One of the critical issues for nulling interferometry breadboards for exo-earth detection relies on the possibility
to manufacture and properly characterize optical waveguides that present suitable single mode behaviors in the
foreseen spectral range (4-20 μm). We developed a dedicated bench for the characterization of available guides
for the considered spectral range, in particulary silver halide fibers. This interferometric bench achieves modal
characterization in nulling mode and spectral transmission in Fourier Transform spectrometer mode, defining
the single mode domain of the components. We present the experimental setup and its performances. We
present also some characterization of their single-mode behavior according to the injection conditions. These
measurements are very useful for the conception of optimized components.© (2008) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.