A method is provided for establishing a communication path in an optical network, the communication path comprising a plurality of sections, wherein the power level of a section is controlled by a respective power control unit of a network node. The method comprises the steps of, in response to a request to establish a communication path, step 201, controlling at least one power control unit to perform a first power-up mode of operation. The first power-up mode of operation comprises the step of setting a power control factor of a respective section of the communication path directly to a value estimated to provide a target power level, step 203.