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We investigate a few-mode multicore fiber structure suitable for realizing a high spatial density while maintaining a feasible cladding diameter. First, we discuss the impact of cladding diameter on mechanical reliability, and set a target cladding diameter of less than 250 μm to maintain a comparable reliability to conventional fiber. We then optimize the 6-mode core profile to obtain a low differential...
We experimentally investigate the mode excitation ratio of a two-mode fiber (TMF) based on the bending method. TMFs with three different kinds of mode excitation ratio of LP11 mode to LP01 are prepared and successfully measured by our present method.
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