Method and device to detect the variation of propagation times in a ring interferometer and their application in controlling the wavelenght

摘要

the method and the corresponding device, detection of change of propagation time in the ring of a modulation interferometer using a rotary traveling wave phase from the ring counter to a time slot of an asymmetrical double propagation time. tial.create a level shift in the modulation of the phase difference of the two waves emerging from the ring. these levels are detected in the pulse output signal, the width of which is varied with the propagation time.;the invention applies, in particular to the control of the wavelength of the source of the interferometer, especially as a result of temperature variations of the source.