Frequency noise performance improvement of mutually injection-locked semiconductor lasers. (3rd April 2019)

• Record Type: Journal Article
• Authors: Ma, Weichao; Xiong, Bing; Sun, Changzheng; Ke, Xu; Wang, Jian; Wang, Lai; Hao, Zhibiao; Han, Yanjun; Li, Hongtao; Yu, Jiadong; Luo, Yi
• Is Part Of: Applied physics express. Volume 12:Number 5(2019)
• Publication Date: 2019-04-03
• Subjects: mutual coupling -- frequency noise -- semiconductor lasers; Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/1882-0786/ab0af7
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: The frequency noise characteristic of lasers under mutual injection locking is investigated. Pronounced frequency noise suppression is demonstrated for two distributed feedback lasers mutually coupled through a fiber link with 60 ns delay, confirmed by both local oscillator heterodyne and delayed self-heterodyne methods. Locking can be secured for the weak-coupling regime and a locking map is derived. The frequency noise of the laser under mutual injection locking is found to improve with increasing coupling strength or injection current. The single-sided white frequency noise of the laser is estimated to be below 3 Hz 2 Hz −1, corresponding to an intrinsic linewidth narrower than 9.4 Hz.