Frequency tunable polarization and intermodal modulation instability in high birefringence holey fiber

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.