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Electrostrictional Interaction of Optical Pulses in Long Distance Soliton Communication Systems

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Abstract

Mollenauer et al. have experimentally demonstrated the transmission of optical solitons in a single mode fiber over large distance up to 10000 km [1]. One of the limitations to the transmission rate in the soliton regime of propagation is an interaction between optical pulses. Besides the well studied short-range Kerr-like interaction, Smith and Mollenauer experimentally discovered the interaction of the two periodic trains of 55-ps solitons shifted in time on several dozens of soliton widths for propagation distance of 3000 km [2]. In [3,4] we suggested and developed the theory of a mechanism of long-range interaction of solitons - electrostrictional interaction. According to this theory an optical pulse excites an acoustic wave, propagating in transverse direction to the fiber axis. This leads to the temporal perturbation of the fiber effective refractive index. In consequence, the following optical pulses become phase-modulated and change their carrier frequency. That results in additional temporal shift of solitons. We have obtained a good quantitative agreement [4] with experimental results of [2] on interaction of two soliton pulse trains.

© 1991 Optical Society of America

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