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We numerically demonstrate the dispersion map configured by random-based residual dispersion per span (RDPS) applied into the mid-span spectral inversion (MSSI) system to mitigate the impact of chromatic dispersion and the fiber nonlinearity in wavelength division multiplexed (WDM) signals. The dispersion map proposed was a scheme in which the RDPS of all optical fiber spans in the front section of the midway optical phase conjugator (OPC) are randomly selected, and the arrangement order of the RDPS in the rear section is inverted from that of the front section. Numerical simulations were performed by evaluating the compensation of the distorted 960 Gb/s WDM signal as a function of the variation of the DCF length and the SMF length, which are involved in determining RDPS. It was confirmed that the compensation effect of the proposed dispersion maps has improved compared to the conventional dispersion map since the dispersion maps examined in this paper have antipodal symmetry around the midway OPC. In particular, it was confirmed that the method of randomly determining the RDPSs by varying the DCF length slightly improved system performance compared to the variation of SMF lengths. We also found that the feature of the RDPS random distribution patterns can achieve excellent compensation for the distorted WDM signal through 50 iterations.

The weakness of the dispersion-managed link, which is combined with optical phase conjugation to compensate for optical signal distortion caused by chromatic dispersion and the nonlinear Kerr effect of the standard single mode fiber is, its limited structural flexibility. We propose a dispersion map that can simultaneously compensate for the distorted wavelength division multiplexed signal while increasing the configurational flexibility. Each residual dispersion per span (RDPS) in the former half of the proposed link is randomly determined, and in the latter half, the arrangement order of RDPS is the same as or inverted in the former half. We confirm that the dispersion maps in which the RDPS distribution pattern in the latter half is opposite to the arrangement order in the former half are more effective in compensation, and the compensation effect is better than in the dispersion map of the conventional scheme. The notable result of this study is that the flexibility can be increased by randomly arranging RDPS in the former half, and compensation improvement can be achieved by inversing the order of RDPS arrangement of the former half in the latter half, which makes the dispersion profile of each half link roughly symmetric with respect to the midway optical phase conjugator.

In high-capacity and long-haul optical communication systems, signal distortion is induced by the group velocity dispersion (GVD) and nonlinear Kerr effects of optical fibers. In this paper, we analyze the effects of the dispersion compensating fiber (DCF)'s position and the control position of the net residual dispersion (NRD) on the system performance in dispersion-managed (DM) wavelength division multiplexed (WDM) transmission links with the midway optical phase conjugator (OPC). It is confirmed that the desirable fiber arrangements to more improve the performance of WDM channels are the SMF then the DCF and are the DCF then the SMF before and after OPC, respectively. We also observed that the best concentrating position for the NRD control is obtained by postcompensation, i.e., by using the DCF in the last fiber span.

This paper proposes and discusses a flexible dispersion-managed link configuration comprising artificial distributions of linearly/nonlinearly incremented residual dispersion per span (RDPS), and an optical phase conjugator added at the midway. Regardless of the incremental scheme, the best distribution for compensating the distorted-wavelength multiplex signals is the simultaneous descending and ascending distribution of the RDPSs before and after the optical phase conjugator, respectively. Consequently, by artificially distributing the RDPSs according to span length, total transmission length, signal launch power, and the number of wavelength-division multiplexed channels, a flexible implementation of the optical links using the linearly or nonlinearly incremented RDPSs should be possible.