07061666 is referenced by 10 patents and cites 20 patents.

An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation.

Title
Gain and signal level adjustments of cascaded optical amplifiers
Application Number
10/414237
Publication Number
7061666 (B2)
Application Date
April 16, 2003
Publication Date
June 13, 2006
Inventor
Taiki Kobayashi
Kawasaki
JP
Hiroyuki Itou
Sapporo
JP
Susumu Kinoshita
Kawasaki
JP
Norifumi Shukunami
Sapporo
JP
Shinya Inagaki
Kawasaki
JP
Agent
Staas & Halsey
Assignee
Fujitsu
JP
IPC
H01S 3/00
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