British Telecommunications Corporation

E.i. Dupont De Nemours and Company

British Telecommunications Public Limited Company

Brian M MacDonald

Stephen P Rogerson

David R Smith

Michael J Hodgson

Kathleen S Abbott

Christopher J Stanghan

Ian M Connell

An optical fiber feedthrough comprising a glass seal for sealing the optical fiber within a metal sleeve. The fiber is held in a fixed position with respect to the sleeve while a glass solder, preferably an annular preform, is heated to its glass transition temperature and then cooled to form a glass to metal seal.

Optical fiber feedthrough

A method of mounting a saw device comprising applying metallized areas to the surface of an appropriate substrate, attaching conductive leads to the metallized areas, locating the said surface adjacent a selected area of another substrate so that said leads contact conductive regions on the second substrate and attaching said leads to said conductive regions on the second substrate so that the first substrate is supported on the leads and the conductive regions.

Method of mounting saw devices

Optical fibre termination

A SAW device is formed by applying metallized areas (11) to a surface of a SAW substrate (10) and attaching conductive leads (18) to the metallized areas. The substrate is inverted and located on a hybrid circuit so that the leads (18) contact and are supported on conductive areas (30) of the circuit. This mounting arrangement minimizes the stresses which occur in the substrate in its operational life. A novel shape for the device is also disclosed.

Mounting of saw devices

Growing community of inventors

Felixstowe, United Kingdom

Brian M MacDonald