Optically induced mode conversion in graded-index fibers using ultra-short laser pulses
Abstract
We propose the use of graded-index few-mode fibers for mode-conversion by long-period gratings (LPG) transiently written by ultrashort laser pulses using the optical Kerr effect. The mode inter- action is studied by numerically solving the multi-mode coupled nonlinear Schroedinger equations. We present highly efficient conversion of the LP 01 - into the LP 11 -mode preserving the pulse shape in contrast to previous results in step-index fibers. Furthermore, mode conversion using different wavelengths for inducing and probing the LPG is shown. Due to the flat phase-matching curve of the examined modes in the graded-index fiber, mode-conversion can be observed for probe center wavelengths of 1100nm up to 1800nm with a write beam centered around 1030nm. Therefore, a complete separation of the probe from the write beam should be possible as well as the application of optically induced guided mode conversion for all optical modulation across a broad wavelength range.
Keywords
Cite
@article{arxiv.1307.4268,
title = {Optically induced mode conversion in graded-index fibers using ultra-short laser pulses},
author = {Tim Hellwig and Till Walbaum and Carsten Fallnich},
journal= {arXiv preprint arXiv:1307.4268},
year = {2014}
}
Comments
The final publication is available at http://link.springer.com. Appl. Phys. B, 2013