Abstract
In this paper, we numerically investigate the performance of orthogonal optical chaotic division multiplexing (OOCDM) based on active–passive decomposition utilizing semiconductor lasers. To the best of our knowledge, it is the first time that two necessary conditions including chaotic synchronization condition and orthogonal condition of chaotic carriers are defined to quantify the performance of OOCDM. The chaotic characteristics of the output optical powers, including time traces, RF power spectra, and auto-correlation function, are numerically analyzed. The effects of spontaneous emission noise and the following internal and external parameter mismatch on the performance of OOCDM are analyzed in detail, which include gain saturation coefficient, photon lifetime, carrier decay rate, carrier number at transparency, differential gain, linewidth enhancement factor, and pumping current. The numerical results show that the proposed OOCDM system is robust towards spontaneous emission noise and parameter mismatch for certain relative mismatch ratios.
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