Stable and channel spacing tunable of SOA-based multiwavelength fiber laser utilizing parallel Lyot filter

IF 3 Q3 Physics and Astronomy

Results in Optics Pub Date : 2025-09-03 DOI:10.1016/j.rio.2025.100890

Norasmahan Muridan , Abdul Hadi Sulaiman , Siti Fatimah Norizan , Siti Azlida Ibrahim , Nelidya Md Yusoff

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Abstract

We proposed the generation of a tunable channel-spacing in a multiwavelength fiber laser that incorporates a semiconductor optical amplifier (SOA) and a parallel Lyot filter. Previously, only a few works demonstrated channel spacing tunability using parallel Lyot filter, with none of them utilizing SOA. A stable and tunable multiwavelength spectrum with up to three distinct channel spacings is demonstrated using three different sets of parallel Lyot filter either Short, Long, and Mixed based on varying lengths of polarization-maintaining fiber (PMF). Channel spacing tunability is achieved by selecting different PMF length combinations. Experimental results show that two channel spacing modes, either single or multiple, can be selected for each configuration. Additionally, increasing the SOA drive current results in a greater number of lasing lines with higher intensity within the cavity. The system demonstrates good stability, with peak power differences of 1.46 dB, 0.65 dB, and 2.61 dB for the Short, Long, and Mixed sets, respectively, during a 60-minute observation period.

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利用平行Lyot滤波器实现soa多波长光纤激光器的稳定和通道间距可调

我们提出了在多波长光纤激光器中产生可调谐的通道间距，该激光器包含半导体光放大器（SOA）和并行Lyot滤波器。以前，只有少数作品使用并行Lyot滤波器演示了通道间隔可调性，没有一个使用SOA。基于不同长度的保偏光纤（PMF），使用三组不同的平行Lyot滤波器（短、长和混合），展示了具有多达三个不同通道间隔的稳定可调多波长光谱。通道间距可调性是通过选择不同的PMF长度组合来实现的。实验结果表明，每种配置可选择单通道或多通道间距模式。此外，增加SOA驱动电流会导致腔内具有更高强度的激光线数量增加。系统表现出良好的稳定性，在60分钟的观测期内，Short、Long和Mixed三组的峰值功率差分别为1.46 dB、0.65 dB和2.61 dB。

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