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Optical waveguide element

A technology of optical waveguide and components, which is applied in the field of optical waveguide components, can solve problems such as degradation of optical characteristics, light leakage, and degradation of optical characteristics of optical modulators, and achieve the effect of improving the On/Off extinction ratio

Inactive Publication Date: 2015-04-15
SUMITOMO OSAKA CEMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, light leaks from the Y branch, causing deterioration of the optical characteristics of the optical modulator, etc.
In addition, in the case of a thinner structure with thinner substrates, the degradation of optical characteristics becomes remarkable as described above

Method used

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Embodiment Construction

[0043] Hereinafter, the optical waveguide element of the present invention will be described in detail using preferred examples.

[0044] The optical waveguide element of the present invention such as figure 2As shown, an optical waveguide is formed on the substrate, and it is characterized in that the optical waveguide has a branch angle of 1 / 35 rad or more and divides the light into two first branch parts, and the two branches branched from the first branch part The branched waveguide is respectively connected with a second branched part and a third branched part, and the optical waveguide element is arranged between the two branched waveguides branched by the first branched part, and facing from the branched part of the first branched part to the branched part. A radiation light guide waveguide for guiding radiation emitted outside the optical waveguide has an optical termination portion that absorbs the guided radiation light or emits the guided radiation light out of the...

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Abstract

The purpose of the invention is to provide an optical waveguide element with little deterioration in optical characteristics even if the branch angle is large at the Y branch part of the optical waveguide. An optical waveguide element in which an optical waveguide is formed in a substrate is characterized in that the optical waveguide includes a first branch part which branches light at a branch angle of 1 / 35 radians or more into two directions, a second branch part (not shown) and a third branch part (not shown) are connected to the two branched waveguides branching at the first branch part, a radiated light guiding waveguide that guides radiated light radiated at the fork of the first branch part toward the outside of the optical waveguide is disposed between the two branched waveguides branching at the first branch part, and an optical terminating part (electrode) that absorbs the guided radiated light or radiates the guided radiated light toward the outside of the substrate is disposed at the terminating part of the radiated light guiding waveguide.

Description

technical field [0001] The present invention relates to an optical waveguide element, and more particularly, to an optical waveguide element having improved optical characteristics even when the branch angle is large in the Y branch of the optical waveguide. Background technique [0002] In optical communication or optical information processing, an optical waveguide element in which an optical waveguide is formed on a substrate having an electro-optical effect such as lithium niobate (LN) is used. [0003] An LN modulator as an example of an optical waveguide element has a waveguide shape of a Mach-Zehnder (MZ) structure. The modulator of the MZ structure controls ON / OFF of light by applying a voltage to control electrodes arranged along the branch optical waveguides of the MZ structure. Specifically, on / off of light can be realized by fundamental mode / excitation mode control based on the case where the output waveguide of the MZ structure waveguide is a single-mode wavegu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/035G02B6/12
CPCG02F1/035G02B6/125G02F2202/20G02F2001/212G02F1/212G02F1/225G02F2201/08
Inventor 近藤胜利
Owner SUMITOMO OSAKA CEMENT CO LTD
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