Passive and active optical bit-pattern recognition structures for multiwavelength optical packet switching networks

Abstract

Next generation High-Speed optical packet switching networks require components capable of recognising the optical header to enable onthe-fly accurate switching of incoming data packets to their destinations. This paper experimentally demonstrates a comparison between two different optical header recognition structures; A passive structure based on the use of Fiber Bragg Gratings (FBGs), whereas the active structure employs Opto-VLSI processors that synthesise dynamic wavelength profile through digital phase holograms. The structures are experimentally demonstrated at 10Gbps. Performance comparison between the two structures is also discussed. These optical header recognition structures are attractive for multiwavelength optical network and applications.

Increase of Recognizable Label Number with Optical Passive Waveguide Circuits for Recognition of Encoded 4- and 8-Bit BPSK Labels

“…Binary phase-shift-keying (BPSK) codes are one of the basic formats for the optical labels as well as for optical payload. Optical correlator-based systems have been investigated to recognize matched labels, which include systems consisting of fiber Bragg grating [3], taps and delay lines [2], and combination of a grating and spatial filters [4]- [6]. Multiple labels that correspond to a partial set of binary codes have also been recognized with waveguide-type circuits consisting of arrayed waveguide gratings (AWGs) [7], [8] and cascaded interferometers [9], [10].…”

All‐optical multi‐wavelength header recognition using superimposed Bragg gratings based correlators

“…Employing this method enables the node to easily differentiate the header from the payload and extract it from the packet and also processes the header quickly and efficiently. Several schemes for multi‐wavelength header recognition have previously been proposed, which are based on fiber Bragg gratings (FBGs) , opto‐VLSI processor and dual arrayed waveguide gratings (AWG) . The use of multi‐wavelength header transmission offers many advantages over other transmission methods, including simpler signal processing, less demanding synchronization control requirements, and easier implementation in high‐speed optical systems .…”