Optical waveguide with low attenuation - provided by barrier layer between cladding tube and optically active region

摘要

In an optical waveguide with a cladding tube region (4), cladding layers (3) and a core (2), the novelty is that a barrier region (5) is provided to prevent transfer of the attenuation-increasing properties of the cladding tube region to the optically active region. Pref. the barrier region is a glass or doped SiO2 layer between the cladding tube region and the cladding layers. ADVANTAGE - The waveguide has extremely low attenuation.