We present a theoretical calculation which shows that optical solitary waves can propagate in an optical fibre in the femiosecond regime. The optical fibre which can support such a wave must exhibit negative third-order dispersion (β‴0<0) and must be used close to an appropriate ‘operating’ point (6β″/ω0β‴≃1). Use of these waves will further increase the bandwidth of optical fibre communication systems.
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