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A 60-channel Wavelength-Division Multiplexing (WDM) DP-DQPSK optical communication system for high data rate transmission is presented in this paper. The system has a transmitter, medium, and receiver. A Differential Quadrature Phase Shift Keying (DQPSK) modulator, polarization mapper, Mach–Zehnder Modulator (MZM), Continuous Wave (CW) laser, pulse shaping filter, and Erbium-Doped Fiber Amplifier (EDFA) are included in the transmitter. Together, these components enable reliable modulation, amplification, and transmission. Signals are sent across 200–1000 km using fiber optic tools and amplifiers. An optical detector transforms the signal to an electrical form at the receiver, followed by polarization demultiplexing, DQPSK demodulation, clock recovery, and low pass filtering for reliable data recovery. Testing showed that the system functions best with 100 GHz channel spacing, Low Bit Error Rates (BER), and high Q-factor. In contrast, tighter spacing (50 and 75 GHz) increases inter-channel crosstalk, lowers OSNR, and degrades performance at longer distances. For 50 GHz and 75 GHz spacings, the system works up to 400 km and 800 km, respectively. To improve performance across long distances and different situations, future research should concentrate on enhanced dispersion compensation, FEC, adaptive modulation, and channel spacing optimization.

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Implementation of High Data Rate DQPSK WDM System for Long-Distance Transmission and Under Different Channel Spacing

  • 会议论文

  • 发表日期：

    2025年

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  • Aqeel Ali Al-Hilali,
  • Basim Galeb,
  • Ali Ali Saberv,
  • Mustafa Bashar,
  • Hussein Alaa Diame

摘要

A 60-channel Wavelength-Division Multiplexing (WDM) DP-DQPSK optical communication system for high data rate transmission is presented in this paper. The system has a transmitter, medium, and receiver. A Differential Quadrature Phase Shift Keying (DQPSK) modulator, polarization mapper, Mach–Zehnder Modulator (MZM), Continuous Wave (CW) laser, pulse shaping filter, and Erbium-Doped Fiber Amplifier (EDFA) are included in the transmitter. Together, these components enable reliable modulation, amplification, and transmission. Signals are sent across 200–1000 km using fiber optic tools and amplifiers. An optical detector transforms the signal to an electrical form at the receiver, followed by polarization demultiplexing, DQPSK demodulation, clock recovery, and low pass filtering for reliable data recovery. Testing showed that the system functions best with 100 GHz channel spacing, Low Bit Error Rates (BER), and high Q-factor. In contrast, tighter spacing (50 and 75 GHz) increases inter-channel crosstalk, lowers OSNR, and degrades performance at longer distances. For 50 GHz and 75 GHz spacings, the system works up to 400 km and 800 km, respectively. To improve performance across long distances and different situations, future research should concentrate on enhanced dispersion compensation, FEC, adaptive modulation, and channel spacing optimization.