Optical amplifier

Lead is connected with the optical amplifier the wavelength division multiplexing system, for example Laman amplifier (1) light gain, so the gain of amplifier is fixed by connected to the WDM is optically (3) are input end of shaker transistor (4) is. The polarizer can (10) and control device is a component; the component is connected with a detection Laman optical fibre (5) and output power of different wavelength. A a a controller, a powering any hope shape of the light gain, for example with good flat. Moulded by an amplifier single wavelength pumping light source a WDM is controlled by the polarization state (8), which is not the usual is multi-wavelength light source.