This study presents two novel tunable erbium doped fiber ring laser (EDFRL) configurations based on loop EDFA design and double-pass EDFA design, respectively to achieve an ultra-wideband tuning range and stable single-longitudinal-mode lasing operation. A micro-electro-mechanical system (MEMS) based optical tunable band pass filter was utilized as the wavelength selection element. Output spectral and power characteristics of these EDFRLs were experimentally analyzed and discussed. The EDFRLs had moderate and stable output power level ($~$-3 dBm) over 70 nm tuning range that covers C+L band. Moreover, the proposed EDFRLs could also suppress the undesired multi-longitudinal-modes successfully and have a high ($~$60 dB) OSNR level in whole tuning range.

这项研究提出了两种新颖的可调谐掺do光纤环形激光器（EDFRL）配置，分别基于环路EDFA设计和双通道EDFA设计，以实现超宽带调谐范围和稳定的单纵模激光操作。基于微机电系统（MEMS）的光学可调带通滤波器被用作波长选择元件。对这些EDFRL的输出频谱和功率特性进行了实验分析和讨论。EDFRL具有中等且稳定的输出功率水平（$〜$-3 dBm）在覆盖C + L频段的70 nm调谐范围内。此外，提出的EDFRL还可以成功抑制不希望的多纵向模式，并且具有较高的（$〜$在整个调谐范围内的OSNR等级为60 dB。