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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 19,
  • Issue 12,
  • pp. 1856-
  • (2001)

Optical Orthogonal Codes With Nonideal Cross Correlation

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Abstract

For optical code division multiple access (OCDMA) networks, many optical orthogonal codes (OOCs) with ideal auto-and cross-correlation properties had been studied widely. In this paper, we relax the cross-correlation constraint slightly and propose a new code family based on perfect difference codes. Given the same code weight and code length, the size of new codes may increase 10 times more than that of ideal OOCs. Although the maximum cross correlation of new codes is larger than one, the cross correlation is less than or equal to one, for the most part. Consequently, the performance of new codes approaches that of ideal OOCs. Numerical results show that the performance of proposed codes was almost the same as that of conventional OOCs under the same code length and code weight.

[IEEE ]

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