Abstract

The geometric polarization in single mode optical fibers is investigated theoretically and experimentally and the measurement results are reported. This paper consider the geometrical measurement method of weights the own modes of poorly directing optical fiber with strong linear anisotropy. This given method is based on definition the geometrical parameters lines with equal intensity in a vicinity of zero radiation image from fiber output. The modes weights have been received as a result of computer processing of experimental images of intensity distribution at displacement of laser spot concerning the center of fiber input. It is found that neglecting the geometrical birefringence, even under the weakly guiding approximation, can lead to significant errors in the calculation of PMD and the zero PMD wavelengths. It is also found that one can obtain zero PMD in the single-mode region even by applying a suitable differential stress along the major axis. This is very attractive since then the geometrical and stress birefringence adds up to give increased total birefringence.

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