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Highly optical feedback-tolerant single-mode monolithic coupled-cavity laser with a high-Q deformed square microcavity.

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Title: Highly optical feedback-tolerant single-mode monolithic coupled-cavity laser with a high-Q deformed square microcavity.
Authors: Dong, Zhong1,2 (AUTHOR), Hu, Biwei1,2 (AUTHOR), Zhang, Zhenning1,2 (AUTHOR), Shi, Yang1,2 (AUTHOR), Hu, Zunhao1,2 (AUTHOR), Chen, Youling1,2 (AUTHOR), Xiao, Jinlong1,2 (AUTHOR), Yang, Yuede1,2 (AUTHOR) yyd@semi.ac.cn, Huang, Yongzhen1,2 (AUTHOR) yzhuang@semi.ac.cn
Source: Optics & Laser Technology. Dec2025:Part E, Vol. 192, pN.PAG-N.PAG. 1p.
Subjects: Optical feedback, Microcavity lasers, Cavity resonators, Photolithography, Lasers, Whispering gallery modes, Photon counting
Abstract: • Effectively suppresses the higher-order whispering-gallery modes and enables stable lasing a high- Q coupled mode. • The laser maintains excellent single-mode operation even at an optical feedback intensity ratio of -11 dB. • Significantly improves the single-mode performance and noise characteristics of traditional monolithic coupled-cavity lasers. • Fabricated using regrowth-free planar fabrication techniques via i-line photolithography, offering simplicity and low cost. We have proposed and experimentally demonstrated an external optical feedback insensitive coupled-cavity laser featuring a deformed square microcavity. By optimizing the microcavity structure, we effectively suppress higher-order whispering-gallery modes, enabling stable lasing in a high-quality (Q) coupled mode with excellent single-mode characteristics and low relative intensity noise. Through the synergistic effect of introducing high- Q lasing mode and increasing the photon number ratio within the microcavity, the deformed coupled-cavity laser achieves significantly enhanced feedback tolerance compared to the conventional design, maintaining stable single-mode operation even at a feedback intensity ratio of −11 dB. Furthermore, owing to the elimination of complex fabrication processes, this laser presents a promising solution for isolator-free light sources in future photonic integrated circuits. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• Effectively suppresses the higher-order whispering-gallery modes and enables stable lasing a high- Q coupled mode. • The laser maintains excellent single-mode operation even at an optical feedback intensity ratio of -11 dB. • Significantly improves the single-mode performance and noise characteristics of traditional monolithic coupled-cavity lasers. • Fabricated using regrowth-free planar fabrication techniques via i-line photolithography, offering simplicity and low cost. We have proposed and experimentally demonstrated an external optical feedback insensitive coupled-cavity laser featuring a deformed square microcavity. By optimizing the microcavity structure, we effectively suppress higher-order whispering-gallery modes, enabling stable lasing in a high-quality (Q) coupled mode with excellent single-mode characteristics and low relative intensity noise. Through the synergistic effect of introducing high- Q lasing mode and increasing the photon number ratio within the microcavity, the deformed coupled-cavity laser achieves significantly enhanced feedback tolerance compared to the conventional design, maintaining stable single-mode operation even at a feedback intensity ratio of −11 dB. Furthermore, owing to the elimination of complex fabrication processes, this laser presents a promising solution for isolator-free light sources in future photonic integrated circuits. [ABSTRACT FROM AUTHOR]
ISSN:00303992
DOI:10.1016/j.optlastec.2025.113985