CN212623220U

CN212623220U - BOSA optical device

Info

Publication number: CN212623220U
Application number: CN202021799753.0U
Authority: CN
Inventors: 邱名武; 江虹; 陈雪梅; 饶华斌
Original assignee: Xiamen San U Optronics Co ltd
Current assignee: Xiamen San U Optronics Co ltd
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-02-26
Anticipated expiration: 2030-08-25

Abstract

The utility model provides a BOSA optical device, include: a transmitting end for transmitting a light beam; the first lens is arranged on one side of the emission end; the isolator is arranged on one side of the first lens, which is far away from the emission end; the second lens is arranged on one side of the isolator, which is far away from the first lens; a 45-degree wave plate obliquely arranged on one side of the second lens away from the isolator; the third lens is arranged on one side of the 45-degree wave plate, which is far away from the second lens; the receiving end is arranged beside the 45-degree wave plate; the light beam emitted by the emitting end sequentially passes through the first lens, the isolator, the second lens, the 45-degree wave plate and the third lens. The utility model discloses structural design is ingenious, has realized that the light beam focus is controllable, and has reduced the overall length tolerance of BOSA subassembly, has reduced manufacturing cost and has reduced power loss.

Description

BOSA optical device

Technical Field

The utility model relates to a BOSA subassembly field, more specifically the saying so relates to a BOSA optical device.

Background

With the continuous development of the optical communication technology and the continuous progress of the optical application field, the requirements on the luminous intensity of an optical signal on an RFOG simulation product are higher and higher, and the requirements on the corresponding bandwidth of a receiving end are also higher and higher. It is well known to use a 45 ° splitter on an RFOG-tx BOSA package to separate the wavelength of the transmitted signal 1610nm from the wavelength of the received signal 1550 nm. However, the conventional BOSA assembly has the problems of difficult control of the focal length of a light beam, large tolerance of the total length and large power loss.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a BOSA optical device.

The utility model discloses it is difficult the problem that accuse, total length tolerance are big and power loss is big to the light beam focus to solve.

Compared with the prior art, the utility model discloses technical scheme and beneficial effect as follows:

a BOSA optical device, comprising: a transmitting end for transmitting a light beam; the first lens is arranged on one side of the emission end; the isolator is arranged on one side of the first lens, which is far away from the emission end; the second lens is arranged on one side of the isolator, which is far away from the first lens; a 45-degree wave plate obliquely arranged on one side of the second lens away from the isolator; the third lens is arranged on one side of the 45-degree wave plate, which is far away from the second lens; the receiving end is arranged beside the 45-degree wave plate; the light beam emitted by the emitting end sequentially passes through the first lens, the isolator, the second lens, the 45-degree wave plate and the third lens.

As a further improvement, the receiving end further comprises a 0 ° wave plate arranged between the receiving end and the 45 ° wave plate.

As a further improvement, the method further comprises the following steps: the support is sleeved outside the transmitting end, the first lens is fixedly arranged inside the support, and the isolator is arranged on the support; the square seat is matched with the support, the second lens is fixedly arranged on the inner side of the square seat, and the 45-degree wave plate, the 0-degree wave plate and the receiving end are fixedly arranged on the square seat; and the adjusting ring is connected to one end, far away from the support, of the square base, and the third lens is fixedly arranged on the adjusting ring.

As a further improvement, an angle formed by the mirror surface of the 45 ° wave plate and the center line of the isolator is 45 °, an angle formed by the other mirror surface of the 45 ° wave plate and the center line of the third mirror plate is 45 °, and an angle formed by the other mirror surface of the 45 ° wave plate and the center line of the receiving end is 45 °.

As a further improvement, an antireflection film is arranged on the mirror surface of the 45 ° wave plate close to the isolator, and a reflection film is arranged on the mirror surface of the 45 ° wave plate close to the third lens.

As a further improvement, the first lens is a TO-CAN cap with a focusing lens.

As a further improvement, the second lens is a collimating lens.

As a further improvement, the third lens is a C-lens.

As a further improvement, the third lens is a G-lens.

The utility model has the advantages that: the combined arrangement of the first lens, the isolator, the second lens, the 45-degree wave plate and the third lens is adopted, so that light rays emitted by the emitting end finally irradiate the end face of the third lens in a parallel light mode, and light beams are focused on the end face of the optical fiber of the tail fiber, the controllability of the focal length of the light beams is realized, the total length tolerance of the BOSA component is reduced, the production cost is reduced, and the power loss is reduced.

Drawings

Fig. 1 is an overall cross-sectional view of a BOSA optical device according to an embodiment of the present invention.

Fig. 2 is an enlarged view of a partial structure provided in an embodiment of the present invention.

In the figure: 1. transmitting terminal 2, first lens 3, isolator 4, second lens 5.45 degree wave plate

6. Third lens 7, receiving end 8.0 degree wave plate 9, support 10, square base

11. Adjusting ring 12, tail fiber 13, LD chip

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are 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 belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 to 2, a BOSA optical device includes: an emitting terminal 1 for emitting a light beam; a first lens 2 disposed on one side of the emission end 1; the isolator 3 is arranged on one side of the first lens 2, which is far away from the emitting end 1; a second lens 4 disposed on a side of the isolator 3 away from the first lens 2; a 45 ° wave plate 5 obliquely arranged on a side of the second lens 4 away from the isolator 3; the third lens 6 is arranged on one side of the 45-degree wave plate 5 away from the second lens 4; and a receiving end 7 arranged beside the 45-degree wave plate 5; the light beam emitted by the emitting end 1 sequentially passes through the first lens 2, the isolator 3, the second lens 4, the 45-degree wave plate 5 and the third lens 6. By adopting the combination of the first lens 2, the isolator 3, the second lens 4, the 45-degree wave plate 5 and the third lens 6, the light rays emitted by the emitting end 1 finally irradiate the end face of the third lens 6 in the form of parallel light, and the light beams are focused on the fiber end face of the tail fiber 12, so that the controllability of the focal length of the light beams is realized, the total length tolerance of the BOSA component is reduced, the production cost is reduced, and the power loss is reduced.

Referring to fig. 1, a BOSA optical device further includes a 0 ° wave plate 8 disposed between the receiving end 7 and the 45 ° wave plate 5. The 0 ° wave plate 8 mainly functions as a filter.

Referring to fig. 1, a BOSA optical device further includes: the support 9 is sleeved outside the transmitting end 1, the first lens 2 is fixedly arranged inside the support 9, and the isolator 3 is arranged on the support 9; the square seat 10 is matched with the support 9, the second lens 4 is fixedly arranged on the inner side of the square seat 10, and the 45-degree wave plate 5, the 0-degree wave plate 8 and the receiving end 7 are fixedly arranged on the square seat 10; and an adjusting ring 11 connected to an end of the square base 10 away from the support 9, wherein the third lens 6 is fixedly disposed on the adjusting ring 11.

Referring to fig. 2, an angle formed by the mirror surface of the 45 ° wave plate 5 and the center line of the isolator 3 is 45 °, an angle formed by the other mirror surface of the 45 ° wave plate 5 and the center line of the third mirror plate is 45 °, and an angle formed by the other mirror surface of the 45 ° wave plate 5 and the center line of the receiving end 7 is 45 °.

An antireflection film is arranged on the mirror surface of the 45-degree wave plate 5 close to one side of the isolator 3, and a reflection film is arranged on the mirror surface of the 45-degree wave plate 5 close to one side of the third lens 6.

Referring TO fig. 1, the first lens 2 is a TO-CAN cap with a focusing lens, and the focusing lens is a biconvex spherical positive lens or an aspheric positive lens; the lens curvatures from left to right are R1 and R2, respectively, where 0.5< R1< 8; -2.5< R2< -0.5, and the lens refractive index can be 1.45-1.95.

Referring to fig. 1, the second lens 4 is a collimating lens, and the second lens 4 is a biconvex, plano-convex or meniscus spherical positive lens or an aspheric positive lens, and is made of a glass lens or a silicon lens, and has a refractive index of 1.45-3.6. In this embodiment, the second lens 4 is a biconvex aspheric silicon lens.

The third lens 6 is a C-lens or a G-lens. Referring to fig. 1, the third lens 6 is a C-lens.

The utility model provides a pair of BOSA optical device's theory of operation does:

the LD chip 13 of the transmitting end 1 emits a light beam, and the light beam is refracted twice by the first lens 2 because the first lens 2 is a biconvex lens; the light beam enters the separator 3 in the form of divergent light, and the light beam is not refracted in the separator 3; because the second lens 4 is a biconvex lens, the light beam enters the 45-degree wave plate 5 in the form of parallel light after being refracted twice by the second lens 4; then, the light beam is refracted twice by the inclined 45-degree wave plate 5, and finally irradiates the end face of the third lens 6 in the form of parallel light, and the light beam is refracted by the third lens 6 and is focused on the fiber end face of the tail fiber 12, so that most of the light beam emitted from the emitting end 1 can finally enter the fiber core of the tail fiber 12;

when the light beam in the tail fiber 12 is recovered, the recovered light beam passes through the third lens 6 from the tail fiber 12 and is emitted to the reflecting surface of the 45-degree wave plate 5 in the form of parallel light, and because the reflecting surface of the 45-degree wave plate 5 is provided with a reflecting film, the light beam enters the 0-degree wave plate 8 for filtering after being reflected by the 45-degree wave plate 5 and finally enters the receiving end 7; if some of the recycling beams are refracted through the 45 ° wave plate 5, the recycling beams refracted through the 45 ° wave plate 5 are isolated by the isolator 3 due to the configuration of the isolator 3, so that the recycling beams do not affect the transmitting end 1.

The working principle, working process and the like of the present embodiment can refer to the corresponding contents of the foregoing embodiments.

The same or similar parts in the above embodiments in this specification may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments, but the differences are not limited to be replaced or superimposed with each other.

The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same. It will be understood by those skilled in the art that any modification and equivalent arrangement that do not depart from the spirit and scope of the invention should fall within the scope of the claims of the invention.

Claims

1. A BOSA optical device, comprising:

a transmitting end for transmitting a light beam;

the first lens is arranged on one side of the emission end;

the isolator is arranged on one side of the first lens, which is far away from the emission end;

the second lens is arranged on one side of the isolator, which is far away from the first lens;

a 45-degree wave plate obliquely arranged on one side of the second lens away from the isolator;

the third lens is arranged on one side of the 45-degree wave plate, which is far away from the second lens;

the receiving end is arranged beside the 45-degree wave plate;

the light beam emitted by the emitting end sequentially passes through the first lens, the isolator, the second lens, the 45-degree wave plate and the third lens.

2. The BOSA optical device of claim 1, further comprising a 0 ° wave plate disposed between the receiving end and the 45 ° wave plate.

3. The BOSA optical device of claim 2, further comprising:

the support is sleeved outside the transmitting end, the first lens is fixedly arranged inside the support, and the isolator is arranged on the support;

the square seat is matched with the support, the second lens is fixedly arranged on the inner side of the square seat, and the 45-degree wave plate, the 0-degree wave plate and the receiving end are fixedly arranged on the square seat; and

the adjusting ring is connected to one end, far away from the support, of the square base, and the third lens is fixedly arranged on the adjusting ring.

4. The BOSA optical device according to claim 1, wherein the mirror surface of the 45 ° wave plate forms an angle of 45 ° with the center line of the isolator, the other mirror surface of the 45 ° wave plate forms an angle of 45 ° with the center line of the third lens, and the other mirror surface of the 45 ° wave plate forms an angle of 45 ° with the center line of the receiving end.

5. The BOSA optical device according to claim 1, wherein a mirror surface of the 45 ° wave plate near the isolator is provided with an antireflection film, and a mirror surface of the 45 ° wave plate near the third lens is provided with a reflection film.

6. The BOSA optical device according TO claim 1, wherein the first lens is a TO-CAN cap with a focusing lens.

7. The BOSA optical device of claim 1, wherein the second lens is a collimating lens.

8. The BOSA optical device according to claim 1, wherein said third lens is a C-lens.

9. The BOSA optical device according to claim 1, wherein the third lens is a G-lens.