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The components of linear birefringence are essentially linear frequency dependence, Shape birefringence depends strongly on the frequency, for lower frequencies the value of Bc increases slowly with increasing ν, is an approximately constant, and give maximum value (0.46) for frequencies within the region 1.8 <V< 2.2. In contrast, when v increases at higher frequencies, the value of Bc steadily decreases. While it was shown that stress-related birefringence closely correlates with frequency, Bs has the same value as Bc and is (0.307) in the frequency value (5). This indicates that Bs contributes to Bc for large v values when the majority of the guided mode is contained inside the core. The minor axis of the core should align with the highest compressive stress, causing more power travel in the cladding and widening the mode size as the v value decreases. The fact that changes take place in that regime and that the cladding’s stress-induced birefringence is the opposite of that of the core, that is, the main axis of the core elliptical experiences the greatest extent of the core compressive stress.
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