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Broadband integrated polarization splitter and rotator using subwavelength grating claddings
Optics Express
|February 14, 2023
Summary
We developed a broadband photonic polarization splitter and rotator (PSR) using subwavelength gratings (SWGs). This device efficiently manages light polarization for integrated photonic circuits.
Area of Science:
- Photonics
- Integrated Optics
- Metamaterials
Background:
- Polarization management is crucial for photonic integrated circuits.
- Existing polarization splitters and rotators often lack broadband operation or efficiency.
Purpose of the Study:
- To design and demonstrate a broadband integrated photonic polarization splitter and rotator (PSR).
- To leverage subwavelength gratings (SWGs) for enhanced polarization manipulation.
Main Methods:
- Adiabatically tapered coupled waveguides with SWG claddings.
- Coupled-mode theory simulations.
- Full numerical simulations and experimental validation.
Main Results:
- Broadband operation from 1500-1750 nm (250 nm bandwidth).
- Extinction ratio > 20 dB, with experimental confirmation from 1490-1590 nm.
- Insertion losses < 1.3 dB.
Conclusions:
- SWGs act as anisotropic metamaterials, enabling efficient and broadband modal conversion.
- The adiabatic design ensures tolerance to fabrication variations.
- The proposed PSR is broadly applicable for polarization management in photonic integrated circuits.
