Phase-locked carrier-envelope-offset frequency at 1560 nm.

We report on the measurement of an Erbium-fiber oscillator's carrier-envelope-offset frequency using an extruded SF6 photonic crystal fiber for the generation of a more than two octave-spanning supercontinuum from 400 nm to beyond 1750 nm. A modified type of f-2f-interferometer was employed, beating the frequency doubled input signal of the fiber oscillator with the supercontinuum to generate the carrier-envelope-offset beat. Controlling the fiber oscillator's pump power with an electronic feedback loop, we phase-locked the carrier-envelope-offset frequency to an external reference source.

Complex intensity modulation transfer function for supercontinuum generation in microstructure fibers.

We investigated the complex intensity modulation transfer function for supercontinuum generation in microstructure fibers (MSF). We measured the relative intensity and phase modulations in the output spectrum of the MSF with spectral resolution of one and ten nanometers, respectively. For small intensity modulation indices (~ 1 %) we found power modulation gain factors as large as 100 in certain spectral areas of the super continuum.