Long-distance signal transmission, made possible with in-line optical amplifiers , suffers from nonlinear phenomena arising in optical fibers. A transmitted signal very near the zero- dispersion wavelength undergoes a remarkable noise increase due to four-wave mixing (FWM) between the signal and the amplified spontaneous emission (ASE) . On the other hand, when the signal wavelength is further away from the zero-dispersion wavelength, the combined effect of self-phase modulation (SPM) and group-velocity dispersion (GVD) causes waveform distortion and limits the allowable transmission distance. Although compensation of GVD is effective in alleviating this limitation ,, no quantitative discussion has been carried out. In this paper, GVD compensation in in-line amplifier systems is evaluated by numerically solving the nonlinear Shrodinger equation (NLSE). Improvement in transmission distance and the optimum amount of dispersion compensation are clarified.
© 1993 Optical Society of AmericaPDF Article
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