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Broadband and compact polarization beam splitter based on an asymmetrical directional coupler with extra optimizing
Applied Optics
|November 2, 2019
Summary
This study introduces a novel polarization beam splitter (PBS) using an asymmetrical directional coupler. It achieves high performance over a broad wavelength range with excellent fabrication tolerance.
Area of Science:
- Photonics
- Integrated Optics
- Waveguide Devices
Background:
- Polarization beam splitters (PBS) are fundamental components in photonic integrated circuits.
- Existing PBS designs often face limitations in bandwidth, insertion loss, or fabrication tolerance.
Purpose of the Study:
- To propose and analyze a novel PBS based on an asymmetrical directional coupler.
- To enhance the performance of the PBS through optimized design and additional structures.
- To demonstrate broadband operation and high fabrication tolerance.
Main Methods:
- Design of an asymmetrical directional coupler (DC) using a strip waveguide and a Si3N4 loaded horizontal slot waveguide.
- Utilizing the particle swarm optimizing (PSO) algorithm for parameter optimization.
- Numerical simulations to evaluate performance metrics like extinction ratio (ER) and insertion loss (IL).
Main Results:
- Achieved broadband operation with bandwidths of 160 nm, 95 nm, and 50 nm for ER > 20 dB, 30 dB, and 40 dB, respectively.
- Demonstrated low insertion loss (IL) < 1 dB over the 1.49-1.58 µm wavelength range.
- Analysis confirmed high fabrication tolerances for the proposed PBS design.
Conclusions:
- The proposed asymmetrical directional coupler-based PBS offers a promising solution for integrated photonic applications.
- The design achieves excellent broadband performance and low insertion loss.
- High fabrication tolerance makes the device suitable for practical manufacturing.
