基于数字微镜器件的多通道C波段可调谐光纤激光器

Multi-Channel C-Band-Tunable Fiber Lasers Based on Digital-Micromirror-Device Processor

可调谐光纤激光器可广泛应用于光纤通信、光纤传感、激光光谱、精密测量和激光加工等诸多领域。针对目前可调谐激光器在调谐性、灵活性、稳定性和多波长功率均衡性等方面的不足，提出一类新型的基于数字微镜器件（DMD）的多波长宽带可调谐光纤激光器。该激光器利用关键器件DMD作为波长调谐器，掺铒光纤作为激光增益介质，通过巧妙的光学设计，实现仅利用一块DMD芯片独立、灵活、稳定调谐多波长激光输出的目的。该激光器具有3个输出通道，各通道之间独立开关控制，每个通道均可实现波长在1530-1560 nm之间的连续可调谐输出，波长调谐精度0.055 nm/pixel，边模抑制比大于55 dB，激光输出功率最大值为10 mW，2 h内的中心波长漂移小于0.02 nm。

Tunable fiber lasers are widely applied in fiber communication, optical fiber sensing, laser spectroscopy, precision measurement and laser processing etc. Considering of the deficiencies of current tunable lasers in tuning, flexibility, stability and multi-wavelength power equalization, a novel C-band tunable multi-channel fiber laser based on a digital micromirror device （DMD） is proposed. This tunable laser uses erbium-doped fibers as the laser gain medium and an opto-DMD processor as a tuner to dynamically select arbitrary lasing wavelength. The laser has three tunable output channels in 1530-1560 nm with resolution of 0.055 nm/pixel, and each channel can be controlled independently. The side mode suppression ratio of laser signals is greater than 55 dB. The maximum laser output power is about 10 mW and the fluctuation of the center wavelength within 2 h is below 0.02 nm.