Abstract: To simplify the adaptation of a polarization that fluctuates over time to a predefined polarization state, a device for converting the polarization of light is proposed, which can be manufactured cost-effectively and operated with minimal outlay. For this, the device has an input (E) for receiving light having any polarization PE at all, as well as an output (A) for emitting light having a predefined polarization PA. A device (PBS) splits the received light into variably polarized light components, one of the light components propagating through a device (P1, P2) for adjusting the polarization. The light components are again coupled in a device (C), the coupling being adjustable for outputting light with a maximum output intensity, and this light being able to be output with the predefined polarization PA at the output (A). In this manner, it is only necessary to control one single physical parameter in the form of the coupling of the light components to optimize the device according to the present invention.

Abstract: WDM multi-channel systems for large distances having a number of intensifiers may cause an increase in intensifications, which lead to considerable differences in intensity, even given modest wavelength dependence, making spectral leveling maybe necessary. The light from the fiber is first spectrally into channels, and, thus locally separated, projected onto the surface of an optic limiter based on an OASLM (optical addressed, spatial light modulator), in which the intensive channels are overproportionally attenuated. The tension dependence of liquid crystal cells, derived from exposure, is used to level the WDM channels. Lastly, the channels are again imaged onto a point and coupled into another fiber. The invention is used in WDM multi-channel systems for large distances a number of intensifiers.

Abstract: WDB multi-channel systems for large distances having a number of intensifiers cause an increase in intensification, which can lead to considerable differences in intensity, even given modest wavelength dependence This makes spectral levelling necessary. In accordance with the invention, the light from the fiber is first split spectrally into channels, and, thus locally separated, projected onto the surface of an optic limiter based on an OASLM (optical addressed, spatial light modulator), in which the intensive channels are overproportionally attenuated The tension dependence of liquid crystal cells, derived from exposure, is used to level the WDM channels Lastly, the channels are again imaged onto a point and coupled into another fiber.