CN211123366U

CN211123366U - Beam expanding optical fiber connector terminal

Info

Publication number: CN211123366U
Application number: CN201921476901.2U
Authority: CN
Inventors: 王芳; 龚鸿若; 周雅娴; 孙成远; 赵锐
Original assignee: Shanghai Institute Of Transmission Line (cetc No23 Institute)
Current assignee: Shanghai Institute Of Transmission Line (cetc No23 Institute); CETC 23 Research Institute
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-07-28
Anticipated expiration: 2029-09-06

Abstract

The utility model relates to a beam expanding optical fiber connector terminal, including beam expanding lens, first sleeve, second sleeve, third sleeve, optic fibre holder and tighten up the sleeve, beam expanding lens realizes beam expanding optical fiber connector's the function of expanding beam, first sleeve, second sleeve, third sleeve realize respectively beam expanding lens's the fixed, optic fibre fixed, the connection of on-the-spot termination optic fibre, optic fibre holder and tighten up the sleeve and be used for the optic fibre of whole terminal of fixed and centre gripping and termination; the utility model discloses the back can be accomplished by the equipment of manufacture factory to the component part, can be by the free termination optic fibre of customer, need not polish the optic fibre terminal surface, has solved the job site and has exempted from the polishing, make fast and expand beam optical fiber connector's technical problem.

Description

Beam expanding optical fiber connector terminal

Technical Field

The utility model belongs to the technical field of optical fiber transmission, a expand optical fiber connector terminal is related to.

Background

Fiber optic connectors are one of the essential key components of all fiber optic communication systems. The primary function of a fiber optic connector is to connect a plurality of telecommunications equipment, modules, units, optical fibers, fiber optic cables, etc. so that the overall system can be manufactured and tested in sections. The beam expanding optical fiber connector has the characteristics of easiness in cleaning, dust resistance, impact vibration resistance, environmental temperature change resistance, high power resistance and the like, so that the beam expanding optical fiber connector is widely applied to various high-vibration or dirty environments.

At present, the production process of the optical fiber expanded beam connector is more complicated than that of a common optical fiber connector. And generally do not have the capability of being field installable. Expanded beam connectors with field installability still require the end face polishing of the optical fiber to be performed in the field as with conventional fiber optic connectors. The field-installable expanded beam connector system as described in CN103946730A still requires field termination of the optical fiber within the ferrule (ferrule) using conventional termination and polishing techniques.

Exempt from polishing, make fast and expand a beam of optical fiber connector's technical problem for solving the job site, the utility model provides a can exempt from polishing, the beam of expanding optical fiber connector of making fast on site.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at overcomes the current inconvenient field installation's of the fiber connector terminal that expands that exists among the above-mentioned background art problem provides thereby expand the beam fiber connector terminal and realize exempting from polishing, the beam expanding fiber connection that can the field installation.

For solving the technical problem, the technical solution of the utility model is realized as follows:

an expanded beam fiber optic connector terminal, comprising: by first sleeve 1, beam expanding lens 2, second sleeve 3, optic fibre 4, optic fibre holder 5, tighten up sleeve 6 and third sleeve 8 and constitute, beam expanding lens 2, second sleeve 3 and optic fibre 4 set up in first sleeve 1, second sleeve 3 and optic fibre 4 partially expose first sleeve 1, second sleeve 3, third sleeve 8 are fixed in optic fibre holder 5, optic fibre 4 is arranged in the hole of second sleeve 3, third sleeve 8, the terminal surface is located before optic fibre 4 the focus of beam expanding lens 2 or apart from 2 focus distances of beam expanding lens 2 and be less than 1/3 beam expanding lens 2 radial position.

Furthermore, the front end face of the optical fiber 4 is subjected to grinding and polishing treatment, the other end of the optical fiber is positioned in the middle of the third sleeve 8, and the end face of the optical fiber 4 positioned in the middle of the third sleeve 8 is subjected to cutting treatment or grinding and polishing treatment by an optical fiber cutter.

Further, the inner hole diameters provided in the second sleeve 3 and the third sleeve 8 are not smaller than the outer diameter of the optical fiber 4 and not larger than 5 μm.

Furthermore, the part of the optical fiber 4 in the inner hole of the third sleeve 8 is filled with matching paste, and the refractive index of the matching paste is 1.4-1.5.

Further, the optical fiber clamping member 5 is located outside the tightening sleeve 6, and both the optical fiber clamping member 5 and the tightening sleeve 6 are elastic components.

Further, the beam expanding lens 2 is fixed at the front end of the first sleeve 1 through glue bonding or a buckle structure in a matching manner.

Further, the beam expanding lens 2 is fixed on the second sleeve 3 along with the first sleeve 1 by tight fit, press fit or glue fixing position, and the front end face of the second sleeve 3 is located at the focus of the beam expanding lens 2.

Further, a first inner hole 51, a second inner hole 59 and a third inner hole 54 are sequentially arranged in the fiber holding member 5 from the end close to the beam expanding lens 2, the first inner hole 51 is matched with the outer surface of the second sleeve 3, and the second inner hole 59 is matched with the third sleeve 8.

Further, the outer near beam expanding lens 2 end of the optical fiber clamping piece 5 is provided with a first step 52, the inner outer middle section of the optical fiber clamping piece 5 is provided with a second step 55, the second step 55 is provided with an external thread, the outer tail end of the optical fiber clamping piece 5 is provided with a third step 56, the third step 56 is provided with a taper fitting surface and two or more than two notches 58, and a sawtooth 57 is arranged in the third inner hole 54.

Further, an inner boss 61 is arranged at the end of the tightening sleeve 6 close to the expander lens 2, the inner boss 61 is matched with the first step 52 of the optical fiber clamping member 5, and the rear-end taper matching surface 62 is smaller than the taper of the third step 56 of the optical fiber clamping member.

The utility model discloses following beneficial effect can be brought:

1. the utility model discloses do not need the abrasive polishing during well termination optic fibre, but site-erection compares with ordinary fiber connector technology, and the site-erection requires very low. The utility model discloses each part modularization of terminal through replacing a small number of parts, can realize matcing the different beam expanding connector terminal of multiple optic fibre. The utility model discloses a nested structural design of many sleeves cooperation has enlarged optical fiber transmission's light beam size, has the ability of easy cleanness, anti dust, shock-resistant vibration, resistant ambient temperature change, resistant high power, in addition, the utility model discloses structure interchangeability is good, easily make, the finished product qualification rate is high, with low costs.

2. The utility model provides a terminal compact structure, overall dimension is little, but the shell of the connector such as the FC of disect insertion standard, ST, L C, SC, J599(MI L-38999) in, replace former lock pin, become non-contact connector with former connector by contact connector to improve the reliability of connector.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following preferred embodiments are described in detail with reference to the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 the utility model discloses a terminal plane structure chart of beam expanding fiber connector

Fig. 2 the utility model discloses a three-dimensional split structure chart of beam expanding fiber connector terminal

Wherein:

1 first sleeve 11 inner hole 2 beam expanding lens 3 second sleeve 31 front end face center

32 optical fiber rear end 4 optical fiber 5 optical fiber holder 51 first bore 52 first step

53 taper step hole 54 third inner hole 56 third step 57 sawtooth 58 notch

59 second bore 6 tightens up the mating surface of taper 62 of the boss 62 of the bush 61

7-terminated optical fiber 71 fiber front end 8 third sleeve 81 chamfer

Detailed Description

To further explain the technical means, creation features, achievement objectives and functions of the present invention, it is easy to understand and understand that the following detailed description, with reference to the accompanying drawings and preferred embodiments, describes the specific implementation, structure, features and functions of the beam expanding fiber optic connector terminal according to the present invention.

Example 1

The utility model provides a beam expanding fiber connector terminal, by first sleeve 1, beam expanding lens 2, second sleeve 3, third sleeve 8, optic fibre 4, optic fibre holder 5 with tighten up sleeve 6 and constitute, be provided with beam expanding lens 2 in the first sleeve 2, second sleeve 3 and optic fibre 4 part expose first sleeve 2, second sleeve 3, third sleeve 8 are fixed in optic fibre holder 5, optic fibre 4 is arranged in second sleeve 3, the hole of third sleeve 8, the terminal surface is arranged in beam expanding lens 2's focus position before the optic fibre 4.

The optic fibre 4 is the optic fibre that the terminal surface was handled for both ends, and the terminal surface is the grinding and polishing processing and the other end is located 8 middle parts of third sleeve before the optic fibre 4, and the terminal surface that optic fibre 4 is located 8 middle parts of third sleeve is the cutting of optic fibre cutting knife and is handled. The beam expanding lens 2 is fixed at the front end of the first sleeve 1 in a bonding fit mode through glue. The beam expanding lens 2 is fixed on the second sleeve 3 along with the first sleeve 1 by adopting close fit or press fit or glue fixing position, and the front end face of the second sleeve 3 is positioned at the focus of the beam expanding lens 2. The diameters of the inner holes formed in the second sleeve 3 and the third sleeve 8 are not less than 5 μm in the outer diameter of the optical fiber 4. The fiber holding member 5 is located outside the tightening sleeve 6, and after the tightening sleeve 6 is connected, the fiber holding member 5 is squeezed to compress the field-terminated optical fiber. The fiber holding member 5 is internally provided with a first inner hole 51, a second inner hole 59 and a third inner hole 54 in sequence from the end close to the expanded beam lens 2, the first inner hole 51 is matched with the outer surface of the second sleeve 2, the second inner hole 59 is matched with the third sleeve 8, and the third inner hole 54 accommodates the terminating fiber 7.

The outside of optic fibre holder 5 is close to beam expanding lens 2 and is provided with first step 52, and the inside outside middle section of optic fibre holder 5 is provided with second step 55, is provided with the external screw thread and is used for fixed tightening sleeve, and the outside tail end of optic fibre holder 5 is provided with third step 56, and third step 56 is provided with a tapering fitting surface and three notch 58, and the inside sawtooth 57 that supplementary optic fibre was pressed from both sides that is provided with of third hole 54. The tightening sleeve 6 is provided with an internal boss 61 near the end of the expander lens 2, the internal boss 61 engaging with the first step 52 of the fiber holding member 5. The rear tapered mating surface 62 is slightly smaller than the taper of the third step 56 of the fiber holding member, and the two contact surfaces are in close contact to compress and clamp the fiber after field installation. The part of the optical fiber 4 in the inner hole of the third sleeve 8 is filled with matching paste, and the refractive index of the matching paste is 1.4.

The utility model provides a polishing-free, field installation expand beam optical fiber connector terminal constitutes spare part and finishes by the manufacture factory equipment back, can be by customer free termination optic fibre, does not need polishing fiber end face to overall structure size accords with ordinary fiber connector lock pin, can pack into in connectors such as the FC of standard, ST, L C, SC, J599(MI L-38999).

The beam expanding lens can adopt a ball lens, a G-L ENS, a C-L ENS or an aspheric lens and the like, and is fixed at the front end of the first sleeve.

The first sleeve is a cylinder with a chamfer, and the outer surface of the first sleeve is a precise smooth surface which is a reference of the whole terminal. The inner surface is highly concentric with the outer surface for securing the expander lens and the second sleeve. The whole material can be made of hard materials such as wear-resistant ceramic or metal materials.

The outer surface of the second sleeve is tightly matched with the inner surface of the first sleeve, the inner hole is used for fixing the pretreated optical fiber by glue, and the rear end of the inner surface is provided with a large inverted angle which is beneficial to the penetration of the optical fiber. In order to ensure the concentricity of the inner hole of the second sleeve and the first sleeve, the material can be easily processed metal or high-precision ceramic.

The third sleeve is arranged at the rear end of the second sleeve (the front end of the third sleeve is close to the end of the beam expanding lens in the non-specific description of the patent), the pretreated optical fiber is arranged at the front end of the third sleeve, the optical fiber at the rear end is the optical fiber installed on site, and the optical fiber is aligned in the third sleeve. The rear end of the third sleeve is filled with matching paste before leaving the factory. The matching paste has a refractive index comparable to the core of the optical fiber, enabling low-loss connection of the terminating fiber to the pre-processed fiber. In order to ensure good butt joint of the terminated optical fiber and the pretreated optical fiber, the material of the whole sleeve should be metal or ceramic which is easy to process an inner hole with high precision or polymer material which can be molded, such as engineering plastic and the like.

The front end of the pre-processed fiber is processed with a polishing process similar to that of a conventional fiber optic connector with the second ferrule. The rear end is positioned in the third sleeve and is cut into a flat surface by an optical fiber cutter.

The optical fiber clamping member is externally provided with three steps, a first step at the front end is used for positioning and is positioned with a spring in FC, ST and L C, SC, J599(MI L-38999) is similar to a connector and is positioned with a clamping jaw, a second step is used for fixing a tightening sleeve and is provided with an inverted angle, a third step is provided with a taper matching surface and two or more notches to realize the clamping of the optical fiber after the termination, a first hole at the front end in the optical fiber clamping member is matched with the outer surface of the second sleeve, a second hole at the front end is used for fixing the third sleeve, a third hole at the front end is provided with a taper step hole in the middle, the taper is used for enabling the optical fiber after the termination to easily penetrate, the larger part of the hole diameter enables the optical fiber after the termination to leave an internal micro-bending space at a terminal so that the rear end of the optical fiber is tightly contacted with the front end of the optical fiber after the pretreatment, a sawtooth structure for assisting the clamping of the optical fiber is arranged at the rear end, and.

The front end of the tightening sleeve is provided with an inner boss which is matched with the first step of the optical fiber clamping piece after installation, and the matching surface of the rear taper sleeve which is arranged during matching is contacted with the third step of the optical fiber clamping piece and then compresses and clamps the optical fiber.

The utility model provides an exempt from optic fibre grinding and polishing, but on-the-spot installation expand beam connector terminal. Specifically, the utility model discloses contain each functional part of beam expanding fiber connector terminal: light path beam expanding collimation receiving and sending, optical fiber butt joint and optical fiber clamping fixing.

Example 2

On the basis of the embodiment 1, the following technical scheme characteristics are replaced: the position of the front end face of the optical fiber 4 is adjusted to a radial position 1/3 from the focal point of the expander lens 2. The beam expanding lens 2 is fixed at the front end of the first sleeve 1 in a matched mode through a buckle structure. The beam expanding lens 2 is fixed on the second sleeve 3 along with the first sleeve 1 by adopting a compression joint matching fixed position. The rear end face of the pretreated optical fiber is ground.

Example 3

As shown in fig. 1 and 2, the first sleeve 1, the beam expanding lens 2, the second sleeve 3, and the pre-processed optical fiber 4 achieve a light path beam expanding collimating transceiving function, the beam expanding lens 2 is fixed in an inner hole of the first sleeve 1 by using high-performance glue, and the center of the front end face of the pre-processed optical fiber, that is, the center 31 of the front end face of the second sleeve 3, is fixed to the focal point of the beam expanding lens 2 by using a mechanical or optical debugging method.

The first sleeve 1 is a cylinder with a chamfer at the front end and is made of high-precision zirconia ceramic materials, the inner surface and the outer surface are ground into smooth surfaces, and the concentricity of the inner surface and the outer surface is less than 10 microns. The outer surface is used for realizing the optical path reference of the whole connector, and when two connectors are connected, the outer surface of the 1 st sleeve 1 can be placed in the connector with an elastic sleeve, a precise V-shaped groove or a precise inner hole, so that the low-loss connector of the two connectors is realized. The front end of the inner surface is fixed with the beam expanding lens 2, and the rear end adopts close fit, crimping fit or glue to fix the second sleeve 3.

The inner and outer surfaces of the second sleeve 3 are ground to be smooth surfaces, and the concentricity of the inner surface and the outer surface is less than 2 microns. The outer surface is closely matched with the inner surface of the first sleeve 1, the inner surface adopts glue to fix the preprocessed optical fiber 4, and the rear end of the inner surface is provided with a large inverted angle, so that the preprocessed optical fiber 4 can be conveniently penetrated in production.

And both ends of the preprocessed optical fiber 4 are processed by adopting a polishing process, the front end is polished with the front end face of the second sleeve 3, and the rear end face is positioned in the middle of the third sleeve 8, so that the optical fiber 7 is butted with the end connection optical fiber.

The third sleeve 8 is mainly used for realizing the function of optical fiber butt joint and is arranged at the rear end of the second sleeve 3, the preprocessed optical fiber 4 is loaded from the front end of the third sleeve 8, the optical fiber loaded from the rear end is a terminating optical fiber 7 installed on the field of the connector, and the two optical fibers are aligned in the middle of the third sleeve 8. In order to realize better performance, a small amount of matching paste is filled in the inner hole of the third sleeve 8 without the pretreated optical fiber 4 before leaving the factory. The matching paste has a refractive index comparable to the core of the optical fiber, enabling low-loss connection of the terminating fiber to the pre-processed fiber.

The fiber holding member 5 and the take-up sleeve 6 perform the fiber holding and securing function, the fiber holding member 5 is provided with a front first step 52 for positioning and spring positioning in FC, ST, L C, SC, J599(MI L-38999) similar to a connector with a jaw, a second step 55 for securing the take-up sleeve and external threads, a third step 56 is provided with a tapered mating surface and two notches 58 for gripping the terminated rear fiber 7, a fiber holding member internal front first bore 51 for mating with the second sleeve external surface, a second bore 59 for securing the third sleeve, a third bore 54 with a tapered step bore 53 in the middle, the taper for facilitating penetration of the terminated fiber 7, the larger bore diameter portion leaving an internal microbending space for the terminated fiber 7 at the terminal, the fiber front 71 for making intimate contact with the pre-treated fiber rear 32, a tail end of the third bore 54 provided with a serration 57 to assist in fiber gripping the coating of the terminated fiber 7, the fiber holding member may be made of a material having a strength and good resilience, typically made of PEI.

The front end of the take-up sleeve 6 is provided with an internal boss 61 which, when installed, engages the first step 52 of the fiber holding member. The rear tapered mating surface 62 is slightly smaller than the taper of the third step 56 of the fiber holding member, and the two contact surfaces are in close contact to compress and clamp the fiber after field installation.

In the whole terminal of the beam expanding optical fiber connector, an optical signal low-loss connector transmitted by the terminating optical fiber is transmitted into the preprocessing optical fiber, and an optical signal in the preprocessing optical fiber is amplified by the beam expanding lens and then transmitted. Because of the expansion of the light beam, the beam expanding optical fiber connector has the characteristics of easy cleaning, dust resistance, impact vibration resistance and the like, so that the beam expanding connector is widely applied to various high-vibration or dirty environments. Because technology is complicated for current beam expanding fiber connector can not realize the site operation preparation, and the utility model discloses a technique can realize the polishing is exempted from in exempting from of job site's grinding, very simple preparation, assembly beam expanding fiber connector.

The structure and the principle of the utility model are further explained as follows: the beam expanding lens is arranged in the first sleeve, and the beam expanding function of the beam expanding optical fiber connector is realized. The first sleeve, the second sleeve and the third sleeve are used for fixing the beam expanding lens, fixing the preprocessed optical fiber and connecting the field-terminating optical fiber. One end of the preprocessed optical fiber is bonded and fixed in the second sleeve by glue and is ground and polished to achieve the purpose of reducing loss, and the other end of the preprocessed optical fiber can be cut flat by an optical fiber cutter or freely inserted into the middle of the third sleeve after being ground and polished. When the optical fiber is terminated on site, the terminated optical fiber is cut to be flat by a cutter, and then penetrates into the optical fiber clamping piece and the tightening sleeve from the rear end of the terminal, and then the terminated optical fiber end face is tightly connected with the pretreated optical fiber end face, and low-loss optical connection can be realized after matching fluid is added. Tightening the tightening sleeve and squeezing the fiber clamp to secure the terminated fiber.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. An expanded beam fiber optic connector terminal, comprising: constitute by first sleeve (1), beam expanding lens (2), second sleeve (3), optic fibre (4), optic fibre holder (5), tighten up sleeve (6) and third sleeve (8), beam expanding lens (2), second sleeve (3) and optic fibre (4) set up in first sleeve (1), first sleeve (1) is exposed to second sleeve (3) and optic fibre (4) part, second sleeve (3), third sleeve (8) are fixed in optic fibre holder (5), optic fibre (4) are located in the hole of second sleeve (3), third sleeve (8), optic fibre (4) preceding terminal surface is located the focus of beam expanding lens (2) or apart from beam expanding lens (2) focus distance is less than 1/3 beam expanding lens (2) radial position.

2. The connector terminal of expanded beam optical fiber according to claim 1, wherein the front end face of the optical fiber (4) is processed by grinding and polishing and the other end is located at the middle part of the third sleeve (8), and the end face of the optical fiber (4) located at the middle part of the third sleeve (8) is processed by cutting with an optical fiber cutter or by grinding and polishing.

3. The expanded beam optical fiber connector terminal according to claim 1, wherein the inner bore diameters provided in the second sleeve (3) and the third sleeve (8) are not smaller than the outer diameter of the optical fiber (4) and not larger than 5 μm.

4. The connector terminal according to claim 1, wherein the portion of the optical fiber (4) in the inner bore of the third sleeve (8) is filled with a matching paste, and the refractive index of the matching paste is 1.4-1.5.

5. The expanded beam fiber optic connector terminal according to claim 1, wherein said fiber holding member (5) is located outside of said tightening sleeve (6), and both said fiber holding member (5) and said tightening sleeve (6) are elastic members.

6. The connector terminal of one of claims 1 to 5, wherein the expander lens (2) is fixed to the front end of the first sleeve (1) by gluing or snap-fit.

7. The connector terminal of claim 6, wherein the expander lens (2) is fixed to the second sleeve (3) along with the first sleeve (1) by means of tight fit, press fit or glue fixation, and the front end face of the second sleeve (3) is located at the focal point of the expander lens (2).

8. The expanded beam optical fiber connector terminal according to any one of claims 1 to 5, wherein a first inner hole (51), a second inner hole (59) and a third inner hole (54) are sequentially formed inside the optical fiber clamping member (5) from the end close to the expanded beam lens (2), the first inner hole (51) is matched with the outer surface of the second sleeve (3), and the second inner hole (59) is matched with the third sleeve (8).

9. The expanded beam optical fiber connector terminal according to claim 8, wherein the outer end of the optical fiber holding member (5) near the expanded beam lens (2) is provided with a first step (52), the inner and outer middle section of the optical fiber holding member (5) is provided with a second step (55), the second step (55) is provided with an external thread, the outer end of the optical fiber holding member (5) is provided with a third step (56), the third step (56) is provided with a tapered mating surface and two or more notches (58), and the third inner hole (54) is internally provided with sawteeth (57).

10. The expanded beam optical fiber connector terminal according to claim 9, wherein the tightening sleeve (6) is provided with an inner boss (61) near the end of the expanded beam lens (2), the inner boss (61) is engaged with the first step (52) of the optical fiber holding member (5), and the taper mating surface (62) formed by the optical fiber (4) and the inner surface end of the inner boss (61) is smaller than the taper of the third step (56) of the optical fiber holding member.