An optical wavelength detector based on lithium niobate optical waveguide and its detection method

Abstract

The invention relates to an optical wavelength detector based on a lithium niobate optical waveguide and a detection method thereof. The optical wavelength detector includes a lithium niobate body material, an asymmetric Mach-Zehnder interferometer optical waveguide structure and two coplanar electrodes; An asymmetric Mach-Zehnder interferometer optical waveguide structure is set on the lithium niobate body material, and the asymmetric Mach-Zehnder interferometer optical waveguide structure includes an input end, a long interference arm, a short interference arm and an output end, and two common The surface electrodes are respectively arranged on both sides of the short interference arm or the long interference arm; the output light intensity is changed by changing the voltage applied to the coplanar electrodes, and the corresponding voltage when the output light intensity is maximum is the characteristic voltage of the light to be measured. The wavelength of the light is obtained from the characteristic voltage, and there is a linear relationship between the wavelength of the light to be measured and the characteristic voltage. The optical wavelength detector is a device based on a semiconductor optical waveguide, which has a compact structure and a small size, can be hand-held after the peripheral circuit is integrated, and has strong shock resistance.

Description

technical field [0001] The invention relates to an optical wavelength detector based on a lithium niobate optical waveguide and a detection method thereof, belonging to the technical field of optical wavelength detection. Background technique [0002] Optical wavelength detection is widely used in scientific research and production: for example, in the field of fiber grating sensing widely used in bridge stress and power cabinet temperature, the target parameters are mainly determined by detecting the wavelength returned by the fiber grating; The process is more directly dependent on the wavelength of the detection results. [0003] At present, the mainstream method of detecting the wavelength of light is to rely on a high-precision spectrometer to reflect light of different wavelengths to different positions of the CCD, and the central wavelength can be calculated from this position information. The disadvantage of this method is that the equipment is bulky, and the overal...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the equipment is bulky, the overall equipment is generally 40-60 cm wide, 30-40 cm high, 40-50 cm deep, and weighs about 5-10 kg, which cannot be hand-held

In practical applications, the demand for handheld devices is very large for field work and many outdoor measurement and maintenance. The current high-precision spectrometer solution cannot meet such needs.

[0004] In addition, the free optical path between the high-precision spectrometer and the CCD requires high-precision alignment of a set of lenses and high-precision gratings. big limitations

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