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Nyquist wavelength division (de)multiplexing (N-WDM) is a highly promisingtechnique for next-generation high-speed elastic networks. In N-WDM, Nyquistfiltering is an essential function that governs the channel spectralefficiency. However, most Nyquist filter implementations to date require eitherexpensive, power-hungry digital electronics or complex arrangements of bulkyoptical components, hindering their adoption for important functions such asNyquist channel shaping and reconfigurable optical add-drop multiplexers(ROADMs) for Nyquist super-channels. Here, we present a distinctive solutionwith low-cost, power-efficient, and simple-device natures, which is an on-chipoptical Nyquist-filtering (de)interleaver featuring sub-GHz resolution and anear-rectangular passband with 8% transition band. This unprecedentedperformance is provided by a simple photonic integrated circuit comprising atwo-ring-resonator-assisted Mach-Zehnder interferometer, which features highcircuit compactness using high-index-contrast Si3N4 waveguide, while showingsub-picosecond optical delay accuracy enabling full C-band coverage with morethan 160 effective free spectral ranges of 25 GHz across a bandwidth over 4THz. Such devices show clear potential for chip-scale realization of N-WDMtransceivers and ROADMs.

Full-C-band, sub-GHz-resolution Nyquist-filtering (de)interleaver in photonic integrated circuit