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Reconfigurable radiofrequency filters based on versatile soliton microcombs
Jianqi Hu1, Jijun He2, Junqiu Liu2
1École Polytechnique Fédérale de Lausanne, Photonic Systems Laboratory (PHOSL), STI-IEL, Station 11, 1015, Lausanne, Switzerland.
Nature Communications
|September 3, 2020
Summary
Researchers developed novel microcomb-based radiofrequency filters without complex pulse shapers. These filters are all-optically reconfigurable, simplifying microwave photonics systems.
Area of Science:
- Photonics
- Optical Engineering
- Applied Physics
Background:
- Integrated Kerr microcombs are promising for microwave photonics.
- Current microcomb radiofrequency filters require costly and complex pulse shapers.
Purpose of the Study:
- To demonstrate microcomb-based radiofrequency filters without additional pulse shaping.
- To achieve all-optical reconfiguration of these filters.
Main Methods:
- Leveraging the smooth spectral envelope of single solitons.
- Utilizing perfect soliton crystals to multiply comb spacing.
- Exploiting spectral interference patterns of two solitons for reconfigurability.
Main Results:
- Demonstrated microcomb-based radiofrequency filters free from pulse shapers.
- Achieved all-optical reconfiguration of filter passband frequencies.
- Proposed schemes eliminate the need for interferometric setups or external pulse shapers.
Conclusions:
- Simplified synthesis of widely reconfigurable microcomb-based radiofrequency filters.
- Potential for cost-effective and compact microwave photonic systems.
- Advances in optical signal processing and filter design.
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