Alexander J K, Morrissey P E, Yang H, Yang M, Marraccini P J, Corbett B, Peters F H
Opt Express. 2016 Apr 18;24(8):7960-5. doi: 10.1364/OE.24.007960.
A monolithically integrated low linewidth optical comb is demonstrated by gain switching of a three-section laser device. The device consists of a slave and master section separated by a shared slotted mirror section. Wavelength tunability has been demonstrated by varying the electrical bias of each section. The number of comb lines is shown to almost double with the addition of optical injection from the master section into the slave. The unmodulated device has a full width half max linewidth of ∼ 500 kHz, while the comb line set were measured to be ∼ 600 kHz, with little degradation as a result of gain switching. The FSR (free spectral range) of the demonstrated comb is 4 GHz, which is tunable within the bandwidth of the device, with a central wavelength of 1580.3 nm.
通过对三段式激光器件进行增益开关操作，展示了一种单片集成的低线宽光学频率梳。该器件由通过共享开槽镜部分隔开的从段和主段组成。通过改变每个段的电偏置，已证明了波长可调性。从主段向从段添加光注入后，梳状线的数量几乎增加了一倍。未调制的器件半高全宽线宽约为500kHz，而梳状线组经测量约为600kHz，增益开关导致的退化很小。所展示的频率梳的自由光谱范围（FSR）为4GHz，在器件带宽内可调，中心波长为1580.3nm。
