Unidirectional gyroscope using optomechanics to avoid mode-locking.

We propose a method to avoid the mode-locking problem in an ring laser gyroscope by restricting the lasing field inside the gyroscope to one direction only. Output from this unidirectional gyroscope is split into a reference field and a signal field, which is sent into a dispersive system so that it acquires an additional phase when its frequency changes because of the Sagnac effect. Angular velocity of absolute rotation is estimated by measuring the phase of the signal field. Noise properties of the dispersive system, created by using optomechanically induced transparency, are studied and the conditions for optimal performance of the gyroscope are derived. [ABSTRACT FROM AUTHOR]