Reconfigurable radiofrequency filters based on versatile soliton microcombs

Hu, Jianqi; He, Jijun; Liu, Junqiu; Raja, Arslan S.; Karpov, Maxim; Kippenberg, Tobias J.; Brès, Camille‐Sophie

doi:10.1038/s41467-020-18215-z

“…Even without this, however, using the discrete integrated comb sources to replace discrete laser arrays already yields significant benefits for RF and microwave systems in terms of performance, size, cost, and complexity. Finally, soliton crystals have recently [203][204][205][206][207][208][209][210][211][212][213][214][215] been shown to be able to achieve a range of RF functions without the need for any spectral shaping -only by triggering the different soliton states through different pumping conditions which yields different spectra. This adds an entirely new dimension to microcombs beyond what is possible with DKS states.…”

Section: Discussionmentioning

confidence: 99%

Photonic RF and microwave fractional differentiation, integration, and Hilbert transforms with Kerr optical micro-combs

Tan

¹

,

Xu

²

,

Moss

³

2021

Preprint

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Integrated Kerr micro-combs are a powerful source of multiple wavelength channels for photonic radio frequency (RF) and microwave signal processing, particularly for transversal filter systems. They offer significant advantages featuring a compact device footprint, high versatility, large numbers of wavelengths, and wide Nyquist bands. We present our recent progress on photonic RF and microwave high bandwidth temporal signal processing based on Kerr micro-combs with comb spacings from 49GHz to 200GHz. We focus on integral and fractional Hilbert transforms, differentiators as well as integrators. The future potential of optical micro-combs for RF photonic applications in terms of functionality and ability to realize integrated solutions is also discussed.

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“…Even without this, however, using the discrete integrated comb sources to replace discrete laser arrays already yields significant benefits for RF and microwave systems in terms of performance, size, cost, and complexity. Finally, soliton crystals have recently [202][203][204][205] been shown to be able to achieve a range of RF functions without the need for any spectral shapingonly by triggering the different soliton states through different pumping conditions which yields different spectra. This could potentially extend to the mid IR region as well [206][207][208][209][210] since these systems are not fundamentally restricted to operating in the telecom band.…”

Section: Discussionmentioning

confidence: 99%

Photonic RF and microwave temporal signal processing based on optical Kerr micro-combs

Moss¹

2021

Preprint

0

View full text Add to dashboard Cite

Integrated Kerr micro-combs are a powerful source of multiple wavelength channels for photonic radio frequency (RF) and microwave signal processing, particularly for transversal filter systems. They offer significant advantages featuring a compact device footprint, high versatility, large numbers of wavelengths, and wide Nyquist bands. We review progress photonic RF and microwave high bandwidth temporal signal processing based on Kerr micro-combs with comb spacings from 49GHz to 200GHz. We focus on integral and fractional Hilbert transforms, differentiators as well as integrators. The future potential of optical micro-combs for RF photonic applications in terms of functionality and ability to realize integrated solutions is also discussed.

show abstract

“…Even without this, however, using the discrete integrated comb sources to replace discrete laser arrays already yields significant benefits for RF and microwave systems in terms of performance, size, cost, and complexity. Finally, soliton crystals have recently [203][204][205][206][207][208][209][210][211][212][213][214][215] been shown to be able to achieve a range of RF functions without the need for any spectral shaping -only by triggering the different soliton states through different pumping conditions which yields different spectra. This adds an entirely new dimension to microcombs beyond what is possible with DKS states.…”

Section: Discussionmentioning

confidence: 99%

Photonic RF and Microwave Fractional Differentiation, Integration, and Hilbert Transforms With Kerr Optical Micro-Combs

Tan

¹

,

Xu

²

,

Moss

³

2021

SSRN Journal

0

View full text Add to dashboard Cite

Integrated Kerr micro-combs are a powerful source of multiple wavelength channels for photonic radio frequency (RF) and microwave signal processing, particularly for transversal filter systems. They offer significant advantages featuring a compact device footprint, high versatility, large numbers of wavelengths, and wide Nyquist bands. We present our recent progress on photonic RF and microwave high bandwidth temporal signal processing based on Kerr micro-combs with comb spacings from 49GHz to 200GHz. We focus on integral and fractional Hilbert transforms, differentiators as well as integrators. The future potential of optical micro-combs for RF photonic applications in terms of functionality and ability to realize integrated solutions is also discussed. Keywords-Microwave photonics, micro-ring resonators, signal processing, microcombs, Kerr combs. integrated micro-combs typically have much wider spacings from 10's to 100's of GHz and even into the THz regime. Larger comb spacings yield much wider Nyquist zones that are needed to achieve large RF bandwidths, whereas finer spacings provide much larger numbers of wavelengths or RF "taps", but at the cost of a much smaller Nyquist zone, or RF bandwidth. Micro-combs can provide higher numbers of wavelengths together with still being able to provide a large FSR, in a compact footprint. For RF transversal filters the number of taps, or wavelengths, dictates the available number of channels for, for example, RF true time delays as well as determining the performance of RF filters [85,121]. Other systems such as beamforming devices [112] can also be greatly improved in terms of their quality factor and angular resolution. Other innovative approaches to filtering include techniques such as RF bandwidth scaling [125] that provide a certain bandwidth for each wavelength channel, and so the total operation bandwidth (maximum RF signal bandwidth that can be processed) will depend on the number of wavelengths, and will therefore be significantly enhanced by the use of micro-combs.Recently [121], we reported transversal filtering and bandwidth scaling methods based on Kerr micro-combs applied to RF and microwave spectral filters. In this paper, we present our recent work on RF and microwave high bandwidth temporal signal processing based on integrated Kerr micro-comb devices. We achieve both integral and fractional order Hilbert transformers and differentiators, as well as RF integrators. We discuss the trade-offs involved between using wide spaced micro-combs with an FSR of 200GHz [109][110][111] with recently reported record low FSR spaced micro-combs at 49 GHz, based on soliton crystals [122][123][124][125][126][127][128]. We highlight their potential and future possibilities, contrasting the different methods and use of the differently spaced micro-combs. While 200GHz Kerr micro-combs have proven to be a powerful source for RF transversal filters, enabling high versatility as well as dynamic reconfigurability, the relatively large comb spacing FSR of ~1.6 nm restricts the n...

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Reconfigurable radiofrequency filters based on versatile soliton microcombs

Cited by 59 publications

References 49 publications

Photonic RF and microwave fractional differentiation, integration, and Hilbert transforms with Kerr optical micro-combs

Photonic RF and microwave fractional differentiation, integration, and Hilbert transforms with Kerr optical micro-combs

Photonic RF and microwave temporal signal processing based on optical Kerr micro-combs

Photonic RF and Microwave Fractional Differentiation, Integration, and Hilbert Transforms With Kerr Optical Micro-Combs

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