Hybrid integrated low-noise linear chirp frequency-modulated continuous-wave laser source based on self-injection to an external cavity

Liwei Tang; Hongxiang Jia; Shuai Shao; Sigang Yang; Hongwei Chen; Minghua Chen

doi:10.1364/PRJ.428837

Journals >Photonics Research >Volume 9 >Issue 10 >Page 1948 > Article

Photonics Research
Vol. 9, Issue 10, 1948 (2021)

Hybrid integrated low-noise linear chirp frequency-modulated continuous-wave laser source based on self-injection to an external cavity

Liwei Tang^1、2, Hongxiang Jia^1、2, Shuai Shao^1、2, Sigang Yang^1、2, Hongwei Chen^1、2, and Minghua Chen^1、2、*

Author Affiliations

¹Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

²Beijing National Research Center for Information Science and Technology (BNRist), Beijing 100084, China

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DOI: 10.1364/PRJ.428837 Cite this Article Set citation alerts

Liwei Tang, Hongxiang Jia, Shuai Shao, Sigang Yang, Hongwei Chen, Minghua Chen. Hybrid integrated low-noise linear chirp frequency-modulated continuous-wave laser source based on self-injection to an external cavity[J]. Photonics Research, 2021, 9(10): 1948 Copy Citation Text

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Abstract

A hybrid integrated low-noise linear chirp frequency-modulated continuous-wave (FMCW) laser source with a wide frequency bandwidth is demonstrated. By employing two-dimensional thermal tuning, the laser source shows frequency modulation bandwidth of 10.3 GHz at 100 Hz chirped frequency and 5.6 GHz at 1 kHz chirped frequency. The intrinsic linewidth of 49.9 Hz with 42 GHz continuous frequency tuning bandwidth is measured under static operation. Furthermore, by pre-distortion linearization of the laser source, it can distinguish 3 m length difference at 45 km distance in the fiber length measurement experiment, demonstrating its application potential in ultra-long fiber sensing and FMCW light detection and ranging.