Coupling device between a glass fibre (optical fibre) and a dielectric waveguide integrated on a substrate

摘要

The invention relates to a coupling device between a glass fibre (1) and a dielectric waveguide (22) integrated on the substrate (2). The object of the invention, to develop a low-loss and low-back-scatter, but cost-effective coupling device, is achieved in that the fibre end (11, 12) - mainly by pulling the fibre under the influence of heat up to the point of rupture - is reduced down to a diameter in the order of magnitude of typical core dimensions of dielectric waveguides and in that, on the other hand, there is provided on the substrate a fibre holder (21) which tapers off in a similar manner (shape) and whose tip merges into the waveguide to be coupled. In this way it is achieved that during assembly the glass fibre has only to be slipped into the holder up to the stop and during this process automatically centres itself in the direction of the waveguide without it being possible that tolerances in the fibre geometry might lead to an increase in loss as is the case in butt joints (end face coupling) - the prior art. <IMAGE>