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Fully tunable optical filter based on a thin-film lithium niobate microring resonator
Optics Letters
|March 13, 2026
Summary
A novel tunable optical filter on thin-film lithium niobate offers independent control over extinction ratio, wavelength, and bandwidth. This compact device enables advanced reconfigurable photonic systems.
Area of Science:
- Photonics
- Materials Science
- Electrical Engineering
Background:
- Integrated photonic devices are crucial for advanced optical systems.
- Thin-film lithium niobate (TFLN) offers excellent electro-optic properties for miniaturized devices.
Purpose of the Study:
- To demonstrate a fully tunable optical filter on a TFLN platform.
- To achieve independent and simultaneous control over key filter parameters.
Main Methods:
- Fabrication of a compact TFLN optical filter (2.5 mm x 1.2 mm).
- Integration of three electro-optic phase shifters for device tuning.
- Characterization of extinction ratio, resonant wavelength, and stopband width tuning ranges.
Main Results:
- Achieved an extinction ratio tuning range from 0 dB to 31 dB.
- Demonstrated stopband width variation between 8.8 GHz and 9.6 GHz at maximum extinction.
- Observed linear stopband center wavelength shift with a tuning efficiency of 1.95(8) pm/V.
Conclusions:
- A compact, electro-optically reconfigurable filter architecture with independent multi-parameter control is presented.
- The demonstrated TFLN filter is suitable for on-chip photonic systems requiring flexible optical signal manipulation.
