Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
1999-01-02
2001-06-26
Moskowitz, Nelson (Department: 3662)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S199200, C359S341430
Reexamination Certificate
active
06252699
ABSTRACT:
PRIOR ART
The invention relates to the species as recited in independent claim
1
. At least in connection with erbium-doped fiber amplifications in multi-channel systems, the dependency of the amplification from the output of the optical input signals can result in that changes in the output of the optical input signal of one channel affect the amplification of the fiber amplifier regarding the optical channels of another channel. A stabilization of the amplification allows a simpler adaptation of a fiber amplifier to various situations.
A method for stabilizing the amplification is disclosed in ELECTRONIC LETTERS, Vol. 30, No. 12, pages 962 to 963, wherein the amplification is maintained by a resonator, which prefers a defined wave length. Other methods, which deal with dynamic or automatic amplification regulation, are also mentioned there.
ADVANTAGES OF THE INVENTION
The subject of the application with the characteristics of claim
1
has the following advantage: in a simple manner it makes it possible to maintain the amplification approximately constant. The amplification can be varied within defined limits; in this way it is possible to adapt the fiber amplifier to different system requirements.
REFERENCES:
patent: 5485299 (1996-01-01), Jones
patent: 5500756 (1996-03-01), Tsushima et al.
patent: 8289586 (1995-11-01), None
patent: 7015055 (1995-01-01), None
patent: 777346 (1997-06-01), None
Kohn, U.; Elektronik Prexis, vol. 28, #9, pp. 44-46, May 6, 1993.*
Murahami et al, Jour. of Lightwave Techn., vol. 14, pp. 671-677.*
Electronic Letter, vol. 30, No. 12, pp. 962-963.
Moskowitz Nelson
Robert & Bosch GmbH
Striker Michael J.
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