Optical Rotation-Sensing Interferometer with (3X3)-(2X2) Directional Coupler.
DEPARTMENT OF THE NAVY WASHINGTON DC
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This document describes a Sagnac rotation-sensing interferometer with a fiber-optic loop for providing a closed optical path in which counter-propagating light beams are phase shifted due to the Sagnac effect and with an optical coupler for splitting an input beam into the counter-propagating light beams in the fiber-optic loop and for providing for interference between the output beams of the fiber-optic loop. The optical coupler includes a 3X3 coupler with two first output waveguides symmetrically disposed about an input waveguide for splitting the input beam into equal components and a 2X2 coupler with two second output waveguides adjacently disposed for providing interference between the output beams. The second output waveguides of the 2X2 coupler couple the first output waveguides of the 3X3 coupler to the end of the fiber-optic loop. Author
- Fiber Optics and Integrated Optics