Self-injection locking narrow linewidth laser based on Si3N4 microring resonator

Yudong Li; Wei Li; Liangsen Feng; Shaowu Chen; Xiaokuan Li; Yali Liu

doi:10.1117/12.2667427

6 March 2023 Self-injection locking narrow linewidth laser based on Si₃N₄ micro ring resonator

Yudong Li, Wei Li, Liangsen Feng, Shaowu Chen, Xiaokuan Li, Yali Liu

Proceedings Volume 12553, Fourth International Conference on Optoelectronic Science and Materials (ICOSM 2022); 125530O (2023) https://doi.org/10.1117/12.2667427
Event: 2022 4th International Conference on Optoelectronic Science and Materials (ICOSM2022), 2022, Henfei, China

Abstract

The self-injection locking based on the microcavity can be generated when the microcavity is directly pumped by the laser diode, and the linewidth can be narrowed. In this work, we used a DFB laser to pump a silicon nitride (Si₃N₄) micro ring resonator (MRR) with a 5e5 quality (Q) factor. Tapered fiber was used for the chip waveguide end face coupling. The transmission spectrum and wavelength locking region were obtained by scanning the drive current of laser diode. 0.09 nm width locking region was achieved at 1552.6 nm. Finally, the linewidth of the output laser was measured using path modulation non-zero frequency self-heterodyne interference method. Linewidth narrowing was found by comparing free running state and self-injection locking state of the laser diode. The experiment results show five times linewidth narrowing. The self-injection locking laser based on Si₃N₄ MRR is realized through fiber coupling, which is simple and compact in structure and significantly reduces the difficulty of optical alignment. At the same time, it can obtain extremely narrow linewidth, which has broad application prospects in precision metrology, optical fiber sensing, optical communication.

Citation Download Citation

Yudong Li, Wei Li, Liangsen Feng, Shaowu Chen, Xiaokuan Li, and Yali Liu "Self-injection locking narrow linewidth laser based on Si₃N₄ micro ring resonator", Proc. SPIE 12553, Fourth International Conference on Optoelectronic Science and Materials (ICOSM 2022), 125530O (6 March 2023); https://doi.org/10.1117/12.2667427

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KEYWORDS

Semiconductor lasers

Silicon

Resonators

Waveguides

Absorption

Fiber lasers

Laser resonators

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