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Selective excitation of the LP_(11) mode in step index fiber using a phase mask

机译：Selective excitation of the LP_(11) mode in step index fiber using a phase mask

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摘要

We present a novel mode selective coupling technique for step index fiber. This technique utilizes phase matching for excitation of higher-order modes while suppressing the fundamental mode. Using this technique, a phase element is fabricated and tested to demonstrate the high coupling efficiency to the LP_(11) mode. In addition, we derive an analytical expression of the coupling efficiency of the LP_(11) using a single phase element.

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