Transmission performance of 10-Gb/s DPSK WDM signals due to phase-error and four-wave mixing in SOAs |
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Authors: | Sub Hur |
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Affiliation: | Department of Radio Engineering, Korea University, 1, 5Ka, Anam-dong, Sungbuk-gu, Seoul 136-713, Republic of Korea |
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Abstract: | We present a complete dynamic model of semiconductor optical amplifiers (SOAs) including the inter-channel four-wave mixing (FWM). The model has been implemented using the time-dependent transfer matrix method (TMM) and applying the discretization scheme in both the spatial and spectral domains. In SOA-based wavelength division multiplexing transmission systems using 10-Gb/s differential phase shift keyed (DPSK) signals, the system performance due to the SOA-induced phase-error and the FWM effect has been analyzed. By the injection of a reservoir channel into SOAs, the transmission performance of non-return-to-zero (NRZ) DPSK signals can be improved through the phase-error reduction. Both the NRZ-DPSK and return-to-zero (RZ) DPSK signals are found to be suffered from the FWM-induced crosstalk. The overall nonlinear tolerance of RZ-DPSK is shown to be better than that of NRZ-DPSK. |
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Keywords: | DPSK SOA Four-wave mixing Optical communication Optical modulation |
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