Highly functional optical control using ultrafast nonlinear optical effects induced by ultrashort pulse

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Using the ultrashort pulse and such highly nonlinear fibers, we can obtain large nonlinear optical effects effectively. The group of author has been working on the highly functional optical control using ultrafast nonlinear optical effects induced by ultrashort pulse. We have demonstrated 1.55 - 2.0 μm and 1.0 - 1.7 μm widely wavelength tunable ultrashort pulse generation system by use of ultrashort pulse fiber laser and optical fibers. We have also demonstrated 1.0 - 2.0 μm ultrawideband super continuum generation using ultrashort pulse fiber laser and highly nonlinear fibers. Recently, low noise and highly coherent high quality super continuum generation has been demonstrated for the first time. When the optical pulses overlap in the optical fibers, the pulse trapping occurs and they copropagate along the fibers under some conditions. The author has discovered the two novel pulse trapping phenomena. One of them is the pulse trapping across the zero-dispersion wavelength. In this phenomenon, the optical pulse at normal dispersion region is trapped by the ultrashort soliton pulse at anomalous dispersion region. We can tune the wavelength, output time, and temporal shape of trapped pulse. We can also trap the only one pulse in the pulse train selectively using this technique. The other pulse trapping phenomenon is between the orthogonally polarized ultrashort pulses in polarization maintaining fibers. We can also amplify the trapped pulse using this phenomenon. The highly functional ~1 THz ultrafast all optical switching was also demonstrated by use of these techniques.