Opt Lett. 2013 Dec 15;38(24):5220-3. doi: 10.1364/OL.38.005220.
We propose and experimentally demonstrate an effective spectral linewidth suppression scheme for a commercial tunable laser source. By using a long-cavity, narrow-bandwidth stimulated Brillouin scattering filter and multifrequency-selection mechanism simultaneously, a single-longitudinal-mode laser output with linewidth suppression from ~3 MHz to less than 20 kHz is successfully achieved in the whole C-band. Meanwhile, insertion loss of ~5 dB and a side-mode suppression ratio improvement of ~20 dB at a typical output wavelength of 1552.520 nm are obtained. The scheme is experimentally verified to be wavelength independent in the C-band and characterized with good performance of wavelength and power stability.
我们提出并实验验证了一种用于商用可调谐激光源的有效光谱线宽抑制方案。通过同时使用长腔、窄带宽受激布里渊散射滤波器和多频率选择机制，成功地在整个 C 波段实现了线宽从3MHz 抑制到小于 20kHz 的单纵模激光输出。同时，在典型的输出波长 1552.520nm 处，获得了5dB 的插入损耗和~20dB 的边模抑制比改善。该方案在 C 波段的实验验证表明其与波长无关，并且具有良好的波长和功率稳定性。
