Experimental Studies on the Noise Properties of the Harmonics From a Passively Mode-Locked Er-Doped Fiber Laser

IEEE Photonics Journal

Jiazheng Song¹  Yishan Wang¹  Jianguo Zhang¹  Hushan Wang¹  Xiaohong Hu²  Yuanshan Liu²  Tao Duan² 

[1] State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi&x0027;an, China;

关键词: Passively mode-locked laser;    timing jitter;    phase noise;    harmonic order;   

DOI  :  10.1109/JPHOT.2019.2937324

来源: DOAJ

【 摘 要 】

We experimentally investigate the noise properties of a homemade 586 MHz mode-locked laser (MLL). The variation of the timing jitter versus the harmonic order is measured, which is consistent with the theoretical analyses. The dominant contributions to the timing jitter are detailedly studied by analyzing the phase noises at different harmonic frequencies. For low-order harmonics, the intensity noise and relative-intensity-noise-coupled (RIN-coupled) jitter mainly contribute to the timing jitter, while for high-order harmonics, the amplified spontaneous emission (ASE) noise makes the dominant contribution. Then we find that a higher output ratio has an obvious improvement on reducing the timing jitter and suppressing the phase noise because of the shorter pulse duration and lower net cavity dispersion caused by the higher output ratio. Finally a comparison of the noise performance between the MLL and a commercial signal generator is made, which shows that the optically generated radio-frequency signal (OGRFS) has a lower phase noise at high offset frequencies, however the higher phase noise at low offset frequencies leads to a higher timing jitter than the commercial SG.

【 授权许可】

Unknown