This project focuses on the design and performance analysis of an Optical Differential Phase Shift Keying (DPSK) communication system using a 66% Return-to-Zero (RZ) signal format. It explores the advantages of phase-based modulation in enhancing receiver sensitivity and nonlinear tolerance in. The focus of this paper is to directly compare QPSK with DP-QPSK based on different parameters such as optical fiber length, different data rates, different wavelengths etc. The bit is shifted in frequency domain by discrete Fourier transform. 1Government College of Engineering Srirangam, Trichy, Tamilnadu, India 2Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, Tamilnadu, India. *Corresponding author: sarojiniraju18@gmail. com Abstract: At key. State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an, China 2.
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