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OPTICAL COMMUNICATION SYSTEM, OPTICAL TRANSMITTER, OPTICAL RECEIVER AND METHODS, AND CORRELATORS USED THEREFOR

外国特許コード F110003029
整理番号 P08-018US
掲載日 2011年5月13日
出願国 アメリカ合衆国
出願番号 98231110
公報番号 20110097079
公報番号 08559820
出願日 平成22年12月30日(2010.12.30)
公報発行日 平成23年4月28日(2011.4.28)
公報発行日 平成25年10月15日(2013.10.15)
優先権データ
  • 特願2008-174235 (2008.7.3) JP
発明の名称 (英語) OPTICAL COMMUNICATION SYSTEM, OPTICAL TRANSMITTER, OPTICAL RECEIVER AND METHODS, AND CORRELATORS USED THEREFOR
発明の概要(英語)

A complex orthogonal code in the present invention is one in which each row of a square matrix of N rows and N columns in which an element of an mth row and nth column is exp[2pij(m-1)(n-1)/N] (where j is an imaginary unit) is adopted as a code word. An optical orthogonal code for Optical Code Division Multiplexing/Optical Code Division Multiple Access (OCDM/OCDMA) is realized by a train of N-number of optical pulses corresponding to the argument (phase) of the code elements. An optical transmitter or optical receiver includes an optical correlator provided with a sampled Bragg grating having a plurality of Bragg gratings disposed serially at regular intervals inside an optical waveguide. The optical correlator is allocated any one of the code words. In the optical transmitter, an optical signal to be transmitted is encoded by the optical correlator.

In the receiver, a received optical signal is decoded by the optical correlator. A high autocorrelation output is obtained only in a case where the code word used to encode the received optical signal and the code word allocated to the optical receiver match.

  • 発明者/出願人(英語)
  • HANAWA MASANORI
  • UNIVERSITY OF YAMANASHI
  • HANAWA MASANORI
国際特許分類(IPC)
米国特許分類/主・副
  • 398/25
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