Optical: systems and elements – Optical amplifier – Optical fiber
Reexamination Certificate
2005-06-28
2008-08-26
Hellner, Mark (Department: 3663)
Optical: systems and elements
Optical amplifier
Optical fiber
C359S337000
Reexamination Certificate
active
07417791
ABSTRACT:
Multi-wavelength light is inputted to an erbium-doped fiber as an optical amplification medium. Pump light is supplied to this erbium-doped fiber. When a transition from a state signal light on the short wavelength area in the multi-wavelength is input in the erbium-doped fiber to a state the signal light is not input, the output power of signal light on the long wavelength area in the multi-wavelength light can vary. The wavelength of pump light is selected in such a way that the output power of the signal light on the long wavelength area can not be negative when the power varies.
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European Office Action for corresponding European Application No. 02 001 080.7-2222.
Hayashi Etsuko
Onaka Miki
Shukunami Norifumi
Sugaya Yasushi
Watanabe Manabu
Fujitsu Limited
Hellner Mark
Staas & Halsey , LLP
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