are half the magnitude of the input vector 700 and are orthogonal with respect to one another the cartesian coordinate reference system of fig7 b and that of fig7 a may be arbitrarily rotated with respect to each other as long as the angular relationship between the vector components is correct fig7 c portrays a first condition where the first and second phase shifters 610 615 are set to advance the relative phase between the two vector components 705 710 by ninety degrees the vector components 705 710 are now in phase fig7 d portrays a second condition wherein the phase shifters are set to retard the relative phase between the two vector components 705 710 by ninety degrees the vector components 705 710 are now in opposite phase fig7 e portrays the output of the polarization beam combiner 620 in response to inputs from the two phase shifters under the advance ninety degree relative phase shift first condition the input signal for this condition appears at the combiner output port 670 fig7 f portrays the combiner output 620 for the retard ninety degree relative phase shift second condition the vector components cancel each other resulting in zero output at the combiner output port 670 the switch thus provides signal transmission or interruption depending on the settings of the phase shifters in an embodiment phase shifters meeting the performance requirements of the remote circuit locking switch may be implemented using a material the imparts faraday rotation of polarized light as it passes through a magneto optical material in the direction of an applied magnetic field bismuth substituted iron garnet and or orthoferrites are suitable faraday rotation materials electro magnetic coils.