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Method for controlling FBG wavelength based on double-grating structure

A technology of structure control and double grating, which is used in optical waveguides, light guides, optics, etc.

Pending Publication Date: 2019-10-18
FUZHOU PHOTOP QPTICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] With the continuous improvement of the performance requirements of FBG, the requirements for wavelength are also more precise, and the optical fiber grating produced by the phase mask method is usually controlled by adjusting the pretension tension. Generally, the deviation range of the control wavelength is ±0.25nm , if it is a high-power FBG, the range of controlled wavelength deviation will be larger; but in fact, the writing time is also an important factor affecting the wavelength

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  • Method for controlling FBG wavelength based on double-grating structure
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  • Method for controlling FBG wavelength based on double-grating structure

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Embodiment Construction

[0030] Such as Figure 1-3 As shown in one of them, the present invention discloses a method for controlling the wavelength of FBG based on a double grating structure. The writing device used includes a laser 101, a shaping optical path 102, a phase mask 103, two grating writing machines 104 and an online monitoring system. 105. The laser light emitted by the laser 101 is sequentially output to two grating writing machines through the shaping optical path 102 and the phase mask 103, wherein one grating writing platform is a pre-writing machine, and the other is an actual writing machine. The two grating writing platforms The machine 104 includes a tension control device 107, which is used to provide an adjustable tension acting on the writing optical fiber. After the fiber grating is fixed, the tension control device 107 can test the tension, and it can also be adjusted by the adjustment knob. The size of the pulling force. Two grating writing machines are connected with onli...

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Abstract

The invention discloses a method for controlling the FBG wavelength based on a double-grating structure. A fiber grating is inscribed in advance on a pre-inscribing machine bench; and a certain difference exists between the grating index and an actually required wavelength but is within a detection range of the broadband light source. The pre-inscribed grating is placed on an actual inscribing platform, wherein the main inscribing location avoids the pre-inscribing grating; after a tensile force is applied, the changing condition of the pre-inscribed grating is detected to determine whether the applied tensile force is corrected; and then normal inscribing is performed. According to the invention, one fiber grating having the same inscribing time and different wavelength is inscribed in advance; and then the tensile force is controlled accurately by controlling the wavelength changing condition of the pre-inscribed grating, so that the wavelength is controlled accurately.

Description

technical field [0001] The invention relates to the technical field of writing optical fiber gratings, in particular to a method for controlling FBG wavelength based on a double grating structure. Background technique [0002] In 1978, K.O.Hill and others first discovered that the refractive index of germanium (Ge) optical fiber can undergo periodic permanent changes under the irradiation of light of certain wavelengths, and people soon realized that this characteristic can be used to make optical fibers in optical fibers Grating, which became the starting point of fiber grating research. In 1989, G.Meltz and others used holographic interferometry for the first time to produce the first fiber Bragg grating whose Bragg resonance wavelength was in the communication band, which has promoted the tremendous development of fiber Bragg grating ever since. At present, fiber gratings have caused revolutionary changes in the fields of optical fiber communication and optical fiber sen...

Claims

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Application Information

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IPC IPC(8): G02B6/02
CPCG02B6/02138
Inventor 郑彬林磊蔡光明余忠伟
Owner FUZHOU PHOTOP QPTICS CO LTD
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