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Electro-optically tunable microring laser monolithically integrated on lithium niobate on insulator
Optics Letters
|April 30, 2021
Summary
We integrated an electro-optic tunable microring laser on a lithium niobate on insulator (LNOI) platform. This device enables wavelength tuning via electric voltage, achieving a high quality factor and low lasing threshold.
Area of Science:
- Photonics
- Materials Science
- Integrated Optics
Background:
- Lithium niobate on insulator (LNOI) is a key platform for integrated photonics.
- Electro-optic (EO) tunable lasers are crucial for optical communication and sensing.
Purpose of the Study:
- To demonstrate monolithic integration of an EO tunable microring laser on LNOI.
- To characterize the performance of the integrated laser, including its quality factor, lasing threshold, and tunability.
Main Methods:
- Fabrication using photolithography assisted chemo-mechanical etching.
- Evanescent coupling of a pump laser into an erbium-doped LNOI microring resonator.
- Electrical tuning using integrated microelectrodes.
Main Results:
- Achieved a high quality factor of 1.54 x 10^5 at 1542 nm.
- Observed lasing action with a low pump power threshold below 3.5 mW.
- Demonstrated electro-optic tuning with a coefficient of 0.33 pm/V.
Conclusions:
- Successful monolithic integration of an EO tunable microring laser on LNOI.
- The device exhibits excellent optical properties and electro-optic tunability.
- This work paves the way for advanced photonic integrated circuits.
