  We report a simple fiber-implemented technique for complete reconstruction of
intensity profile and phase of ultrashort laser pulses based on processing only
pulse spectrum and two self-phase modulated spectra measured after a short
piece of optical fiber. Its applicability is shown on an example of a fiber
optical system in the telecommunication range. A retrieval algorithm in a
dispersionless approximation and with considering dispersion effects is
developed. The obtained results are confirmed by independent measurements using
the second-harmonic generation frequency-resolved optical gating technique and
by reconstructing purposely introduced signal features. We also provide
estimates demonstrating great opportunities for implementing this technique in
all-waveguide optical systems ranging from optical communications to
nanophotonics with femtojoule pulses as well as to mid-IR photonics, where
specialty fibers with huge optical nonlinearities can be used.
