SWITCHING SBS GYRO WITH FIXED PUMP SEPARATION

A ring-laser gyroscope which generates in an optical ring resonator and in response to a first pump beam, a first back-scattered beam propagating in a direction; generates in the optical ring resonator and in response to a second pumped beam, a second back-scattered beam propagating in an opposite direction; determines a first difference between the frequencies of the first and second back-scattered beams; reverses the directions of the first and second back-scattered beams; determines a second difference between the frequencies of the first and second back-scattered beams; determines a third difference between the first and second differences; and determines a rotation of the optical ring resonator in response to the third difference.