Opt Lett. 2018 May 15;43(10):2396-2399. doi: 10.1364/OL.43.002396.
An optical frequency comb with mode spacing of 10 GHz operating in the c-band is produced from a harmonically mode-locked laser using a slab-coupled optical waveguide amplifier device with a fiber-coupled external cavity. An intracavity Fabry-Perot etalon serves as a high finesse optical filter for supermode suppression and as the reference for cavity length stabilization using a multi-combline Pound-Drever-Hall setup. The Allan deviation of a single optical combline near 193.4 THz is measured via a heterodyne beat with a cavity stabilized cw laser and reaches a minimum fractional frequency deviation of 3×10 at τ=30 ms. In addition, the phase noise of the photodetected pulsed output of the laser shows a timing jitter of <23 fs integrated from 1 Hz to the Nyquist frequency.
采用基于平板耦合波导放大器的光纤外腔结构，从锁模激光器中获得了中心波长在 C 波段、模式间隔为 10GHz 的光频梳。腔内法布里-珀罗标准具作为一个高精细度的光学滤波器，用于抑制超模，同时采用多 combline Pound-Drever-Hall 装置作为腔长稳定的参考。通过与腔稳连续波激光器进行外差拍频，测量了 193.4THz 附近单个光梳线的 Allan 偏差，在 τ=30ms 时达到了 3×10 的最小频率分数偏差。此外，激光探测到的脉冲输出的相位噪声在 1Hz 到奈奎斯特频率的积分中表现出<23fs 的定时抖动。
