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Updated: Oct 2, 2025
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
Published on: September 5, 2019
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Compact symmetric polarization rotator-splitter on InP
Optics Express
|February 25, 2022
Summary
A novel symmetric polarization rotator-splitter (PRS) was demonstrated on InP. This device efficiently splits transverse-electric (TE) and transverse-magnetic (TM) light components using a multimode-interference splitter and adiabatic taper, simplifying fabrication.
Area of Science:
- Photonics and Optical Engineering
- Semiconductor Device Physics
Background:
- Polarization rotator-splitters (PRS) are crucial for manipulating light polarization in optical systems.
- Existing PRS designs often involve complex asymmetric structures that are difficult to fabricate, particularly on Indium Phosphide (InP) substrates.
Purpose of the Study:
- To propose and experimentally demonstrate a novel symmetric polarization rotator-splitter (PRS) on an InP platform.
- To develop a PRS that eliminates complex asymmetric structures, thereby simplifying fabrication and reducing device length.
Main Methods:
- Utilizing a symmetric multimode-interference (MMI) splitter at the output of an adiabatic taper section.
- Designing the adiabatic taper as a mode-evolution-based polarization converter to minimize device length.
- Fabricating the device using a simple single-etching process on InP.
Main Results:
- Achieved a total device length of 750 µm.
- Demonstrated a polarization extinction ratio exceeding 16.3 dB.
- Measured a polarization-dependent loss of 0.67 dB at a 1550-nm wavelength.
Conclusions:
- The proposed symmetric PRS design on InP is effective and simplifies fabrication.
- The device achieves high performance metrics, making it suitable for integrated photonic applications.
- This work presents a significant advancement in the development of compact and easily manufacturable polarization control devices.
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