Nonreciprocal signal coupling apparatus using optical coupling link in waveguide operating below cutoff

Claim 1

APPARATUS USEFUL FOR COUPLING INTELLIGENCE, REPRESENTED BY INPUT SIGNALS WITHIN A KNOWN FREQUENCY SPECTRUM, FROM A FIRST CHAMBER TO A SECOND CHAMBER, WHICH CHAMBERS ARE SEPARATED FROM ONE ANOTHER BY A WALL OF MAGNETIC MATERIAL HAVING AN APERTURE THEREIN AND WHERE THERE EXISTS WITHIN ONE OF SAID CHAMBERS SPURIOUS ENERGY FALLING WITHIN SAID FREQUENCY SPECTRUM, SAID APPARATUS COMPRISING: CLOSURE MEANS INCLUDING A HOUSING DISPOSED IN AND SUBSTANTIALLY CLOSING SAID APERTURE, SAID HOUSING HAVING A PARTITION THEREIN THUS DEFINING FIRST AND SECOND COMPARTMENTS; AT LEAST ONE TUBULAR WAVEGUIDE DIMENSIONED SO AS TO HAVE A LOWER CUT-OFF FREQUENCY ABOVE THE SUPPER FREQUENCY LIMIT OF SAID SPECTRUM PROJECTING THROUGH SAID PARTITION WITH THE FIRST AND SECOND EXTREMITIES THEREOF RESPECTIVELY TERMINATING IN SAID FIRST AND SECOND COMPARTMENTS; A SOURCE OF ELECTROMAGNETIC ENERGY OF A FREQUENCY ABOVE SAID WAVEGUIDE CUT-OFF FREQUENCY, SAID SOURCE BEING POSITIONED AT A FIRST EXTREMITY OF SAID WAVEGUIDE FOR DIRECTING ENERGY EMITTED THEREBY TO A SECOND EXTREMITY OF SAID WAVEGUIDE; MEANS FOR MODULATING SAID ENERGY EMITTED BY SAID SOURCE IN ACCORDANCE WITH SAID INPUT SIGNALS; AND MEANS POSITIONED AT SAID SECOND EXTREMITY OF SAID WAVEGUIDE AND RESPONSIVE TO SAID MODULATED ENERGY FOR DEVELOPING AN OUTPUT SIGNAL REPRESENTING SAID INTELLIGENCE.