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Planar-type polarization beam splitter based on a bridged silicon waveguide coupler
Optics Express
|April 4, 2015
Summary
We developed a compact silicon nanowaveguide polarization beam splitter (PBS) with high extinction ratios over the C-band. This integrated photonic device offers excellent performance for optical communication applications.
Area of Science:
- Photonics
- Integrated Optics
- Nanotechnology
Background:
- Polarization beam splitters (PBS) are crucial components in optical systems.
- Existing PBS technologies face challenges in compactness and broadband performance.
Purpose of the Study:
- To design and fabricate a compact PBS with high polarization extinction ratios (PERs) across the C-band.
- To investigate the performance of a silicon nanowaveguide directional coupler for PBS applications.
Main Methods:
- Device design using three-dimensional finite-difference time-domain (3D-FDTD) simulations.
- Experimental fabrication of the silicon nanowaveguide PBS.
- Characterization of PER and insertion loss (IL) across the C-band.
Main Results:
- Achieved PERs greater than 20 dB over the full C-band.
- Measured PERs of 22.5 dB (TE) and 22.9 dB (TM) at 1550 nm.
- Insertion losses of 2.1 dB (TE) and 1.8 dB (TM) at 1550 nm.
Conclusions:
- The bridged silicon nanowaveguide directional coupler enables compact and high-performance PBS.
- The demonstrated PBS meets stringent requirements for broadband optical communication systems.
