Experiment and theory of tunable braodband parametric gain in a photonic crystal fiber

We present theoretical and experimental studies of both scalar and polarization or modal pump-divided parametric amplification in photonic crystal fibers. In the scalar case, we discuss broadband parametric amplification at telecom wavelengths near 1550 nm. With a pump-divided scattering process, we discuss the possibility of widely tunable frequency conversion and four-wave mixing gain at visible wavelengths. We confirmed the theory by experiments where intense, linearly polarized pump pulses at wavelengths ranging from 532 to 625 nm led to the spontaneous generation of modulation instability sidebands with frequency shifts ranging from 3 up to 63 THz. The observations were in good agreement the experimental characterization and theoretical modelling ofthe linear and nonlinear properties of the PCF.

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