Method for accurately measuring reflectivity of fiber Bragg grating

A fiber grating and precise measurement technology, applied in the direction of testing optical performance, etc., can solve the problem of large error of fiber grating, achieve accurate measurement, high measurement accuracy, and improve the effect of measurement accuracy

Inactive Publication Date: 2012-12-19
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for accurately measuring the reflectivity of fiber gratings, which uses the wave

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  • Method for accurately measuring reflectivity of fiber Bragg grating

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Embodiment Construction

[0013] The preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to describe the technical solution of the present invention in detail.

[0014] The invention measures the reflection spectrum curve of the fiber grating through the wavelength scanning of the tunable laser, and then calculates the magnitude of the reflectivity. Such as figure 1 As shown, the method for accurately measuring the reflectivity of fiber gratings in the present invention uses tunable lasers, isolators, circulators, and power meters, wherein the tunable lasers are used to provide scanning signals in a certain wavelength range, and the isolators are used to prevent reflected light in the optical path It affects the output of the tunable laser, the circulator is used to separate the forward tunable laser input light from the reverse fiber Bragg grating reflected light signal, and the power meter is used to receive the fiber Bragg grating reflected li...

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Abstract

The invention discloses a method for accurately measuring reflectivity of fiber Bragg grating. The method for accurately measuring reflectivity of fiber Bragg grating uses a tunable laser and the like and includes the following steps of accessing standard reflection load with known reflectivity and almost total reflection, wavelength scanning is achieved through the tunable laser and a separator, and a power meter records a spectral curve of fiber Bragg grating to be measured; compared data of the fiber Bragg grating with data of the spectral curve, and a longitudinal horizontal coordinate corresponding to a peak point is reflectivity. The wavelength scanning method is used to measure a reflection spectrum curve of fiber Bragg grating, reflectivity is further calculated, and the problem that error is large when low reflectivity fiber Bragg grating is measured by an existing method is solved.

Description

technical field [0001] The invention relates to a measurement method, in particular to a method for accurately measuring the reflectivity of an optical fiber grating. Background technique [0002] Fiber Bragg Grating is a kind of fiber optic device that forms a permanent periodic change in the refractive index in the fiber core through a certain method. Its basic function is to reflect or lose the transmission of light of certain wavelengths. In the fiber grating, the distribution law of the refractive index reflects the structural parameters such as the period and modulation depth of the fiber grating. Fiber Bragg Grating devices are widely used in fiber optic sensing, fiber optic communication, fiber laser and other fields. In these applications, reflectivity is an important parameter to characterize the performance index of fiber Bragg grating, and the accurate measurement of its magnitude is very important for the design and application of fiber Bragg grating devices. ...

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Application Information

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IPC IPC(8): G01M11/02
Inventor 赵耀韩正英高业胜李国超
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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