OPTICAL FIBER THAT COMBINES AND DEMULTIPLEXES LIGHT
The present disclosure is an optical multiplexing/demultiplexing fiber having a core uniformly and continuously extending in a propagation direction; the fiber includes an optical waveguide for optically connecting one end face of the optical fiber and a side face of the core, in which an end part of the optical waveguide, on the side face side of the core, is coupled to the core.
1 . An optical multiplexing/demultiplexing fiber having a core in a cladding, comprising:
an optical waveguide, for optically connecting one end face of the optical fiber and a side face of the core, in the cladding,
wherein an end part of the optical waveguide, on the side face side of the core, is coupled to the core.
2 . The optical multiplexing/demultiplexing fiber according to claim 1 , wherein the end part of the optical waveguide, on the side face side of the core, is oblique to the core.
3 . The optical multiplexing/demultiplexing fiber according to claim 2 , further comprising:
a long period fiber grating (LPG) positioned at a coupling part of the core to the optical waveguide,
wherein light having a wavelength or mode determined by the LPG is coupled to the optical waveguide.
4 . The optical multiplexing/demultiplexing fiber according to claim 3 , wherein an angle of the oblique and a configuration of the optical waveguide are determined depending on each component of the light to be coupled between the core and the optical waveguide and a light intensity of each component of the light.
5 . The optical multiplexing/demultiplexing fiber according to claim 1 , wherein the end part of the optical waveguide, on the side face side of the core, is a directional coupler arranged in parallel with the core.
6 . The optical multiplexing/demultiplexing fiber according to claim 5 , wherein a coupling length of the directional coupler and a configuration of the optical waveguide are determined depending on each component of light to be coupled between the core and the optical waveguide and a light intensity of each component of the light.
7 . The optical multiplexing/demultiplexing fiber according to claim 3 , wherein the LPG is controllable by using a pressure applied thereto from an outer periphery of the cladding.
8 . An optical multiplexing/branching device comprising:
the optical multiplexing/demultiplexing fiber according to claim 1 ; and
a multi-core fiber disposed on the one end face of the optical multiplexing/demultiplexing fiber,
wherein at least one core included in the multi-core fiber is connected to the optical waveguide included in the optical multiplexing/demultiplexing fiber.