wa module ya optical.Chigawochi ndi dBm.Malire apamwamba a mphamvu ya kuwala yomwe analandira ndi mphamvu yowonjezereka ya kuwala, ndipo malire apansi ndi ofunika kwambiri pakumva kutengeka.
Nthawi zambiri, mphamvu ya kuwala ikakhala yocheperako kuposa yomwe imalandira, chizindikirocho sichingalandiridwe bwino chifukwa mphamvu ya kuwala ndi yofooka kwambiri.Mphamvu yowala ikakhala yayikulu kuposa mphamvu yamagetsi yodzaza, ma siginecha sangalandiridwe bwino chifukwa cha zolakwika pang'ono.
Comprehensive performance index
liwiro la mawonekedwe
Pazipita magetsi chizindikiro mlingo wa kufala opanda cholakwika kuti zipangizo kuwala angathe kunyamula, Efaneti muyezo limati: 125Mbit/s, 1.25Gbit/s, 10.3125Gbit/s, 41.25Gbit/s.
Mtunda wotumizira
Mtunda wotumizira ma modules optical makamaka umakhala wochepa chifukwa cha kutaya ndi kubalalitsidwa.Kutayika ndiko kutayika kwa mphamvu ya kuwala chifukwa cha kuyamwa, kumwazikana ndi kutuluka kwa sing'anga pamene kuwala kumafalikira mu fiber optical.Mbali iyi ya mphamvu imatayidwa pamlingo wina pamene mtunda wotumizira ukuwonjezeka.Kubalalika kumachitika makamaka chifukwa chakuti mafunde a elekitiromagineti a mafunde osiyanasiyana amafalikira pa liwiro losiyana mu sing'anga yomweyo, zomwe zimapangitsa kuti zigawo zosiyanasiyana za mawonekedwe a kuwala zimafika pamapeto olandila nthawi zosiyanasiyana chifukwa cha kuchuluka kwa mtunda wotumizira, zomwe zimapangitsa kugunda kwa mtima. kukulitsa, zomwe zimapangitsa kuti zikhale zosatheka kusiyanitsa mtengo wazizindikiro.
Pankhani ya kuchepa kwapang'onopang'ono kwa module ya optical, mtunda wocheperako ndi waukulu kwambiri kuposa mtunda wochepa wa kutayika, kotero ukhoza kunyalanyazidwa.Malire otayika amatha kuyerekezedwa molingana ndi chilinganizo: kutaya mtunda wochepera = (mphamvu yopatsirana - kulandira kukhudzika) / kuchepetsedwa kwa fiber.Kutsika kwa kuwala kwa fiber kumagwirizana kwambiri ndi mawonekedwe enieni osankhidwa.
Nthawi yotumiza: Apr-27-2023