Fiber-optical compressor based on dispersion management

Summary form only given. Fiber-optical methods are one of the most powerful techniques for laser pulse compression. Both fiber-grating compression and multisoliton compression are the most preferable non-linear fiber-optical methods for compression of laser pulses and they are applicable for the pulses of carrier frequency correspondingly within the field of positive as well as of negative group velocities dispersion in quartz optical waveguides. Contemporary progress in technology and performances of fibers, especially of fibers with shifted dispersion allows the production of fiber of positive as well as of negative dispersion at the same fixed wavelength. The results of investigation of simple all-optical fiber compressor, based on an idea of dispersion management using fiber of positive dispersion in the first part and of negative dispersion in the second one at the working wavelength, are presented. The method allows combination of the advantages of the classic fiber-grating and of the multisoliton compression. It is possible to improve substantially the quality of the compressed pulse compared to the multisoliton compression. The compression factor could be increased up to 2-2.5 times when the fraction of the input pulse energy appearing within the compressed pulse enhances more than 2 times. Thus, the peak power of the compressed pulse can be increased about 5 times and the quality of the obtained pulses would be comparable with those obtained by the fiber-grating compressor. It is shown, that such techniques are applicable to pulses with a Gaussian shape as well as to the pulses corresponding to an integer number of the optical soliton with such a temporal shape. The Gaussian profile better describes the pulse shape, when the pulses correspond to the output of the mode-locked solid-state lasers