Hybrid optical CDMA-FSO communications network under spatially correlated gamma-gamma scintillation

Antonio Jurado-Navas, Thiago R. Raddo, José María Garrido-Balsells, Ben Hur V. Borges, Juan José Vegas Olmos, Idelfonso Tafur Monroy

Research output: Contribution to journalArticleAcademicpeer-review

33 Citations (Scopus)
34 Downloads (Pure)


In this paper, we propose a new hybrid network solution based on asynchronous optical code-division multiple-access (OCDMA) and free-space optical (FSO) technologies for last-mile access networks, where fiber deployment is impractical. The architecture of the proposed hybrid OCDMA-FSO network is thoroughly described. The users access the network in a fully asynchronous manner by means of assigned fast frequency hopping (FFH)-based codes. In the FSO receiver, an equal gain-combining technique is employed along with intensity modulation and direct detection. New analytical formalisms for evaluating the average bit error rate (ABER) performance are also proposed. These formalisms, based on the spatially correlated gamma-gamma statistical model, are derived considering three distinct scenarios, namely, uncorrelated, totally correlated, and partially correlated channels. Numerical results show that users can successfully achieve error-free ABER levels for the three scenarios considered as long as forward error correction (FEC) algorithms are employed. Therefore, OCDMA-FSO networks can be a prospective alternative to deliver high-speed communication services to access networks with deficient fiber infrastructure.

Original languageEnglish
Pages (from-to)16799-16814
Number of pages16
JournalOptics Express
Issue number15
Publication statusPublished - 25 Jul 2016
Externally publishedYes


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