阅读说明：本技术 光纤夹持机构及光纤参数测试设备的校准方法 (Optical fiber clamping mechanism and calibration method of optical fiber parameter testing equipment ) 是由 及少勇 金彦 龚江疆 张�成 于 2019-11-14 设计创作，主要内容包括：本发明提供一种光纤夹持机构及光纤参数测试设备的校准方法,包括：支座,支座上设有导向孔,导向孔贯通支座的前端和后端；支座的顶部设有定位通孔；支座的侧面设有导向通道；定位通孔通过中间通道与导向通道的前端连通,形成工作通道；套筒穿入于导向孔中,套筒上设有中间通孔；夹紧部件安装于中间通孔中,夹紧部件处于中间通孔的前端；夹紧部件上设有夹紧孔道；主体把手插入于工作通道中；主体把手的一端处于支座的外部,主体把手的另一端与套筒连接。本光纤夹持机构能够对所夹住的光纤进行保护,避免光纤的端面长时间露出所造成的损伤；本发明的校准方法,使得校准更快捷、更方便,最大程度地避免拆卸仪器导致不必要的误差。(The invention provides a calibration method of an optical fiber clamping mechanism and optical fiber parameter testing equipment, which comprises the following steps: the support is provided with a guide hole, and the guide hole penetrates through the front end and the rear end of the support; the top of the support is provided with a positioning through hole; a guide channel is arranged on the side surface of the support; the positioning through hole is communicated with the front end of the guide channel through the middle channel to form a working channel; the sleeve penetrates into the guide hole, and a middle through hole is formed in the sleeve; the clamping component is arranged in the middle through hole and is positioned at the front end of the middle through hole; the clamping component is provided with a clamping pore channel; the main body handle is inserted into the working channel; one end of the main body handle is positioned outside the support, and the other end of the main body handle is connected with the sleeve. The optical fiber clamping mechanism can protect the clamped optical fiber and avoid the damage caused by long-time exposure of the end face of the optical fiber; the calibration method of the invention has the advantages of quicker and more convenient calibration and avoids unnecessary errors caused by disassembling the instrument to the maximum extent.)

1. A fiber clamping mechanism, comprising: a support (100), a sleeve (200), a clamping component (300) and a main body handle (400);

the support (100) is provided with a guide hole (110), the guide hole (110) is arranged along the horizontal direction, the guide hole (110) penetrates through the front end and the rear end of the support (100), and the cross section of the guide hole (110) is cylindrical;

a positioning through hole (120) is formed in the top of the support (100), and the central axis of the positioning through hole (120) is perpendicular to the horizontal direction;

a guide channel (130) is arranged on the side surface of the support (100), and the length direction of the guide channel (130) is parallel to the horizontal direction; the positioning through hole (120) is communicated with the front end of the guide channel (130) through an intermediate channel (160) to form a working channel (140), and the working channel (140) is communicated with the guide hole (110);

the sleeve (200) penetrates into the guide hole (110), the sleeve (200) is in clearance fit with the guide hole (110), a middle through hole (210) is formed in the sleeve (200), and the middle through hole (210) and the guide hole (110) are coaxially arranged;

the clamping member (300) is mounted in the middle through hole (210), and the clamping member (300) is arranged at the front end of the middle through hole (210); a clamping pore passage (310) is formed in the clamping component (300), and the clamping pore passage (310) and the middle through hole (210) are coaxially arranged;

the main body handle (400) is inserted into the working channel (140) and is movable in the working channel (140); one end of the main body handle (400) is positioned outside the support (100), and the other end of the main body handle (400) is connected with the sleeve (200).

2. The fiber clamping mechanism of claim 1, wherein: the device also comprises a pressing block (500) and a spring (600); the pressing block (500) is mounted at the rear end of the sleeve (200), the rear end of the sleeve (200) penetrates out of the rear end of the support (100), a supporting surface (510) is arranged on the pressing block (500), the supporting surface (510) of the pressing block (500) is in contact with the rear end face (220) of the sleeve (200), and the size of the supporting surface (510) of the pressing block (500) is larger than that of the rear end face (220) of the sleeve (200);

the spring (600) is sleeved on the sleeve (200), and the spring (600) is clamped between the supporting surface (510) of the pressing block (500) and the rear end face of the support (100).

3. The fiber clamping mechanism of claim 1, wherein: further comprising a clamping sheath (700);

the clamping sheath (700) is inserted into the front end of the guide hole (110), a receiving hole (710) for inserting the clamping component (300) is formed in the rear end of the clamping sheath (700), and the rear end of the clamping sheath (700) is connected with the front end of the sleeve (200); the outer side surface of the clamping sheath (700) is cylindrical, and the central axis of the bearing hole (710) is collinear with the central axis of the middle through hole (210).

4. The fiber clamping mechanism of claim 3, wherein:

the clamping component (300) is of a cylindrical structure;

the front end surface of the clamping component (300) is provided with at least two front openings (320), and all the front openings (320) are uniformly arranged along the circumferential direction of the outer side surface of the clamping component (300); each of the front openings (320) communicating with the clamping porthole (310);

the rear end face of the clamping component (300) is provided with at least two rear openings (330), and all the rear openings (330) are uniformly arranged along the circumferential direction of the outer side face of the clamping component (300); each of the rear openings (330) communicates with the clamping aperture (310).

5. The fiber clamping mechanism of claim 4, wherein: the front end face and the rear end face of the clamping component (300) are provided with inclined parts (340).

6. The fiber clamping mechanism of claim 1, wherein: is arranged outside the optical fiber parameter testing equipment (900); a clamp base (910) is arranged at the rear part of the optical fiber parameter testing equipment (900);

the optical fiber clamping mechanism further comprises a regulating sheet (810) and a regulating fastener (820), a long hole (811) is formed in the regulating sheet (810), and the length direction of the long hole (811) is perpendicular to the axial direction of the guide hole (110);

the tab (810) is mounted on the clamp base (910); the support (100) is provided with a mounting hole (150);

the adjusting fastener (820) passes through the long hole (811) and the mounting hole (150) in sequence to connect the adjusting sheet (810) with the support (100).

7. A calibration method of optical fiber parameter testing equipment is characterized by comprising the following steps:

1) preparing in advance: -providing the fiber clamping mechanism of any one of claims 1-5 outside of the fiber parameter testing device (900), the fiber clamping mechanism being mounted on a clamp base (910); loading the metered optical fiber (10) into a clamping channel (310) of a clamping member (300) of the fiber clamping mechanism; cutting the front end face of the metered optical fiber (10); stripping the protective jacket outside the front end of the metered optical fiber (10) to form a bare optical fiber; the bare optical fiber penetrates out of the front end of the clamping pore channel (310); pushing a main body handle (400), wherein the main body handle (400) drives a sleeve (200) to move forwards in a working channel (140) until the main body handle (400) moves into the positioning through hole (120), so that the bare optical fiber penetrates out of a support (100) of the optical fiber clamping mechanism, and the front end of the bare optical fiber penetrates into a diffuse reflector (920) of an optical fiber parameter testing device (900);

2) obtaining the profile of the outer edge of the bare fiber: light emitted by a background light source of the optical fiber parameter testing equipment (900) is reflected through a coating on a diffuse reflector (920), so that the light is uniformly irradiated onto the bare optical fiber, and an image of the bare optical fiber is mapped onto a camera device (940) of the optical fiber parameter testing equipment (900); the image pickup device (940) filters and processes the acquired outline of the outer edge of the bare fiber through an image processing algorithm, and the optical fiber parameter testing equipment (900) obtains a measured diameter value of the outline of the outer edge of the bare fiber;

3) calibration metrology and measurement phase difference data: the controller obtains a difference ratio of the metering diameter value of the bare fiber and the measured diameter value of the bare fiber;

4) detaching the optical fiber clamping mechanism: pushing a main body handle (400), wherein the main body handle (400) drives a sleeve (200) to move backwards in a working channel (140) until the main body handle (400) moves to the rear end of the guide channel (130), so that the bare optical fiber is received in the support (100); the fiber clamping mechanism is then removed.

Technical Field

The invention relates to the technical field of test equipment, in particular to an optical fiber clamping mechanism and a calibration method of optical fiber parameter test equipment.

Background

With the rapid spread of the internet and the increasing transmission capability of trunk cable networks, optical fiber access networks have become one of the key points in the development of optical communications in the world today. As communication technologies are continuously upgraded, the performance requirements for optical fibers are continuously increased. China is the fastest-developing optical fiber communication market in the world, and a plurality of optical fiber plants have been invested and constructed successively. As the optical fiber manufacturing technology in China is in the starting stage, different manufacturers controlled by the manufacturing process and the flow are not nearly the same. Therefore, the quality inspection of the optical fiber becomes a very urgent task, wherein the geometric parameters of the optical fiber become one of the main test contents; before the optical fiber is subjected to quality detection, the measured standard optical fiber needs to be installed on a clamp outside the detection equipment, so that the standard optical fiber penetrates into a diffuse reflector of the detection equipment to calibrate the detection equipment. The end face of the optical fiber is easy to damage, so that the end face of the optical fiber needs to be cut every time the detection equipment is calibrated; since the optical fiber is inevitably uneven in the process of reproducing the optical fiber, the end face of the re-cut optical fiber is not the end face of the original measurement, which inevitably causes the generation of calibration error.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a fiber clamping mechanism and a calibration method of fiber parameter testing equipment.

In order to solve the above technical problem, the present invention provides an optical fiber holding mechanism, including: the clamping device comprises a support, a sleeve, a clamping part and a main body handle;

the support is provided with a guide hole, the guide hole is arranged along the horizontal direction, the guide hole penetrates through the front end and the rear end of the support, and the cross section of the guide hole is cylindrical; the top of the support is provided with a positioning through hole, and the central axis of the positioning through hole is vertical to the horizontal direction;

a guide channel is arranged on the side surface of the support, and the length direction of the guide channel is parallel to the horizontal direction; the positioning through hole is communicated with the front end of the guide channel through a middle channel to form a working channel, and the working channel is communicated with the guide hole;

the sleeve penetrates into the guide hole, the sleeve is in clearance fit with the guide hole, a middle through hole is formed in the sleeve, and the middle through hole and the guide hole are coaxially arranged;

the clamping component is arranged in the middle through hole and is positioned at the front end of the middle through hole; the clamping component is provided with a clamping pore passage, and the clamping pore passage and the middle through hole are coaxially arranged;

the main body handle is inserted into the working channel and can move in the working channel; one end of the main body handle is positioned outside the support, and the other end of the main body handle is connected with the sleeve.

Preferably, the optical fiber clamping mechanism further comprises a pressing block and a spring; the pressing block is arranged at the rear end of the sleeve, the rear end of the sleeve penetrates out of the rear end of the support, a supporting surface is arranged on the pressing block, the supporting surface of the pressing block is in contact with the rear end face of the sleeve, and the size of the supporting surface of the pressing block is larger than that of the rear end face of the sleeve; the spring is sleeved on the sleeve, and the spring is clamped between the supporting surface of the pressing block and the rear end face of the support.

Preferably, the optical fiber clamping mechanism further comprises a clamping sheath; the clamping sheath is inserted into the front end of the guide hole, a bearing hole for the clamping component to be inserted is formed in the rear end of the clamping sheath, and the rear end of the clamping sheath is connected with the front end of the sleeve; the outer side surface of the clamping sheath is cylindrical, and the central axis of the bearing hole is collinear with the central axis of the middle through hole.

Further, the clamping component is of a cylindrical structure; the front end surface of the clamping component is provided with at least two front openings, and all the front openings are uniformly arranged along the circumferential direction of the outer side surface of the clamping component; each of the front openings is in communication with the clamping aperture; the rear end surface of the clamping component is provided with at least two rear openings, and all the rear openings are uniformly arranged along the circumferential direction of the outer side surface of the clamping component; each of the rear openings communicates with the clamping bore.

Further, the front end surface and the rear end surface of the clamping member are each provided with an inclined portion.

Preferably, the optical fiber clamping mechanism is arranged outside the optical fiber parameter testing equipment; the rear part of the optical fiber parameter testing equipment is provided with a clamp base; the optical fiber clamping mechanism further comprises an adjusting sheet and an adjusting fastener, wherein the adjusting sheet is provided with a long hole, and the length direction of the long hole is vertical to the axial direction of the guide hole; the adjusting sheet is arranged on the clamp base; the support is provided with a mounting hole; the adjusting fastener sequentially penetrates through the strip hole and the mounting hole to connect the adjusting sheet with the support.

The invention also relates to a calibration method of the optical fiber parameter testing equipment, which comprises the following steps:

1) preparing in advance: arranging the optical fiber clamping mechanism outside the optical fiber parameter testing equipment, wherein the optical fiber clamping mechanism is arranged on a clamp base; loading the metered optical fiber into a clamping bore of a clamping member of the fiber clamping mechanism; cutting the front end face of the metered optical fiber; stripping the protective sleeve outside the front end of the metered optical fiber to form a bare optical fiber; the bare optical fiber penetrates out of the front end of the clamping pore channel; pushing a main body handle, wherein the main body handle drives a sleeve to move forwards in a working channel until the main body handle moves into the positioning through hole, so that the bare fiber penetrates out of a support of the optical fiber clamping mechanism, and the front end of the bare fiber penetrates into a diffuse reflector of the optical fiber parameter testing equipment;

2) obtaining the profile of the outer edge of the bare fiber: light emitted by a background light source of the optical fiber parameter testing equipment is reflected through a coating on a diffuse reflector, so that the light is uniformly irradiated onto the bare optical fiber, and an image of the bare optical fiber is mapped onto a camera device of the optical fiber parameter testing equipment; the image pickup device filters and processes the acquired outline of the outer edge of the bare fiber through an image processing algorithm, and the optical fiber parameter testing equipment obtains a measured diameter value of the outline of the outer edge of the bare fiber;

3) calibration metrology and measurement phase difference data: the controller obtains a difference ratio of the metering diameter value of the bare fiber and the measured diameter value of the bare fiber;

4) detaching the optical fiber clamping mechanism: pushing a main body handle, wherein the main body handle drives a sleeve to move backwards in a working channel until the main body handle moves to the rear end of the guide channel, so that the bare fiber is collected into the support; the fiber clamping mechanism is then removed.

As described above, the calibration method of the optical fiber clamping mechanism and the optical fiber parameter testing device of the present invention has the following advantages:

1) when the optical fiber clamping mechanism is used, the sleeve is in clearance fit with the guide hole, so that the main body handle can drive the sleeve to rotate in the guide hole; the clamping pore of the clamping component can clamp the optical fiber; the main body handle is inserted into the working channel, one end of the main body handle is positioned outside the support, and the other end of the main body handle is connected with the sleeve, so that a worker can pull the main body handle to move in the working channel; when the main body handle drives the sleeve to move forwards in the working channel and moves into the positioning through hole, the bare fiber can penetrate out of the support of the optical fiber clamping mechanism, and the front end of the bare fiber can penetrate into optical fiber parameter testing equipment, so that the optical fiber parameter testing equipment can obtain parameters of the end face of the optical fiber, and the optical fiber parameter testing equipment can be calibrated; after the calibration of the optical fiber parameter testing equipment is completed, the main body handle drives the sleeve to move backwards in the working channel until the main body handle moves to the rear end of the guide channel, so that the optical fiber is collected into the support;

2) according to the optical fiber clamping mechanism, the optical fiber can be collected into the support by moving the main body handle to the rear end of the guide channel; when the optical fiber parameter testing equipment needs to be calibrated, the optical fiber can penetrate out of the support by moving the main body handle into the positioning through hole; the optical fiber clamping mechanism can protect the clamped optical fiber, avoid the damage caused by long-time exposure of the end face of the optical fiber and avoid cutting the end face of the optical fiber during each calibration;

3) the calibration method of the optical fiber parameter testing equipment can ensure that the shell of the optical fiber parameter testing equipment is not required to be disassembled, so that the calibration is quicker and more convenient, and unnecessary errors caused by disassembling an instrument are avoided to the greatest extent.

Drawings

FIG. 1 is a perspective view of the main body handle of the fiber clamping mechanism of this embodiment moving into the positioning through hole of the holder.

FIG. 2 is a bottom view of the holder of the fiber clamping mechanism of this embodiment.

FIG. 3 is a schematic diagram of the optical fiber clamping mechanism of this embodiment with the holder mounted on the base of the clamp.

FIG. 4 is a schematic cross-sectional view of the fiber holding mechanism of this embodiment when the main body handle is moved into the positioning hole of the holder.

FIG. 5 is a perspective view of the fiber clamping mechanism of this embodiment without a spring and with the main body handle moving to the rear end of the guide channel.

FIG. 6 is a perspective view of the fiber clamping mechanism of this embodiment without a spring and with the main body handle moving into the positioning hole of the holder.

FIG. 7 is a schematic diagram of the structure of the fiber clamping mechanism of the present embodiment for inserting the optical fiber into the fiber parameter testing device.

FIG. 8 is a perspective view of the holder of the fiber clamping mechanism of this embodiment.

FIG. 9 is a bottom view of the holder of the fiber clamping mechanism of this embodiment.

FIG. 10 is a cross-sectional view of the ferrule of the fiber clamping mechanism of the present embodiment.

FIG. 11 is a cross-sectional view of the clamping sheath of the optical fiber clamping mechanism of the present embodiment.

FIG. 12 is a side view schematically showing the structure of the clamping member of the fiber clamping mechanism according to this embodiment.

FIG. 13 is a schematic view showing the end face structure of the clamping member of the fiber holding mechanism according to this embodiment.

FIG. 14 is a schematic diagram of a tab of the fiber clamping mechanism according to the present embodiment.

Description of the reference numerals

10 optical fiber

100 support

110 guide hole

120 positioning through hole

130 guide channel

140 working channel

150 mounting hole

160 intermediate channel

200 sleeve

210 middle via

220 rear end face of sleeve

300 clamping part

310 clamping tunnel

320 front opening

330 rear opening

340 inclined part

400 main body handle

500 briquetting

510 bearing surface

600 spring

700 clamping sheath

710 receiving hole

810 adjustment sheet

811 long hole

820 adjustable fastener

900 optical fiber parameter testing equipment

910 clamp base

920 Diffuse reflector

940 image pickup device

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to the attached drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

As shown in fig. 1 to 14, the fiber holding mechanism of the present embodiment includes: a holder 100, a sleeve 200, a clamping member 300, and a body handle 400;

a guide hole 110 is formed in the support 100, the guide hole 110 is arranged along the horizontal direction, the guide hole 110 penetrates through the front end and the rear end of the support 100, and the cross section of the guide hole 110 is cylindrical; a positioning through hole 120 is formed in the top of the support 100, and the central axis of the positioning through hole 120 is perpendicular to the horizontal direction;

a guide channel 130 is arranged on the side surface of the support 100, and the length direction of the guide channel 130 is parallel to the horizontal direction; the positioning through-hole 120 communicates with the front end of the guide passage 130 through the intermediate passage 160 to form a working passage 140, and the working passage 140 communicates with the guide hole 110;

the sleeve 200 penetrates into the guide hole 110, the sleeve 200 is in clearance fit with the guide hole 110, a middle through hole 210 is formed in the sleeve 200, and the middle through hole 210 and the guide hole 110 are coaxially arranged;

the clamping member 300 is installed in the middle through hole 210, and the clamping member 300 is located at the front end of the middle through hole 210; the clamping component 300 is provided with a clamping hole 310, and the clamping hole 310 is coaxially arranged with the middle through hole 210;

body handle 400 is inserted into working channel 140 and is movable in working channel 140; one end of the main body handle 400 is positioned outside the holder 100, and the other end of the main body handle 400 is connected to the sleeve 200.

When the optical fiber clamping mechanism is used, the sleeve 200 is in clearance fit with the guide hole 110, so that the main body handle 400 can drive the sleeve 200 to rotate in the guide hole 110; the clamping aperture 310 of the clamping member 300 is capable of clamping the optical fiber 10; the main body handle 400 is inserted into the working channel 140, one end of the main body handle 400 is positioned outside the support 100, and the other end of the main body handle 400 is connected with the sleeve 200, so that a worker can pull the main body handle 400 to move in the working channel 140; when the main body handle 400 drives the sleeve 200 to move forward in the working channel 140 and the main body handle 400 moves into the positioning through hole 120, the bare fiber can penetrate out of the support 100 of the optical fiber clamping mechanism, and the front end of the bare fiber can penetrate into the optical fiber parameter testing device 900, so that the optical fiber parameter testing device 900 can obtain the parameters of the end surface of the optical fiber 10, and the calibration of the optical fiber parameter testing device 900 can be realized; after the calibration of the optical fiber parameter testing apparatus 900 is completed, the main body handle 400 drives the sleeve 200 to move backward in the working channel 140 until the main body handle 400 moves to the rear end of the guide channel 130, so that the optical fiber 10 is received in the holder 100;

the optical fiber clamping mechanism of the present invention can make the optical fiber 10 be received in the holder 100 by moving the main body handle 400 to the rear end of the guide channel 130, so that the optical fiber 10 can be protected when not in use; when the optical fiber parameter testing device 900 needs to be calibrated first, the optical fiber 10 can penetrate out of the support 100 by moving the main body handle 400 into the positioning through hole 120; the optical fiber clamping mechanism can protect the clamped optical fiber 10, avoid damage caused by long-time exposure of the end face of the optical fiber 10 and avoid re-cutting the end face of the optical fiber 10 during each calibration.

In this embodiment, the dimensions of the gripping aperture 310 of the gripping member 300 correspond to the dimensions of the optical fiber 10 to be gripped.

The optical fiber clamping mechanism further comprises a pressing block 500 and a spring 600; the pressing block 500 is arranged at the rear end of the sleeve 200, the rear end of the sleeve 200 penetrates out of the rear end of the support 100, a supporting surface 510 is arranged on the pressing block 500, the supporting surface 510 of the pressing block 500 is in contact with the rear end face 220 of the sleeve 200, and the size of the supporting surface 510 of the pressing block 500 is larger than that of the rear end face 220 of the sleeve 200; the spring 600 is sleeved on the sleeve 200, and the spring 600 is clamped between the supporting surface 510 of the pressing block 500 and the rear end surface of the support 100.

When the main body handle 400 moves to the rear end of the guide passage 130, the sleeve 200 moves backward along with the main body handle 400, and the spring 600 is in an uncontracted state; when the main body handle 400 is moved into the positioning through hole 120, the sleeve 200 moves forward along with the main body handle 400, and the spring 600 is in a contracted state. When the optical fiber parameter testing apparatus 900 obtains the parameters of the end surface of the optical fiber 10 and moves the main body handle 400 to the rear end of the guide passage 130, the main body handle 400 can be quickly moved to the rear end of the guide passage 130 due to the restoring force of the spring 600.

The optical fiber clamping mechanism further comprises a clamping sheath 700; the clamping sheath 700 is inserted into the front end of the guide hole 110, the rear end of the clamping sheath 700 is provided with a receiving hole 710 for inserting the clamping component 300, and the rear end of the clamping sheath 700 is connected with the front end of the sleeve 200; the outer side of the clamping sheath 700 is cylindrical, and the central axis of the receiving hole 710 is collinear with the central axis of the middle through hole 210. The clamping sheath 700 can clamp the front end of the clamping member 300.

The clamping member 300 is a cylindrical structure; the front end surface of the clamping component 300 is provided with at least two front openings 320, and all the front openings 320 are uniformly arranged along the circumferential direction of the outer side surface of the clamping component 300; each front opening 320 communicates with the clamping aperture 310; the rear end surface of the clamping member 300 is provided with at least two rear openings 330, and all the rear openings 330 are uniformly arranged along the circumferential direction of the outer side surface of the clamping member 300; each rear opening 330 communicates with the clamping aperture 310. The provision of the front and rear openings 320 and 330 of the clamping member 300 facilitates the insertion of the optical fiber 10 into the clamping aperture 310 when the clamping member 300 is not installed in the intermediate through-hole 210 and is not clamped by the clamping sheath 700.

The clamping member 300 is provided with inclined portions 340 on both front and rear end surfaces. The provision of the inclined portion 340 can facilitate the installation of the clamping member 300 in the intermediate through-hole 210 and the clamping of the clamping member 300 by the clamping sheath 700.

The optical fiber clamping mechanism is arranged outside the optical fiber parameter testing equipment 900; the rear part of the optical fiber parameter testing device 900 is provided with a clamp base 910; the optical fiber clamping mechanism further comprises a adjusting sheet 810 and an adjusting fastener 820, wherein the adjusting sheet 810 is provided with a long hole 811, and the length direction of the long hole 811 is vertical to the axial direction of the guide hole 110; the tab 810 is mounted on the clamp base 910; the support 100 is provided with a mounting hole 150; the adjustment fastener 820 passes through the elongated hole 811 and the mounting hole 150 in turn to connect the tab 810 with the holder 100. The arrangement of the tab 810 and the adjustment fastener 820 enables the position of the stand 100 in the left-right direction to be adjusted.

The invention also relates to a calibration method of the optical fiber parameter testing device 900, which comprises the following steps:

1) preparing in advance: arranging an optical fiber clamping mechanism outside the optical fiber parameter testing device 900, the optical fiber clamping mechanism being mounted on the clamp base 910; loading the metered optical fiber 10 into the gripping aperture 310 of the gripping member 300 of the fiber holding mechanism; cutting the front end face of the metered optical fiber 10; stripping the protective jacket outside the front end of the metered optical fiber 10 to form a bare optical fiber; the bare fiber penetrates the front end of the clamping hole 310; pushing the main body handle 400, the main body handle 400 drives the sleeve 200 to move forward in the working channel 140 until the main body handle 400 moves into the positioning through hole 120, so that the bare fiber penetrates out of the support 100 of the fiber clamping mechanism, and the front end of the bare fiber penetrates into the diffuse reflector 920 of the fiber parameter testing apparatus 900;

2) obtaining the profile of the outer edge of the bare fiber: light emitted by a background light source of the optical fiber parameter testing device 900 is reflected by a coating on the diffuse reflector 920, so that the light is uniformly irradiated onto the bare optical fiber, and an image of the bare optical fiber is mapped onto the camera 940 of the optical fiber parameter testing device 900; after the obtained outline of the outer edge of the bare fiber is filtered and processed by the camera 940 through an image processing algorithm, the fiber parameter testing equipment 900 obtains a measured diameter value of the outline of the outer edge of the bare fiber;

3) calibration metrology and measurement phase difference data: the controller obtains the difference proportion between the metering diameter value of the bare fiber and the measured diameter value of the bare fiber;

4) detaching the optical fiber clamping mechanism: pushing the main body handle 400, the main body handle 400 drives the sleeve 200 to move backward in the working channel 140 until the main body handle 400 moves to the rear end of the guide channel 130, so that the bare fiber is received in the holder 100; the fiber clamping mechanism is then removed.

The calibration method of the optical fiber parameter testing equipment 900 of the invention can avoid disassembling the shell of the optical fiber parameter testing equipment 900, so that the calibration is quicker and more convenient, and unnecessary errors caused by disassembling the instrument can be avoided to the maximum extent.

In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.