Zhang Aiqin, Jin Yanbing, Feng Xinhuan, Zhou Jingjuan, Li Zhaohui, Guan Bai-Ou
Institute of Photonics Technology, Jinan University, Guangzhou, China.
Opt Express. 2013 Jul 15;21(14):16928-33. doi: 10.1364/OE.21.016928.
In this paper, we propose and demonstrate a technique to realize multiwavelength operation in erbium-doped fiber lasers (EDFLs) by inserting two Fabry Pérot laser diodes (FP-LDs) in the laser cavity respectively in cascaded and parallel way. The FP-LDs not only act as wavelength selection elements, but also offer optical gain or loss for the operation wavelengths in the laser cavity. The gains or losses for the oscillation wavelengths obtained from FP-LDs differ with adjustment of the driving current of the FP-LDs. Thus, the utilization of the FP-LDs in the laser cavity can introduce wavelength dependent gain or loss which can effectively suppress the competition caused by the homogeneous gain broadening of the erbium-doped fiber (EDF). As a result, 16-wavelength and 20-wavelength operation with a wavelength-spacing of 1.25 nm has been achieved respectively in the cascaded and parallel FP-LDs based EDFL schemes. The measured power fluctuation of each wavelength is smaller than 0.4dB for both EDFLs. Furthermore, the injection locking of the FP-LDs ensures a narrow linewidth of the EDFL output and the linewidth is estimated to be narrower than 100 MHz for the cascaded scheme based EDFL.
在本文中，我们提出并演示了一种通过分别以级联和平行方式在激光腔内插入两个法布里-珀罗激光二极管（FP-LD）来实现掺铒光纤激光器（EDFL）多波长运转的技术。FP-LD不仅充当波长选择元件，还为激光腔内的运转波长提供光学增益或损耗。从FP-LD获得的振荡波长的增益或损耗会随着FP-LD驱动电流的调整而不同。因此，在激光腔内使用FP-LD可以引入与波长相关的增益或损耗，这可以有效抑制掺铒光纤（EDF）均匀增益展宽引起的竞争。结果，在基于级联和平行FP-LD的EDFL方案中分别实现了波长间隔为1.25nm的16波长和20波长运转。两种EDFL的各波长测量功率波动均小于0.4dB。此外，FP-LD的注入锁定确保了EDFL输出的窄线宽，对于基于级联方案的EDFL，估计线宽窄于100MHz。
