Abstract
Accumulation of high power in short pulse propagated in optical fiber is a fundmantal nonlinear problem that is of interest for numerous applications from laser physics to telecommunications. In the normal dispersion regime, the nonlinear dominated optical pulse broadening generally leads to wave breaking that manifests itself as wave-form steepening with subsequent growing oscillations in the pulse tails. However, there is an interesting class of breaking- free pulses with a parabolic wave-form in the energy-containing core that can propagate in a stable self-similar manner - holding a certain relation (scaling) between changes in pulse power, width and chirp. The effect of wave-breaking suppression is based on the fact that in presence of gain (in active fiber) pulse energy increases with propagation and relative role of nonlinear effects continuously grows compared to dispersion effects. Another way to achieve wavebreaking suppression is to use passive (without external pump) dispersion-decreasing fiber (DDF) where the relative impact of nonlinearity increases due to decreasing dispersion [1], The use of passive fiber is beneficial for a range of physical and technical problems (e.g. telecom signal processing, generation of a square temporal sw itching window for demultiplexing and others) where lùgli signal power is not strictly required. However, it was shown that the effect of third-order dispersion (TOD) is crociai for the parabolic pulse generation in DDF and it is necessary to use dispersion- flattened fiber [2], In this paper we present recent experimental result on lùgli-power pulse propagation and wavebreaking suppression in a dispersion-flattened tapered fiber with an appropriately varying core diameter acting as DDF with zero TOD. To demonstrate the effect of descreasing dispersion on pulse propagation we compare output spectra for pulse propagation over the DDF in the “forward” (decreasing dispersion) and “reverse” direction when dispersion increases along the fiber length.
© 2007 IEEE
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