Imiyalelo ekhethekileyo ye-erbium-doped fiber amplifier (Isandisi-lizwi se-EDFA Optical)
Uthenge ii-amplifier yefayibha efakwe i-erbium(Isandisi-lizwi se-EDFA Optical) esineenkcukacha ze-30dB gain kunye namandla okukhupha ugcwaliso lwe-+20dBm.
Qhagamshela isibane sokufaka se-0dBm uze ufunde isiphumo se-+27dBm. Ungabala ukuba yi-30-3=27, kwaye i-gain ayiyongxaki.
Kodwa kuthekani ukuba ufaka i--20dBm? I-nominal gain ye-30dB ithetha ukuba isiphumo kufuneka sibe+10dBm, kodwa umlinganiselo wokwenyani yi+7dBm kuphela – i-full 3dB ingaphantsi. Oku akuyongxaki yomgangatho. I-30dB yi-small signal gain, ngelixa i-ASE ingxolo kunye ne-noise figure zitya i-gain yakho. Enyanisweni, i-measured gain idla ngokuwela ngaphantsi kwe-nominal gain, nto leyo ecacisa ukuba le nto ayisiyongxaki yomgangatho wesixhobo, kodwa imiselwa yindlela yokusebenza ye-amplifier.
Inzuzo encinci yesiginali ≠ inzuzo yokwenyani:
1. Ukuphikisana okungundoqo: Inzuzo eboniswe kwiphepha leenkcukacha (umz. 30dB) yinzuzo encinci yesignali, elixabiso elifanelekileyo lokulinganisa xa amandla esignali yokufaka ephantsi kakhulu (umz. -20~-30dBm) nakumandla epompo alinganisiweyo. Oku akulingana nenzuzo yokwenyani xa amandla esignali yokufaka ephezulu kwizicelo ezisebenzayo.
2. Isizathu esiphambili sokwehla kwenzuzo:
2.1 Ukwanda komthamo: Njengoko amandla esignali yokufaka esanda, i-EDFAIsandisi-lizwi sokubonaingena kwindawo yokugcwala, nto leyo ebangela ukuba inzuzo yehle ukusuka kwixabiso layo eliphezulu.
2.2 Ukuguqulwa kwengxolo ye-ASE: Ingxolo ye-Amplified spontaneous emission (ASE) ikhuphisana nokukhanya kwesiginali kwaye itya amandla epompo alinganiselweyo. Okukhona ingxolo ye-ASE inamandla, kokukhona i-gain esebenzayo esetyenziselwa ukukhulisa ukukhanya kwesiginali iphantsi. Esi sesinye sezizathu ezibalulekileyo zokuba i-gain elinganisiweyo iphantsi kunexabiso eliqhelekileyo.
2.3 Ubudlelwane bobungakanani: Okukhona amandla esignali yokufaka ephezulu, kokukhona ukucinezelwa kwenzuzo yokwenyani (G_actual) inkulu xa kuthelekiswa nokungenelwa kwesignali encinci (G_small). Ubungakanani bokucinezelwa buvela ikakhulu kuxinzelelo lokugcwala (Δ G_sat) kunye nokungenelwa kokusetyenziswa kwengxolo ye-ASE (Δ G_ASE). Umzekelo, xa amandla okufaka eyi-0dBm, kuqhelekile ukuba inzuzo elinganisiweyo ibe ngaphezulu kwe-3dB ngaphantsi kwexabiso eliqhelekileyo.
3. Iingcebiso zokuziqhelanisa nobunjineli:
3.1 Uhlahlo-lwabiwo mali lwekhonkco: Ukwanda kwesignali encinci akufuneki kusetyenziswe ngokuthe ngqo ekubaleni, kodwa kufuneka kwamkelwe ifomula yohlahlo-lwabiwo mali lwekhonkco olusengqiqweni ngakumbi:
P_out ≈ P_in+G_small-NF-3dB (umda wokhuseleko)
Phakathi kwazo, i-NF yingxolo (ixabiso eliqhelekileyo yi-4-6dB).
3.2 Ukulinganisa okungasemva: Ukuba amandla okukhupha alinganisiweyo awahambelani nohlahlo-lwabiwo mali lwefomula, ifomula ingasetyenziselwa ukubala umfanekiso wengxolo yenkqubo yokwenyani (NF) ngasemva, ngaloo ndlela ivumela uyilo lwekhonkco oluchanekileyo kunye nokulinganisa.
Isiphelo: Xa uvavanya kwaye usebenzisaI-EDFAI-Optical Amplifier, iinjineli kufuneka ziqwalasele amandla azo esignali yokungenisa kwaye ziqonde uphawu lwe-gain compression phantsi kweemeko eziphezulu zesignali. Xa kuyilwa ikhonkco, uhlahlo-lwabiwo mali kufuneka lusekelwe kumandla okufaka kunye neefomyula zobunjineli ezibandakanya i-noise factor kunye nomda wokhuseleko, endaweni yokuxhomekeka nje kwixabiso eliqhelekileyo le-small signal gain kwiphepha leenkcukacha. Emva kokufumana i-EDFA Optical Amplifier, qala ubuze ukuba yintoni amandla okufaka, uze usebenzise ifomula yebhajethi yekhonkco ukubala isiphumo esilindelekileyo. Musa ukusebenzisa i-small signal gain ekucwangciseni uhlahlo-lwabiwo mali lwamandla apheleleyo.
Ixesha leposi: Epreli-27-2026