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High-speed polarimetric measurements for fiber-optic communications

A high-speed heterodyne polarimeter at 1.55 micrometers wavelength with an intermediate frequency of 1 GHz is demonstrated. To verify the good performance of the instrument, birefringence measurements on a polarization maintaining fiber with a submillimetric beat- length have been performed. The repeatability of the measurement is excellent, and the precision ranges around 0.3%.