Patent ID: 11886012
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An optical fiber lateral input/output device comprising:
a first jig including:
a recess portion that is continuously curved in a longitudinal direction of an optical fiber core wire, a curvature radius of a bottom area of the recess portion being defined as R1, a central angle of the recess portion being defined as θ1; and
an optical input-output component for causing light to be incident on the optical fiber core wire that is bent and receiving light leaked from the optical fiber core wire;

a second jig including:
a projection portion that is continuously curved in the longitudinal direction of the optical fiber core wire and is configured to clamp the optical fiber core wire with the recess portion of the first jig, a curvature radius of a tip area of the projection portion being defined as R2, a central angle of the projection portion being defined as θ2; and
a guide groove that is formed in a curved surface of the projection portion, the optical fiber core wire being fitted into the guide groove; and

a pressing unit configured to apply a pressing force toward the optical fiber core wire in a first direction in which the recess portion of the first jig and the projection portion of the second jig approach each other so as to bend the optical fiber core wire,
wherein R2≤R1 and θ2≤θ1 are satisfied,

the pressing force has a first value and a second value, and the second value is smaller than the first value,
when a distance S between the lowest point of the recess portion and the highest point of the projection portion is equal to or larger than a reference distance S′, the pressing force having the first value is applied toward the optical fiber core wire,
when the distance S is smaller than the reference distance S′, the pressing force having the second value is applied toward the optical fiber core wire, and
the pressing force having the second value is generated by an elastic member, and the elastic member is configured to apply a reverse pressing force toward the second jig in a second direction which is opposite to the first direction.