• Journal of Advanced Navigation Technology
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• v.28 no.4
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• pp.552-558
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• 2024

In dispersion management, which involves additionally inserting a dispersion compensation fiber of an appropriate length to eliminate or reduce the chromatic dispersion of a single-mode fiber, determining the form of the dispersion map, which is the cumulative dispersion profile according to the transmission distance, is the most basic and important. In this paper, the various symmetric dispersion map based on trapezoids applied to dispersion-managed links combined with mid-span spectral inversion (MSSI), which compensates for the distortion caused by Kerr nonlinear effects through optical phase conjugation in the middle of the entire transmission link are proposed, and the effect of each dispersion map on distortion compensation of wavelength division multiplexed (WDM) signals is analyzed. Although the degree of compensation varies depending on the factors that determine the detailed shape of the proposed trapezoid-shaped dispersion map and RDPS (residual dispersion per span), overall, it was confirmed that distortion compensation for signals with a small extinction ratio was more effective than distortion compensation for WDM channel signals with a large extinction ratio.

• Journal of Advanced Navigation Technology
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• v.28 no.5
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• pp.732-737
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• 2024

We systematically studied the chromatic dispersion and nonlinear distortion compensation characteristics of 24-channel × 40 Gb/s wavelength division multiplexed (WDM) signal in a mid-span spectral inversion (MSSI) system with dispersion-managed link. WDM signals are transmitted over dispersion-managed link consisting of an 80 km × 48 fiber span including erbium-doped fiber amplifier (EDFA). The dispersion map applied to this dispersion-managed link has trapezoidal shape with various structures. The trapezoid-shaped dispersion map examined in this paper are designed with configuration in which the cumulative dispersion profile has positive or negative value in each section before and after the optical phase conjugator. Through simulation, it was confirmed that the proposed trapezoid-shaped dispersion map is effective in compensating for distorted WDM channel signals when the dispersion map is configured with the small RDPS (residual dispersion per span).