Wideband temperature-compensated optical isolator or circulator configuration using two Faraday elements

Two Faraday elements are configured with two linear retardation elements such that the variations in their individual rotations due to wavelength and temperature changes are compensated for. Wideband isolation between 1250 and 1650 nm is demonstrated using 45 degrees and 90 degrees yttrium iron garnet elements and two 45 degrees right-angle glass prisms (n ~ 1.73) that produce approximately 60 degrees linear retardations on total internal reflection.