A programmable 8-bit optical correlator filter for optical bit pattern recognition

Mahmoud S. Rasras, Inuk Kang, Mihaela Dinu, James Jaques, Niloy Dutta, Alfonso Piccirilli, Mark A. Cappuzzo, Evans Y. Chen, Louis T. Gomez, Annjoe Wong-Foy, Steve Cabot, Gregory S. Johnson, Larry Buhl, Sanjay S. Patel

Research output: Contribution to journalArticlepeer-review


We demonstrate a compact reconfigurable 8-bit optical matching filter fabricated using 4% delta high-index-contrast silica-on-silicon waveguides. This planar lightwave circuit is based on an eighth-order tap-and-delay finite impulse response architecture. Multimode interference-based splitters/combiners along with variable optical attenuators and phase shifters allow us to tune and dynamically reconfigure all the taps and delays (filter coefficients) in the filter using a simple automated algorithm. The filter is designed to recognize 8-bit patterns in 40-Gb/s data streams and we demonstrate its working principle by successfully correlating 8-bit binary phase-shift-keyed patterns.

Original languageEnglish (US)
Pages (from-to)694-696
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number9
StatePublished - May 1 2008


  • High-index-contrast waveguide
  • Matched filter
  • Optical communications
  • Optical correlator
  • Routing
  • Transversal filter

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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