Wave-division frequency division multiplex system of optics fiber fabry-perot sensor

Abstract

A WDFDM system of a fiber Fabry-Perot sensor includes a broadband light source, a rough WDM device, fibers, a coupler, an index of refraction matching solution, sensors and splitter and a spectrometer, among which, the fiber is an ordinary single-mode one, the sensor is a fiber Fabry-Perot sensor. The rough WDM device is used to divide broadband light into light in multiple channels to realize WDM. The splitter cuts in sensor of different cavity lengths on each channel to realize WDM. Sensor number capable of multiplexing in the WDFDM system is the product of the number of WDM and FDM independently so as to increase the multiplex efficiency greatly and obtain accurate test value.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensors, and in particular relates to a multiplexing system of optical fiber F-P sensor. technical background [0002] At present, in the optical fiber intelligent structure, the optical fiber Fabry-Perot (Fabry-Perot) sensor is a more successful application. The basic structure of the fiber optic Fab sensor is as follows: Figure 4 As shown, it is mainly composed of a capillary quartz glass tube and a light introduction / reflection single-mode optical fiber, wherein the end faces of the two optical fibers are placed parallel to each other, and at both ends of the quartz tube, the optical fiber and the quartz tube are bonded together with glue. Under normal circumstances, the reflectivity of the two fiber end faces in the fiber optic sensor is equal, and the reflective fiber is not coated, and its reflectivity is small; The structure with high reflectivity and unequal reflectivity, we call t...

AI Technical Summary

Problems solved by technology

The optical fiber Fizeau sensor space frequency division multiplexing system made by the above method has a simple structure and high measurement accuracy, but due to the crosstalk between the sensors, the difference between the cavity lengths of any two sensors must be greater than a certain value (about 600-800 microns ), so due to the limitation of cavity length and cavity length difference, the number of sensors that can be reused is still only a dozen, which is far from meeting the requirements of large-scale application of sensors, and a more efficient multiplexing system is needed

[0009] It can be seen that the common fiber-optic sensor multiplexing systems have a low number of multiplexing, which cannot meet the requirements of practical applications; some fiber-optic sensor multiplexing systems also have the disadvantages of low measurement accuracy, complex equipment or high cost

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