Patent ID: 7924499
Filing Date: 2011-04-12
Classification: H01S,H04B

Abstract:
1. An apparatus comprising: a first optical amplifier receiving light and amplifying the received light with a gain of the first optical amplifier; a second optical amplifier receiving the light amplified by the first optical amplifier, and amplifying the received light with a gain of the second optical amplifier; detectors detecting a power level of the light received by the first optical amplifier, a power level of the light amplified by the first optical amplifier, 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 a gain adjustor which, in accordance with the detected power levels, 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.