Photonic RF spectral filters based on transversal filters with Kerr
microcombs of varying free spectral ranges
Abstract
Integrated Kerr microcombs are emerging as a powerful tool as
sources of multiple wavelength channels for photonic RF and microwave
signal processing mainly in the context of transversal filters. They
offer a compact device footprint, very high versatility, large numbers
of wavelengths, and wide Nyquist bands. Here, we review recent progress
on Kerr microcomb-based photonic RF and microwave reconfigurable
filters, based both on transversal filter methods and on RF to optical
bandwidth scaling. We compare and contrast results achieved with wide
comb spacing combs (200GHz) with more finely spaced (49GHz) microcombs.
The strong potential of optical micro-combs for RF photonics
applications in terms of functions and integrability is also discussed.
Index Terms—Microwave photonics, micro-ring
resonators.
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