British Telecommunications Public Limited Company

British Telecommunications Corporation

Michael Charles Brierley

Colin A Millar

Stephen R Mallinson

Timothy J Whitley

Richard Wyatt

Michael J Robertson

Jonathan R Armitage

Douglas L Williams

Roger Alyn Payne

Howard John Wickes

Michael H Hunt

Robert John Campbell

Gerard Sherlock

William P Urquhart

Laser

A laser has a resonant cavity defined by a pair of mirrors (6, 10) butted to respective ends of a 3 m fluorozirconate optical fibre (14). The fibre (14) has a .DELTA.n of 0.014 and a cut-off wavelength of around 790 nm and is doped to about 500 ppm (weight) with erbium ions. An optical pump source (12) provides a pump signal at 971 nm which excites the erbium ions into the .sup.4 S.sub.3/2 energy level to provide lasing at about 546 nm. The laser may alternatively be pumped by a pump signal in the band 791 nm to 812 nm, preferably 801 nm. The pump source is preferably a high power semiconductor laser (16).

Optical amplifier and laser

Laser and an amplifier

A laser has a resonant cavity defined by a pair of mirrors (6, 10) butted to respective ends of a 3 m fluorozirconate optical fibre (14). The fibre (14) has a .DELTA.n of 0.014 and a cut-off wavelength of around 790 nm and is doped to about 500 ppm (weight) with erbium ions. An optical pump source (12 ) provides a pump signal at 971 nm which excites the erbium ions into the .sup.4 S.sub.3/2 energy level to provide lasing at about 546 nm. The laser may alternatively be pumped by a pump signal in the band 791 nm to 812 nm, preferably 801 nm. The pump source is preferably a high power semiconductor laser (16).

Pumped CW laser with low dopant level laser medium

Optical coupler

Dielectric optical Fabry-Perot waveguide device and method for making

Growing community of inventors

Ipswich, United Kingdom

Michael Charles Brierley