Dynamic path length changes in all-fiber mirrors: Transmission modulation

In this paper, we present a technique to modulate the transmission of an all-fiber mirror. This technique is based on the phase modulation of the light in the fiber loop, combined with the time delay between the clockwise and anticlockwise propagating beams. Using Jones calculus, a theoretical analysis has been carried out to describe the effects of static polarization changes and a dynamic phase modulation. An experimental all-fiber optical mirror has been constructed, and using a 1-MHz piezoelectric disc as the phase modulator, we demonstrate that it is possible to achieve either a 1-MHz or 2-MHz transmission modulation by adjusting the polarization state.