Optical device with a defined total device stress and method for manufacturing it

摘要

An optical device with a defined total device stress (sigma10) and a therefrom resulting defined birefringence in order to obtain a well defined optical polarization dependence is proposed. It comprises a lower cladding layer (3) with a first refractive index (n3), thereon an upper cladding layer (5) with a second refractive index (n5) and between an optical waveguide core (4) with a third refractive index (n4) which is bigger than the first refractive index (n3) and the second refractive index (n5). The optical waveguide core (4) has a waveguide core stress (sigma4) resulting from the manufacturing process and the upper cladding layer (5) is manufactured to have an inherent cladding layer stress (sigma5) which together with the waveguide core stress (sigma4) results in the total device stress (sigma10).