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Realization of asymmetric optical filters using asynchronous coupled-microring resonators
Optics Express
|June 24, 2009
Summary
New microring resonator filters offer asymmetric spectral responses for advanced optical applications. This design allows separate optimization of filter transition bands, enabling complex spectral shaping and dispersion engineering.
Area of Science:
- Photonics and Optical Engineering
- Microwave and Optical Engineering
Background:
- Traditional optical filters often use symmetric spectral responses, limiting their applicability in complex optical systems.
- Advanced optical applications require filters with more sophisticated spectral shapes than symmetric designs can provide.
Purpose of the Study:
- To propose general filter architectures using coupled-microring resonators for asymmetric spectral responses.
- To present a method for synthesizing these asymmetric responses for improved optical filtering.
Main Methods:
- Utilizing asynchronously-tuned, coupled-microring resonators.
- Adjusting transmission zeros of the filter transfer function for independent optimization of transition bands.
- Employing an energy coupling matrix for synthesizing asymmetric spectral responses.
Main Results:
- Demonstrated microring resonator architectures capable of realizing asymmetric optical filters.
- Numerical examples of high-order asymmetric optical filters were presented.
- Showcased the ability to separately optimize low and high-frequency transition bands.
Conclusions:
- Asymmetric filters based on coupled-microring resonators offer enhanced capabilities for optical spectral shaping.
- These novel architectures are suitable for advanced applications in optical communications and signal processing.
- The proposed synthesis method provides a pathway for designing complex optical filters.
