A simple and cost-effective multi-wavelength fiber ring laser based on a chirped Moiré fiber grating (CMFG) and a semiconductor optical amplifier (SOA) is proposed. Stable triple-wavelength lasing oscillations at room temperature are experimentally demonstrated. The measured optical signal-to-noise ratio (SNR) reaches the highest value of 50 dB and the power fluctuation of each wavelength is less than 0.2 dB within a 1-h period. To serve as a wavelength selective element, the CMFG possesses excellent comb-like filtering characteristics including stable wavelength interval and ultra-narrow passband, and its fabrication method is easy and flexible. The lasing oscillation shows a narrower bandwidth than SOA-based multi-wavelength fiber lasers utilizing some other kinds of wavelength selective components. Methods to optimize the laser performance are also discussed.

提出一种基于啁啾莫尔光纤光栅(CMFG)和掺铒光纤放大器(EDFA)的可调多波长激光器,其结构简单、降低了成本,并实验验证了室温下稳定的激光输出。作为波长选择器件,啁啾莫尔光栅具有优良的梳妆滤波特性,包括稳定的信道间隔、超窄的通带带宽,而且制作方法简单灵活。实验测得的光信噪比达到50dB,在一个小时的观测时间内,各波长激光输出的功率抖动均小于0.5dB,各信道的输出功率均衡,差值小于1dB。讨论了优化该激光器输出性能的方法,并用实验结果证明了基于啁啾莫尔光栅激光器结构的优势。

高性能的波分复用器是密集波分复用系统的核心器件之一，重叠写入啁啾光纤光栅型带通滤波器充分发挥了光纤光栅优良的波长选择特点，是一种低成本的新型全光纤波分复用器件。综合评述了各种不同结构的重叠写入啁啾光纤光栅型滤波器的工作原理、基本特点及其应用。