Abstract
Fast all-optical processing is expected for packet routing in high-speed
photonic networks. In photonic label networks, recognition of optical labels
is one of the key functions. We propose a scalable passive waveguide device
to recognize binary phase shift keying (BPSK) labels. The label recognition
device consists of cascaded asymmetric X-junction couplers. The proposed basic
device recognizes four labels consisting of parallel four pulses. Since an
output is obtained at only one output port out of four ports with high contrast
ratio, the device can be scaled up for labels of a larger number of bits.
The devices for four, eight and sixteen labels are theoretically analyzed.
To confirm the operation in the devices, the label recognition of four- and
eight-bit labels is numerically simulated by finite-difference beam propagation
method (FD-BPM). Expanded circuits based on the four-bit basic device to increase
the number of recognizable labels are also presented.
© 2011 IEEE
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