High-performance integrated-optical chip for a broad range of fiber-optic gyro applications.

A high-performance integrated-optical device for a broad range of fiber-optic gyro applications is reported. The circuit contains four directional couplers and six phase modulators that form the fiber-loop coupler, the bias and serrodyne phase modulators, and an on-chip interferometric serrodyne phase detector. The chip was fabricated by the annealed-proton-exchange method in X-cut LiNbO(3), which yielded a highly polarizing guided circuit with a polarization extinction ratio of at least 60 dB.

Stable low-loss proton-exchanged LiNbO(3) waveguide devices with no electro-optic degradation.

Channel waveguides and Mach-Zehnder interferometers were fabricated in LiNbO(3) by annealed proton exchange. The waveguides had a loss of 0.15 dB/cm and a fiber-to-fiber insertion loss of 1.

High-quality LiTaO(3) integrated-optical waveguides and devices fabricated by the annealed-proton-exchange technique.

High-quality single-mode LiTaO(3) integrated-optical waveguides and devices were fabricated below the Curie temperature by the annealed-proton-exchange technique. The waveguides had a high polarization extinction (51 dB), low propagation loss (<0.25 dB/cm), and low fiber-to-waveguide coupling loss (0.