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Two-dimensional fiber bragg grating and preparing method thereof

A two-dimensional fiber and fiber grating technology, which is applied in cladding fibers, opto-mechanical equipment, optical waveguides and light guides.

Inactive Publication Date: 2010-07-14
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, multi-core fiber gratings have been studied, such as W.N.MacPherson, Meas.Sci.Technol.15, 1642, 2004 and US Patent No. 20070201793A1, but the multiple cores of the optical fiber are not in the same plane, and the distance between the cores is also Larger, no mutual coupling between cores

Method used

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  • Two-dimensional fiber bragg grating and preparing method thereof
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  • Two-dimensional fiber bragg grating and preparing method thereof

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Embodiment approach 1

[0030] An embodiment of the method for manufacturing a linear array multi-core optical fiber of the present invention specifically includes the following steps:

[0031] A circular fiber core and hollow and solid cladding preforms of different sizes are manufactured by chemical vapor deposition, and multiple core preforms 5 are arranged in a linear array. Set it outside the linear array to center the linear array, and fill other gaps with cladding preforms 6 of different sizes; or grind an appropriate large-sized cladding preform into a D-shaped cladding preform 8, two D-shaped cladding preforms The gaps between 8 are filled with the fiber core prefabricated rod 5; wire drawing is carried out by a conventional method. The linear array multi-core optical fiber shown in Fig. 4(c) will be drawn. Figure 4(a) and 4(b) Schematic illustration of the fabrication method for the linear array multicore fiber.

Embodiment approach 2

[0033] The embodiment of two-dimensional Bragg fiber grating manufacturing method of the present invention specifically comprises the following steps:

[0034] 1. Take a linear array multi-core optical fiber 13, the multiple cores have different photosensitivity, and strip the coating layer of the optical fiber with a length of 3-4cm;

[0035] 2. After cleaning, fix it on the optical fiber fixture, use a microscope to observe the position of each fiber core, and adjust the position of the optical fiber so that the phase mask 12 is close to the optical fiber 13, and the phase mask and the optical fiber are parallel to each other;

[0036] 3. Further make the plane of the fiber core parallel to the phase mask 12, the axis of the fiber is perpendicular to the line direction of the phase mask, and fix it after adjustment;

[0037] 4. One end of the optical fiber 13 is connected to a broadband light source by means of a beam splitter, and at the same time connected to a spectrum an...

Embodiment approach 3

[0042] The embodiment of the manufacturing method of the two-dimensional obliquely blazed fiber grating of the present invention specifically includes the following steps:

[0043] Same as 1-2 in Scheme 2;

[0044] Adjust the phase mask 12 to be close to the optical fiber 13, so that the optical fiber and the phase mask 12 are parallel to each other, and there is an angle between the reticles of the phase mask and the multi-core optical fiber; then proceed to steps 4-6 in Scheme 2;

[0045] Carry out encapsulation, complete two-dimensional tilted blazed fiber grating (see figure 2 ) production.

[0046] The two-dimensional tilted blaze prepared by this scheme has different photosensitivity for different cores, and the refractive index of each core changes differently. Because the grating is a blazed grating, the reflected light of each grating is easily coupled into the nearby core. The angle is the same, the reflected light does not return according to the original path, b...

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Abstract

The invention provides a two-dimensional fiber bragg grating and a preparing method thereof. The two-dimensional fiber bragg grating comprises optical fibers which consist of one group of fiber cores and optical fiber coatings. The fiber cores are intensively arranged into a linear array multi-core optical fiber in one plane. The optical fibers form a one-dimensional grating in the direction vertical to the axial direction of the optical fiber. Each fiber core writes the fiber bragg grating array in the same position. The gratings are related, respectively have the grating effect in two directions, and form a two-dimensional fiber bragg grating. The distance between the gratings is small, and the two-dimensional bragg grating can be used for equidirectional and reserve multi-wavelength selectors. Multiple fiber bragg gratings are integrated into one optical fiber, thereby enhancing the integration of the optical devices in the optical fiber and enhancing the property of the integrated devices. The two-dimensional fiber bragg grating can be used for the optical fiber sensor to sense more information.

Description

technical field [0001] The invention relates to a two-dimensional optical fiber grating structure. The invention also relates to a manufacturing method of a two-dimensional optical fiber grating. Background technique [0002] Fiber Grating (Fiber Grating) is an important class of fiber-optic devices based on the photosensitive properties of optical fibers. It plays an important role in the realization of functions such as optical filtering, optical coupling, optical amplification, and signal detection. A typical fiber grating is a single-fiber single-core structure. At present, the theoretical analysis and manufacturing process of single-core fiber gratings are quite mature, but it is difficult to guarantee the consistency of each fiber grating in distributed sensing and the integration level needs to be further improved. , and it is difficult to realize the simultaneous measurement of multiple physical quantities. The multi-core optical fiber contains a plurality of cores...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02G03F7/00
Inventor 苑立波关春颖戴强田凤军
Owner HARBIN ENG UNIV
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