Patent ID: 7061666
Filing Date: 2006-06-13
Classification: H01S,H04B

Abstract:
1. An apparatus comprising: a first optical amplifier receiving a light and amplifying the received light; a first gain controller detecting a power level of the light received by the first optical amplifier and a power level of the light amplified by the first optical amplifier, and controlling gain of the first optical amplifier in accordance with the detected power levels; a second optical amplifier receiving the light amplified by the first optical amplifier, and amplifying the received light; a second gain controller detecting a power level of the light received by the second optical amplifier and a power level of the light amplified by the second optical amplifier, and controlling gain of the second optical amplifier in accordance with the detected power levels; and a level controller which, when a level of the light received by the first optical amplifier changes by Δ, controls a level of the light received by the second optical amplifier to change by approximately −Δ.