Method and device for manufacturing low-loss micro-nanometer fiber bragg grating sensor in chemical corrosion method

Abstract

The invention relates to a method and a device for manufacturing a low-loss micro-nanometer fiber bragg grating sensor in a chemical corrosion method. The device comprises a broad-band light source, an optical fiber circulator, a 3-dB optical fiber coupler, a spectrograph, an optical power meter, a stepping motor, an optical fiber written with a bragg grating and a polytetrafluoroethylene container containing corrosion solution. The method and the device control the speed of the optical fiber written with bragg grating in corrosion mode so as to manufacture the sensor through an automatic control technique. An optical fiber gradual-changing area can be slowly transited to a micro-nanometer fiber part by slowly lifting the optical fiber so that refractive index changing gradient of the optical fiber gradual-changing area can be reduced. The method and the device for manufacturing the low-loss micro-nanometer fiber bragg grating sensor in the chemical corrosion method has the advantages of being high in accuracy, low in cost, good in anti-interference performance, simple and practical in structure, suitable for mass production and the like.

Description

technical field [0001] The invention belongs to the technical field of optoelectronic devices, and particularly relates to a method for realizing a low-loss micro-nano fiber grating sensor by using a stepping motor to precisely control the lifting speed of an optical fiber inscribed with a fiber grating in a chemical etching solution, and a method for realizing the method. device. Background technique [0002] The diameter of the micro-nano fiber is in the order of microns, which is equivalent to the wavelength of the communication band, and has a strong evanescent field and high optical power density. The light field transmitted by the micro-nano fiber has a strong light-matter effect and a long action distance with the surrounding sample to be tested, so it can realize high-sensitivity optical sensing. However, a single micro-nano fiber sensor is a transmissive light intensity modulation sensor based on the change of the detection light intensity caused by the change of t...

AI Technical Summary

Problems solved by technology

However, this technology illustrates the application capabilities of micro-nano fiber gratings in the field of sensing, but does not consider the large optical loss caused by the corrosion process.

It is known from experiments that this method cannot obtain very fine micro-nano fiber gratings, thus limiting the detection sensitivity of micro-nano fiber grating sensors; at the same time, the poor signal-to-noise ratio caused by large transmission loss will also seriously affect the micro-nano fiber gratings. Practical Detection Applications of Sensors

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