Optical fiber side input and output device

An optical fiber lateral input and output apparatus comprising:

• a first jig including:
• a recess curved in a longitudinal direction of a coated optical fiber, and
• an optical input and output device configured to make light to be incident on the coated optical fiber in which a bend is formed and to receive light leaking from the coated optical fiber;
• a second jig including:
• a protrusion curved in the longitudinal direction of the coated optical fiber, the protrusion being configured to clamp the coated optical fiber with the recess of the first jig;
• and
• a guide groove formed in a curved surface of the protrusion, the coated optical fiber being guided into the guide groove;
• a presser configured to apply a pressing force in a pressing direction in which the recess of the first jig and the protrusion of the second jig approach each other and to form the bend in the coated optical fiber;
• and
• first and second fiber guides disposed at opposite ends of the recess of the first jig in the longitudinal direction of the coated optical fiber, respectively, and configured to guide the coated optical fiber on a predetermined path on the recess of the first jig regardless of a diameter of the coated optical fiber when the presser forms the bend in the coated optical fiber, each of the first and second fiber guides has another groove,
• wherein a first width of the guide groove is smaller than each of second and third widths of the guide groove, and
• the first width is located at a tip area of the protrusion of the second jig, and the second and third widths are located at opposite ends of the guide groove, respectively, and
• a fourth width of the another groove at an opening of the another groove is larger than each of the second and third widths.