Sub-GHz-resolution C-band Nyquist-filtering interleaver on a high-index-contrast photonic integrated circuit

Leimeng Zhuang, Chen Zhu, Bill Corcoran, Maurizio Burla, Chris G. H. Roeloffzen, Arne Leinse, Jochen Schröder, Arthur J. Lowery
<span title="2016-03-07">2016</span> <i title="The Optical Society"> <a target="_blank" rel="noopener" href="" style="color: black;">Optics Express</a> </i> &nbsp;
Modern optical communications rely on high-resolution, highbandwidth filtering to maximize the data-carrying capacity of fiber-optic networks. Such filtering typically requires high-speed, power-hungry digital processes in the electrical domain. Passive optical filters currently provide high bandwidths with low power consumption, but at the expense of resolution. Here, we present a passive filter chip that functions as an optical Nyquist-filtering interleaver featuring sub-GHz resolution and a
more &raquo; ... earrectangular passband with 8% roll-off. This performance is highly promising for high-spectral-efficiency Nyquist wavelength division multiplexed (N-WDM) optical super-channels. The chip provides a simple two-ring-resonator-assisted Mach-Zehnder interferometer, which has a subcm 2 footprint owing to the high-index-contrast Si 3 N 4 /SiO 2 waveguide, while manifests low wavelength-dependency enabling C-band (> 4 THz) coverage with more than 160 effective free spectral ranges of 25 GHz. This device is anticipated to be a critical building block for spectrally-efficient, chip-scale transceivers and ROADMs for N-WDM super-channels in next-generation optical communication networks.
<span class="external-identifiers"> <a target="_blank" rel="external noopener noreferrer" href="">doi:10.1364/oe.24.005715</a> <a target="_blank" rel="external noopener" href="">pmid:27136769</a> <a target="_blank" rel="external noopener" href="">fatcat:ez2fypksd5eftl36o4d2naumxa</a> </span>
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