偏振控制C波段波长可调谐掺铒光纤激光器

C-Band Wavelength Tunable Erbium Doped Fiber Laser with Polarization Control

报道了一种结构简单的波长可调谐掺铒光纤激光器。该光纤激光器由增益平坦型掺铒光纤放大器（EDFA）、偏振相关光隔离器、光纤偏振控制器及输出耦合器组成。利用光纤偏振控制器和偏振相关光隔离器作为波长调谐器件，实现了光纤激光器的波长可调谐输出及双波长输出。利用琼斯矩阵理论分析了光纤激光器腔内不同波长的损耗与偏振控制器状态的关系，指出通过调节光纤偏振控制器，光纤激光器可以实现波长可调谐输出，同时阐述了光纤激光器双波长输出的机制。实验上获得了中心波长在1542～1564nm连续可调，平均功率大于2．6mw，边模抑制比大于35dB的连续激光输出。同时获得了波长为1549nm和1564nm的双波长连续激光输出。

A simple wavelength tunable erbium doped fiber laser, with a fiber polarization controller and a polarization dependent isolator （PDI） as wavelength selective devices, is theoretically and experimentally demonstrated, which consists of gain flattened erbium doped fiber amplifier （EDFA）, polarization dependent isolator, fiber polarization controller, and output coupler. The polarization induced losses of different wavelengths were analyzed with Jones matrix; theoretical result showed that wavelength-tunability and dual-wavelength operation of the fiber laser could be obtained by adjusting the polarization controller. A tunable range from 1542 nm to 1564 nm, the side-mode suppression ratio above 35 dB and average output power over 2.6 mW were achieved for this fiber laser. Dual-wavelength operation at 1549 nm and 1564 nm of the fiber laser was also obtained.