阅读说明：本技术 一种光纤接头 (Optical fiber connector ) 是由 张航 陆建东 马慧玲 葛燕妮 朱瓒 陈利春 吴赟子 于 2019-11-22 设计创作，主要内容包括：一种光纤接头,属于光纤接头技术领域。光纤接头包括光纤陶瓷头、光纤套环、光纤连接螺纹套、弹簧、光纤尾套、适配器；所述弹簧用于套设在自光纤尾套伸出继而依次穿过光纤套环和光纤陶瓷头的光纤外；所述光纤连接螺纹套套设在所述光纤套环和所述光纤陶瓷头外,用于与适配器连接,使得所述弹簧作用于所述光纤尾套和所述光纤套环之间；所述光纤陶瓷头固定于光纤套环上。本发明可用于高功率光纤接头对接时减少接头挤压应力,使得接头通光不发生烧熔；增加光的表面透过率,提高耦合效率。(An optical fiber connector belongs to the technical field of optical fiber connectors. The optical fiber connector comprises an optical fiber ceramic head, an optical fiber sleeve ring, an optical fiber connecting threaded sleeve, a spring, an optical fiber tail sleeve and an adapter; the spring is used for sleeving the optical fiber extending out of the optical fiber tail sleeve and sequentially penetrating through the optical fiber sleeve ring and the optical fiber ceramic head; the optical fiber connecting threaded sleeve is sleeved outside the optical fiber ferrule and the optical fiber ceramic head and is used for being connected with an adapter, so that the spring acts between the optical fiber tail sleeve and the optical fiber ferrule; the optical fiber ceramic head is fixed on the optical fiber sleeve ring. The invention can be used for reducing the extrusion stress of the joint when the high-power optical fiber joint is butted, so that the light passing of the joint is not fused; the surface transmittance of light is increased, and the coupling efficiency is improved.)

1. An optical fiber connector is characterized by comprising an optical fiber ceramic head, an optical fiber sleeve ring, an optical fiber connecting threaded sleeve, a spring, an optical fiber tail sleeve and an adapter; the spring is used for sleeving the optical fiber extending out of the optical fiber tail sleeve and sequentially penetrating through the optical fiber sleeve ring and the optical fiber ceramic head; the optical fiber connecting threaded sleeve is sleeved outside the optical fiber ferrule and the optical fiber ceramic head and is used for being connected with an adapter, so that the spring acts between the optical fiber tail sleeve and the optical fiber ferrule; the optical fiber ceramic head is fixed on the optical fiber sleeve ring.

2. An optical fiber splice according to claim 1, wherein the spring has a spring rate of 1.698-2.548N/mm.

3. An optical fiber splice according to claim 1 wherein the length of said fiber-ceramic head is from 7.93 to 7.97 mm.

4. An optical fibre connector as claimed in claim 1, wherein the optical fibre ferrule comprises a ferrule body, a projection provided outside the ferrule body, and a catch provided outside the ferrule body on an end face of the projection facing the adapter.

5. An optical fibre splice according to claim 4 in which the adaptor comprises an outer housing, two inner ferrules located on opposite sides of the outer housing, an outer ferrule located outside the inner ferrules; the inner inserting tube is communicated with the inner shell; the inner inserting tube is used for inserting an optical fiber ceramic head, a space between the inner inserting tube and the outer inserting tube is used for accommodating the lantern ring body, and the lantern ring body is abutted to the bottom surface of the space between the inner inserting tube and the outer inserting tube; and the outer cannula is provided with a clamping groove matched with the card in a clamping manner.

6. An optical fiber splice according to claim 5, in which the outer casing has an elastomeric silicone sleeve with a pinhole opening corresponding to the inner ferrule.

7. An optical fiber splice according to claim 5 wherein the bottom surface of the space between said inner and outer sleeves is provided with an elastomeric silicone pad in contact with the ceramic head of the optical fiber.

8. An optical fibre splice according to claim 5 wherein an optical fibre matching fluid is contained within the outer housing.

9. An optical fibre splice according to claim 1, wherein the optical fibre splice is adapted for use in an FC, ST, SC, PC, APC, MT-RT splice.

10. An optical fiber splice according to claim 1, in which the endface of the fiber-optic ceramic ferrule is coated with an antireflection coating.

Technical Field

The invention relates to the technical field of optical fiber connectors, in particular to an optical fiber connector.

Background

The existing optical fiber connection is realized by adopting a movable connection mode. Firstly, determining the type of an optical fiber head, then customizing an optical fiber jumper wire with enough length to ensure that the types of the optical fiber heads at two ends are matched, and then adding an optical fiber adapter (also called an optical fiber coupler and a flange plate) to ensure that the optical fiber adapter is matched with the type of the optical fiber head.

The existing optical fiber connector has the following problems in the using process:

1. when the existing connector is in butt joint, the end face of the connector is extruded to generate certain stress when the optical fiber connection threaded sleeve is screwed down. When light is transmitted, high-power energy is gathered, so that a fiber core is burnt by high-power laser, and the fiber core cannot withstand repeated plugging and unplugging reloading

2. In the optical fiber butt joint operation process, grease on the hands of an operator and dust in the air can pollute the end face of the optical fiber.

3. Use the optic fibre adapter to make butt joint optic fibre expose in certain air for a long time, the surface can produce dust and pile up or humid air, all can make the loss of connection grow, produces the surface mar, and the fibre core can be stopped up when serious, can not transmit light, can lead to the fibre core to be burnt out by high power laser even when serious.

The utility model discloses a dual optical fiber connector CN201420337445.4, and specifically discloses a dual optical fiber connector comprising an optical fiber connector body and an optical fiber locking nut, which is characterized in that the optical fiber connector body and the optical fiber locking nut are connected through screw threads, two optical fiber jacks for fixing optical fibers are arranged inside the optical fiber connector body, and two sides of the head of the optical fiber connector body are provided with discrete clamping blocks; the optical fiber locking nut is characterized in that an inner conical surface is arranged inside the optical fiber locking nut, and when the optical fiber connector body is connected with the optical fiber locking nut, the clamping block is pressed by the inner conical surface to contract inwards to clamp the optical fiber in the optical fiber insertion hole. The optical fiber connector adopts a thread locking mode, and the extrusion stress of the connector is large when the optical fiber connector is in butt joint, so that the problem of fusing is easy to occur when the optical fiber connector passes through.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides the optical fiber connector which can be used for reducing the extrusion stress of the connector when the high-power optical fiber connector is butted, so that the connector is not burnt when light passes through the connector; the surface transmittance of light is increased, and the coupling efficiency is improved.

The invention is realized by the following technical scheme:

the invention provides an optical fiber connector, which comprises an optical fiber ceramic head, an optical fiber sleeve ring, an optical fiber connecting threaded sleeve, a spring and an optical fiber tail sleeve, wherein the optical fiber ceramic head is connected with the optical fiber sleeve ring through the optical fiber connecting threaded sleeve; the spring is used for sleeving the optical fiber extending out of the optical fiber tail sleeve and sequentially penetrating through the optical fiber sleeve ring and the optical fiber ceramic head; the optical fiber connecting threaded sleeve is sleeved outside the optical fiber ferrule and the optical fiber ceramic head and is used for being connected with an adapter, so that the spring acts between the optical fiber tail sleeve and the optical fiber ferrule; the optical fiber ceramic head is fixed on the optical fiber sleeve ring.

Preferably, the spring is a spring with the elastic coefficient of 1.698-2.548N/mm.

Preferably, the optical fiber ceramic head is 7.93-7.97 mm long.

Preferably, the optical fiber ferrule includes a ferrule body, a protrusion disposed outside the ferrule body, and a clip disposed outside the ferrule body and on an end face of the protrusion facing the adapter.

Preferably, the optical fiber connector further comprises an adapter; the adapter comprises an outer shell, two inner inserting pipes arranged on the opposite sides of the outer shell and an outer inserting pipe arranged on the outer side of the inner inserting pipes; the inner inserting tube is communicated with the inner shell; the inner inserting tube is used for inserting an optical fiber ceramic head, a space between the inner inserting tube and the outer inserting tube is used for accommodating the lantern ring body, and the lantern ring body is abutted to the bottom surface of the space between the inner inserting tube and the outer inserting tube; and the outer cannula is provided with a clamping groove matched with the card in a clamping manner.

Preferably, an elastic silica gel sleeve with a pinhole is arranged in the outer shell, and the opening of the pinhole corresponds to the inner insertion tube.

Preferably, an elastic silica gel pad in contact with the optical fiber ceramic head is arranged on the bottom surface of the space between the inner inserting tube and the outer inserting tube.

Preferably, the outer housing contains an optical fiber matching fluid.

Preferably, the optical fiber connector is suitable for FC, ST, SC, PC, APC and MT-RT connectors.

Preferably, the end face of the optical fiber ceramic head is coated with an antireflection film.

The invention has the following beneficial effects:

according to the optical fiber connector, the spring with a small elastic coefficient, the optical fiber ceramic head with a shorter size and the elastic silica gel gasket are arranged, so that the end face distance of the optical fiber ceramic head is suitable for coupling without generating stress; the optical fiber is butted in the optical fiber matching fluid, so that high-power laser can be borne, the end face can be cleaned, the splicing point gap is filled, Fresnel reflection is reduced, the friction force generated by the original installation mode is reduced, the optical fiber matching fluid can work in a humid environment and a high-low temperature environment, and the optical fiber matching fluid can be subjected to repeated plugging and reloading.

Drawings

FIG. 1 is an exploded view of a fiber optic splice of the present invention without an adapter;

FIG. 2 is a schematic view of a butt joint structure of an optical fiber splice without an adapter according to the present invention;

FIG. 3 is a schematic diagram of a connection adapter in the fiber optic splice of the present invention;

fig. 4 is a cross-sectional view of the adapter of fig. 3.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Referring to fig. 1, the optical fiber connector of the present invention includes an optical fiber ceramic head 1, an optical fiber ferrule 2, an optical fiber connection threaded sleeve 4, a spring 5, an optical fiber pigtail sleeve 6, and an adapter. The spring 5 is used for sleeving the optical fiber 3 extending out of the optical fiber tail sleeve 6 and sequentially passing through the optical fiber sleeve ring 2 and the optical fiber ceramic head 1. The optical fiber connection threaded sleeve is sleeved outside the optical fiber sleeve ring and the optical fiber ceramic head and is used for being connected with an adapter, so that the spring 5 acts between the optical fiber tail sleeve 6 and the optical fiber sleeve ring 2. The optical fiber ceramic head 1 is fixed on the optical fiber ferrule 2.

The optical fiber tail sleeve 6 is made of a waterproof rubber sleeve, and a step portion is arranged at one end, connected with the optical fiber connecting threaded sleeve 4, of the optical fiber tail sleeve 6. The upper step surface of the step part is used for being abutted against the end part of the spring, and the lower step surface of the step part is used for being abutted against the optical fiber connection threaded sleeve.

In order to reduce stress generated by end face extrusion when the optical fiber connection threaded sleeve is screwed down on the connector, on one hand, the spring is a spring with an elastic coefficient of 1.698-2.548N/mm. According to the elastic coefficient calculation formula:

wherein, F: the load on the spring; λ: the deformation of the spring when the spring is loaded with a load F; g: shear modulus of the spring material; d: the diameter of the spring wire; d2: the diameter of the spring; n: the effective number of turns of the spring; c: the spring's convolution ratio (also known as the spring index).

It can be seen that increasing the diameter of the spring, decreasing the diameter of the spring wire, changing to a smaller shear modulus spring material, increasing the number of effective turns of the spring, a larger turn ratio, etc., results in a smaller spring rate. The spring with smaller elastic coefficient can reduce the end face extrusion stress to the state that high-power light can not generate fusing.

On the other hand, a shorter suitable ceramic fiber tip is chosen so that the end face distance is suitable for coupling without excessive stress. For example, a fiber ceramic head with a length of 7.93-7.97 mm is used.

The fiber ceramic head can be fixed on the fiber ferrule 2 through a metal fixing piece. One end of the metal fixing piece is clamped and fixed on the metal optical fiber lantern ring, and the other end of the metal fixing piece is used for clamping and fixing the optical fiber ceramic head. In this way, the fiber ceramic ferrule can be conveniently secured to the ferrule 2. Specifically, the metal fixing part is provided with a small circular ring part sleeved in the optical fiber sleeve ring and a large circular ring part used for clamping and fixing the optical fiber ceramic head. The radial size of the small circular ring part is smaller than that of the large circular ring part, and the small circular ring part and the large circular ring part are integrally formed.

The optical fiber ferrule 2 is a metal ferrule, and includes a ferrule body 21, a protrusion 22 disposed outside the ferrule body 21, and a clamping piece 23 disposed outside the ferrule body 21 and on an end face of the protrusion 22 facing the adapter. The optical fiber ferrule 2 can be fixed on the optical fiber tail sleeve 6 by gluing.

When the fiber ceramic head is inserted into the adapter, the fiber ferrule 2 is matched with the adapter in a positioning mode, and then the adapter is fixed through the fiber connecting threaded sleeve.

The adapter comprises an outer shell 7, two inner cannulas 8 arranged on opposite sides of the outer shell 7, and an outer cannula 9 arranged outside the inner cannulas. The inner cannula 8 communicates with the outer housing interior 7. The inner inserting tube 8 is used for inserting the optical fiber ceramic head 1, the space between the inner inserting tube 8 and the outer inserting tube 9 is used for accommodating the lantern ring body 22, the lantern ring body 22 is abutted against the bottom surface 10 of the space between the inner inserting tube 8 and the outer inserting tube 9, and the bulge 22 is abutted against the end part of the outer inserting tube 9. The outer cannula 9 is provided with a clamping groove 91 which is matched with the clamping piece 23 in a clamping way. Preferably, the slot 91 is a U-shaped slot, and the card 23 has a shape matching the U-shaped slot.

The distance between the end faces is further reduced, and an elastic silica gel pad in contact with the optical fiber ceramic head 1 is arranged on the bottom surface 10 of the space between the inner inserting tube 8 and the outer inserting tube 9. The elastic silica gel pad is connected with the bottom surface 10 in an adhesive manner. The problem of poor sealing effect caused by too free movement of the elastic silica gel pad is avoided, and the sealing reliability is improved.

The outer shell 7 contains optical fiber matching fluid 11. The optical fiber matching fluid is a soft, non-sticky, water-resistant, non-toxic, harmless and crystal clear paste compound, and the refractive index of the optical fiber matching fluid is close to that of an optical fiber. After the optical fiber matching fluid is added, the advantages are as follows:

1. when the optical fibers are butted, the optical fiber matching fluid can clean the end faces and bring away grease on hands and dust in air to pollute the end faces. The manpower and material resources for cleaning the end face can be reduced.

2. The optical fibers are butted in the optical fiber matching fluid, and compared with the direct butt joint in the air, the optical fiber matching fluid can reduce the diffusion angle and the coupling angle of the light emitted by the optical fibers, thereby achieving better coupling efficiency.

3. The gap between the splicing points can be filled, Fresnel reflection can be reduced, and particularly when the end face of the optical fiber is not flat, the matching fluid is filled in the continuous joint, so that the light efficiency can be effectively improved.

4. The lubricant can be used as a lubricant, can reduce the friction force generated by the installation in the original mode, can reduce the damage of the end face of the optical fiber, and improves the installation efficiency and the success rate of butt joint.

In order to prevent the matching fluid from leaking when the optical fiber ferrule enters the matching fluid, an elastic silica gel sleeve 13 with a pinhole is arranged in the outer shell 7, and the pinhole opening 131 is arranged corresponding to the inner insertion tube. The elastic silica gel sleeve 13 is sheet-shaped, can be plane sheet-shaped, and can also be curved surface sheet-shaped. The elastic silica gel sleeve can be connected with the inner side wall of the outer shell 7 in an adhesive mode. Or, the elastic silica gel sleeve is provided with an inner cavity, and the inner cavity is filled with the optical fiber matching fluid 11. The elastic silica gel sleeve is a sleeve body with two pinhole openings, and the two pinhole openings respectively correspond to the inner inserting tubes on the two sides of the outer shell.

The optical fiber connector is suitable for FC, ST, SC, PC, APC and MT-RT connectors. For this purpose, the adapter has a connection opening adapted to the fiber stub. Because the adapter is provided with two groups of inner sleeve and outer sleeve combined connecting ports on two opposite sides of the outer shell respectively, two sides of the outer shell of the adapter can be connected with different types of optical fiber connectors or the same type of optical fiber connectors respectively.

The end face of the optical fiber ceramic head is coated with an antireflection film 12. The antireflection film is a surface optical coating, and the transmittance of light on the surface is increased by reducing reflected light, so that the coupling efficiency is improved.

Taking FC joint butt as an example:

when the optical fiber ceramic head 1 is inserted into the adapter, and enters the silica gel sleeve pinhole opening 131 (the opening above fig. 4), the optical fiber ceramic head 1 is filled with the optical fiber matching fluid 11, and the optical fiber matching fluid 11 carries away end face dust and other foreign matters. Continue to go deep into until the card 23 of the optic fibre lantern ring 2 matches with the U type draw-in groove 91 of optic fibre adapter, metal lantern ring 22 touches with bottom surface 10, restriction optic fibre is in a certain position, optic fibre connection thread bush 4 matches with optic fibre connection screw thread 14 and screws up, the last elastic spring 5 compression of FC connector this moment guarantees that optic fibre ceramic head 1 docks, elasticity reduces, but the butt joint of optic fibre head is not extruded, the optic fibre connector revolves on optic fibre connection screw thread 14, the butt joint is accomplished to optic fibre.

When light is transmitted, the light passes through the optical fiber matching fluid 11, the end face extrusion stress is reduced to the state that high-power light is transmitted, and the light cannot be fused; the anti-reflection film 12 is coated on the end face 1 of the optical fiber ceramic head, so that the coupling efficiency is improved.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.