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Polarization rotator based on augmented low-index-guiding waveguide on silicon nitride/silicon-on-insulator platform
Optics Letters
|July 16, 2016
Summary
Researchers developed a compact polarization rotator using a novel silicon nitride/silicon dual-core waveguide. This device efficiently converts transverse electric (TE) to transverse magnetic (TM) light and vice versa, achieving high conversion efficiencies.
Area of Science:
- Photonics and Optical Engineering
- Materials Science for Optoelectronics
Background:
- Polarization control is crucial for optical communication systems.
- Compact and efficient polarization rotators are needed for integrated photonic circuits.
Purpose of the Study:
- To design, fabricate, and characterize a compact polarization rotator.
- To achieve efficient transverse electric (TE) to transverse magnetic (TM) and TM-to-TE polarization conversion.
Main Methods:
- Utilized a newly proposed augmented low-index-guiding scheme.
- Employed a silicon nitride/silicon dual-core waveguide structure.
- Implemented an asymmetric directional coupler for polarization rotation.
Main Results:
- Achieved peak conversion efficiencies of approximately 97% for both TE-to-TM and TM-to-TE rotations.
- Demonstrated polarization extinction ratios greater than 20 dB (TE-to-TM) and 15 dB (TM-to-TE) over significant bandwidths (50 nm and C-band, respectively).
Conclusions:
- The designed dual-core waveguide polarization rotator is highly efficient and compact.
- The device exhibits excellent performance over broad wavelength ranges, suitable for optical communications.
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