10 GHz超低抖动光短脉冲源

10 GHz Short Optical Pulses Source with Ultra-Low Jitter

报道了一种新型的重复频率为10 GHz,脉宽为5.3 ps,抖动为184 fs的高稳定光短脉冲源.将大信号调制半导体激光器产生的10 GHz光脉冲,先送入LiNbO3电光相位调制器增强负啁啾,并使光谱进一步展宽,再通过色散补偿光纤(DCF)压缩脉冲啁啾,可得到光短脉冲.由于大信号调制激光器输出的光脉冲本身具有负啁啾,而通过相位调制器的光脉冲在不同的时间间隔内既有正啁啾也有负啁啾,通过适当调整进入相位调制器的光脉冲时延,使其通过相位调制器后累加产生更大的负啁啾,再利用正色散光纤压缩啁啾,从而得到低抖动且无基座的光短脉冲.

The highly stable 5.3 ps wide optical pulse source with a repetition rate of 10 GHz, and 184 fs timing jitter is reported. 10 GHz optical pulses generated by a deeply directly modulated laser （DML）enter a LiNbO3 eleetroopite phase modulator to enhance the negative chirp and enlarge pulse width, and pass through dispersion compensation fibers （DCF） to compress chirps. The optical pulses generated by DML have negative chirp, and phase modulation can generate both positive and negative chirp at different timing intervals. By appropriately tuning optical time delay before optical pulses enter the phase modulator, the output optical pulses can have more negative chirp. Then, the chirped optical pulses can be compressed into low timing-jitter short pulses without pedestal by positive dispersion fiber.