Patent ID: 11955777
Assignee: FUJIKURA LTD.
Field: Optics (Instruments)
Classification: CPC H  B  G | IPC B  G  H

Claim 1:
2. The optical combiner as recited in claim 1, wherein
the output optical fiber further includes:
a center core;
an inner cladding with a refractive index lower than a refractive index of the center core and that surrounds an outer circumference of the center core;
a ring core with a refractive index higher than the refractive index of the inner cladding and that surrounds an outer circumference of the inner cladding; and
a low-refractive-index medium with a refractive index lower than the refractive index of the ring core and that surrounds an outer circumference of the ring core,

the center core forms the first optical waveguide, and
the ring core forms the second optical waveguide.