Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2005-03-01
2005-03-01
Tarcza, Thomas H. (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S341310
Reexamination Certificate
active
06862133
ABSTRACT:
The present invention has an object to provide a Raman amplifier, a WDM optical communication system and a method of controlling the Raman amplification, capable of optimizing amplification characteristics in response to a change of operating conditions of the system so that transmission quality of the WDM signal light can be maintained in good. In order to achieve the above object, in the Raman amplifier according to the present invention, a plurality of pumping light generated by a pumping light generating section capable of varying a wavelength and power of the plurality of pumping light, are multiplexed by a pumping light multiplexing section that has wavelength variable transmission characteristics, and are supplied to an optical transmission path via a pumping light supplying section, and signal light being propagated through the optical transmission path is Raman amplified, wherein the Raman amplifier comprises a pumping light administrating section that controls supply conditions of the pumping light by adjusting operational setting of the pumping light generating section and the wavelength transmission characteristics of the pumping light multiplexing section in synchronization with the change with time of the system operational conditions.
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EP Search Report for Corresponding EP Application dated Jun. 20, 2003, EP02023035.
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Hayashi Etsuko
Onaka Miki
Sugaya Yasushi
Fujitsu Limited
Hughes Deandra M.
Tarcza Thomas H.
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