Pressure effects in polarization maintaining fibers are investigated both experimentally and theoretically. Interferometric measurements of the propagation times and polarization mode dispersion as a function of hydrostatic pressure over the range 0 to 40 MPa are presented. The finite-element method is used to calculate the pressure-induced variations of the asymmetrical stress in the core. It is observed and comprehensively explained that the birefringence increases with external applied hydrostatic pressure.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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