阅读说明：本技术 一种基于光纤内部微结构远场图案的保偏光纤对轴装置 (Polarization maintaining optical fiber counter shaft device based on optical fiber internal microstructure far-field pattern ) 是由 王璞 宋伟华 侯玉斌 张倩 王茜 于 2019-12-11 设计创作，主要内容包括：本发明公开了一种基于光纤内部微结构远场图案的保偏光纤对轴装置,主要由线激光器(1)、光纤角度调节平台(2)、金属平台(3)、接收屏(4)和光纤夹具(5)组成。利用线光源照射光纤侧面在远端显示光纤内部结构图案的原理,来进行保偏光纤对轴熔接。通过对两段相对放置的保偏光纤调节轴向角度,可以改变两段光纤快慢轴的角度,最终实现两段光纤快慢轴的对准。本发明利用线光源照射光纤侧面投射出光纤内部微结构远场图案的方法至今没有人用于保偏光纤的对轴,无需像市面上其他保偏光纤熔接机一样观察光纤侧面近场光强图案,从原理上来讲对轴方式不同且更为精确。本发明设计简单、结构紧凑,易于实现产业化。(The invention discloses a polarization maintaining optical fiber counter shaft device based on a far field pattern of an optical fiber internal microstructure, which mainly comprises a line laser (1), an optical fiber angle adjusting platform (2), a metal platform (3), a receiving screen (4) and an optical fiber clamp (5). The principle that the side face of the optical fiber is irradiated by a linear light source and the internal structure pattern of the optical fiber is displayed at the far end is utilized to perform polarization-maintaining optical fiber countershaft fusion. The angle of the fast and slow axes of the two segments of optical fibers can be changed by adjusting the axial angle of the two segments of polarization maintaining optical fibers which are oppositely arranged, and the alignment of the fast and slow axes of the two segments of optical fibers is finally realized. The method for projecting the optical fiber internal microstructure far-field pattern by irradiating the side surface of the optical fiber by using the line light source does not have a counter shaft used for the polarization maintaining optical fiber so far, does not need to observe the optical fiber side surface near-field light intensity pattern like other polarization maintaining optical fiber fusion splicers in the market, and has different and more accurate counter shaft modes in principle. The invention has simple design and compact structure, and is easy to realize industrialization.)

1. A polarization maintaining optical fiber countershaft device based on optical fiber internal microstructure far-field patterns is characterized in that:

the device comprises a line laser (1), an optical fiber angle adjusting platform (2), a metal platform (3), a receiving screen (4) and an optical fiber clamp (5);

fixing a metal platform (1) on an experiment operating platform, and symmetrically installing two optical fiber angle adjusting platforms (2) at two ends of the metal platform (3) to ensure that the distances from the two optical fiber angle adjusting platforms (2) to the center of the whole metal platform (3) are equal; respectively placing two optical fiber clamps (5) on the optical fiber angle adjusting platform (2), respectively placing two sections of optical fibers on the optical fiber clamps, adjusting the optical fiber angle adjusting platform (2) to a proper angle to enable the heights of the two sections of optical fibers to be consistent with the front, back, left and right distances, respectively placing the line laser (1) and the receiving screen (4) on two sides of the metal platform, and adjusting the heights to proper heights; and finishing the construction of the whole device.

2. The polarization-maintaining optical fiber countershaft apparatus according to claim 1, wherein said apparatus comprises:

when a power supply is switched on, the line laser (1) generates red line laser, and the line laser is manually adjusted to a horizontal angle to irradiate the side face of the optical fiber; the principle that the line light source irradiates the side face of the optical fiber and displays the internal structure pattern of the optical fiber at the far end is utilized, the internal structure pattern of the optical fiber can be observed on the receiving screen (4), the alignment of the polarization maintaining optical fiber speed axis is carried out by rotating the optical fiber clamp (5), and the speed axis of the optical fiber is aligned when the left part and the right part of patterns on the receiving screen (4) are the same.

3. The polarization-maintaining optical fiber countershaft apparatus according to claim 1, wherein said apparatus comprises: line laser (1): and providing a horizontal line light source for irradiating the internal microstructure of the polarization maintaining optical fiber.

4. The polarization-maintaining optical fiber countershaft apparatus according to claim 1, wherein said apparatus comprises: optical fiber angle adjusting platform (2): the height and the front, back, left and right distances of the optical fibers clamped on the optical fiber clamp are adjusted to ensure that the two optical fibers are strictly symmetrical.

5. The polarization-maintaining optical fiber countershaft apparatus according to claim 1, wherein said apparatus comprises: metal platform (3): the base of the whole device is used for ensuring the stability and the levelness of the whole device.

6. The polarization-maintaining optical fiber countershaft apparatus according to claim 1, wherein said apparatus comprises: fiber clamp (4): the optical fibers are clamped and rotated to realize two optical fiber pair shafts.

7. The polarization-maintaining optical fiber countershaft apparatus according to claim 1, wherein said apparatus comprises: receiving screen (5): for receiving the optical fiber internal microstructure pattern.

Technical Field

The invention discloses a polarization maintaining optical fiber countershaft device based on a micro-structure far-field pattern in an optical fiber.

Background

The polarization maintaining fiber has a special fiber structure, so that the polarization state of linearly polarized light is not changed when the linearly polarized light is transmitted in the fiber. In some optical fiber sensors, the linear polarization output of the polarization maintaining optical fiber can improve the signal-to-noise ratio of signals, and meanwhile, in industries such as optical fiber communication and laser manufacturing, the polarization maintaining optical fiber can reduce the influence of the external environment on the optical mode inside the optical fiber due to the linear polarization transmission advantage of the polarization maintaining optical fiber, so that the polarization maintaining optical fiber is widely concerned by people. However, since the polarization maintaining fiber has a fast axis and a slow axis inside, there are some problems in aligning the polarization maintaining fiber when the polarization maintaining fiber is fusion-spliced. For example: the problems of the accuracy of the optical fiber to the shaft, the uneven horizontal height of the optical fibers at two ends and the like all influence the loss after the optical fiber is welded.

Disclosure of Invention

The invention aims to design a polarization-maintaining optical fiber countershaft device based on a far-field pattern of an internal microstructure of an optical fiber, which utilizes the principle that a linear light source irradiates the side surface of the optical fiber and displays the internal structure pattern of the optical fiber at the far end to perform polarization-maintaining optical fiber countershaft fusion. The angle of the fast and slow axes of the two segments of optical fibers can be changed by adjusting the axial angle of the two segments of polarization maintaining optical fibers which are oppositely arranged, and the alignment of the fast and slow axes of the two segments of optical fibers is finally realized.

In order to realize the scheme design, the invention adopts the technical scheme that a polarization-maintaining optical fiber counter shaft device based on an optical fiber internal microstructure far-field pattern is designed, wherein the polarization-maintaining optical fiber counter shaft device mainly comprises a line laser (1), an optical fiber angle adjusting platform (2), a metal platform (3), a receiving screen (4) and an optical fiber clamp (5).

Fix metal platform (1) on the experiment operation panel, install two optic fibre angle modulation platforms (2) symmetry at the both ends of metal platform (3), guarantee that two optic fibre angle modulation platforms (2) apart from the distance all around of whole metal platform (3) central authorities equal. And then the two optical fiber clamps (5) are respectively placed on the optical fiber angle adjusting platform (2), two sections of optical fibers are respectively placed on the optical fiber clamps, the optical fiber angle adjusting platform (2) is adjusted to a proper angle, so that the heights of the two sections of optical fibers are consistent with the distances from front to back, left to right, the line laser (1) and the receiving screen (4) are respectively placed on two sides of the metal platform and adjusted to proper heights. And finishing the construction of the whole device.

When the power supply is switched on, the line laser (1) generates red line laser, and the line laser is manually adjusted to a horizontal angle to irradiate the side face of the optical fiber. The principle that the line light source irradiates the side face of the optical fiber and displays the internal structure pattern of the optical fiber at the far end is utilized, the internal structure pattern of the optical fiber can be observed on the receiving screen (4), the alignment of the polarization-maintaining optical fiber speed axis is carried out by rotating the optical fiber clamp (5), and the speed axis of the optical fiber is aligned when the left part and the right part of the pattern on the receiving screen (4) are the same.

Compared with the prior art, the invention has the following beneficial effects.

1. The method for projecting the optical fiber internal microstructure far-field pattern by irradiating the side surface of the optical fiber by using the line light source does not have a counter shaft used for the polarization maintaining optical fiber so far, does not need to observe the optical fiber side surface near-field light intensity pattern like other polarization maintaining optical fiber fusion splicers in the market, and has different and more accurate counter shaft modes in principle.

2. The invention can be matched with a non-polarization-maintaining optical fiber fusion splicer to replace a polarization-maintaining optical fiber fusion splicer, and can greatly reduce the cost of the polarization-maintaining optical fiber fusion splicer. The welding effect of the device matched with a non-polarization-maintaining welding machine is the same as that of a polarization-maintaining welding machine on the market.

3. The invention has simple design and compact structure, and is easy to realize industrialization.

Drawings

Fig. 1 is a schematic block diagram of a countershaft device of a polarization maintaining optical fiber fusion splicer in the market.

FIG. 2 is a diagram of an apparatus based on the far field pattern of the internal microstructure of an optical fiber

In the figure: 1. line laser, 2, optic fibre angle modulation platform, 3, metal platform, 4, receive screen, 5, optic fibre anchor clamps

Detailed Description

The present invention will be described in further detail with reference to the following drawings and examples.

Fig. 1 is a schematic block diagram of a coaxial device of a polarization maintaining optical fiber fusion splicer in the market, and the light source used in the common fusion splicer is a common white light source instead of a monochromatic light source. The white light source is projected at the position of the near field of the optical fiber on the other side of the side face of the optical fiber and about 2mm away from the side face of the optical fiber, after the projection is successful, a focusing lens for the projection of the near field presents light intensity stripes in a far field, and the fast and slow axes of the two sections of optical fibers can be adjusted to carry out axis alignment by rotating an optical fiber clamp in the fusion splicer. This on-axis approach utilizes intensity fringe matching, which has the disadvantage that the intensity fringe pattern is generated in relation to the distance of the receiving lens and the intensity sensor itself. Therefore, the matching precision of the welding mode is related to the precision of the detector, so that the current polarization-maintaining optical fiber welding machine often has the phenomenon of overlarge axial angle deviation, and the method for projecting the optical fiber internal microstructure far-field pattern by irradiating the side surface of the optical fiber by using the line light source has the axial precision only related to the position of the receiving screen from the metal platform, so long as the receiving screen can present a clear optical fiber internal microstructure far-field pattern, and the non-deviation axial alignment can be realized by manually or electrically rotating the optical fiber clamp.

FIG. 2 is a schematic diagram of the microstructure pattern based on the far field fiber interior. The pair shaft device consists of a line laser (1), an optical fiber angle adjusting platform (2), a metal platform (3), a receiving screen (4) and an optical fiber clamp (5). The metal platform (3) is fixed on the experiment table before the shaft aligning, the two optical fiber angle adjusting platforms (2) are symmetrically arranged on the metal platform (3), and the positions of the two optical fiber angle adjusting platforms (2) from the center of the metal platform (3) are the same. Two rotatable optical fiber clamps (4) are installed on the optical fiber angle adjusting platform (2), then two sections of optical fibers are placed on the optical fiber tool (5), and the optical fiber angle adjusting platform (2) is adjusted to enable the positions of the two sections of optical fibers to be horizontal and the front distance and the rear distance to be the same. The line laser (1) and the receiving screen (5) are placed on two sides of the metal platform (3), the heights of the line laser (1) and the receiving screen (5) are adjusted, and it is guaranteed that line laser is projected to the side face of an optical fiber and can receive the internal microstructure pattern of the optical fiber at the center of the receiving screen (5). The line laser (1) is turned on by switching on a power supply, the generated line laser horizontally irradiates the optical fiber, the projection pattern of the internal microstructure of the optical fiber can be observed on the receiving screen (4), and the alignment of the fast axis and the slow axis of the optical fiber can be realized by adjusting the angle of the optical fiber clamp (5).

The role of each device is as follows:

line laser (1): and providing a horizontal line light source for irradiating the internal microstructure of the polarization maintaining optical fiber.

Optical fiber angle adjusting platform (2): the height and the front, back, left and right distances of the optical fibers clamped on the optical fiber clamp are adjusted to ensure that the two optical fibers are strictly symmetrical.

Metal platform (3): the base of the whole device is used for ensuring the stability and the levelness of the whole device.

Fiber clamp (4): the optical fibers are clamped and rotated to realize two optical fiber pair shafts.

Receiving screen (5): for receiving the optical fiber internal microstructure pattern.