High linear polarization, narrow linewidth hybrid semiconductor laser with an external birefringence waveguide Bragg grating
- 29 September 2021
- journal article
- research article
- Published by Optica Publishing Group in Optics Express
- Vol. 29 (21), 33109-33120
- https://doi.org/10.1364/oe.431341
Abstract
We demonstrate a high linear polarization, narrow linewidth hybrid laser composed of a semiconductor gain chip and a high birefringence waveguide Bragg grating (WBG). The laser operates in the C-band, and a maximum output power of 8.07 mW is obtained in the fiber waveguide. With careful temperature tuning, the hybrid laser can operate in a single longitudinal mode state from above the threshold current to 410 mA. The side mode suppression ratio (SMSR) reaches a value of 50.2 dB, and the polarization extinction ratio exceeds 39.6 dB. We numerically analyze the linewidth suppression for the Bragg grating based on adiabatic chirp theory. The hybrid laser shows a narrow linewidth of 4.15 kHz and a low relative intensity noise (RIN) of <-155 dBc/Hz, providing a high-performance light source for coherent light communication.Funding Information
- National Natural Science Foundation of China (51672264, 61727822, 61874119, 11774343)
- Science and Technology Development Project of Jilin Province (20200401006GX)
- Finance Science and Technology Project of Hainan Province (ZDYF2020217)
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