Optical combiner and laser device using the same

摘要

An optical combiner includes a plurality of input optical fibers, an output optical fiber, and a bridge fiber optically coupled to the plurality of input optical fibers and the output optical fiber. The bridge fiber includes a tapered portion whose outer diameter is reduced toward the emission end, and the outer diameter of the emission end face of the bridge fiber is smaller than the cladding outer diameter of the incident end face of the output optical fiber.

主权项

1. An optical combiner comprising:
a plurality of input optical fibers; an output optical fiber; and a bridge fiber disposed between the plurality of input optical fibers and the output optical fiber and optically coupled to the plurality of input optical fibers and the output optical fiber, wherein the bridge fiber includes an input end face coupled to the plurality of input optical fibers, and an emission end face opposite to the input end face and coupled to the output optical fiber, the bridge fiber includes a tapered portion whose outer diameter is reduced toward the emission end face of the bridge fiber, the output optical fiber includes an incident end face connected to the emission end face of the bridge fiber, and an outer diameter of the emission end face of the bridge fiber is smaller than a cladding outer diameter of the incident end face of the output optical fiber such that the boundary between the bridge fiber and the output optical fiber includes a step projecting radially, wherein the bridge fiber includes a plurality of bridge fibers optically coupled to each other, the plurality of bridge fibers including a first bridge fiber and a second bridge fiber disposed next to each other in an axial direction of the bridge fiber, the first bridge fiber includes a first input end face coupled to the plurality of input optical fibers, and a first emission end face opposite to the first input end face, the second bridge fiber includes a second input end face coupled to the first emission end face of the first bridge fiber, and a second emission end face opposite to the second input end face and coupled to the output optical fiber, and an outer diameter of the second input end face of the second bridge fiber is larger than an outer diameter of the first emission end face of the first bridge fiber such that the boundary between the first bridge fiber and the second bridge fiber includes a step projecting radially.