Published Paper Details:

In this paper, the performance of cost efficient direct detection OCDMA code is evaluated in terms of overall reach and received Quality of information. This work focuses on the suppression of environmental temperature variation effects that occur in the transmission links that impact the expected magnitude of the autocorrelation peak in the users’ code. The FLC system, whose input variables are the propagation distances and the estimated temperature changes, is installed in the network receivers. This system sets the threshold detection level according to the variations of the environmental temperature provided by external sensors.Evaluation has been carried out by changing wavelength and time dimensions by keeping third dimension constant. Moreover, different distances are taken into account to measure the reach within the acceptable limits of bit error rate (BER). Requirement of star coupler is eliminated by designing 3-D code division reliant on only time delays thus to make system cost efficient. Simulation results revealed that with the increase of wavelength/ time dimensions, more interference is observed and system works for 125 Km for W/T=3 and 110 Km for W/T=4. Also, a comparative analysis has been done between Wavelength/Time/Space and Wavelength/Time/Polarization 3-D OCDMA.