Optical amplification device

Details Optical amplification device Optical amplification device

2005-03-15

2008-08-26

Keith, Jack W (Department: 3663)

Optical: systems and elements

Optical amplifier

Optical fiber

C359S341410, C398S037000

Reexamination Certificate

active

07417792

ABSTRACT:
An optical amplification device is disclosed that performs feedback control to maintain an amplification gain to be a constant based on measured power of input light and power of output light. The device includes a feedback control coefficient switching unit configured to, when performing the feedback control on a difference from an object amplification gain, distinguish a state of increasing or decreasing the number of frequencies of the input light and a steady state by making comparison and determination whether an amplitude of at least one of the power of the input light and the power of the output light is in a predetermined range, and switch the feedback control coefficient. Therefore, it is possible to reduce variation of the power of the output light caused by noise in the steady state without affecting operations of increasing and decreasing a number of frequencies of a light signal.

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Japanese Patent Office Action mailed Jun. 27, 2006 for corresponding Japanese Patent Application No. 2004-567538.

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