The Application Of DPSK-Based Novel Modulation Formats In High-Speed Optical Transmission Systems

Rapid development of optical fiber transmission based on wavelength division multiplexing (WDM) technology has brought a big revolution to the whole communication structure. The limitations in high-capacity, long-haul dense wavelength division multiplexing (DWDM) systems also become more obviously. Correspondingly, several key technologies which aim at overcoming these limitations have been put forward and investigated, among which the novel modulation formats is one of the most effective methods.This dissertation focuses on the transmission performance evaluation of differential phase-shift keying (DPSK)-based modulation formats in a 40×40Gbit/s DWDM system. The main work is given as follows:1. System designs based on DPSK modulation formatsPerformance analyses of a variety of fibers (SMF28, LEAF, TrueWave RS and PureGuide) using NRZ-DPSK, RZ-DPSK, CSRZ-DPSK respectively are studied in detail in a 40×40Gb/s DWDM transmission system. And the performance comparison of the three DPSK-based modulation formats is also investigated. Simulation results indicate that the optimum choice of the fiber depends on the application requirements as well as the type of the system, and the optimum choice of modulation formats also depends on the whole system configuration. It has to be some tradeoffs when conducting the system design.2. Transmission performance of CRZ-DPSK modulation formatTransmission performance of CRZ-DPSK modulation format is investigated under different channel spacings and compared with RZ-DPSK format in a 40×40Gbit/s DWDM transmission system for the...