CN210168050U

CN210168050U - Light receiving device and optical communication apparatus

Info

Publication number: CN210168050U
Application number: CN201921442110.8U
Authority: CN
Inventors: 林桂光; 司马卫武
Original assignee: Guangdong Guangzhi Communication Technology Co Ltd
Current assignee: Guangdong Guangzhi Communication Technology Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-03-20
Anticipated expiration: 2029-08-30

Abstract

The utility model discloses a light receiving device, including tube socket, pipe cap, lens, PD chip, TIA chip, a plurality of electric capacity and a plurality of resistance, the through-hole that runs through its upper and lower surface is seted up to the top intermediate position of pipe cap, and lens are located the through-hole directly over or locate the through-hole, and TIA chip, a plurality of electric capacity and a plurality of resistance subsides are established at the upper surface of tube socket, and the intermediate position of tube socket is established by its upper surface undercut and is formed with the holding recess, and the PD chip subsides are established on the diapire of holding recess and just to setting up with lens. Additionally, the utility model also discloses an optical communication device. The utility model discloses under the condition that the distance between the lens at PD chip and pipe cap top satisfies the focus requirement of lens, can make the axial dimensions of pipe cap littleer, realized the miniaturized design of pipe cap, and then realized light receiving device's miniaturized design. Meanwhile, the PD chip is arranged in the accommodating groove, and the groove wall of the accommodating groove surrounds the PD chip, so that the interference is reduced.

Description

Light receiving device and optical communication apparatus

Technical Field

The utility model relates to an optical communication technical field especially relates to a light receiving device and optical communication device.

Background

With the rapid development of optical fiber communication technology, especially the rapid development of high-speed local area networks, optical fiber access networks and cable television systems, optical devices such as optical receiving devices are also more widely applied in optical fiber systems. The light receiving device generally includes a stem, a cap, a lens, a PD chip (Photo-Diode), a TIA chip (Trans-impedance amplifiers), and the like, where the PD chip and the TIA chip are disposed on an upper surface of the stem, and the PD chip is opposite to the lens disposed on the cap to receive light condensed by the lens, so as to perform photoelectric conversion.

In order to ensure the light receiving effect of the TIA chip, the distance between the lens located at the top of the tube cap and the PD chip located on the upper surface of the tube seat needs to meet the focal length requirement of the lens. In the prior art, the distance between the lens and the PD chip is ensured to meet the requirement by adopting a tube cap with a larger axial dimension. However, this method of using a cap having a large axial dimension also results in an excessively large volume and an increase in cost of the light emitting device as a whole.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a little and can satisfy the light receiving element that the focus of lens required of size.

Another object of the present invention is to provide an optical communication apparatus, the size of the light receiving device is small and can satisfy the focal length requirement of the lens.

In order to achieve the above object, the utility model provides a light receiving device, including tube socket, tube cap, lens, PD chip, TIA chip, a plurality of electric capacity and a plurality of resistance, the through-hole that runs through its upper and lower surface is seted up to the top intermediate position of tube cap, lens are located directly over the through-hole or locate the through-hole, TIA chip, a plurality of electric capacity and a plurality of resistance subsides are established the upper surface of tube socket, the intermediate position of tube socket is established by its upper surface undercut and is formed with the holding recess, the PD chip subsides are established on the diapire of holding recess and with lens is just to setting up.

Preferably, the upper surface of the pipe cap is provided with a mounting frame, the mounting frame is provided with a mounting hole penetrating through the upper surface and the lower surface of the mounting frame, the mounting hole is opposite to the through hole, and the lens is arranged in the mounting hole.

Preferably, the upper surface of the PD chip is flush with the upper surface of the stem.

Preferably, the accommodating groove is rectangular, and a gap is formed between the PD chip and a side wall of the accommodating groove.

Preferably, the TIA chip is attached to the upper surface of the tube seat at a position adjacent to the accommodating groove.

To achieve the above another object, the present invention provides an optical communication apparatus including a light receiving device as described above.

Compared with the prior art, the utility model discloses light receiving device's TIA chip, electric capacity and resistance paste establish the upper surface at the tube socket, and the intermediate position of tube socket is established to the undercut and is formed with the holding recess, the PD chip pastes to be established on the diapire of holding recess and just right with lens, the position that comes the PD chip through this mode moves down, distance between the lens at PD chip and tube cap top satisfies under the condition that the focus of lens required, can do the axial dimension of tube cap littleer, the miniaturized design of tube cap has been realized, and then realized light receiving device's miniaturized design, be favorable to reducing light receiving device's manufacturing cost. Meanwhile, the PD chip is arranged in the accommodating groove, and the groove wall of the accommodating groove surrounds the PD chip, so that the interference is reduced.

Drawings

Fig. 1 is a cross-sectional view of a light receiving device according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of the layout of PD chip, TIA chip, capacitor and resistor on the tube seat.

Fig. 3 is a sectional view of a light receiving device according to another embodiment of the present invention.

Detailed Description

In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "axial", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and thus, the present invention should not be construed as being limited to the protection of the present invention.

Please refer to fig. 1 to 3, the utility model discloses a light receiving device 100, including tube socket 1, tube cap 2, lens 3, PD chip 4, TIA chip 5, a plurality of

electric capacity

61, 62 and a plurality of resistance 7, the through-hole 21 that runs through its upper and lower surface is seted up to the top intermediate position of tube cap 2, lens 3 is located through-hole 21 directly over or locates through-hole 21, TIA chip 5, a plurality of electric capacity 61, 62 a plurality of resistance 7 subsides are established at the upper surface of tube socket 1, the intermediate position of tube socket 1 is formed with holding groove 11 by its upper surface downwardly concave establishment, PD chip 4 pastes and establishes on holding groove 11's diapire and just to setting up with lens 3.

The socket 1 of the light receiving device 100 shown in fig. 1 to fig. 3 includes a first power supply pin 12, a second power supply pin 13 and two output pins 14, wherein the first power supply pin 12 is electrically connected to the TIA chip 5 through a wire to supply power to the TIA chip 5, the second power supply pin 13 is electrically connected to the PD chip 4 through a wire to supply power to the PD chip 4, the two output pins 14 are electrically connected to the TIA chip 5, the TIA chip 5 is electrically connected to output pins (not shown) of the PD chip 4, the PD chip 4 converts a received optical signal into an electrical signal and outputs the electrical signal to the TIA chip 5, and the TIA chip 5 amplifies the electrical signal and outputs the electrical signal to the two output pins 14. The light receiving device 100 is provided with two

capacitors

61, 62 and a resistor 7, wherein one end of one capacitor 61 is connected with the second power supply pin 13, and the other end is grounded, and the capacitor 61 is used for filtering noise; and another capacitor 62 and the resistor 7 constitute a voltage stabilizing circuit and are connected between the second power supply pin 13 and the PD chip 4 to stabilize the power supply voltage. Of course, the arrangement shown in fig. 1 to 3 is only for illustrating the solution of the present invention, and the specific implementation is not limited in this way.

Referring to fig. 2, the TIA chip 5 is attached to the upper surface of the socket 1 adjacent to the receiving groove 11. Through setting up TIA chip 5 in the position of neighbouring holding recess 11, reduced the distance between PD chip 4 and TIA chip 5, shorten the routing length between PD chip 4 and TIA chip 5, be convenient for be connected PD chip 4 and TIA chip 5 electricity. Furthermore, the upper surface of the PD chip 4 is flush with the upper surface of the tube seat 1, so that the distance between the PD chip 4 and the TIA chip 5 is further reduced; meanwhile, the distance between the PD chip 4 and the capacitor 62 and the resistor 7 is reduced, the routing length between the PD chip and the capacitor 62 and the resistor 7 is shortened, and the PD chip 4 is conveniently and electrically connected with the capacitor 62 and the resistor 7.

Referring to fig. 1 and 2, the accommodating recess 11 is rectangular, and a gap S is formed between the PD chip 4 and the sidewall of the accommodating recess 11. By this design, an operation space is reserved so as to attach the PD chip 4 to the accommodating recess 11 or remove the PD chip 4 from the accommodating recess 11.

Referring to fig. 3, in an embodiment, the upper surface of the cap 2 is further provided with a mounting frame 8, the mounting frame 8 is provided with a mounting hole 81 penetrating through the upper and lower surfaces of the mounting frame 8, the mounting hole 81 is opposite to the through hole 21, and the lens 3 is mounted in the mounting hole 81. Compared with the way of directly installing the lens 3 in the through hole 21 shown in fig. 1, the embodiment installs the lens 3 by providing the mounting frame 8 to raise the lens 3, and under the condition that the distance between the lens 3 and the PD chip 4 satisfies the focal length requirement of the lens 3, the axial dimension of the cap 2 can be further made smaller, thereby further realizing the miniaturized design of the light receiving device 100. Specifically, the aperture of the mounting hole 81 is gradually increased from bottom to top, the lens 3 is mounted on the upper portion of the mounting hole 81, and the lens 3 abuts against the hole wall of the mounting hole 81.

Compared with the prior art, the utility model discloses light-receiving device 100's TIA chip 5,

electric capacity

61, 62 and resistance 7 paste and establish the upper surface at tube socket 1, and tube socket 1's intermediate position is established to the undercut and is formed with holding recess 11, PD chip 4 pastes and establishes on holding recess 11's diapire and just right with lens 3, come PD chip 4's position to move down through this mode, distance between the lens 3 at the top of PD chip 4 and tube cap 2 satisfies under the condition that the focus required of lens 3, can do tube cap 2's axial dimension littleer, realized the miniaturized design of tube cap 2, and then realized light-receiving device 100's miniaturized design, be favorable to reducing light-receiving device 100's manufacturing cost. Meanwhile, as the PD chip 4 is arranged in the accommodating groove 11, the groove wall of the accommodating groove 11 surrounds the PD chip 4, and the effect of reducing interference is also achieved.

The above disclosure is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the scope of the present invention is not limited to the above embodiments.

Claims

1. The utility model provides a light receiving device, its characterized in that, includes tube socket, tube cap, lens, PD chip, TIA chip, a plurality of electric capacity and a plurality of resistance, the through-hole that runs through its upper and lower surface is seted up to the top intermediate position of tube cap, lens are located directly over the through-hole or locate the through-hole, TIA chip, a plurality of electric capacity and a plurality of resistance subsides are established the upper surface of tube socket, the intermediate position of tube socket is established by its upper surface downwardly concave and is formed with the holding recess, the PD chip subsides are established on the diapire of holding recess and with lens just to setting up.

2. The light-receiving device according to claim 1, wherein a mounting frame is provided on an upper surface of the cap, the mounting frame having a mounting hole formed through an upper surface and a lower surface thereof, the mounting hole facing the through hole, and the lens being mounted in the mounting hole.

3. The light-receiving device according to claim 1, wherein an upper surface of the PD chip is flush with an upper surface of the stem.

4. The light receiving device according to claim 1, wherein the receiving recess has a rectangular shape, and a gap is provided between the PD chip and a side wall of the receiving recess.

5. The light receiving device of claim 1, wherein the TIA chip is attached to an upper surface of the stem adjacent to the receiving recess.

6. An optical communication apparatus comprising a light receiving device, characterized in that the light receiving device is as claimed in any one of claims 1 to 5.