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

US6501895B1 · kind B1 · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Peter Bloechl · Goslar, DE
• Gian-Luca Bona · Hedingen, CH
• Roland Germann · Wangen, CH
• Horst Folkert · Adliswil, CH
• Illana Massarek · Thalwil, CH
• Bert Jan Offrein · Aarau, CH
• Huub Salemink · Wetzikon, CH
• Dorothea Wiesmann · Oberrieden, CH

Key dates

• Filing date: Sep 15, 2000
• Grant date: Dec 31, 2002
• Expiry date: Sep 15, 2020

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B2006/12169
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical device with a defined total device stress (&sgr;10) 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 (&sgr;4) resulting from the manufacturing process and the upper cladding layer (5) is manufactured to have an inherent cladding layer stress (&sgr;5) which together with the waveguide core stress (&sgr;4) results in the total device stress (&sgr;10).