Effect of Extrinsic Perturbation by Transverse Pressure, Bending and Tension Birefringence

Birefringence and polarization dispersion caused by elliptical core, twist, pure bending, transverse pressure and axial tension are studied by treating these deformations as perturbations to step-index single-mode fiber with a round core. These effects are formulated in terms of fiber structure and perturbation parameters and are compared comprehensively. The results show that as the transverse pressure is increased, the birefringence also increases. When transverse pressure is 0.8 KgW/m is applied the delta beta is 2.6731 rad/m and DGD is 1.835 ps/Km and it increased to 4.5761 rad/m and 3.7682 ps/Km respectively when transverse pressure in increased doubled. This also shows that the transverse pressure is more dominated to polarization and remains steady but birefringence varies to the wavelength. The results shows that as the bending radius increased the delta and DGD decreased and polarization is steady for the corresponding bending and wavelength but the delta beta is varying with wavelength for the corresponding bending radius, the Delta beta is 0.0527 rad/m and DGD is 0.0440 ps/Km for the bending radius of 0.20 m and this increased to 0.1463 rad/m and 0.1208 ps/Km respectively as bending radius decrease to 0.12 m. The results show that as spooled tension is increased the delta beta and DGD increases and also these increases as bending radius decreased. The Delta beta is 2.6909 rad/m and DGD is 2.2148 ps/Km for the spooled tension of 0.1936 N and it increases to 4.8969 rad/m and 4.0301 ps/Km respectively for tension increased to 0.3658 N at bending radius of 0.1m. The delta beta and DGD decreases to 1.2928 rad/m, 1.0639 ps/Km for tension = 0.1936N and 2.3958 rad/m, -1.9715 for tension 0.3658N respectively when the bending radius increased to 0.20m.