Optical coupling device

The optical coupling device for injecting light between two optical waveguide end faces, the geometric position of one optical waveguide end face, for example of an optical fibre, being capable of being varied with respect to the other optical waveguide end face, for example of an optical waveguide chip, with the aid of a variable-length element, said coupling device comprising:

• a variable-length element which carries one of the two optical waveguides via a holding element and is fixed to the other optical waveguide by means of at least one holding block, wherein the holding block has a U-shaped part made of a material with the same coefficient of thermal expansion as the other optical waveguide, and further in that a T-shape part made of a material with the same coefficient of thermal expansion as the other optical waveguide is provided, wherein further that the variable-length element with the positive coefficient of thermal expansion is connected to the T-shaped part at its foot and to the U-shaped part at its base, and wherein further in that two variable-length elements with a positive coefficient of thermal expansion are fixed to the legs of the U-shaped part, which consist of the same material as the variable-length element and have the same length as the latter and which, on one side, are fixed to the legs of the U-shaped part and, on the other side, to the underside of the crossbar of the T-shaped part.