Zonke-ifayibha enye-frequency DFB laser

Zonke-ifayibha enye-frequencyDFB laser

Uyilo lwendlela yokubona

Ubude obuphakathi be-laser ye-DFB ye-fiber yesiqhelo yi-1550.16nm, kwaye i-side-to-side rejection ratio inkulu kune-40dB. Ngenxa yokuba i-20dB yobubanzi bomgca aDFB ifayibha laseryi-69.8kHz, ikwaziwa ukuba ububanzi bayo be-3dB yi-3.49kHz.

Inkcazo yendlela yokubona

1. Inkqubo ye-laser ene-frequency enye

Indlela yokukhanya yenziwe ngamacandelo abonayo angenakwenziwa afana ne-976 nm emponthiweyo.laser, π -phase shift grating, i-erbium-doped fiber, kunye ne-wavelength division multiplexer. Umgaqo osebenzayo kukuba ukukhanya kwempompo okwenziwa yi-laser ye-976 nm pumped kuphuma kumkhuseli wempompo kwaye kwahlulahlulwe kwiindlela ezimbini. I-20% yokukhanya kwempompo idlula kwi-980nm ekupheleni kwe-1550/980nm ye-wavelength division multiplexer kwaye ingena kwi-π -phase shift grating. I-laser yomthombo wembewu ephumayo ixhunyiwe kwi-1550 nm ekupheleni kwe-1550 / 980nm WDM emva kokudlula i-fiber isolator. I-80% yokukhanya kwepompo kudityaniswa nge-1550/980 nm ye-wavelength division multiplexer ibe yi-2 m erbium-doped gain fiber EDF yokutshintshiselana kwamandla, ukufezekisa ukukhulisa amandla e-laser.

Ekugqibeleni, i-laser output iphunyezwa nge-ISO. I-laser ephumayo ixhunywe ngokulandelelana kwi-spectrometer (OSA) kunye nemitha yamandla optical (PM) yokubeka iliso kwi-laser output spectrum kunye namandla e-laser. Onke amacandelo enkqubo yonke yendlela ye-optical path adityaniswe nge-fiber optic fusion splicer, ukuphumeza ulwakhiwo lwenkqubo yefiber optical ngokupheleleyo kunye nobude bomgodi omalunga neemitha ezili-10. I-loop yenkqubo yokulinganisa ububanzi bomgca iqulunqwe ngezi zixhobo zilandelayo: ezimbini i-3 dB i-fiber couplers ye-fiber, i-50 km ye-SM-28e i-single-mode ye-fiber optical delay line, i-40 MHz.imodyuli ye-acouste-optic, ngokunjalo aifotodetectorkunye ne-spectrum analyzer.

2. Iiparamitha zesixhobo:

I-EDF: I-wavelength yokusebenza ikwi-band ye-C, i-aperture yamanani ngu-0.23, i-absorption peak yi-1532 nm, ixabiso eliqhelekileyo ngu-33 dB / m, kunye nokulahlekelwa kwe-welding ngu-0.2 dB.

Umkhuseli wempompo: Inokubonelela ngokhuseleko lwempompo kwi-800 ukuya kwi-2000 nm band, kunye ne-wavelength ephakathi ye-976 nm kunye nomthamo wokuphatha amandla we-1 W.

I-Optical fiber coupler: Iqonda ukuhanjiswa okanye indibaniselwano yamandla ophawu lokukhanya. I-1 * 2 i-fiber optical coupler, ene-splitting ratio ye-20: 80%, i-wavelength esebenzayo ye-976nm, kunye ne-mode-mode eyodwa.

I-Wavelength division multiplexer: Iqaphela ukudibanisa kunye nokwahlulwa kweempawu ezimbini ze-optical zamanqanaba ahlukeneyo, i-980 / 1550 nm WDM. Ifiber ekupheleni kwempompo yi-Hi1060, kunye nefiber kwisiphelo esiqhelekileyo kunye nesiphelo somqondiso yi-SMF-28e.

I-Optical fiber isolator: Ikhusela umthombo wokukhanya ukuba ungachatshazelwa kakubi kukukhanya okubonakaliswe ngasemva, kunye ne-wavelength esebenzayo ye-1550nm, i-bipolar isolator, kunye namandla optical aphezulu e-1W.