Improved probability density function using modified-AND detection technique for incoherent SAC-OCDMA systems

The rapid progress in video-based Internet applications is increasing the demand for efficient optical communication systems. In this paper, developed detection technique for incoherent spectral-amplitude coding optical code-division multiple-access (SAC-OCDMA) systems is presented. In order to tighten the correspondence between practical and theoretical results, the most dominant noises that might influence the performance of the SAC-OCDMA systems such as intensity, shot, and thermal noises are considered. The probability density function (PDF) and signal-to-noise ratio (SNR) of modified quadratic congruence (MQC) code are evaluated and compared according to the results obtained. The numerical results confirm that the proposed system using modified-AND subtraction detection can substantially accommodate a lot of users with enhanced PDF and higher SNR.