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Using a Karhunen - Lo?ve Series Expansion (KLSE) based quasi-analytical method for BER calculation, the authors investigate performance optimization for 44 Gb/s Return-to-Zero (RZ) Partial DPSK (PDPSK) transceiver with reduced component bandwidth, where the optimization is done by preemphasizing the gain shape of electrical signal driving path in the transmitter and varying the Free Spectral Range (FSR) of the Delay Line Interferometer (DLI) in the receiver. Both weak and strong optical filtering are studied, where the strong optical filtering case models long haul systems containing cascaded Optical Add Drop Multiplexers (OADMs).
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