Optical: systems and elements – Optical amplifier – Raman or brillouin process
Reexamination Certificate
2006-08-22
2006-08-22
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Raman or brillouin process
C359S341400
Reexamination Certificate
active
07095553
ABSTRACT:
There is provided an optical amplifier comprising a Raman amplifying section, a rare earth element doped fiber amplifying section to be disposed in the case where the number of operating channels exceeds the number of allowable channels A, and a control section. And the control section controls the wavelength of pumping light of the Raman amplifying section such that the signal light of the entire band is able to be amplified, in the case where the number of operating channels is equal to that of allowable channels A or less, and whereas the control section controls the wavelength of pumping light of the Raman amplifying section such that the signal light of the band located out of the amplifying band of the rare earth element doped fiber amplifier is able to be amplified, in the case where the number of operating channels becomes greater than the number of allowable channels A.
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T. Tanaka, et al., “200-nm Bandwidth WDM Transmission Around 1.55 μm Using Distributed Raman Amplifier”, 28thEuropean Conference on Optical Communication (ECOC) 2002, Post-Deadline Papers, Post-deadline session 4: PD4.6, Sep. 8-12, 2002.
European Search Report dated Jun. 29, 2005 for European Patent Application No. 04 01 8359.2-2222.
Fujitsu Limited
Hellner Mark
Staas & Halsey , LLP
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