Cheng Yuanbing, Luo Xianshu, Song Junfeng, Liow Tsung-Yang, Lo Guo-Qiang, Cao Yulian, Hu Xiaonan, Li Xiaohui, Lim Peng Huei, Wang Qi Jie
Opt Express. 2015 Mar 9;23(5):6392-9. doi: 10.1364/OE.23.006392.
We demonstrate electrically pumped two-section mode locked quantum well lasers emitting at the L-band of telecommunication wavelength on silicon utilizing die to wafer bonding techniques. The mode locked lasers generate pulses at a repetition frequency of 30 GHz with signal to noise ratio above 30 dB and 1 mW average output power per facet. Optical injection-locking scheme was used to improve the noise properties of the pulse trains of passively mode-locked laser. The phases of the mode-locked frequency comb are shown to be coherent with that of the master continuous-wave (CW) laser. The radio-frequency (RF)-line-width is reduced from 7.6 MHz to 150 kHz under CW optical injection. The corresponding pulse-to-pulse jitter and integrated RMS jitter are 29.7 fs/cycle and 1.0 ps, respectively. The experimental results demonstrate that optical injection can reduce the noise properties of the passively mode locked III-V/Si laser in terms of frequency linewidth and timing jitter, which makes the devices attractive for photonic analog-to-digital converters and clock generation and recovery.
我们展示了利用芯片到晶圆键合技术在硅基上实现的电泵浦两段锁模量子阱激光器，其在电信波长的L波段发射。锁模激光器以30 GHz的重复频率产生脉冲，信噪比高于30 dB，每面平均输出功率为1 mW。采用光注入锁定方案来改善被动锁模激光器脉冲序列的噪声特性。结果表明，锁模频率梳的相位与主连续波（CW）激光器的相位相干。在连续波光注入下，射频（RF）线宽从7.6 MHz降至150 kHz。相应的脉冲间抖动和积分均方根抖动分别为29.7 fs/周期和1.0 ps。实验结果表明，光注入可以在频率线宽和定时抖动方面降低被动锁模III-V/Si激光器的噪声特性，这使得这些器件对光子模数转换器以及时钟产生和恢复具有吸引力。
