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Integrated self-injection-locked narrow linewidth laser based on thin-film lithium niobate
Optics Express
|March 5, 2024
Summary
Integrated narrow linewidth lasers are crucial for optical communications. This study demonstrates a 2.5 kHz linewidth laser on lithium niobate, paving the way for advanced photonic integration.
Area of Science:
- Photonics
- Materials Science
- Optical Engineering
Background:
- Narrow linewidth lasers are essential for applications like coherent optical communications and atomic clocks.
- Lithium niobate on insulator (LNOI) is a promising platform for photonic integration due to its electro-optic and thermo-optic properties.
- Developing integrated light sources on LNOI is critical for large-scale photonic systems.
Purpose of the Study:
- To develop an integrated narrow linewidth laser using low-loss LNOI.
- To achieve linewidth narrowing through a microring external cavity.
- To enable on-chip integration of advanced optical devices.
Main Methods:
- A distributed feedback (DFB) laser was self-injection-locked to a multimode race-track add-drop microring resonator (MMRA-MRR) with a multimode interferometric coupler.
- The MMRA-MRR served as an external cavity to narrow the laser linewidth.
- Characterization of laser output power and side-mode suppression ratio.
Main Results:
- Achieved a narrow laser linewidth of 2.5 kHz.
- The integrated laser exhibited an output power of 3.18 mW.
- A side-mode suppression ratio of 60 dB was obtained.
Conclusions:
- Successfully demonstrated an integrated low-noise, narrow-linewidth laser on thin-film lithium niobate for the communication band.
- This work is significant for future all-optical device integration on LNOI.
- The developed laser has high potential for high-speed coherent optical communication systems.
