Improvement in the Spectral Efficiency Achieved in OCDMA Using 1-Dimensional OOCs
An Optical Orthogonal Code (OOC) is defined as collection of binary sequences with good auto and cross-correlation properties. Unlike bipolar code having correlation side-lobes and cross-correlation function close-to-zero, for OOC's the best correlation side-lobes and cross-correlation function is unity, which means that no distance between the positions of ones in the code are repeated. In this paper, the authors study the spectral efficiency that can be achieved in OCDMA using the OOC's. the results are compared s with other codes in the same unipolar family. It is seen that, the maximum spectral efficiency that can be achieved with the unipolar codes remains low due to the positive nature of the optical channel.