Abstract
Single-mode (SM) fibers for the middle infrared (3–20 μm) are required for a variety of purposes, such as spatial filtering and interferometry. There has
only been limited success in the development of such fibers, due to the lack of suitable materials that transmit in
this spectral range. In this paper, we report the design and fabrication of SM segmented cladding fibers made of
silver halide materials. The fiber design consists of a uniform core of high-refractive material that is surrounded
by a cladding of alternating segments of high and low refractive indices. These fibers can maintain a SM operation
over a wide spectral range with a very large core area.
© 2007 IEEE
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