White light interferometry has been adopted to measure distributed polarization coupling in high-birefringence waveguides. Since the coupling mode is weak compared to the exciting mode, the contrast ratio of the interferogram is very low. This will increase the difficulty of direct detection of the polarization coupling intensity. By rotating the angle between the polarization eigenmodes and the principal axis of the linear polarizer from 45 degrees to 85 degrees , the contrast ratio of the interferogram can be improved more than 10 times. As a result, the measurement sensitivity can be improved more than 100 times.
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In this paper, a novel method to measure the distributed polarization mode coupling in polarization-maintaining (PM) fibers is introduced. The measurement system is based on white light interference. A super luminescent diode is used as the broadband light source in the system. The whole test system is working on l300nm wavelength. There are two main parts of the measurement equipment: polarization adjustment and a scanned Michelson interferometer. In order to improve the accuracy, a piezoelectric transducer (PZT) is applied in the scanned Michelson interferometer. The maximum length of tested polarization-maintaining fiber is one kilometer, and the spatial resolution of this method reached 60 mm along the tested PM fiber. The degree of polarization mode coupling that could be detected is -75dB.
White light interferometry has been adopted to measure the distributed polarization coupling in high birefringence fibers. A superluminescent diode is adopted as the optical source in the white light interferometer. To enlarge the measurement range, the light beam in the scanning arm of the Michelson interferometer is reflected three times. Thus the scanning range of the interferometer is doubled. The full-width half-maximum spectrum of the SLD is 50nm, and the central wavelength is 1300 nm. If the modal birefringence of the HBF is 5x104, a spatial resolution of 70 mm can be achieved. A high sensitivity photo detector and a high-resolution analog to digital converter have been adopted. The polarization coupling intensity measurement accuracy can be up to -75 dB.
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