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Reconfigurable integrated photonic filters for optical signal processing using a silicon photonic platform
Optics Letters
|March 1, 2024
Summary
This study introduces a novel photonic filter design using pole-zero optimization for precise optical filter responses. The silicon photonic filter demonstrates reconfigurable transmission tunability and sharp out-of-band rejection.
Area of Science:
- Photonics
- Optical Engineering
- Filter Design
Background:
- Photonic filters are crucial components in optical communication and signal processing systems.
- Existing design methods can be complex and lack reconfigurability.
Purpose of the Study:
- To present a systematic photonic filter design approach using pole-zero optimization.
- To demonstrate a reconfigurable photonic filter with tunable transmission on a silicon photonic platform.
Main Methods:
- Deriving filter transfer functions from specifications via closed-form optimization.
- Translating optical design parameters using pole-zero optimization.
- Fabricating a compact, reconfigurable three-pole photonic filter using micro-ring resonators and thermal phase shifters.
Main Results:
- Successful design and validation of Chebyshev and elliptic photonic filters.
- Demonstration of transmission tunability in a fabricated silicon photonic filter.
- Achieved sharp out-of-band edge rejection of at least 20 dB (elliptic) and 40 dB (Chebyshev).
Conclusions:
- The proposed pole-zero optimization method provides a systematic approach for photonic filter design.
- Integrated thermal phase shifters enable effective reconfiguration of photonic filter responses.
- The demonstrated silicon photonic filter offers high performance and tunability for optical applications.
