H - Electricity – 01 – S
Patent
H - Electricity
01
S
345/12, 345/33
H01S 3/06 (2006.01)
Patent
CA 1334306
An optical fibre for use in fibre lasers has the lasing additive, eg Er3+, concentrated in centre of the core. Preferably the core has an inner region which contains the additive and an outer region which is dopant free. The concentration of the dopant reduces the pump threshold for a laser and improves the gain performance for a given pump power. The fibre is conveniently made by MCVD. The use of Al2O3 in the inner zone appears to reduce loss of dopant during tube collapse.
616670
Ainslie Benjamin James
Armitage Jonathan Richard
Craig Susan Patricia
British Telecommunications Public Limited Company
Shapiro Cohen
LandOfFree
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