The performances of optical code-division multiple access communication systems
The effect of the beat noise is examined in for the 1-D and 2-D incoherent OCDMA schemes. Both coherent and incoherent practical light sources are considered. In addition, total asynchrony across all transmitters is assumed in the analysis. The performances of different standard receiver structures are evaluated and compared. It is found that the chip-level receiver is no longer optimal with the consideration of beat noise and a modification is proposed. Two nonlinear receivers for the ultrashort-pulse spectral phase encoding OCDMA system are examined. These two receivers, employing the second harmonic generation (SHG) and the self phase modulation (SPM) effects in optical media are modeled and analyzed. An analytical result is derived to estimate the performance of the SHG-based receiver. Simulations are performed with different values of the nonlinear coefficients and different spreading sequences. At last, a comparison between different OCDMA schemes is given, in terms of both performance and practicality.
Lehnert, Purdue University.
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