Part IV of this series gave two procedures (termed double-pass procedures) for synthesizing birefringent networks containing only half the number of crystals normally required. These techniques were applicable when the desired amplitude transmittance of the network satìsfied certaìn restrictions. This paper describes additional double-pass procedures which apply to a substantially larger class of amplitude transmittances.
E. O. AMMANN and J. M. YARBOROUGH, "Optical Network Synthesis Using Birefringent Crystals. VI. Additional Techniques for the Synthesis of Lossless Double-Pass Networks," J. Opt. Soc. Am. 57, 349-350 (1967)