Abstract
Recently, there has been great interest in nonlinear fiber effects on long-distance and high-speed transmission in cascaded optical-amplifier systems.1–3 In particular, self-phase modulation (SPM) causes pulse-shape changes in intensity-modulated (IM) optical signals through fiber dispersion and can limit the maximum transmission distance.4 To date, the SPM effect has been evaluated by numerical calculations, such as the split-step Fourier method,1 but this has required a large amount of calculation. In this paper we propose an approximate analytical evaluation technique for the SPM effect, which is represented by the equivalent a-parameter, and we evaluate, for the first time to our knowledge, the theoretical maximum transmission distance limited by SPM.
© 1993 Optical Society of America
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