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Electro-optically tunable optical delay on a lithium niobate photonic chip
Optics Letters
|July 1, 2024
Summary
This study demonstrates continuous tuning of on-chip optical delay using a microring resonator and an electro-optic tunable coupler. The device achieves a wide dynamic range and efficient delay tuning with low voltage control.
Area of Science:
- Photonics
- Integrated Optics
- Optical Communications
Background:
- Microring resonators are key components in integrated photonics for wavelength filtering and signal processing.
- Precise control over optical delay is crucial for applications like optical signal processing and buffering.
Purpose of the Study:
- To propose and demonstrate a novel approach for continuous tuning of on-chip optical delay.
- To utilize an electro-optically tunable waveguide coupler for dynamic control of microring resonator coupling regimes.
Main Methods:
- An electro-optically tunable waveguide coupler was introduced to control the coupling between a bus waveguide and a microring resonator.
- The coupling regime was tuned from under-coupling to over-coupling.
- Optical delay was experimentally characterized by measuring the relative phase shift between lasers.
Main Results:
- A large dynamic range of optical delay from -600 to 600 picoseconds was achieved.
- Efficient tuning of optical delay was demonstrated, with ranges from -430 to -180 picoseconds and 40 to 240 picoseconds.
- The tuning was accomplished using a low applied voltage of only 5 V.
Conclusions:
- The proposed approach enables continuous and efficient tuning of on-chip optical delay.
- The electro-optically tunable microring resonator offers a promising solution for dynamic optical delay lines in integrated photonic systems.
