基于法布里-珀罗激光器自注入锁定的波长可调谐激光器

Tunable Laser Based on Fabry-Perot Laser Self Injection Locking

提出了一种基于法布里-珀罗(F-P)激光器自注入锁定的可调谐激光器方案。F-P标准具从F-P激光器多纵模光谱滤出单个纵模,再注入F-P激光器,抑制边模,实现激光器单模运转。通过快速调谐F-P激光器驱动电流,改变F-P激光器的梳状多纵模光谱,利用变化的F-P激光器梳状光谱和固定的F-P标准具梳状透过谱的游标效应,实现波长的大范围调谐。对快速波长可调谐激光器的静态特性进行研究,得到18组可用单纵模,调谐范围为1535.2~1548.68nm,单纵模的边模抑制比为40dB,各波长输出功率差异小于15dBm,频率间隔为100GHz。对快速波长可调谐激光器进行波长调谐实验,不同波长之间的调谐时间在60~100ns范围内,验证了该方案的可行性。

A novel tunable laser based on Fabry-Perot （F-P） laser self injection locking is proposed. A single longitudinal mode is filtered from the multi-longitudinal modes of the F-P laser by the F-P etalon and injected back into the F-P laser to suppress side mode. We can change the spectrum of the F-P laser by tuning the driving current rapidly, and realize a wide tuning range of the wavelength by virtue of the vernier effect between the varying spectrum of the F-P laser and the stable spectrum of the F-P etalon. The static characteristics of the tunable laser are studied and 18 sets of single longitudinal modes are available. The tuning range of wavelength is from 1535.2 nm to 1548.68 nm, and the side mode suppression ratio of the single longitudinal mode is 40 dB. The power difference of each wavelength is less than 15 dBm and the frequency interval is 100 GHz. A wavelength tuning experiment is carried out, and the tuning time for different wavelengths ranges from 60 ns to 100 ns. The feasibility of the scheme is verified.