Segmented cladding fibers for the middle infrared

Abstract

We report the design, fabrication and optical characterization of total internal reflection segmented-cladding fibers for the middle-infrared spectral range 2-20µm. Segmented cladding is a novel fiber design in which the uniform core of high refractive material is surrounded by a cladding of alternating segments of high and low refractive indices. Segmented cladding fibers are capable of maintaining a single-mode operation over a wide spectral range with a large core area. The design of the fibers and the simulations were made using the radial effective index method. The fibers were extruded from silver-halide crystals by using the 'rod in tube' method. Using this method we were able to construct large core fibers which exhibited few-modes and relatively low losses at 10.6µm.

Design and fabrication of SCPOF preform doped with rare earth complexes

“…[14][15][16][17][18] Under this circumstance, researches on the rare earth doped segmented-cladding polymer optical fibers (SCPOF) were started in our group based on our previous work on rare earth doped multi-mode POF. [19][20][21][22][23][24][25][26][27][28] In this work, a model for selection of suitable core and cladding polymers for SCPOF is proposed in terms of the physical principle and requirements for a preform of SCPOF.…”

Large-mode-area leaky optical fiber fabricated by MCVD

“…Recently, new single mode LMA structures were proposed, which were composed of a multimode core and a structured cladding acting as a modal filter and guiding through total internal reflection of leaky modes. The cladding structuring may be azimuthal [5,6] or radial [7]. The most relevant parameter allowing effective single mode operation is the strong discrimination between the propagation loss of the fundamental mode and any higher order mode (HOM).…”