A newly combined code-designing method of two-dimensional signature codes for OCDMA system

Abstract

A new kind of two-dimensional optical orthogonal code named ESPC/OCS is constructed, which uses the extend square prime code (ESPC) for time spreading and the one-coincidence sequence(OCS) for wavelength hopping. The performance of ESPC/OCS is analyzed and the mean value of cross-correlation is deduced. Meanwhile the bit error ratio (BER) for codes is simulated and compared. The simulation results show that given p and q, the BER of ESPC/OCS is reduced, and the capacity is enlarged, when the number of hopping codes p is increased. Given OCS (given q and d), when p is changed, only the capacity is changed, but the BER is almost the same. The performance of ESPC/OCS is better than that of PC/OCS.

Keywords

Code Length / Time Spreading / Prime Code / Code Weight / Simultaneous User

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