Effect of a magnetic field on polarisation of light in an optical fibre with a random distribution of linear birefringenceстатья
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Дата последнего поиска статьи во внешних источниках: 8 декабря 2019 г.
Аннотация:A numerical model is proposed to describe the evolution
of polarisation of a light wave propagating through a telecommunication
fibre with random linear birefringence in a magnetic field.
As a result of statistical processing of a set of numerical simulation
results, a convenient phenomenological formula is obtained for the
first time for the dependence of the average value of the polarisation
rotation angle on the magnetic field, the fibre parameters and
its length. It is found that the average value of the polarisation rotation
angle in a long telecommunication fibre in the representation of
the Stokes vectors linearly depends on the applied longitudinal
magnetic field (as in the classical Faraday effect for an isotropic
medium) but is proportional to the root of the fibre length. It is
theoretically shown and experimentally confirmed that the polarisation
rotation angle for an extended segment of a telecommunication
fibre (50 km) is two orders of magnitude less than that for an
isotropic fibre of the same length and material.