Abstract
We present an experimental analysis of polarization and intermodal noise-seeded parametric amplification, in which dispersion is phase matched by group velocity mismatch between either polarization or spatial modes in birefringent holey fiber with elliptical core composed of a triple defect. By injecting quasi-CW intense linearly polarized pump pulses either parallel or at 45 degrees with respect to the fiber polarization axes, we observed the simultaneous generation of polarization or intermodal modulation instability sidebands. Furthermore, by shifting the pump wavelength from 532 to 625 nm, we observed a shift of polarization sidebands from 3 to 8 THz, whereas intermodal sidebands shifted from 33 to 63 THz. These observations are in excellent agreement with the experimental characterization and theoretical estimates of phase and group velocities for the respective fiber modes.
Highlights
Photonic crystal fibers (PCFs) provide a unique testbed for exploring complex nonlinear optical processes such as transient Raman scattering [1] and polarization or cross-phase vector modulational instabilities [2,3,4,5]
Abstract: - We present an experimental analysis of polarization and intermodal noise-seeded parametric amplification, in which dispersion is phase matched by group velocity mismatch between either polarization or spatial modes in birefringent holey fiber with elliptical core composed of a triple defect
By injecting quasi-CW intense linearly polarized pump pulses either parallel or at 45 degrees with respect to the fiber polarization axes, we observed the simultaneous generation of polarization or intermodal modulation instability sidebands
Summary
Photonic crystal fibers (PCFs) provide a unique testbed for exploring complex nonlinear optical processes such as transient Raman scattering [1] and polarization or cross-phase vector modulational instabilities [2,3,4,5]. Nonlinear PCFs exhibit tight confinement of light owing to their small modal cross sections, whereas engineering of the hole and pitch structures enables tailoring of the frequency dependence of modal group velocities and group velocity dispersions [6]. Based on these properties, it is expected that PCFs will represent a basic component in nonlinear optical devices such as parametric frequency converters [7] and oscillators [8]. In order to achieve sideband shifting, we exploited the strong frequency dependence of polarization and intermodal group velocity mismatch (GVM) in the birefringent PCF with triple defect in the hexagonal lattice [19]
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