Abstract
This paper analyzes the performance of subcarrier multiplexing (SCM) of spectral amplitude coding optical code multiple access (SAC-OCDMA) by applying Recursive Combinatorial (RC) code based on single photodiode detection (SPD). SPD is used in the receiver part to reduce the effect of multiple access interference (MAI) which contributes as a dominant noise in incoherent SAC-OCDMA systems. Results indicate that the SCM OCDMA network performance could be improved by using lower data rates and higher number of weight. Total number of users can also be enhanced by adding lower data rates and higher number of subcarriers.
Highlights
Researchers have shown an increased interest in optical code division multiple access (OCDMA)
The major drawback of OCDMA is, the performance of the system degrades owing to the effects of multiple access interference (MAI) [3]
The rest of the paper is organized as follows: In Section 2, we introduce system design based on single photodiode detection (SPD) detection technique
Summary
Researchers have shown an increased interest in optical code division multiple access (OCDMA). OCDMA is an optical-based multiple-access method which can transmit the data simultaneously from several users over the network and can be distinguished by its signature of the code based on specific detection. Thereby, Spectral amplitude coding (SAC) approaches have been proposed It is a flexible implementation of optical access networks for long-haul transmission. Subcarrier multiplexing (SCM) technique has become increasing demand in OCDMA system since it gives the independency of different channels [6] This allows for great flexibility in the choice of modulation schemes. The output is either code weight power unit for active user or zero power units for interferers This implies that the interference signals are suppressed in the optical domain before the conversion of the signals to the electrical domain, as a result, the proposed SPD scheme alleviates both PIIN and MAI in the optical domain. The original data signal is detected at the output of LPF using a BER analyser
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