Optical waveguides – Optical fiber waveguide with cladding – Utilizing multiple core or cladding
Patent
1992-05-06
1998-11-03
Healy, Brian
Optical waveguides
Optical fiber waveguide with cladding
Utilizing multiple core or cladding
385123, 385126, 385142, 359341, 359343, 359345, 372 6, 372 40, 372 42, G02B 602, H01S 300, H01S 330
Patent
active
RE0359467
ABSTRACT:
An optical fibre for use in fibre lasers has the lasing additive eg Er.sup.3+, concentrated in center 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 in MCVD. The use of Al.sub.2 O.sub.3 in the inner zone appears to reduce loss of dopant during tube collapse.
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Ainslie Benjamin J.
Armitage Jonathan R.
Craig Susan P.
British Telecommunications PLC
Healy Brian
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