By Charles H. Holbrow, Enrique Galvez, Beth Parks; the paper prints C. H. Holbrow, E. Galvez and M. E. Parks.
Published in American Journal of Physics 70(3), pp. 260–265, March 2002. DOI: 10.1119/1.1432972. Colgate University hosts this copy.
Cited passages: §IV and §IV.A, printed p. 262, Figure 4 and equations (1)–(5): field transformations and unitary beam-splitter model; §IV.D, printed p. 264, Figure 5: polarization routing into separate detected paths. The source uses its own port and phase conventions.