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Propagation of few-cycle laser pulses in optical fiber is investigated beyondthe unidirectional approximation. Considered medium parameters includedispersion, Kerr and Raman nonlinearities. High intensities of ~10^10 kW/cm^2lead to generation of the octave-spanning continuum. The error of theunidirectional approximation is seen in simulations as two pulses propagatingforwards and backwards, both remain weak under the considered conditions.Direct analytical estimate of the error is derived and verified numerically. Itcan be applied to a priory justification of the unidirectional approach.

Propagation of intense few-cycle laser pulse in a telecommunication-type  optical fiber: analysis of the error introduced by the unidirectional  approximation