초록 ▼

The optical device of the present invention includes a substrate, at least one first groove formed on the substrate, an optical fiber placed in the first groove, and at least one second groove diagonally formed across the optical fiber. Furthermore, the optical device includes an optical member inse

The optical device of the present invention includes a substrate, at least one first groove formed on the substrate, an optical fiber placed in the first groove, and at least one second groove diagonally formed across the optical fiber. Furthermore, the optical device includes an optical member inserted in the second groove, having a surface which reflects or diffracts at least a part of light propagating through the optical fiber. A photodetector is placed at a position where light which is reflected or diffracted by the optical member is received. As a result, an miniaturized optical device having a low loss and high reliability can be provided at low cost.

대표청구항 ▼

1. An optical device, comprising:a substrate having an upper surface; at least one first groove formed on the upper surface of the substrate; an optical fiber provided in the first groove; and at least one second groove which diagonally traverses the optical fiber and is tilted with respect to the u

1. An optical device, comprising:a substrate having an upper surface; at least one first groove formed on the upper surface of the substrate; an optical fiber provided in the first groove; and at least one second groove which diagonally traverses the optical fiber and is tilted with respect to the upper surface of the substrate, the device further including an optical member which is inserted in the second groove and has a surface reflecting or diffracting at least a part of light propagating through the optical fiber, and at least one first optical element which is provided on the upper surface of the substrate and receives light reflected or diffracted by the optical member, wherein an active surface of the first optical element opposes the upper surface of the substrate, and a material having a refractive index nr almost equal to a refractive index nf of a core portion of the optical fiber is embedded at least between the optical member and the optical fiber in the second groove, wherein the optical fiber has a first portion which functions as a single mode fiber in a wavelength band of signal light propagating through the optical fiber, a second portion which functions as a multi-mode fiber in the wavelength band of the signal light, and a connecting portion connecting the first portion to the second portion, and a core diameter of the connecting portion gradually and continuously changes from the first portion to the second portion.