A tunable multiwavelength fiber laser (MWFL) based on bidirectional semiconductor optical amplifier (SOA) in conjunction with a Sagnac loop mirror (SLM) interferometer is proposed. The best multiwavelength spectrum from this setup produces 164 lasing lines within 3 dB uniformity. The main study is to investigate the multiwavelength laser performance by varying the polarization state (PS) at two different locations of polarization controller (PC). Manipulation of a quarter-wave plate (QWP) of PC1 causes PS change before entering polarization-maintaining fiber (PMF) thus affecting the multiwavelength flatness and wavelength bandwidth. Meanwhile, manipulation of QWP of PC2 varied the output power of polarization beam splitter (PBS) and tuned the multiwavelength spectrum with almost similar performance. The multiwavelength tunability, extinction ratio (ER) difference and lasing lines difference is five nm, 2.4 dB and 48 when the QWP angle is adjusted from 0° until 70°, respectively. Lower SOA current reduced the multiwavelength flatness and number of lines. The laser output was found stable at a maximum of 0.31 dB power deviation during the 100 min of stability test.

提出了一种基于双向半导体光放大器（SOA）的可调谐多波长光纤激光器（MWFL），并结合了萨格纳克环形镜（SLM）干涉仪。通过这种设置获得的最佳多波长光谱可产生164条激光线，其均匀度在3 dB之内。主要研究是通过在偏振控制器（PC）的两个不同位置改变偏振态（PS）来研究多波长激光器的性能。操纵PC1的四分之一波片（QWP）会导致PS在进入保偏光纤（PMF）之前发生变化，从而影响了多波长平坦度和波长带宽。同时，PC2的QWP操作改变了偏振分束器（PBS）的输出功率，并以几乎类似的性能调谐了多波长光谱。多波长可调性 当QWP角度从0°调整到70°时，消光比（ER）差和激光线差分别为5 nm，2.4 dB和48 dB。较低的SOA电流会降低多波长平坦度和线数。在100分钟的稳定性测试中，发现激光输出在最大0.31 dB的功率偏差下是稳定的。