nd Imaging, San Jose, CA, January 27-28, s.l., 2004. 6. Boyd, R. W., Nonlinear Optics, Academic Press, San Diego, CA, 2008, ISBN-13: 978-0123694706. 7. Agrawal, G. P., Nonlinear Fiber Optics, 4th edn., Academic press, San Diego, CA, 2006, ISBN-13: 978-0123695161. 8. Pool, C. D., Wagner, R. E., Phenomenological approach to polarization dispersion in single mode fibers, Electronics Letters, 22, 1029-1030 (1986). 9. Curti, F., Daino, B., Mao, Q., Matera, F., Someda, C. G., Concatenation of polarization disper- sion in single mode fibers, Electronics Letters, 25, 290-292 (1989). 10. Betti, S., Curt, F., Daino, B., De Marchis, G., Iannone, E., Matera, F., Evolution of the bandwidth of the principal states of polarization in single mode fibers, Optics Letters, 16, 467-469 (1991). 11. De Angelis, G., Galtarossa, A., Gianello, G., Matera, F., Schiano, M., Time evolution of polariza- tion mode dispersion in a long terrestrial link, IEEE Journal of Lightwave Technology, 10, 552-555 (1992). 12. De Marchis, G., Iannone, E., Polarization dispersion in single mode optical fibers: A simpler formulation based on pulse envelope propagation, Microwave and Optical Technology Letters, 4, 75-77 (1991). 13. Bononi, A., Vannucci, A., Statistics of the Jones matrix of fibers affected by polarization mode dispersion, Optics Letters, 26, 675-677 (2001). 14. Curti, F., Daino, B., De Marchis, G., Matera, F., Statistical treatment of the evolution of the principal states of polarization in single mode fibers, IEEE Journal of Lightwave Technology, 8, 1162-1166 (1990). 15. Gordon, J. P., Kogelnik, H., PMD fundamentals: Polarization mode dispersion in optical fibers, Proceedings of the National Academy of Sciences, 97, 4541-4550 (2000). 16. Born, M., Wolf, E., Principles of Optics: Electromagnetic Theory of Propagation, Interference and Diffraction of Light, 7th edn., Cambridge University Press, Cambridge, U.K., s.l., 1999, ISBN-13: 978-0521642224. 17. Shen, Y. R., The Principles of Nonlinear Optics, Wiley Interscience, Hoboken, NJ, s.l., 2002,