Discrimination of All Types of 4-Bit Optical Code by Optical Time-Gating and Designed Label Recognition Filter in Label Recognition Using Optical Correlation

Tsuyoshi KONISHI
Kazuyoshi ITOH
Naoya WADA

IEICE TRANSACTIONS on Communications   Vol.E88-B    No.10    pp.3841-3847
Publication Date: 2005/10/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.10.3841
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Next Generation Photonic Network Technologies)
optical label recognition,  optical correlation,  optical time-gating,  2-adamantylamino-5-nitropyridine (AANP),  

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In label recognition based on optical correlation processing, to completely discriminate a 4-bit target optical code from all types of 4-bit nontarget ones, we propose a novel label recognition method using both optical time-gating and the designed label recognition filter. We experimentally demonstrate that the intensities of correlation signals of 4-bit similar optical codes can be suppressed by the designed label recognition filter and that only the correlation signal of a 4-bit target optical code can be detected by extraction with optical time-gating. The optical time-gating is realized by using organic nonlinear optical crystal: 2-adamantylamino-5-nitropyridine (AANP).