Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2007-09-11
2007-09-11
Keith, Jack (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C398S065000
Reexamination Certificate
active
10761296
ABSTRACT:
An object of the present invention is to provide at low cost, a highly functional and small size optical amplifier, which realizes a polarization mode dispersion (PMD) compensation function and an optical amplifying function, with a simple construction. To this end, the optical amplifier of the present invention comprises: a polarization control section that controls the polarization state of input signal light; a PMD generation section that receives the signal light from the polarization control section at a polarization-preserving fiber thereof doped with a rare earth element, and gives a differential group delay between orthogonal polarization mode components of the signal light to perform PMD compensation and at the same time amplifies the signal light; a pumping light supply section that supplies pumping light to the polarization-preserving fiber; a monitoring section that monitors the PMD generation state of the signal light from the PMD generation section, and the like; and a control section that controls the polarization control section and the pumping light supply section based on the monitor results of the monitoring section.
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Hayashi Etsuko
Onaka Miki
Sugaya Yasushi
Diacou Ari M.
Fujitsu Limited
Keith Jack
Staas & Halsey , LLP
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