Fiber optic amplifier with device for monitoring the pump and input power

摘要

In the case of fibre-optic amplifiers, various parameters are measured, for example the input power, in order to make assessments regarding the operating mode of the transmission link and of the fibre-optic amplifier itself. In known fibre-optic amplifiers, a part of the input power is extracted through a coupler (2) for this purpose. In the case of transmission of optical signals at low power, such as for example in the case of digital signals, the extracted part of the input power can be detected only with high expense. In the fibre-optical amplifier according to the invention, the radiation produced by the amplified spontaneous emission (ASE) is extracted and evaluated in order to monitor the pump power and input power. Assessments can thereby be made regarding the state of the input signal.