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Spectral tailoring of silicon grating-assisted contra-directional couplers
Optics Letters
|December 13, 2024
Summary
We developed a spectral tailoring methodology for grating-assisted, contra-directional couplers (GA-CDCs) to achieve complex spectral responses. This enables flexible design of silicon photonic devices for various optical filtering applications.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Grating-assisted, contra-directional couplers (GA-CDCs) offer advantages over traditional Bragg gratings due to their four-port operation.
- Flexible design of GA-CDCs' spectral responses remains a significant challenge in integrated photonics.
Purpose of the Study:
- To introduce a novel spectral tailoring methodology for GA-CDCs.
- To enable the achievement of arbitrary, physically realizable, complex spectral responses in GA-CDCs.
Main Methods:
- Development of a spectral tailoring methodology specifically for GA-CDCs.
- Fabrication and demonstration of silicon GA-CDCs utilizing the developed methodology.
Main Results:
- Demonstration of silicon GA-CDCs with customized spectral responses.
- Successful implementation of sidelobe-suppressed filters, single- and multi-channel flattop filters, and sawtooth- and triangle-shaped filters.
- Realization of three-channel photonic Hilbert transformers using the methodology.
Conclusions:
- The spectral tailoring methodology provides unprecedented flexibility in designing GA-CDC spectral responses.
- This work paves the way for advanced silicon photonic devices with tailored optical filtering characteristics.
