We report the observation of all-optical polarization pulling of an initially polarization-scrambled signal using parametric amplification in a highly nonlinear optical fiber. Broadband polarization pulling has been achieved both for the signal and idler waves with up to 25 dB gain using the strong polarization sensitivity of parametric amplifiers. We further derive the probability distribution function for the final polarization state, assuming a randomly polarized initial state, and we show that it agrees well with the experiments.
SBS Mitigation in a Microstructured Optical Fiber by Periodically
Varying the Core Diameter
Birgit Stiller,
Alexandre Kudlinski,
Min Won Lee,
Geraud Bouwmans,
Michael Delque,
Jean-Charles Beugnot,
Herve Maillotte,
Thibaut Sylvestre
In this letter, we experimentally demonstrate a 4-dB increase of the<br> stimulated Brillouin scattering threshold in a microstructured optical<br> fiber. This result is obtained by periodically varying the size of the<br> air-hole structure by only 7% amplitude, while keeping a low attenuation<br> coefficient. The efficiency of this passive technique is verified by use<br> of the Brillouin echoes-distributed sensing technique where the<br> Brillouin frequency-shift oscillation is clearly observed.
Black-light continuum generation in a silica-core photonic crystal fiber
T. Sylvestre,
A. R. Ragueh,
M. W. Lee,
Birgit Stiller,
G. Fanjoux,
B. Barviau,
A. Mussot,
A. Kudlinski
We report the observation of a broadband continuum spanning from 350 to 470 nm in the black-light region of the electromagnetic spectrum as a result of picosecond pumping a solid-core silica photonic crystal fiber at 355 nm. This was achieved despite strong absorption and a large normal dispersion of silica glass in the UV. Further investigations reveal that the continuum generation results from the interplay of intermodally phase-matched four-wave mixing and cascaded Raman scattering. We also discuss the main limitations in terms of bandwidth and power due to temporal walk-off, fiber absorption, and the photo darkening effect, and we suggest simple solutions.
In this letter, we experimentally demonstrate Brillouin echoes-based<br> distributed optical fiber sensing with centimeter spatial resolution. It<br> is based on a differential phase-shift-keying technique using a single<br> Mach-Zehnder modulator to generate a pump pulse and a pi-phase-shifted<br> pulse with an easy and accurate adjustment of delay. The results are<br> compared to those obtained in standard Brillouin echo-distributed<br> sensing system with two optical modulators and clearly show a resolution<br> of 5 cm in a spliced segment between two fibers by applying a<br> pi-phase-shifted pulse of 500 ps.
Contact
Research Group Birgit Stiller
Max Planck Institute for the Science of Light Staudtstr. 2 91058 Erlangen, Germany
