Emva kokuba imodyuli ye-optical ifakwe, ukuvavanya ukusebenza kwayo kuyinyathelo elibalulekileyo.Xa amacandelo optical kwinkqubo yonke yenethiwekhi ebonelelwa ngumthengisi ofanayo, ukuba inkqubo yenethiwekhi ingasebenza ngokuqhelekileyo, akukho mfuneko yokuvavanya ngokwahlukileyo i-sub-components. yenkqubo.Nangona kunjalo, uninzi lwamacandelo angaphantsi kuninzi lweenkqubo zothungelwano luvela kubathengisi abahlukeneyo. Ke ngoko, ukuvavanya amacandelo e-optical, ngakumbi ukusebenza kunye nokusebenzisana kwemodyuli nganye ye-optical kubalulekile. Ke uvavanya njani ukusebenza kwemodyuli ye-optical?
Imodyuli ye-optical iqulunqwe ngumthumeli kunye nommkeli.Xa umthumeli exhunywe kummkeli ngefiber optical, ukuba isantya sephutha lenkqubo yonke ayiphumeleli umphumo olindelekileyo, ngaba yingxaki yokuhambisa okanye ingxaki yokufumana? Imodyuli yovavanyo yovavanyo ngokubanzi yahlulahlulwe yangamanyathelo amane, ahlulahlulwe kakhulu abe ziimvavanyo zothumelo kunye nomamkeli.
Uvavanyo lokuhambisa
Xa uvavanya, kufuneka ubeke ingqalelo kwi-wavelength kunye nokumila kwe-waveform ye-transmitter output wave, kunye nokunyamezela i-jitter kunye ne-bandwidth yomamkeli. Xa uvavanya i-transmitter, kufuneka ubeke ingqalelo kula manqaku mabini alandelayo: Okokuqala: Umgangatho wesiginali yegalelo esetyenziselwa ukuvavanya umthumeli kufuneka ube ulungile ngokwaneleyo. Ukongeza, umgangatho wemilinganiselo yombane kufuneka uqinisekiswe ngemilinganiselo yejitter kwaye imilinganiselo yedayagramu yamehlo.Imilinganiselo yedayagram yamehlo yindlela eqhelekileyo yokujonga i-wave waveform ye-transmitter ngenxa yokuba umzobo wamehlo uqulethe ubutyebi bolwazi olubonisa ukusebenza ngokubanzi kwe-transmitter.
Okwesibini: Umqondiso ophumayo we-optical optical we-transmitter kufuneka ulinganiswe ngezibonakaliso zomgangatho we-optical ezifana novavanyo lwe-eye diagram, i-optical modulation amplitude kunye ne-extinction ratio.
Uvavanyo lomamkeli
Xa uvavanya umamkeli, kufuneka kwakhona unikele ingqalelo kula manqaku mabini alandelayo:
Okokuqala:Ngokungafaniyo nesithumeli sovavanyo, umgangatho wesiginali ye-optical kufuneka uhlwempuzeke ngokwaneleyo xa uvavanya umamkeli. Ke ngoko, umzobo woxinzelelo olukhanyayo omele olona phawu lubi kufuneka lwenziwe. Olu phawu lubi kakhulu kufuneka lugqithise ijita. Umlinganiselo kunye novavanyo lwamandla okukhanya lusetyenziselwa ukulinganisa.
Okwesibini:Okokugqibela, kufuneka uvavanye isiginali yemveliso ye-elektroniki yomamkeli. Kukho iintlobo ezintathu eziphambili zovavanyo:
Uvavanyo lwedayagram yamehlo: Oku kuqinisekisa ukuba “amehlo” omzobo wamehlo avulekile. Uvavanyo lwedayagram yamehlo ludla ngokufezekiswa ngobunzulu besantya sempazamo encinci
Uvavanyo lweJitter: vavanya iintlobo ezahlukeneyo zejitha
Ukulandelela iJitter kunye nokunyamezelana: Vavanya ukulandelwa kwejitter ngesekethe yangaphakathi yokubuyisela iwotshi
Imodyuli yovavanyo olukhanyayo ngumsebenzi onzima, kodwa kwakhona linyathelo eliyimfuneko ukuqinisekisa ukusebenza kwayo. Njengendlela yokulinganisa esetyenziswa ngokubanzi, ukulinganisa umzobo wamehlo kunokuvavanya ngokufanelekileyo i-emitter yemodyuli ye-optical. Uvavanyo lomamkeli wemodyuli ye-optical lunzima ngakumbi kwaye lufuna iindlela zokuvavanya ngakumbi.