期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 40, 期 16, 页码 5575-5582出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2022.3179828
关键词
Optical fibers; Optical fiber amplifiers; Optical fiber dispersion; Nonlinear optics; Frequency modulation; Fiber nonlinear optics; Modulation; Direct modulation; microlasers; octave-spanning; optical frequency comb
资金
- National Nature Science Foundation of China [61527823]
- National Key R&D Program of China [2016YFB0402304]
In this study, an octave-spanning 10-GHz optical comb is achieved using a directly-modulated microlaser, and the optical pulse width is further reduced to 140 fs in a fiber through optimal chirp compensation.
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.
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