Optical waveguide element, and optical modulation device and optical transmission device using same

Abstract

The invention provides an optical waveguide element, and an optical modulation device and an optical transmission device using the same. The optical waveguide element reduces internal stress generated at a joint of a substrate, a reinforcing block, and an optical block. This optical waveguide element is provided with: a substrate (1) on which an optical waveguide is formed; and a reinforcing block (10) disposed on the substrate along an end surface of the substrate on which the input section or the output section of the optical waveguide is disposed, characterized in that the optical waveguide element has an optical member (3) joined to the end surface of the substrate and an end surface of the reinforcing block, a material used for at least the surface (A) of the optical member to be joined and a material used for the substrate or the reinforcing block have different linear expansion coefficients in a direction parallel to the surface to be joined, and the area of the surface where the bonding is performed is set to be smaller than the maximum value of the total area of the substrate and the reinforcing block with respect to the area of the cross section of the substrate and the reinforcing block parallel to the surface where the bonding is performed.

Description

technical field [0001] The present invention relates to an optical waveguide element, an optical modulation device using the optical waveguide element, and an optical transmission device, and particularly relates to a substrate provided with an optical waveguide and an end surface along which an input portion or an output portion of the optical waveguide is arranged along the substrate. The optical waveguide element of the reinforcing block arranged on the substrate. Background technique [0002] In the field of optical measurement technology and the field of optical communication technology, an optical waveguide element using a substrate on which an optical waveguide is formed, such as an optical modulator, is often used. On an optical waveguide element using a substrate having an electro-optic effect such as lithium niobate (LN), a control electrode for controlling the light wave propagating in the optical waveguide is formed to form an optical modulation element (LN chip)...

AI Technical Summary

Problems solved by technology

When the generated stress is large, or when fatigue deterioration occurs on the joint surface due to stress changes caused by repeated temperature changes, the optical components held in the optical block deviate from the optimal position, and the loss increases. In the worst case In this case, there are disadvantages such as the optical block falling off from the end face of the optical waveguide element

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