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Tunable single-mode laser on thin film lithium niobate
Optics Letters
|November 1, 2021
Summary
We developed a tunable laser on erbium-doped lithium niobate on insulator (LNOI) for photonic integrated circuits. This device achieves single-mode laser operation with high side mode suppression, tunable via temperature and coupling gap adjustments.
Area of Science:
- Photonics
- Materials Science
- Integrated Optics
Background:
- Erbium-doped lithium niobate on insulator (LNOI) is crucial for advanced photonic integrated circuits (PICs).
- Whispering gallery mode (WGM) lasers offer compact and efficient light sources.
- Developing tunable single-mode lasers is essential for versatile PIC applications.
Purpose of the Study:
- To demonstrate an integrated tunable whispering gallery single-mode laser (WGSML) on LNOI.
- To investigate wavelength tuning mechanisms for WGSMLs.
- To achieve high performance in terms of side mode suppression ratio (SMSR).
Main Methods:
- Fabrication of a coupled microdisk and microring resonator on LNOI.
- Utilizing a 974 nm single-mode pump laser for WGM excitation.
- Employing temperature control and adjustable coupling gap width for tuning.
Main Results:
- Achieved a WGSML at 1560.40 nm with a maximum SMSR of 31.4 dB.
- Demonstrated wavelength tuning from 1560.30 to 1560.40 nm via temperature regulation.
- Obtained WGSMLs at 1560.60 nm and 1565.00 nm by altering the coupling gap.
Conclusions:
- The coupled microdisk-microring LNOI structure is effective for generating tunable WGSMLs.
- Temperature and coupling gap are viable methods for tuning WGSML output.
- Future work can leverage the electro-optic effect for finer wavelength control.
