Abstract
We have proposed a label recognition integrated-optic circuits for
photonic label switching using self-routing of the label pulses. Binary
phase shift keying (BPSK) format is considered as the label. An identifying
bit is placed ahead of the address bits in the label. The label recognition
system consists of a tree-structure connection of asymmetric X-junction
couplers. The system uses self-routing propagation of the identification bit
controlled by the address bits. Asymmetric X-junction couplers have a
feature of small dependence on wavelength. However, the wavelength
dependence of optical circuits consisting of multiple asymmetric X-junction
couplers depends strongly on its architecture. In this paper, we propose a
wavelength insensitive architecture of the recognition circuit. The
wavelength independence in the improved circuit is confirmed using
finite-difference beam propagation method (FD-BPM). We numerically
demonstrate that our proposed system can recognize all the binary-code
labels in wavelength range of 1500–1600 nm with crosstalk less
than ${-}25$ dB and ${-}15$ dB for label length three and four, respectively.
© 2009 IEEE
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