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Schemes for Compensation of Chromatic Dispersion in Combined HDWDM SystemsDOI: 10.2478/v10047-011-0033-6 Keywords: high density wavelength division multiplexing (HDWDM), chromatic dispersion (CD) compensation methods, differential phase shift keying with non-return-to zero coding (NRZ-DPSK), binary-state polarization shift keying (2-POLSK), on-off keying with NRZ coding (NRZ-OOK), fiber Bragg grating (FBG), optical phase conjugator (OPC), dispersion compensating fiber (DCF) Abstract: The authors seek best ways to realize chromatic dispersion (CD) compen-sation schemes for differently modulated optical signals in high-speed mixed data rate HDWDM systems. The research is based on OptSim 5.1. simulation software, which numerically solves nonlinear Schr dinger equation using the split-step Fourier method. It is shown that the CD compensation scheme is crucial for the performance evaluation in combined HDWM transmission channels. Therefore, a scheme of the type is proposed that is suited best for a very complicated combined fiber optical transmission system. It is also found that asymmetrical CD compensation schemes in pre- and post-compensation modules are the most efficient, allowing the best BER in a channel to be achieved.
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