期刊
IEEE PHOTONICS JOURNAL
卷 14, 期 1, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2022.3141424
关键词
Semiconductor lasers; Optical reflection; Optical feedback; Optical fibers; Laser feedback; Optical pulses; Waveguide lasers; Gain switching; integrated optics; optical frequency comb; self-injection locking
资金
- National Key Research and Development Program of China [2021YFB2800802]
- National Natural Science Foundation of China [61771285]
This study presents a hybrid integrated gain-switched optical frequency comb source with eight pure continuous comb lines, a narrow linewidth, and a large frequency spacing adjustment range. By coupling a silicon nitride microring reflector to a commercially available distributed feedback laser, the self-injection locking effect greatly enhances the carrier-to-noise ratio and phase correlation between comb lines. This cost-efficient and robust comb source has potential applications in areas such as radio over fiber and coherent optical communication.
A hybrid integrated gain-switched (GS) optical frequency comb (OFC) source with eight pure continuous comb lines within 3-dB of the spectral envelope peak and a narrow linewidth of 615 kHz is proposed and demonstrated by coupling a silicon nitride microring reflector (MRR) to a commercially available distributed feedback (DFB) laser. Due to the self-injection locking effect induced by the MRR, the carrier-to-noise ratio (CNR) and phase correlation between comb lines are greatly enhanced. In addition, benefiting from the unique merit of gain switching, the resultant comb can also achieve a large frequency spacing adjustment range from 5.55 GHz to 8.7 GHz. This work explores a cost-efficient and robust OFC source for numerous applications, such as radio over fiber (RoF) and coherent optical communication.
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