Optical: systems and elements – Optical amplifier – Optical fiber
Patent
1994-03-24
1996-05-28
Hellner, Mark
Optical: systems and elements
Optical amplifier
Optical fiber
359177, H04B 1008
Patent
active
055217524
ABSTRACT:
The input light in fiber-optic amplifiers is monitored in order to turn off the system in which it is contained, or individual components of the system, e.g. the fiber-optic amplifier itself, when input light is lacking. To that effect, in known fiber-optic amplifiers, a portion of the input light is coupled out by a coupler. However, this coupler has disadvantages; e.g. the signal-to-noise ratio deteriorates. To monitor the input light, the fiber-optic amplifier of the present invention uses a device (4), which couples out and evaluates the pump light that was not absorbed by the section of the optical waveguide (2).
REFERENCES:
patent: 5285306 (1994-02-01), Heidemann
patent: 5299048 (1994-03-01), Sugama
patent: 5363385 (1994-11-01), Heidemmann
patent: 5374973 (1994-12-01), Maxham et al.
"32 Channel, 48 dB CNR and 46 dB budget AM-VSB transmission experiment with field-ready post-amplifiers" in Optical Amplifiers and Their Applications, 1992 Technical Digest (Optical Society of America WAshington, DC 1992) vol. 17 91-94 B. Clesca, et al.
"Optical Communications Technology", second issue, Berlin, Heidelberg, New York, Tokyo, Springer PUblishers, pp. 296-302 by G. Grau.
Heidemann Rolf
Junginger Bernhard
ALCATEL N.V.
Hellner Mark
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