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Experimental analysis of ultrashort pulse propagation in optical fibers around zero-dispersion region using cross-correlation frequency resolved optical gating

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Abstract

Ultrashort pulse propagation at λ=1.55µm in polarization maintaining dispersion shifted fiber is experimentally analyzed using cross-correlated frequency resolved optical gating (X-FROG). The generated soliton pulse is picked out with the spectral filter and is used as the probe pulse. The temporal distributions of the spectral components in the generated pulses are observed. The initial process of the pulse breakup is directly observed for the first time. The results of X-FROG traces are in agreement with the measured cross-correlation traces and the optical spectra. It is shown that the generated soliton pulse and the anti-stokes pulse are partially overlapped and almost copropagate along the fiber.

©2001 Optical Society of America

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Figures (5)

Fig.1
Fig.1 Experimental setup of X-FROG measurement at the output of the optical fibers. The stokes pulse is picked out using the spectral filter and is used as the probe pulse
Fig.2
Fig.2 Measured (a) optical spectrum and (b) auto-correlation trace of the laser output pulse.
Fig.3
Fig.3 Observed (a) optical spectra, (b) cross-correlation trace, and (c) X-FROG trace for the output of 4 m length of PM-DSF. The inset in (c) shows the measured SHG-FROG trace of the probe pulse. The measured delay time in PM-DSF is also shown in (a).
Fig.4
Fig.4 Movie of the observed X-FROG traces for initial process of pulse breakup when the fiber length is changed from 2 to 5 m at interval of 1 m. The fiber input power is fixed at 24 mW. (189K)
Fig. 5
Fig. 5 Observed X-FROG traces and the corresponding optical spectra and cross correlation traces. (a)–(c) fiber length is 10 m and input power is 24 mW, (d)–(f) fiber length is 180 m and fiber input power is 20 mW. In the X-FROG traces (d) for 180 m fiber, since the delay time is as large as 200 ps, only the observed traces of soliton and anti-stokes pulses are shown. The cross correlation trace in (f) corresponds to the bottom of the soliton pulse and the anti-stokes pulses.
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