British Telecommunications Public Limited Company

British Telecommunications Public Limited Company, a Corporation of England

Robert M Percival

Richard Wyatt

Raman Kashyap

Steven T Davey

Daryl Szebesta

A section of tapered optical fiber is provided to protect optical components from catastrophic damage that may propagate within an optical route. The tapered section functions as a fuse to arrest the propagation of optical power induced damage by leaking optical power from a waveguiding region below a threshold, below which further propagation of damage is not supported.

Optical communications system and method of protecting an optical route

A thulium doped silica based glass capable of supporting lasing activity including Tm as a lasing species disposed in a host composition, including oxides of germanium, silicon and tantalum. The preferred concentration of silicon in the host composition being between 15-25 weight percent. The preferred concentration of germanium in the host composition being between 0.1-1 weight percent. The preferred concentration of tantalum in the host composition is greater than 15 weight percent. The preferred concentration of thulium ions being in the range of 500-1000 parts per million by weight.

Silica glass composition with lasing properties, an optical waveguide and a method of amplifying optical signals

Optical amplifier and laser

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Ipswich, United Kingdom

Robert M Percival