CN211293370U

CN211293370U - Optical interface assembly with low loss and high reliability

Info

Publication number: CN211293370U
Application number: CN201922306677.9U
Authority: CN
Inventors: 苗祺壮; 曹苗
Original assignee: Wuhan Unicell Technologies Co ltd
Current assignee: Wuhan Unicell Technologies Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-08-18
Anticipated expiration: 2029-12-19

Abstract

The utility model provides an optical interface subassembly of low-loss, high reliability, include the metallic coupling ring with the fiber tube on laser instrument or the detector tube is connected, metallic coupling intra-annular is fixed with lens and ceramic lock pin, the ceramic lock pin in-core is fixed with optic fibre, the optical axis of lens with the center pin coincidence of metallic coupling ring, the ceramic lock pin is close to the terminal surface of the one end of lens with axial distance between the lens summit is the definite value. The utility model discloses when optic fibre and laser instrument or detector chip coupling, lens are unchangeable to the coupling focus of optic fibre, only need simple adjusting lens to the distance of laser instrument or detector, and coupling efficiency is adjustable to the highest, makes product working property stable to guarantee the stable transmission of signal.

Description

Optical interface assembly with low loss and high reliability

Technical Field

The utility model relates to an optical fiber communication technical field especially relates to an optical interface subassembly of low-loss, high reliability.

Background

The task of the laser in the photoelectric transmission system is electrical-optical conversion, in order to transmit light emitted by the laser to an external device through an optical fiber, an optical fiber interface assembly needs to be used to couple and package the optical fiber into a certain specific packaging form, so as to achieve stable and reliable transmission and coupling of an optical signal generated by the optical fiber, and simultaneously, it needs to be ensured that an echo reflected back in the transmission process causes damage to the laser. In contrast, the task of the optical detector in the optical-electrical transmission system is optical-electrical conversion, and in order to transmit the optical signal transmitted by the external optical fiber to the optical detector chip, the optical fiber needs to be packaged in a certain packaging form by using an optical fiber interface assembly, so that the optical signal generated by the optical fiber is stably and reliably coupled to the optical detector chip. The butterfly package form is widely applied to the field of optical fiber communication due to the wide transmission rate range, good heat dissipation, high product stability and easy production process of the tube shell.

The optical signal transmitted by the optical fiber is coupled with the laser and the detector chip in two ways: direct coupling, lens coupling. When the optical fiber is directly coupled with the chip, the optical fiber is directly coupled and aligned with the chip, the responsivity index of the chip is poor, and the optical loss is too large. Lens coupling is a combination of adding some single lenses or multiple lenses between an optical fiber and a chip, and coupling efficiency higher than that of direct coupling can be obtained by using the lens coupling, but when the optical fiber of a traditional optical fiber interface component is coupled with a laser or a detector, the coupling focal length from the lens to the optical fiber needs to be adjusted, the distance from the lens to the laser or the detector needs to be adjusted, and the coupling efficiency is low.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides an optical interface subassembly of low-loss, high reliability to solve the problem that traditional optical interface subassembly coupling efficiency is low.

The technical scheme of the utility model is realized like this: the utility model provides a low-loss, high reliability's optical interface subassembly, include the metallic coupling ring with the fiber tube on laser instrument or the detector tube is connected, metallic coupling intra-annular is fixed with lens and ceramic lock pin, the ceramic lock pin in-core is fixed with optic fibre, the optical axis of lens with the center pin coincidence of metallic coupling ring, the ceramic lock pin is close to the terminal surface of the one end of lens with axial distance between the lens summit is the definite value.

Optionally, the lens is an aspheric lens.

Optionally, the metal coupling ring and the laser or the detector tube shell are fixed by glass welding.

Optionally, the included angle between the optical path incident angle of the end face of the ferrule close to the end face of the lens and the axial lead of the ferrule and the axial lead of the metal coupling ring satisfies

n1sinθ＝n2sin(α+θ)；

And theta is the light path incident angle of the end face of the ceramic ferrule close to the lens, alpha is the included angle between the axis of the ceramic ferrule and the axis of the metal coupling ring, n1 is the refractive index of the single-mode optical fiber core, and n2 is the refractive index of air.

Alternatively, θ is 8 ° and α is 3.7 °.

Optionally, the metal coupling ring includes the solid fixed ring of lens, intermediate junction portion, the solid fixed ring of optic fibre in proper order, lens are located in the solid fixed ring of lens just the outer wall of lens with the solid fixed ring's of lens inner wall laminating, the pottery lock pin is located in the solid fixed ring of optic fibre just the outer wall of pottery lock pin with the solid fixed ring's of optic fibre inner wall laminating.

Optionally, an inner wall of one end of the intermediate connecting portion, which is connected to the lens fixing ring, extends toward the direction of the axial line of the lens fixing ring to form a first limiting portion.

Optionally, an inner wall of one end of the optical fiber fixing ring connected to the intermediate connecting portion extends toward the direction of the axis of the optical fiber fixing ring to form a second limiting portion.

Optionally, an opening is cut in the metal coupling ring to form the intermediate connection portion, and the opening is communicated with the hollow inside the metal coupling ring.

Optionally, an optical isolator is mounted on the intermediate connection portion.

The utility model discloses a low-loss, high reliability's optical interface subassembly has following beneficial effect for prior art:

(1) the utility model discloses a low-loss, high reliability optical interface subassembly is when optic fibre and laser instrument or detector chip coupling, and the coupling focus of lens to optic fibre is unchangeable, only needs simple regulation lens to the distance of laser instrument or detector, and coupling efficiency can be adjusted to the highest, makes product working property stable to guarantee signal stable transmission;

(2) the metal coupling ring and the tube shell of the utility model are fixed by glass welding, which not only ensures the sealing performance of the whole structure, but also ensures the stability of the structure;

(3) the included angle between the axis of the ceramic ferrule and the axis of the metal coupling ring is 3.7 degrees, so that the light is ensured to coincide with the axis of the excircle of the metal coupling ring, the excircle of the metal coupling ring is only required to be positioned during coupling assembly, the coupling time is saved, and the working efficiency of coupling operation is improved;

(4) the utility model discloses a first spacing portion can carry on spacingly to lens when mould pressing lens, and the position of ceramic lock pin can be restricted to the spacing portion of second, and the steerable lens summit of first spacing portion and the spacing portion cooperation of second is to the distance of ceramic lock pin terminal surface.

Drawings

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

Fig. 1 is a perspective view of an optical interface assembly of the present invention;

fig. 2 is a cross-sectional view of the optical interface assembly of the present invention along the axial direction;

fig. 3 is a perspective view of the metallic coupling ring of the present invention;

fig. 4 is another perspective view of the metallic coupling ring of the present invention.

Description of reference numerals:

10-a metallic coupling ring; 101-a lens-fixing ring; 102-an intermediate connection; 1021-a first limiting part; 103-fiber fixation ring; 1031-a second limiting part; 20-a lens; 30-a ceramic sleeve; 40-ceramic ferrule; 50-an optical fiber; 60-optical isolator.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

As shown in fig. 1, combine fig. 2, the utility model discloses an optical interface subassembly of low-loss, high reliability, include with the metal coupling ring 10 of being connected of the optic fibre tube on laser instrument or the detector tube shell, metal coupling ring 10 internal fixation has lens 20 and ceramic lock pin 40, ceramic lock pin 40 internal fixation has optic fibre 50, the optical axis of lens 20 with the center pin coincidence of metal coupling ring 10, ceramic lock pin 40 is close to the terminal surface of the one end of lens 20 with axial distance between the lens 20 summit is the definite value.

Wherein the axial direction is a horizontal direction as shown in fig. 2, i.e. an extending direction of the optical interface assembly. The optical interface assembly of the present embodiment is suitable for coupling with a butterfly laser or an optical detector, as shown in fig. 2, the laser or the optical detector is disposed on the left of the optical interface assembly, the metal coupling ring 10 is a hollow circular ring structure, the lens 20 and the ceramic ferrule 40 are both disposed at a hollow portion in the metal coupling ring 10, the lens 20 is fixed to one end of the metal coupling ring 10 close to the laser or the detector through a molding process, and the lens 20 and the ceramic ferrule 40 are both attached to an outer wall of the metal coupling ring 10. Generally, the metal coupling ring 10 is also inserted with a ceramic sleeve 30, the ceramic ferrule 40 is inserted in the ceramic sleeve 30 by an external force interference size, and the ceramic sleeve 30 and the ceramic ferrule 40 are located at one end of the metal coupling ring 10 away from the laser or the detector; to control return loss in the optical path, the ferrule 40 has an 8 ° APC polished surface at one end near the lens 20 and a PC polished surface at the other end.

In the conventional optical interface assembly, when the optical fiber 50 is coupled to a laser or a detector, the coupling focal length from the lens 20 to the optical fiber 50 and the distance from the lens 20 to the laser or the detector need to be adjusted, so that the coupling efficiency is low. In this embodiment, the axial distance between the end face of the ferrule 40 close to the end of the lens 20 and the vertex of the lens 20 is a fixed value, and the fixed value can be set to be equal to the focal length of the lens 20, when the optical fiber 50 is coupled with a laser or a detector chip, the coupling focal length from the lens 20 to the optical fiber 50 is not changed, only the distance from the lens 20 to the laser or the detector needs to be simply adjusted, the coupling efficiency can be adjusted to be the highest, and the working performance of the product is stable, so that stable signal transmission is ensured.

Optionally, the lens 20 is an aspheric lens 20. The coupling efficiency of the aspheric lens 20 is higher than that of the spherical lens 20, the responsivity index of the laser or the detector chip is high, and the signal transmission is stable.

Optionally, the metal coupling ring 10 and the laser or detector tube shell are fixed by glass welding.

Among the traditional optical interface subassembly, metallic coupling ring 10 and laser instrument or detector tube shell often adopt gold tin welding to connect fixedly, and the cost is higher, and metallic coupling ring 10 adopts glass welded fastening with the tube shell in this embodiment, has both guaranteed overall structure's leakproofness, also guarantees the stability of structure.

Optionally, as shown in fig. 2, an angle between an incident angle of an optical path of an end face of the ferrule 40 close to one end of the lens 20 and an axial line of the ferrule 40 and an axial line of the metal coupling ring 10 satisfies a requirement of an included angle

n1sinθ＝n2sin(α+θ)；

Wherein θ is the light path incident angle of the end face of the ferrule 40 close to the lens 20, α is the included angle between the axial lead of the ferrule 40 and the axial lead of the metal coupling ring 10, n1 is the refractive index of the single-mode fiber core, and n2 is the refractive index of air. In general, θ is 8 ° and α is 3.7 °.

In the conventional optical interface assembly, an end face of one end of the ferrule 40 close to the lens 20 is an 8-degree plane, that is, θ is 8 °, which causes a 3.7-degree deflection between the emitted optical path from the 8-degree plane and the axis of the ceramic, and the metal coupling ring 10 needs to be tilted by 3.7 degrees to compensate during coupling, resulting in complicated coupling operation and high precision requirement on coupling equipment. In the embodiment, the included angle between the axis of the ceramic ferrule 40 and the axis of the metal coupling ring 10 is 3.7 degrees, so that the light is ensured to coincide with the axis of the outer circle of the metal coupling ring 10, the outer circle of the metal coupling ring 10 is only needed to be positioned during coupling assembly, the coupling time is saved, and the working efficiency of coupling operation is improved.

Optionally, as shown in fig. 1 and fig. 2, the metal coupling ring 10 sequentially includes a lens fixing ring 101, an intermediate connecting portion 102, and a fiber fixing ring 103, the lens 20 is located in the lens fixing ring 101, an outer wall of the lens 20 is attached to an inner wall of the lens fixing ring 101, and the ferrule 40 is located in the fiber fixing ring 103, an outer wall of the ferrule 40 is attached to an inner wall of the fiber fixing ring 103. The lens holding ring 101, the intermediate connecting portion 102, and the fiber holding ring 103 are integrally molded, and the thickness of the lens 20 is the same as the length of the lens holding ring 101.

Alternatively, as shown in fig. 2 and 3, an inner wall of one end of the intermediate connecting portion 102 connected to the lens fixing ring 101 extends toward the axial line of the lens fixing ring 101 to form a first position limiting portion 1021.

The intermediate connecting portion 102 may be a sealed ring structure, or may be regarded as a structure remaining after a next opening is cut on the ring, the first limiting portion 1021 may be a whole ring structure protruding along the inner wall of the intermediate connecting portion 102, or may be a small blocking block protruding along the inner wall of the intermediate connecting portion 102, and the first limiting portion 1021 may be distributed at one end of the intermediate connecting portion 102 connected to the lens fixing ring 101, or may be distributed in the entire intermediate connecting portion 102. When the first position-limiting portion 1021 is distributed on the entire intermediate connecting portion 102, the length of the first position-limiting portion 1021 in the axial direction is the same as the length of the intermediate connecting portion 102. It is easy to think that, in order to avoid blocking the optical path, the entity part of the first position-limiting part 1021 is not in the optical path. The inner wall of the lens fixing ring 101 and the first stopper 1021 form a step-like structure for stopping the lens 20 when the lens 20 is molded.

Alternatively, as shown in fig. 2 and 4, an inner wall of one end of the fiber fixing ring 103 connected to the intermediate connecting portion 102 extends toward the axial line of the fiber fixing ring 103 to form a second stopper 1031.

The second position-limiting portion 1031 may be a whole ring structure protruding along the inner wall of the fiber fixing ring 103, or may be a small blocking block protruding along the inner wall of the fiber fixing ring 103, and the second position-limiting portion 1031 may only be located at one end of the fiber fixing ring 103 close to the intermediate connection portion 102. The inner wall of the fiber fixing ring 103 and the second position-limiting portion 1031 actually form a step-like structure for limiting the position of the ferrule 40, and when the first position-limiting portion 1021 and the second position-limiting portion 1031 cooperate, the distance from the apex of the lens 20 to the end face of the ferrule 40 is controlled by the first position-limiting portion 1021 and the second position-limiting portion 1031.

Alternatively, as shown in fig. 1 and 2, an opening is cut in the metal coupling ring 10 to form the intermediate connection portion 102, and the opening is communicated with the hollow inside the metal coupling ring 10. In this embodiment, the intermediate connecting portion 102 is preferably a structure left after cutting an opening on the ring, the opening is communicated with the hollow inside the metal coupling ring 10, and the opening can be used as a passage for placing the lower mold core when the lens 20 is molded.

Alternatively, as shown in fig. 2, the optical isolator 60 is mounted to the intermediate connection portion 102. When the optical interface module is coupled to the laser after the molding of the lens 20 of this embodiment, the optical isolator 60 may be mounted on the intermediate connection portion 102 to eliminate optical signal noise. When an opening is cut in the metal coupling ring 10 to form the intermediate connection portion 102, the optical isolator 60 can be conveniently installed in an open slot surrounded by the lens fixing ring 101, the intermediate connection portion 102, and the optical fiber fixing ring 103. Wherein the optical interface assembly of the present embodiment is adapted to couple with a probe when the optical isolator 60 is not installed.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical interface component with low loss and high reliability comprises a metal coupling ring (10) connected with an optical fiber tube on a laser or detector tube shell, wherein a lens (20) and a ceramic ferrule (40) are fixed in the metal coupling ring (10), an optical fiber (50) is fixed in the ceramic ferrule (40), and the optical axis of the lens (20) is superposed with the central axis of the metal coupling ring (10), and is characterized in that the axial distance between the end face of one end, close to the lens (20), of the ceramic ferrule (40) and the vertex of the lens (20) is a fixed value.

2. The low loss, high reliability optical interface assembly of claim 1, wherein said lens (20) is an aspheric lens (20).

3. The low loss, high reliability optical interface package of claim 1, wherein said metallic coupling ring (10) is glass welded to the laser or detector package.

4. The low loss, high reliability optical interface assembly of claim 1, wherein the angle between the incident angle of the optical path of the endface of the ferrule (40) near one end of the lens (20) and the axis of the ferrule (40) and the axis of the metallic coupling ring (10) is such that

n1sinθ＝n2sin(α+θ)；

Theta is the light path incident angle of the end face of one end, close to the lens (20), of the ceramic ferrule (40), alpha is the included angle between the axial lead of the ceramic ferrule (40) and the axial lead of the metal coupling ring (10), n1 is the single-mode fiber core refractive index, and n2 is the air refractive index.

5. The low loss, high reliability optical interface package of claim 4, wherein θ is 8 ° and α is 3.7 °.

6. The low-loss high-reliability optical interface assembly according to claim 1, wherein the metal coupling ring (10) comprises a lens fixing ring (101), an intermediate connecting portion (102), and a fiber fixing ring (103), in sequence, the lens (20) is located in the lens fixing ring (101) and an outer wall of the lens (20) is attached to an inner wall of the lens fixing ring (101), the ferrule (40) is located in the fiber fixing ring (103) and an outer wall of the ferrule (40) is attached to an inner wall of the fiber fixing ring (103).

7. The optical interface module with low loss and high reliability according to claim 6, wherein an inner wall of an end of the intermediate connecting portion (102) connected to the lens fixing ring (101) extends toward an axial line of the lens fixing ring (101) to form a first position-limiting portion (1021).

8. The low loss, high reliability optical interface module according to claim 6 or 7, wherein an inner wall of an end of the fiber securing ring (103) connected to the intermediate connecting portion (102) extends toward an axial line of the fiber securing ring (103) to form a second position-limiting portion 1031.

9. The low loss, high reliability optical interface assembly of claim 6 wherein said intermediate connection portion (102) is formed by cutting an opening in said metallic coupling ring (10), said opening communicating with a hollow in said metallic coupling ring (10).

10. A low loss, high reliability optical interface assembly as claimed in claim 6 or 9, wherein said intermediate connection (102) is fitted with an optical isolator (60).