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The temperature sensitivity of modal birefringence (dB/dT) of different types of polarization-maintaining fibers with side holes was measured using Sagnac loop interferometer. The thermal expansion coefficient can be varied by controlling the amount of germanium doped in the core region. Using this method dB/dT could be made higher (~10-7/degC) than that of standard PMFs (~10-8/degC) or comparable...
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