Integrated narrow-linewidth laser source based on self-injection locking

Zhuopei Yu; Ke Yin; Chenxi Zhang; Runlin Miao; Weihong Hua; Tian Jiang

doi:10.1117/12.2666966

21 March 2023 Integrated narrow-linewidth laser source based on self-injection locking

Zhuopei Yu, Ke Yin, Chenxi Zhang, Runlin Miao, Weihong Hua, Tian Jiang

Proceedings Volume 12595, Advanced Fiber Laser Conference (AFL2022); 125950A (2023) https://doi.org/10.1117/12.2666966
Event: Advanced Fiber Laser Conference (AFL2022), 2022, Changsha, China

Abstract

Chip-scale narrow-linewidth lasers have rich applications in sensing, communication, spectroscopy and light detection and ranging (LiDAR). Self-injection locking is one of the most efficient techniques to reduce linewidth significantly. By locking a laser to an external cavity, some amounts of light reflect back into the laser for mode competition, leading to a significant reduction of the lasing linewidth. In this work, we demonstrated a hybrid-integrated laser with a Microring Resonator (MRR) butt-coupled to a Distributed Feedback (DFB) laser. The radius of the MMR is designed to be 442.3 μm, corresponding to a Free Spectral Range (FSR) of about 50 GHz. And the MMR has a quality factor (Q factor) of 3×10⁶ , fabricated in an ultralow loss silicon nitride (Si₃N₄) waveguide platform. In this way, the frequency noise has been reduced to 12.565 Hz²/Hz at the 10 MHz offset frequency. Finally, 40 Hz intrinsic linewidth and 91.2 kHz integral linewidth are achieved, characterized by a delayed self-heterodyne interferometer.

Citation Download Citation

Zhuopei Yu, Ke Yin, Chenxi Zhang, Runlin Miao, Weihong Hua, and Tian Jiang "Integrated narrow-linewidth laser source based on self-injection locking", Proc. SPIE 12595, Advanced Fiber Laser Conference (AFL2022), 125950A (21 March 2023); https://doi.org/10.1117/12.2666966

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