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Patent

Forked optical light guide branch mfr. - by glow discharge butt welding of reduced branch cross=section

TLDR
In this paper, the end faces of the optical light guides are reduced by etching, followed by grinding a flat at an angle of 5 degrees so that they fit stepless to the incoming optical light guide.
Abstract
Forked branches of optical light guides are produced by welding by reducing the end faces of the branch fibres through a ground inclined flat. The remaining end faces are butt-joined to the end face of the trunk fibre where they are fixed to each other in a T-joint. The ends of the branch lines of the optical light guides are reduced in dia. by etching, followed by grinding a flat at an angle of 5 degrees so that they fit stepless to the end face of the incoming optical light guide. The reduction of the end face areas of the branches causes a stepless fusion of the fibres, particularly if a welding method based on a glow discharge gap is used.

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Patent

Glass fibre attenuation test rig - with light sources of different wavelength coupled by branch junctions to test fibre

TL;DR: The attenuation of glass fibres which are uses as optical light guides is measured at various wavelengths by coupling the test specimen with a receiver at the for end to an emitter casing as mentioned in this paper.
Patent

Directional coupler for optical fibre - has curved outer surface at join with ground window sections in cores of different diameter

TL;DR: In this article, a directional coupler for a light conductor, which has curved sections in the coupling zones is used in optical communication networks for signal distribution, and the geometrical parameters are biased so as to achieve reproducible coupling factors over a wide range.
Patent

Mfg. system for fibre optic coupler - uses block split into two halves with optical conductors in grooves, subsequently attached to plate

TL;DR: The coupler of as mentioned in this paper uses a pair of single fibre optical conductors with curved sections in the coupling zone, mounted next to one another in a block, with their centres of curvature aligned.
Patent

Process for polishing an optical fibre, use in the realisation of optical coupling devices

TL;DR: In this paper, a process for the abrasion of an optical fiber (5 or 48 or 50 or 50a) comprising a core (43) and a sheath (44), with a view to at least partially stripping the core of the fibre is described.