International Standard Electric Corporation

Standard Telephones and Cables Public Limited Company

Standard Telephones Cables Public Limited Company

George R Antell

Roger E Jones

Gilles D Pitt

Lyndon R Spicer

John A Barnett

Robert Hill

Power transmission to a remote consuming device, especially for underseas applications including towed arrays, static arrays, submersible links to submersible vehicles, or surveillance devices, links to divers, and dunking sonars, uses on the transmission medium an optical fibre. This fibre has a thickness in the range 150-300 um, i.e. it is of the so-called fat type, and is a long wavelength fibre for conveying light whose wavelength is in the range of 0.7 to 1.7 um. The light source uses lasers or super-luminescent diodes, a preferred light source being an array of individual laser diodes which are pulsed and/or cooled to improve power handling capacity. These diodes each feed optical energy into a short length of optical fibre and these fibres are coupled via an optical coupler into the main transmitting fibre. At the receiving end another optical coupler feeds via individual fibres an array of detectors each of which is preferably a photo-voltaic cell formed of layers of suitable doped indium phosphide and indium gallium arsenide. Each such cell has its own output electrodes and these cells are connectable in series, parallel or series/parallel dependent on the desired output.

Method and arrangement for transmitting power in optical form over

A structure of photodetector in which the active region is formed by creating a p-n junction (6) extending in a layer (3) of material of small band gap (InGaAs) in such a way that it emerges in material (InP) of a larger band gap (2) at the surface of the semiconductive body.

Photodetector

A fibre optic switch is constructed by having two flat springs each of which carries optical fibres which end at one edge of the spring. The two spring ends are close to each other and at 90.degree., so that by suitable positioning of the springs any fibre on one spring can be coupled to any fibre on the other spring.

Fiber optic switch

Growing community of inventors

Saffron Walden, United Kingdom

George R Antell