Patent ID: 9435943
Filing Date: 2016-09-06
CPC Classification: G02B

Claim Text:
1. An optical device comprising: a plurality of cores each including an inner core and an outer core surrounding an outer circumferential surface of the inner core, the outer core having a refractive index lower than a refractive index of the inner core; and a cladding surrounding the outer circumferential surface of the core and having a refractive index lower than the refractive index of the outer core, wherein: the optical device includes a tapered portion in which the each core is tapered in diameter from a first end to a second end of the core in a longitudinal direction and a pitch between the cores adjacent to each other is decreased; when light propagates through the core tapered in diameter, a bending loss of an LP are satisfied, where a radius of the inner core before tapered in diameter is defined as r