Wang Shuo, Lv Min, Zhang Yuxuan, Chen Xiao
Appl Opt. 2018 Oct 20;57(30):8845-8850. doi: 10.1364/AO.57.008845.
A wavelength-spacing-controllable multi-wavelength polarization-maintaining erbium-doped fiber laser (MW-PM-EDFL) in a linear cavity configuration is presented based on a Lyot-Sagnac filter and a nonlinear optical loop mirror (NOLM). Using a Lyot-Sagnac filter as the wavelength selective filter makes the wavelength spacing controllable by adjusting the effective length of polarization-maintained fiber (PMF) segments. An NOLM inducing wavelength-dependent cavity loss can be used as an amplitude equalizer, which is employed to suppress the mode competition resulting from the homogeneous line broadening effect of the erbium-doped fiber in the cavity. Thus, a stable wavelength-spacing-controllable MW-PM-EDFL is realized. In this experiment, 20 stable lasing wavelengths are obtained with a pump power of 170 mW at 980 nm when the length of the PMF is 13 m. When the length of the PMF is 8 m, 10 stable lasing wavelengths are obtained at 185 mW pump power. The power fluctuations and wavelength shifts are less than 2 dB and 0.02 nm in 1 h at room temperature. The demonstrated multi-wavelength fiber laser has great potential for applications in optical communications and optical sensing systems.
基于利奥滤光器和非线性光学环镜（NOLM），提出了一种线性腔结构的波长间距可控的多波长保偏掺铒光纤激光器（MW-PM-EDFL）。使用利奥滤光器作为波长选择滤波器，通过调整保偏光纤（PMF）段的有效长度来实现波长间距可控。一个能引起与波长相关的腔损耗的NOLM可用作幅度均衡器，用于抑制腔内掺铒光纤均匀线宽效应导致的模式竞争。这样，就实现了一个稳定的波长间距可控的MW-PM-EDFL。在本实验中，当PMF长度为13米时，在980纳米处泵浦功率为170毫瓦的情况下获得了20个稳定的激射波长。当PMF长度为8米时，在185毫瓦泵浦功率下获得了10个稳定的激射波长。在室温下，1小时内功率波动和波长漂移小于2分贝和0.02纳米。所展示的多波长光纤激光器在光通信和光传感系统中具有巨大的应用潜力。
