The effects of nonlinearity on sub-500 fs pulse transmission over dispersion compensated fiber links using dispersion compensating fiber technique are investigated numerically and experimentally. The pulse broadening and recompression ratio of the 2.5-km transmission link is over 300. The postcompensated and precompensated links are compared when the input pulse energy ranges from 15 to 150 pJ. At high powers, self-phase modulation (SPM) degrades the pulse recompression process and provides an upper bound on the transmitted pulse energy. The SPM effect is stronger in the postcompensated link than in the precompensated link. A dramatic spectral narrowing effect was observed in the postcompensated link. Pulse energies up to tens of pJ, consistent with high quality communication, should be possible for a sub-500 fs pulse in such dispersion compensated links.
We demonstrate the use of a femtosecond pulse-shaping apparatus for electronically programmable phase filtering of amplified spontaneous emission from an erbium-doped fiber amplifier. Pulse shaping applied to a broadband incoherent light (noise) input results in reshaped noise, with a specially tailored electric field correlation function. Our experiments clearly reveal that phase filtering can strongly affect the coherence properties of broadband, phase-incoherent light.
We apply femtosecond pulse shaping techniques[1,2] for electronically programmable phase filtering of broadband incoherent light at 1.5 µ m. Pulse shaping applied to incoherent light results in tailoring of the electric field coherence function, in contrast to the pulse intensity and phase profile, as in the usual coherent femtosecond pulse shaping experiments. Our results may have applications in broadband communications using coherence coding for time-division multiplexed data transmission[3] or code-division networking[4] as well as in time-resolved spectroscopy using incoherent light.
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