Optical Label Recognition Using Tree-Structure Self-Routing Circuits Consisting of Asymmetric X-Junctions

Hitoshi HIURA  Jouji NARITA  Nobuo GOTO  

IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.12   pp.2270-2277
Publication Date: 2007/12/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.12.2270
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optoelectronics
photonic packet switching,  self-routing,  label recognition,  integrated optics,  asymmetric X-junction,  

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We propose a new label recognition system for photonic label routing network. Binary-coded labels in binary phase-shift-keying format are considered. The system consists of an optical waveguide circuit with tree-structure passive asymmetric X-junctions and time gates. The system uses self-routing propagation of an identifying bit by performing interference with address bits. The identifying bit is placed in advance of the address bits in the label. The identifying bit pulse is routed to the destination output port corresponding to the code of the address. The operation principle is described. It is shown that all the binary number codes can be recognized with this system. We discuss the feasibility of the system by evaluating its crosstalk. To reduce the crosstalk, an improved scheme is also presented. The label recognition operation with the optical waveguide device is verified by numerical simulation using the finite-difference beam propagation method.