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<p>Dispersion is one of the most significant problems in optical fiber communication systems as it causes a limitation on the transmission length and leads to inter-symbol interference (ISI). Dispersion Compensating Fiber (DCF) is widely used as a compensation technique to counteract dispersion in optical systems. Furthermore, FBG represents another dispersion compensation technique that exists in various structural designs, including UFBG (Uniform Fiber Bragg Grating), IDCFBG (Ideal Dispersion Compensation Fiber Bragg Grating), and CFBG (Chirped Fiber Bragg Grating). These configurations have been extensively investigated in previous studies and have demonstrated high effectiveness in mitigating chromatic dispersion and nonlinear effects. This paper investigates the impact of DCF, CFBG, UFBG, IDCFBG dispersion compensation techniques by symmetrical-compensation method measuring the Q-factor, BER performance and Eye-diagram. Using OptiSystem 7.0, we simulate four channels of WDM optical system operating at 40 Gbps with Differential Quadrature Phase Shift Keying (DQPSK) modulation. Our results indicate that the DCF-based approach provides superior performance, whereas the FBG-based techniques failed to offer effective compensation for dispersion impairments in optical fibers with DQPSK proposed modulation. Consequently, the study was extended using the DCF technique to determine the optimal input power for transmission distances of 435, 1015, 1595, and 1741 km, employing pre-, post-, and symmetrical-compensation schemes. Furthermore, to verify the uniformity of dispersion compensation within the WDM system, we analyzed the Q-factor performance across the four proposed WDM channels. The results demonstrated a consistent and uniform dispersion compensation behavior. To further enhance the maximum achievable transmission distance, based symmetrical-compensation management hybrid configurations combining DCF with UFBG and IDCFBG structures were also investigated. Among these, the DCF–IDCFBG configuration exhibited the best performance, achieving a maximum transmission distance of 3555 km, followed by the hybrid DCF–UFBG with 2031 km, and the standalone DCF technique with 1959 km.</p>

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Performance evaluation of dispersion compensation techniques with DCF, hybrid DCF-UFBG, and DCF-IDCFBG for WDM system using DQPSK modulation in long-haul optical transmission system

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • B. Guenad,
  • H. A. Bakir,
  • H. A. Benghenia,
  • D. Haimoune

摘要

Dispersion is one of the most significant problems in optical fiber communication systems as it causes a limitation on the transmission length and leads to inter-symbol interference (ISI). Dispersion Compensating Fiber (DCF) is widely used as a compensation technique to counteract dispersion in optical systems. Furthermore, FBG represents another dispersion compensation technique that exists in various structural designs, including UFBG (Uniform Fiber Bragg Grating), IDCFBG (Ideal Dispersion Compensation Fiber Bragg Grating), and CFBG (Chirped Fiber Bragg Grating). These configurations have been extensively investigated in previous studies and have demonstrated high effectiveness in mitigating chromatic dispersion and nonlinear effects. This paper investigates the impact of DCF, CFBG, UFBG, IDCFBG dispersion compensation techniques by symmetrical-compensation method measuring the Q-factor, BER performance and Eye-diagram. Using OptiSystem 7.0, we simulate four channels of WDM optical system operating at 40 Gbps with Differential Quadrature Phase Shift Keying (DQPSK) modulation. Our results indicate that the DCF-based approach provides superior performance, whereas the FBG-based techniques failed to offer effective compensation for dispersion impairments in optical fibers with DQPSK proposed modulation. Consequently, the study was extended using the DCF technique to determine the optimal input power for transmission distances of 435, 1015, 1595, and 1741 km, employing pre-, post-, and symmetrical-compensation schemes. Furthermore, to verify the uniformity of dispersion compensation within the WDM system, we analyzed the Q-factor performance across the four proposed WDM channels. The results demonstrated a consistent and uniform dispersion compensation behavior. To further enhance the maximum achievable transmission distance, based symmetrical-compensation management hybrid configurations combining DCF with UFBG and IDCFBG structures were also investigated. Among these, the DCF–IDCFBG configuration exhibited the best performance, achieving a maximum transmission distance of 3555 km, followed by the hybrid DCF–UFBG with 2031 km, and the standalone DCF technique with 1959 km.