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6 November 2003 Limitations to the measurement accuracy of a distributed polarization coupling detection system
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In this paper, a white light interferometer has been designed to measure the distributed polarization coupling in high birefringence fibers. The limitations to the measurement accuracy have been analyzed. The main structure is a Michelson interferometer. A superluminescent diode (SLD) has been adopted as the broadband source in the white light interferometer. Corner mirrors have been adopted to reflect the light beams in both arms of the Michelson 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 for a certain linear motion rail. The full width half maximum (FWHM) spectrum of the SLD is 50 nm, and its central wavelength is 1300 nm. If the modal birefringence of the HBF is 6 X 10-4, a spatial resolution of 56 mm can be achieved. A high sensitivity photo detector and a high-resolution analog to digital converter (ADC) have been adopted. These devices are capable of testing a coupling point with accuracy up to -80 dB.
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Wencai Jing, Yimo Zhang, Ge Zhou, Haifeng Li, and Feng Tang "Limitations to the measurement accuracy of a distributed polarization coupling detection system", Proc. SPIE 5174, Novel Optical Systems Design and Optimization VI, (6 November 2003);

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