C+L 波段宽带增益平坦铋基掺铒光纤放大器的设计

周亚训; 徐星辰

C+L 波段宽带增益平坦铋基掺铒光纤放大器的设计

Design of C+L-band broad gain-flattened bismuth-basederbium-doped fiber amplifier

摘要

摘要: 基于光纤放大器增益谱的宽带平坦化发展需要，设计了一个两段铋基掺铒光纤(Bi鄄EDF)级联并携带一个C 波段(1 530~1 565 nm)宽带光纤布拉格光栅(FBG)的双通结构型铋基掺铒光纤放大器 (Bi鄄EDFA)，从理论上研究了其对输入信号的放大特性。研究表明：FBG 的引入可以使C 和L 波段 (1 570~1 620 nm)信号分别经历不同长度Bi鄄EDF 的双向传输，各自获得高增益放大，实现增益谱的宽带平坦化。在200 mW 的1 480 nm 双向对称泵浦下，第一级和第二级Bi鄄EDF 长度分别为50 cm 和 170 cm 时，对于波长间隔为2 nm、每路功率为-30 dBm 的56 路C+L 波段信号的输入，Bi鄄EDFA 高于 30dB 的增益带宽达到了90nm(1530~1620nm)，平均增益为35.7dB，增益起伏仅为2.3dB。同时，噪声系数得到明显改善。研究结果对于研制具有宽带、增益平坦的C+L 波段Bi鄄EDFA 具有实际指导意义。

Abstract: Inordertomeetthedevelopingneedsofbroadamplificationaswellasgain-flattened operationforfiberamplifier,adouble-passstructureofbismuth-basederbium-dopedfiberamplifier(Bi- EDFA)withtheincorporationofC-band(1530-1565nm)broadfiberBragggrating(FBG)inbetweenthe twocascadedsegmentsofbismuth-basederbium-dopedfiber(Bi-EDF)wasdesigned,andtheamplifying performancesofBi-EDFAwerepresentedtheoretically.Theresultsindicatethatabroadamplification andgain-flattenedspectrumcanbeachievedwiththeaidofthesimultaneouslyobtainedhighgainofthe C-bandandL-band(1570-1620nm)signalsduetotheirexperiencingadifferentlengthbi-directional transmissioninBi-EDFaftertheincorporationofFBG.Againbandwidthof90cmwithaveragegain 35.7dBandgainvariationofapproximatelyupanddown2.3dBwithinthewavelengthrangefrom1530nmto1620nm areobtainedundertheconditionsofthe1480nmbi-directionalsymmetricalpumpingwithpumppower of200mW,thefirstandsecondBi-EDFlengthof50cmand170cm,and56-channelsignalsofC+L bandwithintervalof2nmandeachpowerof-30dBmareinputtedsimultaneously.Meanwhile,thenoisefigureofBi-EDFAisimprovedevidently.Thetheoreticalstudieswillprovidepracticalsignificancefora newdesignofC+L-bandBi-EDFAwithbroadandflattenedgain.

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