Imiyalelo ekhethekile ye-erbium-doped fiber amplifier (i-EDFA Optical Amplifier)

Imiyalelo ekhethekile ye-erbium-doped fiber amplifier (I-EDFA Optical Amplifier)
Uthenge i-i-amplifier yefayibha efakwe i-erbium(I-EDFA Optical Amplifier) ​​enencazelo yokukhuphuka okungu-30dB kanye namandla okukhipha ukugcwala angu-+20dBm.
Xhuma ukukhanya kokufaka okungu-0dBm bese ufunda umphumela ongu-+27dBm. Ungabala ukuthi u-30-3=27, futhi inzuzo ayiyona inkinga.
Kodwa kuthiwani uma ufaka i--20dBm? Inzuzo elinganiselwe ye-30dB isho ukuthi okukhiphayo kufanele kube+10dBm, kodwa isilinganiso sangempela singu-+7dBm kuphela – okungaphansi kwe-3dB egcwele. Lokhu akuyona inkinga yekhwalithi. I-30dB iyinzuzo encane yesiginali, kuyilapho umsindo we-ASE kanye nesibalo somsindo kudla inzuzo yakho. Eqinisweni, inzuzo elinganiselwe ivame ukuwela ngaphansi kwenzuzo elinganiselwe, okucacisa ukuthi lesi simo asiyona inkinga yekhwalithi yemishini, kodwa kunalokho sinqunywa yindlela yokusebenza ye-amplifier.

Inzuzo encane yesiginali ≠ inzuzo yangempela:

1. Ukuphikisana okuyinhloko: Inzuzo ekhonjiswe ephepheni lokucacisa (isb. 30dB) iyinzuzo encane yesignali, okuyinani elifanele lokulinganisa lapho amandla esignali yokufaka ephansi kakhulu (isb. -20~-30dBm) kanye namandla epompo alinganisiwe. Lokhu akulingana nenzuzo yangempela lapho amandla esignali yokufaka ephezulu ekusetshenzisweni okusebenzayo.
2. Isizathu esiyinhloko sokwehla kwenzuzo:
2.1 Ukwanda kokugcwala: Njengoba amandla esignali yokufaka ekhuphuka, i-EDFAI-Amplifier Yokukhanyaingena esifundeni sokugcwala, okubangela ukuthi inzuzo yehle kusukela enanini layo eliphezulu.
2.2 Ukuphambukiswa komsindo we-ASE: Umsindo we-Amplified spontaneous emission (ASE) uncintisana nokukhanya kwesiginali futhi usebenzisa amandla ephampu alinganiselwe. Uma umsindo we-ASE unamandla, kulapho inzuzo ephumelelayo esetshenziswa ukukhulisa ukukhanya kwesiginali incipha khona. Lesi ngesinye sezizathu eziyisisekelo zokuthi kungani inzuzo elinganisiwe iphansi kunenani elijwayelekile.
2.3 Ubudlelwano obunobuningi: Uma amandla esignali yokufaka ephezulu, kulapho ukucindezelwa kwenzuzo yangempela (G_actual) kukhulu khona uma kuqhathaniswa nokukhuphuka kwesignali encane (G_small). Inani lokucindezelwa livela kakhulu ekucindezelweni kokugcwala (Δ G_sat) kanye nokukhuphuka kokusetshenziswa komsindo we-ASE (Δ G_ASE). Isibonelo, lapho amandla okufaka engu-0dBm, kuvamile ukuthi inzuzo elinganisiwe ibe ngaphezu kuka-3dB ngaphansi kwenani elijwayelekile.
3. Iziphakamiso zokuzijwayeza ubunjiniyela:
3.1 Isabelomali sesixhumanisi: Ukwanda kwesignali encane akufanele kusetshenziswe ngqo ekubaleni, kodwa kufanele kusetshenziswe ifomula yesabelomali sesixhumanisi esingokoqobo:
I-P_out ≈ P_in+G_small-NF-3dB (umkhawulo wokuphepha)
Phakathi kwazo, i-NF iyisibalo somsindo (inani elijwayelekile lingu-4-6dB).
3.2 Ukulinganisa okuphambene: Uma amandla okukhipha alinganisiwe engahambisani nesabelomali sefomula, ifomula ingasetshenziswa ukubala isibalo sangempela somsindo wesistimu (NF) ngokuphambene, ngaleyo ndlela ivumele ukwakheka kwesixhumanisi nokulinganisa okunembe kakhudlwana.

Isiphetho: Lapho kuhlolwa futhi kusetshenziswaI-EDFAI-Optical Amplifier, onjiniyela badinga ukunaka amandla abo esignali yokufaka futhi baqonde isici sokucindezelwa kwe-gain ngaphansi kwezimo eziphezulu zesignali. Lapho beklama isixhumanisi, isabelomali kufanele sisekelwe kumandla okufaka angempela kanye namafomula obunjiniyela afaka phakathi isici somsindo kanye nomkhawulo wokuphepha, kunokuthembela nje enanini elijwayelekile le-small signal gain ephepheni lokucacisa. Ngemuva kokuthola i-EDFA Optical Amplifier, qala ubuze ukuthi iyini amandla okufaka, bese usebenzisa ifomula yesabelomali sesixhumanisi ukuze ubale umphumela olindelekile. Ungasebenzisi i-small signal gain ukuze uhlele isabelomali samandla aphelele.