Selectable-FSR 10-GHz Granularity WDM Superchannel Filter in a Reconfigurable Photonic Integrated Circuit

Yiwei Xie, Zihan Geng, Deming Kong, Leimeng Zhuang, Arthur J. Lowery

Research output: Contribution to journalArticleResearchpeer-review

12 Citations (Scopus)


We present a 10-GHz granularity reconfigurable WDM superchannel filter in a photonic integrated circuit. The filter uses a ring-resonator-assisted tapped-delay-line topology. An example configuration with two ring resonators and four tapped delay lines provides a spectral filter with a flat-top passband, a roll-off factor of 8%, a tunable central wavelength, and a selectable free spectral range, i.e. 2° or 4° the 3-dB passband bandwidth. The device was fabricated in a silicon nitride (Si3N4/SiO2) waveguide with a chip area of 0.36 cm2 and has a fiber-to-fiber insertion loss of 5 dB. We experimentally demonstrate the filter for selecting a subchannel from a WDM superchannel comprising 10-GHz subchannels with 10% and zero guard bands. Owing to the infinite impulse responses of ring resonators, this filter requires a significantly smaller area and fewer tuning elements compared with designs based on only tapped-delay-line finite-impulse-response filters. This work contributes to the creation of chip-scale all-optical WDM superchannel transceivers and reconfigurable optical add/drop multiplexers (ROADMs).

Original languageEnglish
Pages (from-to)2619-2626
Number of pages8
JournalJournal of Lightwave Technology
Issue number13
Publication statusPublished - 13 Jul 2018


  • fast Fourier transform
  • fiber communications
  • Nyquist filter
  • optical signal processing
  • photonic integrated circuit
  • transceiver
  • waveguide device
  • WDM

Cite this