Patent ID: 7224515
Filing Date: 2007-05-29
Classification: H01S,H04B,H04J

Abstract:
1. An optical amplifier having an adjustable gain set point, comprising: (i) amplifying means for amplifying an optical signal comprising channels of different wavelengths, (ii) gain control means for controlling the gain of the amplifying means so as to amplify the different channels in accordance with a required gain tilt, and (iii) gain tilt adjustment means for applying a gain tilt adaptation profile to the gain control means to compensate for an inherent gain tilt of the amplifying means to produce the required gain tilt, and for changing the gain tilt adaptation profile in response to a change in the gain set point from a first gain setting to a second gain setting to maintain the required gain tilt during the period in which the gain is being changed between the first gain setting and the second gain setting, the gain tilt adjustment means comprising a control loop having at least one control coefficient which is changed as a function of at least one characteristic of the gain control means.