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为了实现高稳定性的可调谐激光输出,提出并设计了一种基于马赫-曾德(M-Z)结构和光纤光栅串结合的掺铒光纤激光器,在M-Z干涉结构的一个干涉臂中加入光学延迟线(ODL),实现对干涉间隔的灵活可调。系统结构设计采用976 nm波长的LD作为泵浦源,长度为6 m的掺铒光纤作为增益介质;采用光栅串将特定波长的光反射回环形腔形成振荡;采用M-Z结构产生梳状滤波用来对光栅串反射回的光进行选择;通过调节ODL来改变腔内损耗,进而实现激光的可调谐输出,并通过在系统中加入可饱和吸收体(SA)和子腔结构来抑制波长的跳变。实验中,在泵浦功率为100 mW时,实现了单波长双波长和三波长的稳定的激光输出。单波长共输出13个,调谐范围为1 570~1 596 nm,调谐间隔为2 nm,边模抑制比均大于50 d B。
In order to achieve a highly stable tunable laser output, an erbium-doped fiber laser based on a Mach-Zehnder (MZ) structure and a fiber grating array is proposed and designed. An optical delay line (ODL), to achieve flexible and adjustable interference interval. The system structure design adopts LD with 976 nm wavelength as pumping source and erbium-doped fiber with length 6 m as gain medium; grating with specific wavelength is used to reflect light of specific wavelength back into annular cavity to form oscillation; MZ structure is used to generate comb filtering Selecting the light reflected by the grating string; changing the cavity loss by adjusting the ODL to achieve a tunable output of the laser and suppressing the wavelength jump by adding a saturable absorber (SA) and a sub-cavity structure to the system. In the experiment, a stable laser output of single-wavelength dual-wavelength and triple-wavelength was achieved at a pump power of 100 mW. A total of 13 single-wavelength output, tuning range of 1 570 ~ 1 596 nm, tuning interval of 2 nm, side mode suppression ratio greater than 50 d B.