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Performance Investigation of NRZ-DQPSK, CSRZ-DQPSK and MDRZ-DQPSK Modulation Techniques for 450 Channel UD-WDM System for Long Haul Communication: ANALYSIS OF MODULATION TECHNIQUES FOR LONG HAUL UD-WDM SYSTEM. JSIR 2023, 82 (08), 870-884. https://doi.org/10.56042/jsir.v82i08.1053.