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Integrated dual-polarization coherent receiver without a polarization splitter-rotator.
Optics Express
|March 17, 2021
Summary
We developed a novel integrated dual-polarization coherent receiver without a polarization splitter-rotator. This simplified design reduces footprint and fabrication complexity for advanced optical communication systems.
Area of Science:
- Photonics and Optical Communications
- Integrated Optics
- Coherent Detection
Background:
- Coherent receivers are crucial for high-capacity optical communication.
- Traditional dual-polarization coherent receivers often require complex polarization splitter-rotators (PSRs).
- Minimizing component count and footprint is essential for scalable photonic integration.
Purpose of the Study:
- To propose and demonstrate a simplified integrated dual-polarization coherent receiver.
- To eliminate the need for a polarization splitter-rotator (PSR) in the receiver architecture.
- To enable efficient signal retrieval with reduced optical complexity.
Main Methods:
- A novel concept mixing dual-polarization (DP) signals with local-oscillator (LO) waves in a single interferometer.
- Utilizing five single-ended photodetectors for signal detection.
- Employing differential detection to eliminate signal-signal and LO-LO beat noises.
Main Results:
- Successful design and fabrication of a proof-of-concept device on Indium Phosphide (InP).
- Experimental demonstration of complete retrieval of DP quadrature phase-shift keyed (QPSK) signals.
- Validation of noise elimination through differential detection.
Conclusions:
- The proposed receiver architecture significantly simplifies DP coherent detection.
- The absence of a PSR leads to a reduced footprint and easier fabrication, particularly for InP and silicon photonic platforms.
- This approach offers a promising solution for next-generation optical transceivers.
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