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Code-division multiple-access techniques in optical fiber networks - Part III: Optical and logic gate receiver structure with generalized optical orthogonal codes

Mashhadi, S ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2006.878835
  3. Publisher: 2006
  4. Abstract:
  5. In this paper, we present a deep insight into the behavior of optical code-division multiple-access (OCDMA) systems based on an incoherent, intensity encoding/decoding technique using a well-known class of codes, namely, optical orthogonal codes (OOCs). As opposed to parts I and II of this paper, where OOCs with cross-correlation λ = 1 were considered, we consider generalized OOCs with 1 ≤ λ ≤ w, where w is the weight of the corresponding codes. To enhance the performance of such systems, we propose the use of an optical and logic gate receiver, which, in an ideal case, e.g., in the absence of any noise source, except the optical multiple-access interference, is optimum. Using some basic laws on probability, we present direct and exact solutions for OOCs with λ = 1,2,3,...,w, with the optical and logic gate as receiver. Using the exact solution, we obtain empirical solutions that can be easily used in optimizing the design criteria of such systems. From our optimization scheme, we obtain some fresh insight into the performance of OOCs with λ ≤ 1. In particular, we can obtain some simple relations between Pemin (minimum error rate), Lmin (minimum required OOC length), and Nmax (maximum number of interfering users to be supported), which are the most desired parameters for any OCDMA system design. Furthermore, we show that in most practical cases, OOCs with λ = 2, 3 perform better than OOCs with λ = 1, while having a much bigger cardinality. Finally, we show that an upper bound on the maximum weight of OOCs are on the order of √2λL where L is the length of the OOCs. © 2006 IEEE
  6. Keywords:
  7. Codes (symbols) ; Fiber optic networks ; Logic gates ; Optimization ; Probability ; Signal receivers ; Logic gate receiver structure ; Optical code-division multiple-access ; Optical orthogonal codes ; Optical receiver structure ; Optimum weight ; Code division multiple access
  8. Source: IEEE Transactions on Communications ; Volume 54, Issue 8 , 2006 , Pages 1457-1468 ; 00906778 (ISSN)
  9. URL: https://ieeexplore.ieee.org/document/1673678