Investigation of the spectral dependences of some of the polarization characteristics of fiber waveguides with an elliptic stress-inducing cladding and a circular core

An experimental investigation was made of the spectral dependences of the modal birefringence B, of the polarization dispersion τ_p, and of the difference D_x–D_y between the chromatic dispersions of polarization modes in fiber waveguides with an elliptic stress-inducing cladding, a second circular buffer cladding, and a circular core. The investigation was carried out in the wavelength range 1.15–1.75 μm. The magnitude of the changes in B, τ_p, and D_x–D_y depended on the dimensions of the buffer cladding. The dependences obtained were explained satisfactorily by an analysis of the similarity of the distributions of the intensity of the fundamental mode and of the difference of the stresses along the optic axes of the investigated fiber waveguides.