CN112213834A

CN112213834A - Optical sub-module

Info

Publication number: CN112213834A
Application number: CN202011153872.3A
Authority: CN
Inventors: 周啸峰; 冉崇竹; 孙全意; 陶世民; 高强强; 华伟
Original assignee: Hubei Xiangyao Electronic Technology Co ltd
Current assignee: Hubei Xiangyao Electronic Technology Co ltd
Priority date: 2020-10-26
Filing date: 2020-10-26
Publication date: 2021-01-12

Abstract

The invention provides an optical submodule which comprises a light receiving submodule, a light emitting submodule and an adapter, wherein the light receiving submodule, the light emitting submodule and the adapter are packaged through a square connecting sleeve, and the top of the square connecting sleeve is provided with a first limiting groove for installing the adapter; a second limit groove for installing the light emission secondary module is formed in the bottom of the square connecting sleeve, and a third limit groove for connecting the light reception secondary module is formed in one side of the square connecting sleeve; a cylindrical hole communicated with the through hole and the rectangular notch is vertically formed in the middle of the square connecting sleeve, and a ball lens is fixedly mounted in the cylindrical hole; the light emission secondary module comprises a TO base, four pins and a top surface are arranged on the TO base, an LD chip and a PD chip are mounted on the top surface through eutectic welding, the LD chip and the PD chip are communicated with the pins through connecting wires, and the LD chip and the PD chip are matched with an inner cavity of a second limiting groove. The invention has simple structure, reduces material cost and improves assembly precision.

Description

Optical sub-module

Technical Field

The invention relates to the technical field of optical modules, in particular to an optical submodule.

Background

The optical module is an important component in an optical communication system, and has the function of simply realizing photoelectric conversion. In the process of long-distance signal transmission, when an electric signal is transmitted to a transmitting end of an optical module, the electric signal is converted into an optical signal, and the optical signal is transmitted to the optical module at the opposite end through an optical fiber; after receiving optical signals of other optical modules through optical fibers, the receiving end of the optical module converts the optical signals into electric signals, so that the long-distance transmission of the signals can be realized.

The Optical module is mainly composed of an Optical Subassembly (OSA) and a functional circuit (i.e., a circuit board assembly). The optical secondary module is electrically connected with the circuit board assembly, the circuit board assembly is connected with an external upper computer to realize power supply and electric signal transmission, and the optical secondary module is connected with light transmission media such as external optical fibers to realize light transmission. The Optical Subassembly mainly includes a Transmitter Optical Subassembly (TOSA), a Receiver Optical Subassembly (ROSA), and a Bi-directional Optical Subassembly (BOSA).

The common transmitter optical subassembly module comprises a TO base and a pipe cap, wherein the TO base is used for fixing the mounting position of a chip in a load-bearing TO-can and providing a pin connected with the outside TO ensure that an electric signal is provided for a packaging element, and the pipe cap is used for forming a sealed space TO protect the chip and ensure the smooth transmission of an optical signal; when assembling, through with pipe cap welded fastening TO TO base, fix and impress square adapter sleeve afterwards, weld square adapter sleeve and TO base, the production procedure is long, and the material cost is high, and because each part all can have the axiality tolerance man-hour in addition, therefore the part is more, and accumulative total axiality tolerance is big more, directly influences the coupling efficiency of light.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides an optical submodule, which solves the problems of long production process and high material cost in the prior art.

According to the embodiment of the invention, the optical submodule comprises a light receiving submodule, a light emitting submodule and an adapter, wherein the light receiving submodule, the light emitting submodule and the adapter are packaged through a square connecting sleeve, a first limiting groove used for installing the adapter is formed in the top of the square connecting sleeve, a 45-degree inclined plane is formed in the bottom of the first limiting groove, and a through hole is formed in the inclined plane in a penetrating mode and used for fixedly installing a first wave plate;

a second limiting groove for mounting the light-emitting secondary module is formed in the bottom of the square connecting sleeve, a third limiting groove for connecting the light-receiving secondary module is formed in one side of the square connecting sleeve, a rectangular notch is vertically formed in the bottom of the third limiting groove, and a second wave plate is fixedly mounted at the rectangular notch;

the middle part of the square connecting sleeve is vertically provided with a cylindrical hole communicated with the through hole and the rectangular notch, a ball lens is fixedly arranged in the cylindrical hole, and the square connecting sleeve is divided into three relatively independent spaces by the first wave plate, the second wave plate and the ball lens;

the light emission secondary module comprises a TO base, four pins are arranged on the TO base, the top surface of the TO base is pasted with an LD chip and a PD chip through eutectic welding, the LD chip and the PD chip are communicated with the pins through connecting wires, and the LD chip and the PD chip are matched with the inner cavity of the second limiting groove.

Compared with the prior art, the invention has the following beneficial effects:

through the structure of improving square adapter sleeve, specifically through offering the second spacing groove that is used for installing the optical emission inferior module in square adapter sleeve bottom, the optical emission inferior module includes the TO base, stretch into the second spacing inslot and with TO base and square adapter sleeve fixed mounting with TO base top surface position, the cylinder hole has been seted up at square adapter sleeve middle part, the downthehole fixed installation ball lens of cylinder, the optical emission inferior module converts the signal of telecommunication into optical signal through adding power, and through ball lens focus and launch TO the adapter, moreover, the steam generator is simple in structure, the installation of TO base with the pipe cap has been reduced, the material cost is reduced, the assembly precision is improved.

Drawings

Fig. 1 is a schematic structural diagram of a main body according to an embodiment of the present invention.

Fig. 2 is a schematic view of an installation structure of the tosa and the square connecting sleeve according to the present invention.

Fig. 3 is a schematic structural view of a square connecting sleeve in the invention.

Fig. 4 is a schematic structural diagram of the tosa of the present invention.

In the above drawings: 1. a light receiving sub-module; 2. a light emission submodule; 20. a TO base; 21. a pin; 22. an LD chip; 23. a PD chip; 3. an adapter; 4. a square connecting sleeve; 40. a first limit groove; 41. a port; 42. a first wave plate; 43. a second limit groove; 44. a third limiting groove; 45. a rectangular notch; 46. a second wave plate; 47. a cylindrical bore; 48. a ball lens; 49. and a seal welding part.

Detailed Description

The technical solution of the present invention is further explained with reference to the drawings and the embodiments.

As shown in fig. 1-4, an embodiment of the present invention provides an optical sub-module, which includes a light-receiving sub-module 1, a light-emitting sub-module 2, and an adapter 3, where the light-receiving sub-module 1, the light-emitting sub-module 2, and the adapter 3 are packaged by a square connecting sleeve 4, a first limiting groove 40 for installing the adapter 3 is formed at the top of the square connecting sleeve 4, a 45 ° inclined surface is formed at the bottom of the first limiting groove 40, and a through hole 41 is formed through the inclined surface for fixedly installing a first wave plate 42;

a second limiting groove 43 for installing the transmitter optical subassembly 2 is formed in the bottom of the square connecting sleeve 4, a third limiting groove 44 for connecting the receiver optical subassembly 1 is formed in one side of the square connecting sleeve 4, a rectangular notch 45 is vertically formed in the bottom of the third limiting groove 44, and a second wave plate 46 is fixedly installed at the rectangular notch 45;

a cylindrical hole 47 communicated with the through port 41 and the rectangular notch 45 is vertically formed in the middle of the square connecting sleeve 4, a ball lens 48 is fixedly installed in the cylindrical hole 47, and the square connecting sleeve 4 is divided into three relatively independent spaces by the first wave plate 42, the second wave plate 46 and the ball lens 48;

the light emission secondary module 2 comprises a TO base 20, four pins 21 are arranged on the TO base 20, the top surface of the TO base 20 is attached with an LD chip 22 and a PD chip 23 through eutectic welding, the LD chip 22 and the PD chip 23 are communicated with the pins 21 through connecting wires, and the LD chip 22 and the PD chip 23 are matched with the inner cavity of the second limiting groove 43.

Specifically, the first waveplate 42 receives the optical signal with a wavelength of 1310nm and filters the optical signal with a wavelength of 1490nm, and the second waveplate 46 transmits the optical signal reflected by the first waveplate 42.

The square connecting sleeve 4 and the TO base 20 are both made of powder alloy, and the square connecting sleeve 4 and the TO base 20 are fixedly welded.

In the above scheme, by arranging the square connecting sleeve 4, the top of the square connecting sleeve 4 is provided with the first limiting groove 40, the bottom of the first limiting groove 40 is a 45-degree inclined plane, the inclined plane is provided with the through hole 41, the through hole 41 is fixedly provided with the first wave plate 42, one side of the square connecting sleeve 4 is provided with the third limiting groove 44, the bottom of the third limiting groove 44 is vertically provided with the rectangular notch 45, the rectangular notch 45 is fixedly provided with the second wave plate 46, the first wave plate 42 and the second wave plate 46 play a role of filtering, the first wave plate 42 is 45 degrees, the second wave plate 46 is 0 degree, the bottom of the square connecting sleeve 4 is provided with the second limiting groove 43, the light emission secondary module 2 comprises the TO base 20, the upper end of the TO base 20 is positioned in the second limiting groove 43, and the connecting part between the TO base 20 and the square connecting sleeve 4 is welded and fixed, because the powder alloy material has good powder flowability, the TO base 20 and the square connecting sleeve, the service life of the device is effectively ensured; the middle part of the square connecting sleeve 4 is provided with a cylindrical hole 47, a ball lens 48 is arranged in the cylindrical hole 47, when the optical transceiver module works, the optical transceiver module 2 converts an electric signal into an optical signal by electrifying, the optical signal is focused by the ball lens 48, the first wave plate 42 filters the optical signal with the wavelength of 1490nm, the optical signal with the wavelength of 1310nm is transmitted TO the adapter 3 through the first wave plate 42, the adapter 3 transfers the light into an optical fiber and is incident TO the first wave plate 42, the first wave plate 42 receives the optical signal with the wavelength of 1310nm and reflects the optical signal TO the second wave plate 46, the second wave plate 46 transmits the optical signal reflected by the first wave plate 42, so that the optical signal is transmitted TO the optical transceiver module 1, thereby realizing photoelectric conversion, the structure is simple, the working procedures of welding the tube cap, the tube cap and the TO base 20 are reduced by arranging the ball lens 48 in the middle part of the square connecting sleeve 4 and arranging the upper end of the TO base 20, greatly reduced material cost and manufacturing cost, improved the axiality of ball lens 48 and TO base 20 installation, promoted the product quality, effectively guaranteed the coupling efficiency of light.

In the above scheme, as shown in fig. 3, a preferred structure of the square connecting sleeve 4 is that a raised sealing part 49 is arranged at the bottom of the square connecting sleeve 4, the sealing part 49 is annular, and the sealing part 49 is welded with the top surface of the TO base 20 into a whole through energy storage welding. The longitudinal section of the seal welding part 49 is in an equilateral triangle shape, and the vertex angle is downward. The height of the seal welding part 49 is 0.25-0.4 mm. Square adapter sleeve 4 and TO base 20 weld through the energy storage welding and fix, specifically through set up annular sealing part 49 at square adapter sleeve 4 top, in welding process, sealing part 49 melts and bonds with TO base 20, sealing part 49's longitudinal section makes for the equilateral triangle that the apex angle is down TO melt more evenly, it reaches the effect of metallurgical combination TO make the welding point, and then make square adapter sleeve 4 and TO base 20 be connected stably, through setting up sealing part 49 and reduce the influence of heat and pressure when sealing TO TO base 20 upper element, it is preferred, sealing part 49 highly is 0.25 mm.

In the above solution, the ball lens 48 and the cylindrical hole 47, the first wave plate 42 and the through hole 41, and the second wave plate 46 and the rectangular notch 45 are fixed by airtight adhesive. The installation is simple, and the gas tightness is good.

In the above solution, as shown in fig. 2, the ball lens 48 and the PD chip 23 are located on the same axis. The diameter of the cylindrical hole 47 is 1 to 1.3 mm and the diameter of the ball lens 48 is 1.4 to 1.6 mm. The ball lens 48 and the TO base 20 are good in coaxiality, the circular periphery of the cylindrical hole 47 is in contact with the circular periphery with the corresponding diameter on the ball lens 48, the light gathering effect of the ball lens 48 is effectively guaranteed, the ball lens 48 is kept at a lower position relative TO the TO base 20 through the cylindrical hole 47 with the smaller diameter, and the focusing effect is good.

As shown in fig. 3, in the above solution, the second limiting groove 43 includes a straight hole at the lower end and a tapered hole at the upper end of the straight hole, and the inner diameter of the lower end of the tapered hole is greater than the inner diameter of the upper end. The taper hole plays a guiding role, so that the optical signal is gathered, the optical signal is better absorbed by the ball lens 48, and the optical signal transmission effect is good.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the 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 addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.

Claims

1. The utility model provides an optical submodule, includes optical reception submodule, optical emission submodule and adapter, optical reception submodule, optical emission submodule and adapter pass through square adapter sleeve encapsulation, its characterized in that: the top of the square connecting sleeve is provided with a first limiting groove for mounting the adapter, the bottom of the first limiting groove is provided with a 45-degree inclined plane, and the inclined plane is provided with a through hole in a penetrating manner so as to be used for fixedly mounting the first wave plate;

2. An optical sub-assembly as in claim 1, wherein: the first wave plate receives the optical signal with 1310nm wavelength and filters the optical signal with 1490nm wavelength, and the second wave plate transmits the optical signal reflected by the first wave plate.

3. An optical sub-assembly as claimed in claim 2, wherein: the square connecting sleeve and the TO base are both made of powder alloy and are welded and fixed with the TO base.

4. An optical sub-assembly as claimed in claim 3, wherein: the square connecting sleeve is characterized in that a protruding sealing part is arranged at the bottom of the square connecting sleeve, and the sealing part is annular and is welded with the top surface of the TO base into a whole through energy storage welding.

5. The optical subassembly of claim 4, wherein: the longitudinal section of the sealing part is in an equilateral triangle shape, and the vertex angle is downward.

6. The optical subassembly of claim 4, wherein: the height of the seal welding part is 0.25-0.4 mm.

7. An optical sub-assembly as claimed in claim 2, wherein: the ball lens and the cylindrical hole, the first wave plate and the through hole, and the second wave plate and the rectangular notch are fixed through airtight glue.

8. An optical sub-assembly as claimed in claim 2, wherein: the ball lens and the PD chip are located on the same axis.

9. The optical subassembly of claim 8, wherein: the diameter of the cylindrical hole is 1-1.3 mm and the diameter of the ball lens is 1.4-1.6 mm.

10. An optical sub-assembly as claimed in claim 2, wherein: the second limiting groove comprises a straight hole at the lower end and a taper hole at the upper end of the straight hole, and the inner diameter of the lower end of the taper hole is larger than that of the upper end of the taper hole.