Anisotropic waveguides with an elliptic stress-inducing cladding and a circular core

A technology of fabrication of anisotropic single-mode fiber waveguides with an elliptic stress-inducing cladding and a circular core was developed. This technology was used to make fiber waveguides with a birefringence (1–3) X 10 ^– 4, a coefficient representing the coupling between the polarization modes h = (5–7) X 10 ^– 5 m ^– 1, and optical losses α = 0.5 dB/km in the vicinity of 1.6 μm. A comparison was made of the experimental data with the results of a theoretical analysis. It was found that certain mechanisms restricted the ability of these waveguides to maintain a constant polarization of the injected linearly polarized radiation.