Abstract
In photonic label routing networks, optical recognition of optical labels
is one of the key functions. We propose a passive waveguide-type device for
recognition of optical coded labels. We consider quadrature-phase-shift-keying
(QPSK) coded labels. The basic module of the proposed device consists of a
3-dB directional coupler, two Y-junctions, and an asymmetric X-junction. By
using interference between an optical pulse of each coded bit and a identifying
bit pulse, the basic module distinguishes optical phase of the QPSK signal
in a self-routing fashion of the identifying bit pulse. QPSK codes consisting
of plural bits can also be recognized by connecting the basic module devices
in a tree structure through a phase adjustment circuit. The performance of
the proposed basic module is confirmed by simulation using beam propagation
method (BPM).
© 2009 IEEE
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