Mode-locked lasers with low noise performance, such as low timing jitter and relative intensity noise are essential for high-precision applications. In this letter, we demonstrated a 122-MHz all-polarization-maintaining mode-locked Er-doped fiber laser based on a nonlinear amplifying loop mirror. A hybrid component integrating a wavelength division multiplexer and a phase shifter is applied to increase the repetition rate. The relative intensity noise is 0.004% and 0.76% rms (integrated from 1 MHz to 100 Hz) from two output ports. The timing jitter characteristic is measured by the delayed optical heterodyne method. The timing jitter is ~1.9 fs rms (integrated from 1 MHz to 10 Hz) of both two output ports. The origin of the timing jitter of this laser is analyzed numerically based on the well-established theoretical model using the laser’s repetition rate, cavity dispersion, etc.

中文翻译：

---

122MHz 全保偏 NALM 锁模光纤激光器的定时抖动和强度噪声表征

具有低噪声性能（例如低定时抖动和相对强度噪声）的锁模激光器对于高精度应用至关重要。在这封信中，我们展示了一种基于非线性放大环路镜的 122 MHz 全偏振保持锁模掺铒光纤激光器。应用集成了波分复用器和移相器的混合组件来提高重复率。来自两个输出端口的相对强度噪声为 0.004% 和 0.76% rms（从 1 MHz 到 100 Hz 积分）。定时抖动特性通过延迟光外差法测量。两个输出端口的定时抖动约为 1.9 fs rms（从 1 MHz 到 10 Hz 积分）。