Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1996-08-01
1997-09-30
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359177, H01S 300, H04B 1002
Patent
active
056731426
ABSTRACT:
An optical monitor tap in fiber optical amplifiers is achieved in a configuration with internal input signal monitoring taps, in accordance with the principles of the invention, by placing the tap some distance into the actual optical amplifier active fiber. This allows the system to minor the integrity of the amplifier without impairing the quality of the associated signal. In an illustrative embodiment of the present invention, the amplifier is generally comprised of a long piece of rare-earth material doped fiber to which a fiber optic pump source is coupled via a wavelength divisional multiplexer (WDM) coupler. The tap is placed at some distance from the input of the fiber amplifier. The distance should be small enough such that there has been amplification of the signal but not so much as to have the signal saturated or compressed.
REFERENCES:
patent: 5355248 (1994-10-01), Hadjifotiou
patent: 5455704 (1995-10-01), Mizuochi et al.
patent: 5471334 (1995-11-01), Masuda et al.
patent: 5500756 (1996-03-01), Tsushima et al.
patent: 5528404 (1996-06-01), MacKichan
patent: 5563733 (1996-10-01), Mitsuda et al.
Fatehi Mohammad T.
Izadpanah Hossein
Hellner Mark
Lucent Technologies - Inc.
Stafford Thomas
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