Plessey Handel Und Investments A.g.

Alan Hugh Kent

Peter Howard Fell

Geoffrey Frank Hennell

George Hedley Rokos

For coupling the end of an optical fibre or other linear optical waveguide element to a small-area receiving surface (e.g. surface of photodetector diode) in such manner as to ensure that the fibre makes contact with the surface at right angles to and substantially centrally to the surface, the receiving surface is centrally arranged at the end of a cylindrical boss, and the end of the fibre or like element is supported in a coupling member comprising a body having an end portion in which the end of the element is centered and of which at least the end portion which in the coupled position is nearest to the receiving surface is enclosed in a cylindrical holder tube which extends beyond the end of the end portion to form a collar adapted to encircle the boss and providing a cylindrical bore for sliding co-operation with the cylindrical outer surface of the boss.

Connectors for coaxially coupling the end of a linear optical waveguide

The adjacent ends of two waveguide elements are coupled in mutual alignment by being slid into a suitably dimensioned through bore of a coupling block from the two flared ends of the bore respectively, preferably in the presence of a small quantity of a liquid having a refractory index similar to that of the waveguide elements and preferably also having adhesive qualities to retain the waveguide elements in their mutually abutting coupled position in the block. The coupling block is preferably formed by casting, using a low-shrinkage resin such as epoxy resin in a mould whose end walls have aligned bores for a stainless steel wire which extends through the mould cavity to form the through bore of the block, this wire being withdrawn after setting of the resin. Preferably tapered core portions through which the bores extend coaxially, are provided in the mould and withdrawable endwise to permit removal of the cast block from the mould cavity.

In-line coupling of two lengths of linear optical waveguide elements

A system for the transmission of television signals comprising a light emitter diode or diodes feeding an optical transmission line, the light output from the optical transmission line being applied to light sensitive semiconductor devices for re-conversion to analogue television signals.

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Wokingham, United Kingdom

Alan Hugh Kent