Performance analysis of code division multiple access techniques in fiber optics with on-off and PPM pulsed signaling

The performance of asynchronous code division multiple access (CDMA) fiber optics using noncoherent optical-signal processing is analyzed. The use of pseudo-orthogonal address codes with aperiodic and periodic correlation properties is explored for on-off and pulse position modulation (PPM). The performance of the schemes is analyzed using avalanche photodiodes (APD) in both signaling and address code formats. The bit error rate is evaluated in terms of system parameters, such as number of active users, weight and length of the address code, laser power, photodetector characteristics, and fiber length, by taking into account the effects of noise. The numerical results of these evaluations are presented