A fiber gyroscope usin a polarization-maintaining optical
fiber(PMF) has been studied. A phase shift of the laser beam passing
through the PMF by an ultrasonic wave has been observed In this
paper, the fiber gyroscope using the PMF and a polarization-maintaining
fiber coupler(PMC) is presented. Moreover, the Sagnac phase modulation
by the ultrasonic wave is studied.
"Fiber gyroscope using a polarization-maintaining optical fiber and a fiber coupler", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); doi: 10.1117/12.34826; https://doi.org/10.1117/12.34826