Reconfigurable radiofrequency filters based on versatile soliton microcombs

Abstract

The rapidly maturing integrated Kerr microcombs show significant potential for microwave photonics. Yet, state-of-the-art microcomb based radiofrequency (RF) filters have required programmable pulse shapers, which inevitably increase the system cost, footprint, and complexity. Here, by leveraging the smooth spectral envelope of single solitons, we demonstrate for the first time microcomb based RF filters free from any additional pulse shaping. More importantly, we achieve all-optical reconfiguration of the RF filters by exploiting the intrinsically rich soliton configurations. Specifically, we harness the perfect soliton crystals to multiply the comb spacing thereby dividing the filter passband frequencies. Also, a completely novel approach based on the versatile interference patterns of two solitons within one round-trip, enables wide reconfigurability of RF passband frequencies according to their relative azimuthal angles. The proposed schemes demand neither an interferometric setup nor another pulse shaper for filter reconfiguration, providing a practical route towards chip-scale, widely reconfigurable microcomb based RF filters.

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Cited by in corpus (9)

• Bridging microcombs and silicon photonic engines for optoelectronics systems
• High bandwidth temporal RF photonic signal processing with Kerr micro-combs: integration, fractional differentiation and Hilbert transforms
• Applications of integrated optical microcombs
• Designing and analyzing microwave photonic spectral domain filters based on transversal filtering with optical microcombs
• Optical Frequency Combs in Aqueous and Air Environments at Visible to Near-IR Wavelengths
• Programmable access to microresonator solitons with modulational sideband heating
• Microwave photonic transversal filters based on microcombs with feedback control
• Contrasting the relative performance of RF photonic transversal signal processors based on microcombs using discrete components versus integrated devices
• Deterministic generation of a perfect soliton crystal with a saturable absorber