Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1998-12-29
2000-12-26
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
H01S 300
Patent
active
061668516
ABSTRACT:
A construction of gain tilt exhibiting optical amplifier that incorporates a gain flattening filter also includes a neutral density filter the value of whose attenuation is adjustable after assembly of the components of the amplifier. This neutral density filter is constructed by the performance of a succession of localised re-fusion operations at a localised region of an optical fiber. By this means the attenuation is increased to a desired value that provides the amplifier with optimised gain flattening at some predetermined value of amplifier external gain.
REFERENCES:
patent: 5708740 (1998-01-01), Cullen
patent: 5959766 (1999-09-01), Otterbach et al.
patent: 5963361 (1999-10-01), Taylor et al.
Hashimoto et al, Variable Optical Fiber Attenuators, IEEE, pp. 1151-1152, 1999.
Andrews Stephen
Flintham Barrie
Jones Kevan Peter
Hellner Mark
Nortel Networks Limited
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