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Cryogenic electro-optic polarisation conversion in titanium in-diffused lithium niobate waveguides
Optics Express
|October 29, 2020
Summary
This study demonstrates a novel electro-optic polarization converter for quantum photonics operating at cryogenic temperatures. The device, built on lithium niobate waveguides, successfully converts light polarization at 0.8 K, enabling integrated cryogenic photonic systems.
Area of Science:
- Quantum Photonics
- Cryogenic Engineering
- Materials Science
Background:
- Quantum photonic technologies often necessitate cryogenic operating conditions.
- Active photonic components like switches and modulators must be compatible with low temperatures.
- Integrating active components with cryogenic systems presents a significant engineering challenge.
Purpose of the Study:
- To demonstrate an electro-optic polarization converter suitable for cryogenic environments.
- To enable active control of light polarization in quantum photonics at low temperatures.
- To develop a compatible platform for integrated cryogenic photonic devices.
Main Methods:
- Fabrication of titanium in-diffused lithium niobate waveguides.
- Characterization of polarization conversion efficiency at 1550 nm wavelength.
- Operation and testing of the device at cryogenic temperatures (0.8 K).
Main Results:
- Achieved fiber-to-fiber transmission greater than 43% at 0.8 K.
- Demonstrated a modulation depth of 23.6±3.3 dB.
- Obtained a conversion voltage-length product of 28.8 V cm.
Conclusions:
- The developed electro-optic polarization converter is compatible with cryogenic conditions.
- This technology facilitates the integration of active photonic components into cryogenic systems.
- Enables advancements in quantum photonics requiring low-temperature operation.
