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Performance Assessment of Optical Networks with CDMA

This study presents a new methodology for evaluating optical DS/CDMA systems and discusses the impact of dispersion on system performance. Comparative analysis of prime codes and orthogonal codes' sensitivity to fiber length is provided. Simulation results show the importance of selecting codes based on dispersion tolerance for optimal performance. A developed simulator demonstrates a robust system operating at high speeds with minimal penalty.

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Performance Assessment of Optical Networks with CDMA

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  1. Performance Assessment of Optical Networks with CDMA Paulo M. Mendes DS/CDMA System Model System Operatingat 10 Gchip/s Coding Sequence (1001101) Effect of Dispersion on Eye Opening Data Sequence (1011) TC with N = 129 w = 3 C = 6 PC with N = 121 w = 11 C = 11 Coded Sequence TX Effect of Dispersion on Probability of Error PC with N = 529 w = 23 PC and OOC RX System Operatingat 20 Gchip/s APD input MGF of V(ts) Simulation Methodology Generation of the optical symbol sequence, propagation through linear fibre channel and reception with Butterworth low-pass filter; Performance estimation using the moment generating function of the output distribution with the saddle point approximation. PC with N = 529 L = 5 D = 37 Mbit/s PC with N = 121 L = 5 D = 165 Mbit/s Conclusions A new methodology for performance evaluation of optical DS/CDMA systems was developed; The prime codes are more sensitive to the fibre length than optical orthogonal codes; The dispersion tolerance depends of the relation between the code length and number of chips in the code and a longer code does not imply an improvement on dispersion tolerance; The codes to be used in DS/CDMA systems must be selected taking into consideration their dispersion tolerances; We simulated a system operating at 20 Gchip/s with a penalty < 2 dB, for L=10 km and Pe=10-9. Developed Simulator

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