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In this paper, the authors explain and analyze Bit Error Rate (BER) performance for optical communication system using Differential Phase Shift Keying (DPSK) modulation scheme. Specifically, after developing an approximate form BER expression, they explain the BER performance for different system parameters such as fiber length, gain and number of amplifier. With the aid of analysis and simulation results they demonstrate the influence of different system parameters on the BER performance of an optical system using differential modulation schemes.
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