Synchronous optical cdma networks capacity increase using transposed modified prime codes

M. Massoud Karbassian, Franko Kueppers

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


A novel spreading code-set based on the prime code (PC) families, referred to as transposed modified prime codes (T-MPC), is proposed for synchronous optical code-division multiple-access (OCDMA) networks. The new code-set is constructed algorithmically to enhance and simplify its implementation. The proposed code-set performance is compared with existing spreading code families in terms of correlations, bit-error rate (BER) and cardinality. The proposed optical spreading code family doubles the cardinality as compared to existing PC families. This also implies that greater number of users can be accommodated in the network. Since there is no longer a time-shift feature in T-MPC like in conventional modified prime codes (MPC), the code is not predictable and thus even more secure. However, the code structure is similar to MPC, thus its employment in a system running MPC will be nondestructive. The code is also compatible with low-weight MPC. The results indicate that the proposed code-set has properties to enhance the OCDMA network capacity remarkably.

Original languageEnglish
Article number5504023
Pages (from-to)2603-2610
Number of pages8
JournalJournal of Lightwave Technology
Issue number17
Publication statusPublished - 2010
Externally publishedYes


  • Multiple-user interference
  • Optical CDMA
  • Optical coding
  • Prime codes
  • Spreading code design


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