Abstract
A new type of mode converter using a tapered hollow silica optical fiber is proposed and experimentally demonstrated. Three segments of single mode, hollow, and multimode fibers were concatenated serially to convert the fundamental mode to a ring shape mode. The proposed scheme could be applied to convert the fundamental LP 0 1 mode to TE 0 1 , TM 0 1 and LP 0 2 modes. Evolution of mode filed along the taper and the insertion loss were measured.
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