Abstract
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 language | English |
---|---|
Pages (from-to) | 16799-16814 |
Number of pages | 16 |
Journal | Optics Express |
Volume | 24 |
Issue number | 15 |
DOIs | |
Publication status | Published - 25 Jul 2016 |
Externally published | Yes |
Funding
This work was supported by the Andaluc?a Talent Hub Program launched by the Andalusian Knowledge Agency, co-funded by the European Union's Seventh Framework Program, Marie Curie actions (COFUND - Grant Agreement no 291780), the HOT project of Danish Innovation Fund, the Marie Curie FENDOI project, the Ministry of Economy, Innovation, Science and Employment of the Junta de Andaluc?a and the Brazilian agencies CAPES, CNPq, and FAPESP.