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. Journal of Scientific & Industrial Research (JSIR), [S. l.], v. 82, n. 08, p. 870–884, 2023. DOI: 10.56042/jsir.v82i08.1053. Disponível em: https://or.niscpr.res.in/index.php/JSIR/article/view/1053. Acesso em: 15 may. 2026.