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Optical measurement systems use the interference of two waves, which must have the same polarisation. In case of transmission of polarized light in optical wave guides the polarisation maintaining fibers has to be chosen. These are special produced single mode fibers, where mechanical stress induces a high birefringence in the fiber core. Different types of strain relief elements are available (see above). Polarisation maintaining fibres are available from the visible to the NIR range. The cut off wavelength is the wavelength where one mode can be transmitted in the fibre. The fiber acts optimal like a single mode fiber in the wavelength range between the cut-off wavelength and the 1.3 time of the cut off wavelength. Because of the large tolerance of the cut-off-wavelength it is recommended the give the working wavelength when ordering. We chose the optimal fiber for you.
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