Abstract

Ultralong nonreturn-to-zero optical transmission systems with incomplete dispersion compensations are studied. The dispersion of transmission fiber is periodically under-or overcompensated. Postdispersion compensation (PDC) at the receiver is used to compensate for the residual dispersion caused by incomplete compensation and to tailor the signal pulse shape. Formulas estimating the change of pulse width in the absence of amplifier noise during signal transmission and after PDC are given. During signal transmission, pulse width may be compressed or broadened by the combined effect of the dispersion and self-phase modulation (SPM). The change of pulse width nearly increases with the square of the distance during signal transmission. With amplifier noise, system performance evaluated by Q factor is studied. Several types of transmission fibers are considered. The Q factor can be significantly improved by proper PDC. Signal pulse is compressed when PDC is optimized. The characteristics of the maximum Q factor and the residual dispersion are studied, in which PDC is optimized. The results show that to achieve the best system performance, fiber dispersion should be undercompensated for positive dispersion parameter and overcompensated for negative dispersion parameter. The optimal fiber dispersion lies in the range from 4 to 10 ps/km/nm for the considered systems, and the optimal ratio of residual dispersion and fiber dispersion is about 1%.

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J. Lightwave Technol. (9)

H. Taga, S. Yamamoto, N. Edagawa, Y. Yoshida, S. Akiba and H. Wakabayashi, "The experimental study of the effect of fiber chromatic dispersion upon IM-DD ultra-long distance optical communication systems with Er-doped fiber amplifiers using a 1000 km fiber loop", J. Lightwave Technol., vol. 12, pp. 1455-1461, 1994.

F. Metera and M. Settembre, "Comparison of the performance of optically amplified transmission systems", J. Lightwave Technol., vol. 14, pp. 1-12, 1996.

R. J. Nuyts, Y. K. Park and P. Gallion, "Dispersion equalization of a 10 Gb/s repeatered transmission system using dispersion compensating fibers", J. Lightwave Technol., vol. 15, pp. 31-42, 1997.

R. W. Tkach, A. R. Chraplyvy, F. Forghieri, A. H. Gnauck and R. M. Derosier, "Four-photon mixing and high-speed WDM systems", J. Lightwave Technol., vol. 13, pp. 841-849, 1995.

W. Zeiler, F. D. Pasquale, P. Bayvel and J. E. Midwinter, "Modeling of four-wave mixing and gain peaking in amplified WDM optical communication systems and networks", J. Lightwave Technol., vol. 14, pp. 1933-1942, 1996.

D. Marcuse, "RMS width of pulses in nonlinear dispersive fibers", J. Lightwave Technol., vol. 10, pp. 17-21, 1992.

M. Florjanczyk and R. Tremblay, "RMS width of pulses in nonlinear dispersive fibers: pulses of arbitrary initial form with chirp", J. Lightwave Technol., vol. 13, pp. 1801-1806, 1995.

N. Kikuchi and S. Sasaki, "Analytical evaluation technique of self-phase-modulation effect on the performance of cascaded optical amplifier systems", J. Lightwave Technol., vol. 13, pp. 868-878, 1995.

S. Wen, "Bi-end dispersion compensation for ultralong optical communication system", J. Lightwave Technol., vol. 17, pp. 792-798, 1999.

Opt. Lett. (2)

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