Abstract: Systems and methods are provided for managing an application configuration using messaging over a communications network. A configuration message including configuration changes to the application and a corresponding effective date when the configuration changes are to be applied to the application is received. Following the receipt of the configuration message, the message is stored. When the effective date occurs, the configuration changes from the received configuration message are applied to the current configuration of the application.

Abstract: An optical amplifying unit includes an input for the input optical signals and an output for the output of the optical signals. A single-mode active fiber codoped with Er and Yb is optically connected to the input and the output and adapted to amplify the optical signals. A first pump source generates a first pump radiation including an excitation wavelength for Er, and a second pump source for generates a second pump radiation including an excitation wavelength for Yb. A first optical coupler optically couples the first pump radiation into the core of the active fiber in a co-propagating direction with respect to signal direction, and a second optical coupler optically couples the second pump radiation into the core of the active fiber in a counter-propagating direction with respect to signal direction.