Optical crystal electric field sensor based on dfb laser

A DFB laser, electric field sensor technology, applied in the sensor field, can solve the problems of inability to realize high-frequency signal detection, weak light source coupling power, etc., and achieve the effects of improving measurement accuracy and stability, reducing manufacturing difficulty, and reducing polarization mode noise.

CN103308783BActive Publication Date: 2015-12-09STATE GRID CORP OF CHINA +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-12-09

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Abstract

The invention relates to the field of a sensor, in particular to a distributed feedback (DFB) laser-based optical crystal electric field sensor which sequentially comprises a DFB laser (2), a 1 / 4 lambda slide (3), a Pockels crystal (4), a polarization analyzer (5), an electric detector (6) and a photoelectric pre-amplifier (7) in the output and input order of light. The DFB laser-based optical crystal electric field sensor is high in optical power of the DFB laser, so that the cost and the manufacturing difficulty are greatly reduced, and the polarization mode noise is greatly reduced; optical fiber coupling is not needed, so that the power noise and the polarization mode noise which are caused by slight shaking can be avoided; and the DFB laser with very low relative noise intensity is adopted as a light source, so that the DFB laser-based optical crystal electric field sensor is very high in detectable electric field intensity sensitivity.
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Description

technical field

[0001] The invention relates to the field of sensors, in particular to an optical crystal electric field sensor based on a DFB laser. Background technique

[0002] Generally, the light source used in the electric field sensor based on the Pockels electro-optic effect is non-polarized or low-polarized, such as LED or VCSEL. The light is coupled from the optical fiber into the space through a collimator device, and the space light becomes a The linearly polarized light then passes through a polarization phase delay device and an electro-optic crystal with Pockels effect to induce an external voltage / electric field signal, and the electric field / voltage signal modulates the polarization phase. The result of phase modulation is output by polarized light interference through the analyzer. The output light intensity will be related to the modulation signal of the electric field / voltage, and has a good linear relationship within a certain range, so the measurement o...

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0022] figure 1 An embodiment of the optical crystal electric field sensor based on the DFB laser of the present invention is shown: a kind of optical crystal electric field sensor based on the DFB laser includes sequentially according to the order of light output and input

[0023] - DFB laser 2: DFB laser is used as a light source, which is equipped with automatic power control and automatic temperature control circuit 1, has two directions of polarization perpendicular to each other, and the difference in polarization degree between the two polarization directions is more than 20dB;

[0024] -1...