A Programmable 8-bit Optical Correlator Filter for Optical Bit Pattern Recognition

Author

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

Author_Institution

Bell Labs., Murray Hill

Volume

20

Issue

9

fYear

2008

fDate

5/1/2008 12:00:00 AM

Firstpage

694

Lastpage

696

Abstract

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.

Keywords

FIR filters; optical attenuators; optical correlation; optical filters; optical waveguides; pattern recognition; programmable filters; bit rate 40 Gbit/s; delta high-index-contrast silica-on-silicon waveguides; eighth-order tap-and-delay finite impulse response architecture; high-index contrast waveguide; matched filter; multimode interference-based combiners; multimode interference-based splitters; optical bit pattern recognition; optical communications; phase shifters; planar lightwave circuit; programmable optical correlator filter; reconfigurable optical matching filter; transversal filter; variable optical attenuators; word length 8 bit; Circuits; Correlators; Finite impulse response filter; Interference; Matched filters; Optical attenuators; Optical filters; Optical waveguides; Pattern recognition; Phase shifters; High-index-contrast waveguide; matched filter; optical communications; optical correlator; routing; transversal filter;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2008.920034

Filename

4479623