Optics: measuring and testing – For optical fiber or waveguide inspection
Reexamination Certificate
2006-05-02
2006-05-02
Nguyen, Tu T. (Department: 2877)
Optics: measuring and testing
For optical fiber or waveguide inspection
Reexamination Certificate
active
07038769
ABSTRACT:
A monitoring method is realized which is capable of detecting the optical power characteristic of a pumping light source with high accuracy at the operation time of an optical amplifier, wherein the optical amplifier is capable of performing a pumping light control without affecting a signal light in the operation even when the number of signal light wavelengths is abruptly changed. To this end, a drive signal for the pumping light source is modulated at a frequency higher than a cut-off frequency of an EDF, and the power of a pumping light output form the pumping light source driven by the drive signal is measured so as to correspond to a drive condition of the pumping light source, to calculate a slope of an I-L characteristic of the pumping light source, which is used to correct a proportional factor of an AGC circuit.
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