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Abstract
In this thesis, we give an overview on optical code division multiple access (CDMA) networks •. and we discuss how to design arTaY waveguide (A WG) routers, tapped delay lines and we propose a new implementation for noisy static 2-D OCDMA con-elationlchip level receivers using array wave grating (A WG) instead of fiber bragg grating FBG.
Also we show that the dynamic allocation of signature sequences can improve the utilization of optical code-d;v;s;on mult;ple-access local-area and access networks. Th;s dynamic allocation scheme further provides a quality-of-service guarantee on the maximum bit-error rate. We demonstrate that different sets of asymmetric prime hop codes, with a fixed number of wavelengths but varying number of time chips. could be used to implement the dynamic allocation technique. For a dynamic system using codes with 31 wavelengths arid between 25 and 49 time chips. an order of magnitude improvement in utilization perfomlance can be achieved over a system with static code allocation when the number of active users on the system is small (less than 15). Further. the bit-error rate is shown never to increase beyond the selected quality-of-service level of IO~.
The eftect of both shot & themtal nOIses on the performance of 2-D wavelength hopping/time spreading CDMA static and dynamic systems is analyzed. Noise variance and probability of error are calculated for general systems employing asymmetric prime-hop codes (APHCs). A comparison is held between the performance of static/dynamic noisy chip level receivers. noiseless correlation receivers and noisy correlation receivers. We have proposed four new systems; dynamic 2-D transmitter using Array wave grating (A WG). dynamic 2-D correlation receiver using A WG, static and dynamic 2-D chip level receivers using A WG. The analysis reveals that the performance of the static/dynamic chip level receiver is better than the correlation receiver. Furthermore. this thesis shows that the system utilization is improved when using dynamic code allocation.