METHOD AND DEVICE FOR DETECTING THE VARIATIONS OF PROPAGATION TIME IN A RING INTERFEROMETER AND THEIR APPLICATION TO WAVELENGTH MONITORING

摘要

P THE METHOD AND THE CORRESPONDING DEVICE FOR DETECTING THE VARIATIONS OF TIME OF PROPAGATION IN THE RING OF AN INTERFEROMETER UTILIZING A PHASE MODULATION OF THE COUNTER-ROTATING WAVES RUNNING THE RING BY ASYMMETRICAL CURVES AT A DOUBLE PERIOD OF AN INITIAL SPREAD TIME, WHICH CREATE ZERO PHASE SHIFT BEARINGS IN THE MODULATION OF THE DIFFERENCE OF TWO WAVES EMERGING FROM THE RING. THESE BEARINGS ARE TRANSLATED BY PULSES IN THE OUTPUT DETECTING SIGNAL WHOSE WIDTH IS VARIABLE WITH THE TIME OF PROPAGATION. / P P The invention applies, in particular to the control of the wavelength of the source. OF THE INTERFEROMETER, PARTICULARLY DUE TO VARIATIONS IN TEMPERATURE OF THE SOURCE. / P