Patent ID: 7899287
Filing Date: 2011-03-01
Classification: G02B

Abstract:
1. A method of producing an optical branching-coupling device, the optical branching-coupling device including a housing having a region configured to form optical waveguide cores and cladding, first, second, and third optical input-output ports formed on a sidewall of the housing, a first optical waveguide having a straight optical axis connecting the first optical input-output port and the second optical input-output port, and a second optical waveguide having a straight optical axis directly connected to the first optical waveguide and connecting the first optical waveguide and the third optical input-output port, an angle between the straight optical axes of the first optical waveguide and the second optical waveguide being in a range from 10° to 30°, the method comprising: disposing an edge of cores of a first optical fiber at the first optical input-output port; disposing an edge of cores of a second optical fiber at the third optical input-output port; disposing an uncured core liquid light-curing resin in the region of the housing; forming a core of the first optical waveguide by radiating curing light of a wavelength capable of curing the uncured core liquid light-curing resin from the first optical input-output port to the second optical input-output port by the first optical fiber; forming a core of the second optical waveguide after the forming of the core of the first optical waveguide so as to be directly connected with the core of the first optical waveguide by radiating curing light of a wavelength capable of curing the uncured core liquid light-curing resin from the third optical input-output port by the second optical fiber, at an angle in a range from 10° to 30° relative to the optical axis of the first optical waveguide; and forming the cladding by curing cladding curing resin to surround the cores of the first and second optical waveguides, the cladding curing resin having a refractive index that is less than a refractive index of the core liquid light-curing resin.