Optical: systems and elements – Optical amplifier – Correction of deleterious effects
Reexamination Certificate
2005-03-22
2005-03-22
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Correction of deleterious effects
C359S341410, C359S341420
Reexamination Certificate
active
06870666
ABSTRACT:
A controlling apparatus and a controlling method for a wavelength division multiplexing optical amplifier to reduce the controlling error due to noise light included in the monitoring light. The controlling apparatus branches, by a photocoupler, a portion of WDM signal light amplified by a light level controlling part and separates the branched light into groups of even-numbered channel components and odd-numbered channel components using a wavelength channel separate filter. Monitor signals corresponding to the light powers of the even-numbered group and odd-numbered group, respectively, are generated by respective photoelectric converting parts and LPF's. One of the monitor signals, which corresponds to one of the even-numbered group and the odd-numbered group, is selected by a monitor signal selecting/controlling part and then sent to a comparator. The control apparatus conducts feedback controlling in accordance with the output signal of the comparator, so that the light level controlling part conducts to ALC (automatic level control) operate.
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Fujitsu Limited
Staas Y Halsey LLP
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