A Polarization Maintaining Fiber Interferometer with Passive Temperature Compensation and Its Compensation Method

Abstract

The invention provides a polarization maintaining fiber interferometer with reactive temperature compensation and a compensation method of the interferometer. A temperature compensating fiber interferometer is established and combined with a reactive temperature compensation structure. According to the method, a full polarization maintaining fiber interferometer and a metal cylinder of relativelyhigh thermal expansion coefficient are included. The full polarization maintaining fiber interferometer matches a working shaft with two temperature drift arms by utilizing different refractive indexes of fast and slow axes, and temperature drift of the interferometer is made up; and one part of the arm with relatively lower temperature drift of the interferometer is wound around the metal cylinder with the relatively high temperature coefficient to form the reactive temperature compensation structure, and temperature drift of the wound fiber is increased to balance response to temperature ofthe two arms. The two manners can compensate temperature crosstack of the interferometer, and the compensation precision is higher when the two manners are combined. The novel temperature compensationmethod is ingenious in design, resistant to electromagnetic interference and can compensate crosstalk of any temperature drift amount.

Description

technical field [0001] The invention relates to an optical fiber sensing technology, in particular to an optical fiber interferometer and a compensation method thereof. Background technique [0002] As one of the important research contents in today's sensing field, fiber optic sensor has the advantages of small size, light weight, high sensitivity, large dynamic range, anti-electromagnetic interference, and ability to work in harsh environments. The application of fiber optic sensors in the measurement of the external environment is also becoming more and more extensive. Due to its polarization-maintaining properties, polarization-maintaining optical fibers are widely used in various fields of the national economy such as aerospace, aviation, navigation, industrial manufacturing technology, and communications. In order to achieve a more stable measurement of the physical quantity to be measured, the use of polarization-maintaining fiber optic interferometers in the sensing...

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Problems solved by technology

[0006] Among the above methods, the reference interferometer method, the dual sensor method, and the structure compensation method are all measured by building a new interferometer, which greatly increases the complexity of the structure; the data processing compensation method can only deal with known temperature changes. Its impact is not very practical

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