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Efficient silicon polarization rotator based on mode-hybridization in a double-stair waveguide
Optics Express
|April 4, 2015
Summary
We developed a compact silicon polarization rotator using a novel double-stair waveguide. This device achieves high polarization extinction ratios, crucial for silicon photonics applications.
Area of Science:
- Photonics
- Materials Science
- Electrical Engineering
Background:
- Silicon photonics demands efficient polarization control components.
- Existing polarization rotators can be complex or require non-standard fabrication.
Purpose of the Study:
- To present a compact silicon polarization rotator (PR) utilizing mode-hybridization.
- To demonstrate fabrication compatibility with standard silicon photonics processes.
Main Methods:
- Mode-hybridization achieved by breaking waveguide symmetry in a double-stair design.
- Finite-difference time-domain (FDTD) simulations to optimize waveguide dimensions.
- Experimental characterization of fabricated devices.
Main Results:
- A 23-μm-long silicon polarization rotator was fabricated.
- A polarization extinction ratio (PER) exceeding 17 dB was achieved across 1500-1540 nm.
- A maximum PER of over 30 dB was observed at 1518 nm.
Conclusions:
- The proposed double-stair waveguide enables compact and efficient silicon polarization rotators.
- The device is compatible with existing silicon photonics manufacturing.
- This technology offers a promising solution for polarization management in integrated photonic circuits.
