Proton exchange method and metal diffusion method are the most common methods to prepare lithium niobate waveguide, due to the use of these two methods of the preparation of waveguide device waveguide differ with the refractive index of substrate layer is small, light limit function is weak, and in the process of making the introduction of foreign ions can destroy the properties of lithium niobate crystal, so as to affect the performance of the waveguide.

Multi-function integrated optical chip (MIOC, or Y Waveguide Modulator) is a key component in Fiber Optic Gyroscope (FOG) for measuring angular velocity of an inertial navigation system. This integrated device, fabricated on Lithium Niobate (LiNbO3) material, is composed of a polarizer, a Y-junction coupler and dual electro-optical phase modulators. Waveguides on the chip are produced by the Annealed Proton Exchange (APE) process. This MIOC device has been used in a lot of high-sensitivity inertial navigation systems to detect angular velocity . It has highly reliable performance with wide temperature range tolerance.

LiNbO3 Wide Bandwidth Phase Modulator is manufactured by micro-electronics technology. Waveguides on the modulator are produced by Annealed Proton Exchange(APE) process or Ti-diffusion process. They can work on single polarization or birefringence situation. With traveling-wave electrode, the modulator are ideally suited for high bandwidth operation at 1GHz, 10GHz, 20GHz, and up to 30GHz. It also has highly reliable performance with wide temperature range tolerance.

LiNbO3 Intensity Modulator is manufactured by micro-electronics technology. Waveguides on the modulator are produced by Annealed Proton Exchange(APE) process or Ti-diffusion process. They can work on single polarization or birefringence situation. With traveling-wave electrode, the modulator are ideally suited for high bandwidth operation at 1GHz, 10GHz, 20GHz, up to 30GHz. It also has highly reliable performance with wide temperature range tolerance.