We report on an effective and universal technique to fulfill intensity noise suppression for single-frequency fiber lasers (SFFLs) at 1.5 μm. Utilizing a gain-saturated semiconductor optical amplifier and the effective filtering of amplified spontaneous emission, the resultant relative intensity noises of three diverse SFFLs are maintained at −155 dB Hz⁻¹; which is only <0.9 dB from the shot noise limit in the frequency range from 100 kHz to 50 MHz. Refering to the three paradigmatic experimental results, this technology, as a promising external solution of noise suppression, can be modularized to promote the application of SFFLs.

我们报告了一种有效且通用的技术，可在 1.5 μ m处实现单频光纤激光器 (SFFL) 的强度噪声抑制。利用增益饱和的半导体光放大器和放大的自发辐射的有效过滤，三个不同SFFL的合成相对强度噪声保持在-155 dB Hz ^-1；在 100 kHz 至 50 MHz 的频率范围内，它与散粒噪声限值仅相差 <0.9 dB。参考三​​个范例实验结果，该技术作为一种很有前景的噪声抑制外部解决方案，可以模块化以促进SFFL的应用。