Author(s): Wu, JL (Wu, Ji-Liang); Guo, XH (Guo, Xiaohui); Jiao, YD (Jiao, Yadong); Zhang, XC (Zhang, Xucheng); Wang, T (Wang, Ting); Yang, YD (Yang, Yue-De); Xiao, JL (Xiao, Jin-Long); Zhang, DM (Zhang, Daming); Qin, GS (Qin, Guanshi); Huang, YZ (Huang, Yong-Zhen)

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY Volume: 40 Issue: 16 Pages: 5575-5582 DOI: 10.1109/JLT.2022.3179828 Published: AUG 15 2022

Abstract: A coherent optical frequency comb with a gigahertz line spacing is important in diverse fields, such as calibration of astronomical spectrographs and wavelength division multiplexing optical communications. In this paper, we realize octave-spanning 10-GHz optical combs using a directly-modulated 1.55 mu m microlaser as a seeding source. A 6.4 ps transform-limited pulse is successfully generated from the directly-modulated laser output through optimal chirp compensation in a fiber. Moreover, after amplifying by an EDFA, the optical pulse width is further reduced to 140 fs by combing the self-phase modulation effect and the anomalous group velocity dispersion in commercial fibers. Finally, a coherent optical comb spanning from 900-2400 nm is produced in a home-made fluorotellurite fiber using the 140-fs pulse boosted to a few Watts as a seeding source. The experimental results demonstrate that optical combs generated from the directly-modulated microlaser have the potential for a fully stabilized frequency comb.

Accession Number: WOS:000837749900024

ISSN: 0733-8724

eISSN: 1558-2213

Full Text: https://ieeexplore.ieee.org/document/9788070