伝送パワー最適化によるソリトン相互作用の低減

概要

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Soliton-based communication systems currently use a launch power above the N=1 soliton power level (typ. 1.2〜1.4), due to the fiber loss in between optical amplifiers. This has been extensively shown by the pre-emphasis and guiding-center soliton methods. The higher power compensates for the additional dispersive pulse broadening near the end of each amplifier section, where the attenuated optical power is below the soliton power. Here show that increasing the power level even further (N=1.9) has additional benefits. In ultra high bit-rate soliton-based communication systems, too narrow a pulsse results in a short dispersion length, and thereby a limited transmission distance. On the other hand, if solitons are too wide, pulse interaction occurs, limiting the maximum transmission distance. We choose here 6.25-ps full-width half maximum pulses in a 40 Gb/s system as a trade-off: interaction length above 2500 km, while maintaining a soliton period (150 km) well above amplification period. We will investigate with numerical simulations how to extend transmission distance by optimizing launch power.
社団法人電子情報通信学会の論文
1994-09-26