Isimiso kanye nokusetshenziswa kwe-EDFA erbium-doped fiber amplifier

Isimiso kanye nokusetshenziswa kweI-amplifier yefayibha efakwe i-erbium ye-EDFA

Isakhiwo esiyisisekelo seI-EDFAi-amplifier yefayibha efakwe i-erbium, eyakhiwa kakhulu yi-medium esebenzayo (i-fibre ye-quartz efakwe i-doped engamamitha amaningi ubude, ububanzi obuyi-core 3-5 microns, ukuhlushwa kwe-doping (25-1000)x10-6), umthombo wokukhanya kwephampu (990 noma 1480nm LD), i-optical coupler kanye ne-optical isolator. Ukukhanya kwesignali kanye nokukhanya kwephampu kungasakazeka ohlangothini olufanayo (co-pumping), ohlangothini oluphambene (reverse pumping), noma zombili izinkomba (bidirectional pumping) ku-Erbium fiber. Lapho ukukhanya kwesignali kanye nokukhanya kwephampu kufakwa ku-erbium fiber ngesikhathi esifanayo, i-erbium ion ivuselelwa ezingeni lamandla aphezulu (uhlelo olunezinga ezintathu) ngaphansi kwesenzo sokukhanya kwephampu, futhi ngokushesha ibola ibe ezingeni elizinzile. Uma ibuyela esimweni somhlaba ngaphansi kwesenzo sokukhanya kwesignali yesigameko, i-photon ehambisana nokukhanya kwesignali iyakhishwa, ukuze isignali ikhuliswe. I-spectrum yayo ye-amplified spontaneous emission (ASE) ine-bandwidth enkulu (efika ku-20-40nm) futhi inama-peak amabili ahambisana ne-1530nm kanye ne-1550nm ngokulandelana.

Izinzuzo eziyinhloko zeIsikhulisi se-EDFAkukhona inzuzo ephezulu, i-bandwidth enkulu, amandla aphezulu okukhipha, ukusebenza kahle kokupompa okuphezulu, ukulahlekelwa okuphansi kokufakwa, kanye nokungazweli ezimweni zokwehlukaniswa.

Isimiso sokusebenza se-erbium-doped fiber amplifier

I-amplifier yefayibha efakwe i-Erbium（I-EDFA Optical Amplifier） Yakhiwe kakhulu nge-fiber efakwe i-erbium (cishe ubude obuyi-10-30m) kanye nomthombo wokukhanya wephampu. Umgomo osebenzayo ukuthi i-fiber efakwe i-erbium ikhiqiza imisebe evuselelwe ngaphansi kwesenzo somthombo wokukhanya opompiwe (ubude be-wavelength 980nm noma i-1480nm), futhi ukukhanya okukhishwe imisebe kuyashintsha ngokushintsha kwesignali yokukhanya okufakwayo, okulingana nokukhulisa isignali yokukhanya okufakwayo. Imiphumela ikhombisa ukuthi inzuzo ye-amplifier ye-fiber efakwe i-Erbium ngokuvamile ingama-15-40db, futhi ibanga lokudlulisela lingandiswa ngamakhilomitha angaphezu kuka-100. Ngakho-ke, abantu abakwazi ukuzibamba kodwa babuze: kungani ososayensi bacabanga ukusebenzisa i-erbium efakwe i-doped ku-fiber amplifier ukwandisa ubukhali bamaza okukhanya? Siyazi ukuthi i-erbium iyinto engavamile yomhlaba, futhi izinto ezingavamile zomhlaba zinezici zazo ezikhethekile zesakhiwo. Ukufaka i-doped izinto ezingavamile zomhlaba kumadivayisi okukhanya kuye kwasetshenziswa isikhathi eside ukuthuthukisa ukusebenza kwamadivayisi okukhanya, ngakho-ke lokhu akuyona into eyenzeka ngengozi. Ngaphezu kwalokho, kungani ubude be-wavelength yomthombo wokukhanya wephampu bukhethwa ku-980nm noma ku-1480nm? Eqinisweni, ubude be-wavelength yomthombo wokukhanya wephampu bungaba ngu-520nm, 650nm, 980nm, kanye no-1480nm, kodwa umkhuba ubonise ukuthi ubude be-wavelength bokusebenza kahle kwe-laser yomthombo wokukhanya wephampu ongu-1480nm buphakeme kakhulu, kulandelwe ubude be-wavelength yomthombo wokukhanya wephampu ongu-980nm.

Isakhiwo somzimba

Isakhiwo esiyisisekelo se-erbium-doped fiber amplifier (EDFA Optical Amplifier). Kukhona i-isolator ekugcineni kokufaka kanye nokuphela kokukhipha, inhloso ukwenza isignali ye-optical idluliselwe ngendlela eyodwa. I-pump exciter inobude be-wavelength obungu-980nm noma u-1480nm futhi isetshenziselwa ukunikeza amandla. Umsebenzi we-coupler ukuhlanganisa isignali ye-optical yokufaka kanye nokukhanya kwephampu ku-fiber e-erbium-doped, nokudlulisela amandla okukhanya kwephampu ku-signal ye-optical yokufaka ngesenzo se-fiber e-erbium-doped, ukuze kufezwe ukwandiswa kwamandla kwesignali ye-optical yokufaka. Ukuze kutholakale amandla aphezulu okukhipha kanye nenkomba yomsindo ephansi, i-Erbium-doped fiber amplifier esetshenziswa ngokoqobo isebenzisa isakhiwo semithombo emibili noma ngaphezulu yephampu ene-isolators phakathi ukuze ihlukanise. Ukuze kutholakale i-gain curve ebanzi nethambile, kufakwe isihlungi se-gain flattening.

I-EDFA inezingxenye ezinhlanu eziyinhloko: i-Erbium-doped fiber (EDF), i-Optical coupler (WDM), i-optical isolator (ISO), i-Optical Filter, kanye ne-Pumping Supply. Imithombo yephampu evame ukusetshenziswa ifaka phakathi i-980nm ne-1480nm, futhi le mithombo emibili yephampu inokusebenza kahle kokupompa okuphezulu futhi isetshenziswa kakhulu. I-coefficient yomsindo womthombo wokukhanya wephampu engu-980nm iphansi; Umthombo wokukhanya wephampu engu-1480nm unokusebenza kahle kokupompa okuphezulu futhi ungathola amandla amakhulu okukhipha (cishe i-3dB ephakeme kunomthombo wokukhanya wephampu ongu-980nm).

inzuzo

1. Ubude besikhathi sokusebenza buhambisana nefasitela lokunciphisa okuncane le-fiber yemodi eyodwa.

2. Ukusebenza kahle kokuhlanganisa. Ngenxa yokuthi iyi-fiber amplifier, kulula ukuyihlanganisa ne-transmission fiber.

3. Ukusebenza kahle kokuguqulwa kwamandla aphezulu. Ingaphakathi le-EDF lincane kunele-fiber yokudlulisa, futhi ukukhanya kwesiginali kanye nokukhanya kwephampu kudluliselwa ngasikhathi sinye ku-EDF, ngakho-ke amandla okukhanya agxile kakhulu. Lokhu kwenza ukusebenzisana phakathi kokukhanya kanye ne-gain medium Er ion kugcwele kakhulu, kuhlanganiswe nobude obufanele be-fiber efakwe i-erbium, ngakho ukusebenza kahle kokuguqulwa kwamandla okukhanya kuphezulu.

4. Ukwanda okuphezulu, inkomba yomsindo ophansi, amandla amakhulu okukhipha, ukukhuluma okuphansi phakathi kweziteshi.

5. Izici zokuzuza okuzinzile: I-EDFA ayizweli ekushiseni, futhi inzuzo ayinakho ukuhlobana okuncane ne-polarization.

6. Isici senzuzo asincikile kwisilinganiso se-bit yesistimu kanye nefomethi yedatha.

ukushiyeka

1. Umphumela ongewona owe-linear: I-EDFA yandisa amandla okukhanya ngokwandisa amandla okukhanya afakwe ku-fiber, kodwa uma emakhulu kungcono. Lapho amandla okukhanya ekhuliswa ngezinga elithile, umphumela ongewona owe-linear we-fiber optical uzokhiqizwa. Ngakho-ke, uma kusetshenziswa ama-amplifiers e-fiber optical, kufanele kuqashelwe inani lokulawula amandla okukhanya e-fiber optical angenayo esiteshi esisodwa.

2. Ububanzi be-gain wavelength buzinzile: ububanzi be-wavelength yokusebenza ye-C-band EDFA bungu-1530nm ~ 1561nm; Ububanzi be-wavelength yokusebenza ye-L-band EDFA bungu-1565nm ~ 1625nm.

3. Ububanzi bokukhuphuka okungalingani: Ububanzi bokukhuphuka kwe-EDFA erbium-doped fiber amplifier bubanzi kakhulu, kodwa ububanzi bokukhuphuka kwe-EDF ngokwayo abulingani. Isihlungi sokuguguleka kumele samukelwe ukuze kuncishiswe ukukhuphuka ohlelweni lwe-WDM.

4. Inkinga yokwanda kokukhanya: Uma indlela yokukhanya ijwayelekile, ama-ion e-erbium avuselelwa ukukhanya kwephampu athwalwa ukukhanya kwesignali, ngaleyo ndlela kuqedelwa ukwandiswa kokukhanya kwesignali. Uma ukukhanya kokufaka kufinyezwa, ngoba ama-ion e-erbium aqinile aqhubeka nokuqongelela, uma ukufakwa kokukhanya kwesignali sekubuyiselwe, amandla azogxuma, okuholela ekukhuphukeni kokukhanya.

5. Isixazululo sokukhuphuka kwe-optical ukuqaphela umsebenzi wokunciphisa amandla okukhanya okuzenzakalelayo (i-APR) noma umsebenzi wokuvala amandla okukhanya okuzenzakalelayo (i-APSD) ku-EDFA, okungukuthi, i-EDFA yehlisa amandla ngokuzenzakalelayo noma icisha amandla ngokuzenzakalelayo uma kungekho ukukhanya kokufaka, ngaleyo ndlela icindezela ukwenzeka kwesenzakalo sokukhuphuka.

Imodi yohlelo lokusebenza

1. I-booster Amplifier isetshenziselwa ukukhulisa amandla ezibonakaliso eziningi ze-wavelength ngemuva kwe-booster wave, bese izidlulisela. Njengoba amandla esignali ngemuva kwe-booster wave ngokuvamile emakhulu, inkomba yomsindo kanye nokwanda kwe-power amplifier akuphezulu kakhulu. Inamandla amakhulu okukhipha.

2. I-Line-amplifier, ngemva kwe-Power Amplifier, isetshenziswa njalo ukukhokhela ukulahlekelwa kokudluliselwa komugqa, ngokuvamile edinga inkomba yomsindo encane kanye namandla amakhulu okukhanya okukhiphayo.

3. I-Pre-Amplifier: Ngaphambi kwe-splitter nangemva kwe-line amplifier, isetshenziselwa ukukhulisa isignali nokuthuthukisa ukuzwela kwe-receiver (uma isilinganiso se-optical signal-to-noise (OSNR) sihlangabezana nezidingo, amandla amakhulu okufaka angacindezela umsindo we-receiver uqobo futhi athuthukise ukuzwela kokwamukela), futhi inkomba yomsindo incane kakhulu. Akukho mfuneko enkulu emandleni okukhipha.