Example of generalized Malus laws for 18 orientations of the polarizer upstream from the injection in a chain of fibers made of FDDL A, FPR A, and the A fiber coupler (total length of 18.88 m), and 18 orientations of the analyzer downstream with the setup of Fig. A.1. The dashed line is the envelope of Eq. (B.1) with a measured birefringence phase difference between the two polarization axes of 20°, yielding a birefringence beating length of 339 m according to the method presented in Appendix B.