Thermal-stress-induced birefringence in panda and bow-tie optical fibers

In this paper, a thermoelastic potential method is introduced to calculate the stress distribution in mechanically homogeneous birefringent fibers. Two kinds of such fibers; namely panda and bow-tie fibers, are studied and their birefringence is calculated. Stress distribution of bow-tie fiber is compared with that obtained from the finite element method showing a fair agreement. Results show that a higher degree of birefringence can be obtained by increasing stress applying zone area, decreasing the distance of this zone from the core and to some extent by increasing the cladding area.