Optical amplification apparatus, optical communication...

Optical: systems and elements – Optical amplifier – Raman or brillouin process

Reexamination Certificate

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C359S341410

Reexamination Certificate

active

08049955

ABSTRACT:
A Raman amplifier inputs pump light into an optical fiber (transmission path) through which an optical signal passes, to amplify the optical signal. An optical receiving unit is provided downstream of the Raman amplifier and monitors the power of the optical signal amplified by the Raman amplifier. A calculating unit determines Raman amplification gain based on the power of the optical signal monitored by the optical receiving unit, and calculates the power of a noise component included in the optical signal based on the gain. The calculating unit, in real-time, calculates the power, which varies in complicated manners depending on conditions, and outputs information concerning to the power to another apparatus at a frequency on the order of milliseconds.

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Extended European Search Report, mailed Jun. 12, 2009, in corresponding European Application No. 08165364.4 (9 pp.).
Japanese Office Action issued Dec. 2, 2009 in corresponding Japanese Patent Application 2008-024231.

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