DEVICE AND METHOD OF USING OPPOSITELY PROPAGATING SIGNAL FOR LOCATING EVENTS Russian patent published in 2010 - IPC G01B11/00 G01B9/02 G02B6/27 

FIELD: physics.

SUBSTANCE: method of localising an event involves making a waveguide with first and second arms with formation of a Mach-Zehnder interferometre which has oppositely propagating optical signals modified by the event. The device is used to control the modified oppositely propagating optical signals and determine the time difference between them in order to locate the event. The lengths of the first and second arms of the interferometre are matched. A controller is used to control polarisation states of the oppositely propagating optical signals entering the waveguide in order to match the amplitude and phase of the oppositely propagating signals from the waveguide and provide perturbation of the wavelength of the light by a value which provides perturbation of phase difference in the arms of the interferometre, and contrast and phase coherence of interference fringes at the output of the Mach-Zehnder interferometre is maintained.

EFFECT: higher accuracy of locating an event.

10 cl, 19 dwg