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Polarization-analyzing circuit on InP for integrated Stokes vector receiver.
Optics Express
|August 9, 2017
Summary
This study presents an integrated polarization-analyzing circuit for Stokes vector (SV) receivers, reducing costs for optical communications. The device accurately retrieves the state-of-polarization (SOP) and is robust against fabrication errors.
Area of Science:
- Optoelectronics
- Photonics
- Optical Communications
Background:
- Next-generation short-reach optical networks require cost-effective solutions.
- Stokes vector modulation and direct detection (SVM/DD) offers potential for cost reduction.
- Integrated photonic circuits are key for miniaturization and performance.
Purpose of the Study:
- To propose and demonstrate an InGaAsP/InP waveguide-based polarization-analyzing circuit for integrated Stokes vector (SV) receivers.
- To enable accurate retrieval of the input state-of-polarization (SOP) using simple calculations.
- To show the robustness of the proposed device against fabrication errors.
Main Methods:
- Designing and fabricating an InGaAsP/InP waveguide-based polarization-analyzing circuit.
- Utilizing half-ridge waveguides for the photonic integrated circuit (PIC).
- Transforming the input SOP and projecting its SV onto three different vectors on the Poincare sphere.
Main Results:
- Demonstrated successful detection of different SOPs scattered on the Poincare sphere.
- Showed that the actual SOP can be retrieved by simple calculation.
- Revealed the flexibility of the projection matrix and its calibratability against device imperfections.
Conclusions:
- The proposed integrated polarization-analyzing circuit is effective for SV receivers.
- The device offers robustness against fabrication errors, crucial for practical implementation.
- This technology can contribute to cost reduction in short-reach optical communication networks.
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