Importance

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Abstract

Provided is an optical propagation device including an optical fiber having a core and a clad having a lower refractive index than a refractive index of the core, wherein the optical fiber is any of a step index multimode optical fiber or a few-mode optical fiber, an optical signal propagates in at least two or more multiple modes in the core of the optical fiber, the optical fiber is bent such that tensile force generated by bending is discontinuously applied to two or more locations of the optical fiber across a length direction of the optical fiber, and at each bent portion of the optical fiber, stress is non-uniformly generated across an outer peripheral direction of the optical fiber.

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First Claim