Abstract
The bit error rate (BER) performance of direct sequence optical code division multiple access with cascaded optical amplifiers is analytically investigated in presence of fiber group velocity dispersion (GVD) and self phase modulation (SPM). Super Gaussian-shaped optical orthogonal codes are employed as address sequence for intensity modulation direct detection technique. The signal to noise power ratio for the proposed system is calculated on account of receiver, optical amplifier, and multiuser access interference noises. The system performance is determined as a function of optical signal power, code length, code weight, number of simultaneous users, fiber length, and order of Super Gaussian. The power penalty suffered by the system is evaluated at BER of 10-9. The numerical results show that the BER performance of the proposed system is highly dependent on the input signal power, bit rate, fiber length, and shape of the chip. It is found that the performance of the proposed system can be improved significantly in presence of GVD and SPM using Gaussian shaped chip.
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