Abstract

We report the generation of 30-W peak-power 250-fs-wide pedestal-free optical pulses at 1.54 μm by use of a chirp-compensated optically amplified semiconductor laser followed by simultaneous soliton compression and shaping within a nonlinear optical loop mirror. A weak controllable attenuation is inserted within the loop to permit precise control of the pulse shape. Pedestal-free pulses are obtained after optimization of both the fiber length and the power balance between the counterpropagating pulses within the loop. The corresponding spectrum reveals a twofold split structure that is due to a residual chirp from self-phase modulation.

© 1994 Optical Society of America

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