CN115315905A - Optical device and optical module - Google Patents

Abstract

The application discloses optical device and optical module, concretely relates to high-speed optical communication technical field. The optical device includes a light transmitting assembly, a light receiving assembly, a first flexible board, a second flexible board, and a third flexible board; the light sending assembly and the light receiving assembly are arranged in a stacked mode, a first radio frequency circuit electrically connected with the light sending assembly is arranged on the first flexible board, and a second radio frequency circuit electrically connected with the light receiving assembly is arranged on the second flexible board; the third flexible board comprises a first connecting part, a second connecting part and an extension part, wherein a first direct current circuit is formed on the first connecting part, a second direct current circuit is formed on the second connecting part, and the first connecting part is bent relative to the second connecting part so that the first direct current circuit is electrically connected with the light sending assembly and the second direct current circuit is electrically connected with the light receiving assembly; the extension portion is provided with a first board-to-board connector which is electrically connected with the first direct current circuit and the second direct current circuit respectively. The optical device can meet the requirement of miniaturization design and packaging of the optical module.

Description

Optical device and optical module Technical Field

The present application relates to the field of high-speed optical communication technologies, and in particular, to an optical device and an optical module.

Background

The optical module is generally formed by assembling a photoelectronic device, a functional circuit, a hardware circuit for encapsulating software, a structural member and the like through processes, and mainly realizes the conversion of an electric signal into an optical signal and the conversion of the optical signal into the electric signal. With the development of science and technology, the packaging volume of an optical module is smaller and smaller, and a 400G optical module is packaged from the early CFP (Ceramic flat packages) without multi-source agreement requirements to the CFP8 package meeting the multi-source agreement, and then to the multi-source agreement package meeting the QSFP-DD (Quad small form-double pluggable) requirement, so that the total packaging space is reduced by about 74%. Certainly, with the reduction of the packaging volume of the optical module, the requirement on the packaging of the optical device is higher and higher, and a higher requirement is also put forward on the design of the optical device.

In order to reduce the packaging size of the optical device, the light emitting device and the light receiving device can be combined together through a lamination design, but in the prior art, a radio frequency circuit and a direct current circuit in the optical device share the same circuit board, so that the problem of mixing a high-speed electric signal of the radio frequency circuit with a direct current signal and the problem of heat dissipation of the optical device exist; if the independent light emitting device and the independent light receiving device are subjected to special structure processing and then are sealed into a structure, a double-pad circuit board is needed to be adopted to integrate respective radio frequency circuits and direct current circuits of the light emitting device and the light receiving device onto one circuit board, so that the assembly of the circuit board with a printed circuit board of a light module is facilitated, and the light device has the problems of high design difficulty, poor stability, poor reliability and poor producibility; in addition, the optical device package is only suitable for an optical module with a simple control circuit, all circuit layouts are limited to a single PCB, and the optical device package is not suitable for an optical module with a complex control circuit and cannot be arranged on the single PCB at all.

Therefore, the design of the optical device of the current adaptive 400G optical module has many problems, and the design requirement of the miniaturized package of the optical module cannot be met.

Disclosure of Invention

The application provides an optical device and an optical module, and the optical device can meet the requirement of the miniaturized package design of the optical module.

In a first aspect, the present application provides an optical device, specifically including an optical transmission assembly, an optical reception assembly, a first flexible board, a second flexible board, and a third flexible board; the light sending component and the light receiving component are arranged in a stacked mode, so that space can be saved, the first flexible board is provided with a first radio frequency circuit electrically connected with the light sending component, and the first radio frequency circuit can modulate a base frequency signal of the light sending component into a radio frequency signal and emit the radio frequency signal; the second flexible board is provided with a second radio frequency circuit electrically connected with the light receiving component, and the second radio frequency circuit can convert external radio frequency signals into base frequency signals for the light receiving component to receive; the first flexible board and the second flexible board can make the radio frequency signals of the light sending component and the light receiving component independent; the direct current signals of the light sending assembly and the light receiving assembly are realized by the same third flexible board, the third flexible board comprises a first connecting part, a second connecting part and an extension part, a first direct current circuit is arranged on the first connecting part, a second direct current circuit is arranged on the second connecting part, a first board-to-board connector is arranged on the extension part, and the first board-to-board connector is respectively and electrically connected with the first direct current circuit and the second direct current circuit; because the third flexible board is a flexible structure, the first connecting part can be bent relative to the second connecting part, so that the first direct current circuit on the first connecting part is electrically connected with the light sending component, and the second direct current circuit on the second connecting part is electrically connected with the light receiving component, so that direct current power supply or monitoring signals of the light sending component and the light receiving component are converged on the third flexible board; when the optical device is in butt joint with the printed circuit board interface of the optical module, the direct current power supply or the monitoring signal converged on the third flexible board can be transmitted to the printed circuit board interface of the optical module through the first board-to-board connector, and the requirements of a complex control circuit and more monitoring signals can be met.

The optical device is characterized in that an optical transmitting assembly and an optical receiving assembly of a radio frequency circuit are connected through a foldable third flexible board to form the optical device integrating light transmitting and receiving, radio frequency signals and direct current signals are separated, the problem of mixed interference of high frequency signals and direct current signals is solved, the requirements of a complex control circuit and more monitoring signals can be met, the optical device is upgraded to more channels or optical devices with larger capacities, and the requirements of miniaturization and packaging of optical modules can be met simply and conveniently (for example, a 400G optical module can be upgraded to an 800G optical module seamlessly).

In a possible implementation manner, the superposition of the light sending assembly and the light receiving assembly is implemented in a head-to-head and tail-to-tail manner, i.e. the head end of the light sending assembly is opposite to the head end of the light receiving assembly, and the tail end of the light sending assembly is opposite to the tail end of the light receiving assembly, so that other zero devices can be more conveniently arranged; the first flexible board is connected to the tail end of the optical sending assembly, the second flexible board corresponds to the first flexible board, and the second flexible board is connected to the tail end of the optical receiving assembly.

In a possible implementation manner, the head end of the optical transmitting assembly is provided with a first optical port, the head end of the optical receiving assembly is provided with a second optical port, and the first optical port and the second optical port are arranged side by side and are packaged in a structural member for connecting an optical fiber cable.

In a possible implementation manner, a first connecting protrusion is disposed at a tail end of the light sending assembly, a thickness of the first connecting protrusion is smaller than a thickness of the light sending assembly, correspondingly, a second connecting protrusion is disposed at a tail end of the light receiving assembly, a thickness of the second connecting protrusion is smaller than a thickness of the light receiving assembly, and an accommodating space for butting a printed circuit board interface of the optical module is formed between the first connecting protrusion and the second connecting protrusion, so that a butting of the optical device and the printed circuit board interface of the optical module is facilitated.

Specifically, the first flexible board is connected to one side of the first connecting protrusion facing the second connecting protrusion, the second flexible board is connected to one side of the second connecting protrusion facing the first connecting protrusion, and the first flexible board and the second flexible board are opposite to each other, so that the first radio frequency circuit and the second radio frequency circuit can be independently electrically connected to a printed circuit board interface of the optical module.

And the first connecting portion of the third flexible board is connected to one side, deviating from the second connecting protrusion, of the first connecting protrusion, and the second connecting portion of the third flexible board is connected to one side, deviating from the first connecting protrusion, of the second connecting protrusion, so that the first connecting portion, the first flexible board, the second flexible board and the second connecting portion are correspondingly arranged and distributed in a layered mode in sequence, and are conveniently butted with a printed circuit board interface of an optical module.

Here, the surface of the first connection protrusion facing away from the second connection protrusion may be made lower than the surface of the light transmission assembly facing away from the light receiving assembly, so that the first connection portion does not protrude from the surface of the light transmission assembly facing away from the light receiving assembly, facilitating electrical connection between the first connection portion and the light transmission assembly; correspondingly, the surface of the second connecting protrusion, which is away from the first connecting protrusion, can be lower than the surface of the light receiving assembly, which is away from the light sending assembly, so that the second connecting portion does not protrude from the surface of the light receiving assembly, which is away from the light sending assembly, and the second connecting portion is conveniently electrically connected with the light receiving assembly, so that after the light sending assembly, the light receiving assembly and the third flexible board are connected, the thickness of the whole optical device cannot be increased by the third flexible board, and the realization of package miniaturization is facilitated.

In a possible implementation manner, the first board-to-board connector disposed on the extension portion of the third flexible board corresponds to the first connection portion, and may also correspond to the second connection portion, specifically, the structure of the printed circuit board interface of the optical module to be docked is adjusted.

In a second aspect, the present application further provides an optical module, including a printed circuit board interface and any one of the optical devices, where the printed circuit board interface includes a first printed circuit board and a second printed circuit board, which are stacked and arranged to interface with the optical device; corresponding to a first board-to-board connector in the optical device, a second board-to-board connector is formed on the first printed circuit board, and when the interface of the printed circuit board is butted with the optical device, the second board-to-board connector is electrically connected with the first board-to-board connector; the second printed circuit board has the first connecting surface and the second connecting surface, the first connecting surface is formed with the first connecting circuit, the second connecting surface is formed with the second connecting circuit, the first connecting surface is used for connecting the first flexible board to electrically connect the first connecting circuit with the first radio frequency circuit, the base frequency signal of the light sending component can be converted into the radio frequency signal to be transmitted to the printed circuit board, the second connecting surface is used for connecting the second flexible board to electrically connect the second connecting circuit with the second radio frequency circuit, the high frequency signal of the printed circuit board can be transmitted to the light receiving component after being converted. In addition, grounding points are formed on the first connection surface and the second connection surface, respectively.

Drawings

Fig. 1 is a schematic structural diagram of an optical device provided in the present application;

fig. 2 is a schematic structural diagram of a folded state of a third flexible board in an optical device provided in the present application;

fig. 3 is a schematic structural diagram of an unfolded state of a third flexible board in an optical device provided by the present application;

fig. 4 is a schematic structural diagram illustrating a connection between an optical transmission assembly and a first flexible board and a connection between an optical reception assembly and a second flexible board in an optical device according to the present application;

FIG. 5 is a schematic diagram of the structure shown in FIG. 4 after being flipped;

FIG. 6 is a schematic view of the structure of FIG. 5 coupled to a third flexible sheet;

FIG. 7 is a schematic diagram of the structure shown in FIG. 6 after being flipped;

FIG. 8 is a schematic view of the second connecting portion of the third flexible board folded relative to the first connecting portion in the structure shown in FIG. 6;

FIG. 9 is a front view of an optical device provided herein;

FIG. 10 isbase:Sub>A schematic cross-sectional view taken along line A-A in FIG. 9;

fig. 11 is a schematic structural diagram of an optical module provided in the present application;

fig. 12 is a schematic structural diagram of a printed circuit board interface in an optical module according to the present application.

Reference numerals are as follows: 100-optical modules; 10-an optical device; 20-a printed circuit board interface; 1-a light transmitting assembly; 11-a first connecting projection; 12-a second coupling projection; 2-a light receiving component; 3-a first flexible sheet; 4-a second flexible sheet; 5-a third flexible sheet; 511-a first connection; 512-a second connection; 52-an extension; 61-a first optical port; 62-a second optical port; 7-a first board-to-board connector; 8-a first printed circuit board; 81-a second board-to-board connector; 9-a second printed circuit board; 91-ground point.

Detailed Description

As an important component of an optical module, the structure of an optical device has a great influence on the packaging of the optical module, and with the improvement of the packaging requirement of the optical module, a higher requirement is also put forward on the design of the optical device. The structure of the existing optical device is improved to reduce the size in order to reduce the packaging size, but other performance problems are brought, the multi-channel realization of the optical device is influenced, and the high requirement of the miniaturized packaging design of the optical device cannot be met.

Based on this, this application has proposed an optical device, has carried out rationalization setting to the structure of optical device for optical device can satisfy the miniaturized requirement of size, and the function of optical device is not influenced simultaneously, is favorable to realizing multichannel and the high capacity of optical device. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1, an optical device 10 provided in an embodiment of the present application includes an optical transmission assembly 1, an optical reception assembly 2, a first flexible board 3, a second flexible board 4, and a third flexible board 5; the optical transmitter module 1 and the optical receiver module 2 are stacked, and specifically, as shown in fig. 1, the optical transmitter module 1 and the optical receiver module 2 are arranged head to head, and tail to tail; as shown in fig. 1, the first flexible board 3, the second flexible board 4, and the third flexible board 5 are disposed at the rear ends of the optical transmitter module 1 and the optical receiver module 2. Here, the first flexible board 3 is provided with a first radio frequency circuit electrically connected with the optical transmitting assembly 1, the first radio frequency circuit can modulate a fundamental frequency signal of the optical transmitting assembly 1 to a radio frequency signal and transmit the same, correspondingly, the second flexible board 4 is provided with a second radio frequency circuit electrically connected with the optical receiving assembly 2, the second radio frequency circuit can convert an external radio frequency signal into a fundamental frequency signal for the optical receiving assembly 2 to receive, and the first flexible board 3 is separated from the second flexible board 4, so that the high-speed radio frequency signal separation of the optical transmitting assembly 1 and the optical receiving assembly 2 is facilitated; the independent design of the optical transmitting component 1 and the optical receiving component 2 can facilitate the layout of multi-path complex photoelectric devices in each optical component and the heat dissipation problem. The third flexible board 5 is connected to the light sending module 1 and the light receiving module 2 simultaneously in a folded three-dimensional structure, and a first direct current circuit and a second direct current circuit are formed on the third flexible board 5, wherein the first direct current circuit is electrically connected to the light sending module 1, and the second direct current circuit is electrically connected to the light receiving module 2, so as to converge the direct current signals or monitoring signals of the light sending module 1 and the light receiving module 2 onto the same flexible circuit board (i.e. the third flexible board 5); the third flexible board 5 is also provided with a first board-to-board connector 7, the first board-to-board connector 7 is respectively electrically connected with the first direct current circuit and the second direct current circuit, and the first board-to-board connector 7 can be connected with a printed circuit board interface of the optical module, so that the requirements of a complex control circuit and more monitoring signals can be met; the head end of the optical transmission assembly 1 is further provided with a first optical port 61, the head end of the optical reception assembly 2 is correspondingly provided with a second optical port 62, and the first optical port 61 and the second optical port 62 are arranged side by side and packaged in a structural member, so that the first optical port 61 and the second optical port 62 can be conveniently butted with an optical fiber cable.

Specifically, the structure of the third flexible board 5 is a folded state of the flexible circuit board, please refer to the folded structure diagram of the third flexible board 5 shown in fig. 2 and the unfolded structure diagram of the third flexible board 5 shown in fig. 3, where the third flexible board 5 includes a first connection portion 511, a second connection portion 512 and an extension portion 52, the first dc circuit is formed on the first connection portion 511, and the second dc circuit is formed on the second connection portion 512; the first connection portion 511 may be bent relative to the second connection portion 512 to a surface of the light sending assembly 1 in fig. 1 away from the light receiving assembly 2 so as to electrically connect the first dc circuit to the light sending assembly 1, and the second connection portion 512 may be bent relative to the first dc circuit to a surface of the light receiving assembly 2 in fig. 1 away from the light sending assembly 1 so as to electrically connect the second dc circuit to the light receiving assembly 2, where "bending" refers to a final folded state only and is not limited to a bending action in a connection process; here, the electrical connection between the first connection portion 511 and the optical transmission component 1 and the electrical connection between the second connection portion 512 and the optical reception component 2 may be made through a single pad, so that the manufacturing process is simpler, the structural stability is improved, and the performance of the optical device 10 is not affected; it will be understood that the pad structure is not shown here. After the first dc circuit on the first connection portion 511 is electrically connected to the light transmitting assembly 1 and the second dc circuit on the second connection portion 512 is electrically connected to the light receiving assembly 2, the dc power supply or the monitoring signal of the light transmitting assembly 1 and the light receiving assembly 2 can be converged on the third flexible board 5. With reference to fig. 2 and fig. 3, the first board-to-board connector 7 is disposed on the extension portion 52, in practical use, the optical device 10 needs to be connected to a printed circuit board interface of the optical module, and the dc power supply or monitoring signals of the optical transmitting assembly 1 and the optical receiving assembly 2 converged on the third flexible board 5 can be transmitted to the printed circuit board interface of the optical module through the first board-to-board connector 7, so as to solve the problems of complex control circuit and more monitoring signal requirements. On the third flexible board 5 shown in fig. 3, the extension portion 52 is disposed corresponding to the first connection portion 511, of course, the extension portion 52 may also be disposed corresponding to the second connection portion 512, and the specific disposition mode needs to be determined according to the printed circuit board interface of the optical module to be docked. Therefore, the third flexible board 5 in the present application has the characteristics of flexibility and bending, and the optical device 10 with more complex and smaller package can be completed by adopting a simple and conventional process design, and the optical device 10 combines the optical sending component 1 and the optical receiving component 2 into a receiving and sending integrated optical device, which can meet the design of an optical module with more channels and larger accommodation; certainly, the process is simple, so that the research and development cost of the optical module can be reduced.

The connection process of the optical transmission module 1, the optical reception module 2 and the third flexible board 5 in the optical device 10 in the present application will be described in detail with reference to the structure of the third flexible board 5 shown in fig. 3. First, as shown in fig. 4, the light transmitting module 1 and the light receiving module 2 are arranged side by side, and the first flexible board 3 is connected to the light transmitting module 1, so that the first rf circuit on the first flexible board 3 is electrically connected to the light transmitting module 1; connecting a second flexible board 4 on the light receiving component 2, so that a second radio frequency circuit on the second flexible board 4 is electrically connected with the light receiving component 2; then, turning the structure shown in fig. 4 left and right to obtain the structure shown in fig. 5; next, as shown in fig. 6, the third flexible board 5 shown in fig. 3 is welded to the structure shown in fig. 5, specifically, the first direct current circuit on the first connection portion 511 of the third flexible board 5 is electrically connected to the light transmitting assembly 1, the second direct current circuit on the second connection portion 512 is electrically connected to the light receiving assembly 2, the first flexible board 3 in fig. 6 is shielded by the extension portion 52 of the third flexible board 5, which is not shown, and the structure of the first flexible board 3, the second flexible board 4 and the third flexible board 5 can be seen by referring to the structure shown in fig. 7 obtained by turning fig. 6 left and right; with the structure shown in fig. 8 as a reference, the second connection portion 512 of the third flexible board 5 is folded with respect to the first connection portion 511 along the direction indicated by the rotation arrow in fig. 8, so that the final state of the third flexible board 5 is as shown in fig. 2, the light receiving assembly 2 is driven to be turned over until the light receiving assembly 2 is located below the light transmitting assembly 1, and the two are stacked to obtain the structure of the optical device 10 shown in fig. 1. It is to be understood that the structure of the third flexible board 5 in fig. 2 to 8 is only illustrated in a simple manner, and the details are not shown in detail in fig. 1.

In a possible implementation manner, please refer to a front view of an optical device 10 shown in fig. 9, a first connecting protrusion 11 is disposed at a tail end of the optical transmitting assembly 1, and correspondingly, a second connecting protrusion 12 is disposed at a tail end of the optical receiving assembly 2, a thickness of the first connecting protrusion 11 is smaller than a thickness of the optical transmitting assembly 1, a thickness of the second connecting protrusion 12 is smaller than a thickness of the optical receiving assembly 2, and an accommodating space M for abutting a printed circuit board interface of an optical module is formed between the first connecting protrusion 11 and the second connecting protrusion 12, so that the optical device 10 is conveniently abutted to the printed circuit board interface of the optical module; as shown in fig. 9, the first flexible board 3 is connected to a side of the first connecting protrusion 11 facing the second connecting protrusion 12, the second flexible board 4 is connected to a side of the second connecting protrusion 12 facing the first connecting protrusion 11, and the first flexible board 3 is opposite to the second flexible board 4, so as to be conveniently butted with a printed circuit board interface of the optical module; the first connection portion 511 of the third flexible board 5 is connected to a side of the first connection protrusion 11 departing from the second connection protrusion 12, and the second connection portion 512 is connected to a side of the second connection protrusion 12 departing from the first connection protrusion 11, and finally, in the optical device 10, the first connection portion 511, the first flexible board 3, the second flexible board 4, and the second connection portion 512 are sequentially layered from top to bottom.

For the convenience of structure design, please continue to refer to fig. 9, the surface of the first connecting protrusion 11 facing away from the second connecting protrusion 12 is lower than the surface of the light sending assembly 1 facing away from the light receiving assembly 2, so that the first connecting portion 511 connected to the surface of the first connecting protrusion 11 facing away from the second connecting protrusion 12 does not protrude from the surface of the light sending assembly 1 facing away from the light receiving assembly 2; correspondingly, the surface of the second connection bump 12 facing away from the first connection bump 11 is lower than the surface of the light receiving component 2 facing away from the light sending component 1, so that the second connection portion 512 connected to the surface of the second connection bump 12 facing away from the first connection bump 11 does not protrude from the surface of the light receiving component 2 facing away from the light sending component 1, and as shown in the schematic cross-sectional structure diagram ofbase:Sub>A-base:Sub>A in fig. 9 shown in fig. 10, the thickness of the optical device 10 after the third flexible board 5 is connected to the light sending component 1 and the light receiving component 2 is not increased, which facilitates the realization of the package miniaturization of the optical device 10.

Based on the structure of the optical device 10, the present application further provides an optical module 100, where, as shown in fig. 11, the optical module 100 includes a printed circuit board interface 20 and any one of the optical devices 10, and in order to interface with the optical device 10, the printed circuit board interface 20 here includes a first printed circuit board 8 and a second printed circuit board 9 that are stacked, where the first printed circuit board 8 is used for interfacing with the third flexible board 5, and the second printed circuit board 9 is used for interfacing with the first flexible board 3 and the second flexible board 4. Specifically, referring to the left side view of the printed circuit board interface 20 shown in fig. 12, corresponding to the first board-to-board connector 7 in the optical device 10, a second board-to-board connector 81 is formed on the first printed circuit board 8, and when the printed circuit board interface 20 is mated with the optical device 10, the second board-to-board connector 81 is electrically connected to the first board-to-board connector 7; the second printed circuit board 9 has a first connection surface a and a second connection surface b, wherein the first connection surface a is formed with a first connection circuit, and the first connection surface a is used for butting the first flexible board 3 so as to electrically connect the first connection circuit with the first radio frequency circuit; a second connection circuit is formed on the second connection surface b, and the second connection surface b is used for butting the second flexible board 4 so as to electrically connect the second connection circuit with the second radio frequency circuit. Further, as shown in fig. 12, grounding points 91 are formed on the first connection face a and the second connection face b of the second printed circuit board 9, respectively.

It should be noted that in the structural design of the optical device 10, the tolerance thereof and the tolerance of each flexible circuit board need to be strictly controlled to adapt to the design of the engineering architecture in the optical module 100. Also, to facilitate structural heat dissipation, a thermally conductive gel may be disposed between the gap between the optical device 10 and the printed circuit board interface 20.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A light device, comprising: a light transmitting unit, a light receiving unit, a first flexible board, a second flexible board, and a third flexible board;

   the light sending component and the light receiving component are arranged in a stacked mode;

   the first flexible board is provided with a first radio frequency circuit electrically connected with the light sending assembly, and the second flexible board is provided with a second radio frequency circuit electrically connected with the light receiving assembly;

   the third flexible board comprises a first connecting part, a second connecting part and an extending part, wherein a first direct current circuit is arranged on the first connecting part, a second direct current circuit is arranged on the second connecting part, and the first connecting part is bent relative to the second connecting part so that the first direct current circuit is electrically connected with the light sending assembly and the second direct current circuit is electrically connected with the light receiving assembly;

   the extension portion is provided with a first board-to-board connector which is electrically connected with the first direct current circuit and the second direct current circuit respectively, and the first board-to-board connector is used for being electrically connected with an external circuit board.
2. The optical device according to claim 1, wherein a head end of the light-sending assembly is opposite to a head end of the light-receiving assembly, and a tail end of the light-sending assembly is opposite to a tail end of the light-receiving assembly;

   the first flexible board is connected to the tail end of the light sending assembly, and the second flexible board is connected to the tail end of the light receiving assembly.
3. The optical device according to claim 2, wherein a trailing end of the light-sending assembly is provided with a first connection projection having a thickness smaller than that of the light-sending assembly; a second connecting bulge is arranged at the tail end of the light receiving component, and the thickness of the second connecting bulge is smaller than that of the light receiving component;

   and an accommodating space for butting the printed circuit board of the optical module is formed between the first connecting bulge and the second connecting bulge.
4. The optical device according to claim 3, wherein the first flexible board is connected to a side of the first connecting projection facing the second connecting projection, and the second flexible board is connected to a side of the second connecting projection facing the first connecting projection.
5. The optical device according to claim 3, wherein the first connection portion is connected to a side of the first connection protrusion facing away from the second connection protrusion, and the second connection portion is connected to a side of the second connection protrusion facing away from the first connection protrusion.
6. The optical device according to claim 5, wherein the first connection portion does not protrude from a surface of the light-transmitting assembly facing away from the light-receiving assembly, and the second connection portion does not protrude from a surface of the light-receiving assembly facing away from the light-transmitting assembly.
7. The optical device according to any one of claims 2 to 6, wherein a head end of the optical transmission assembly is provided with a first optical port, and a head end of the optical reception assembly is provided with a second optical port;

   the first light port and the second light port are arranged side by side.
8. The optical device according to any one of claims 1 to 7, wherein the first board-to-board connector corresponds to the first connection portion.
9. A light module comprising a printed circuit board interface comprising a first printed circuit board and a second printed circuit board arranged in a stack, and the optical device of any one of claims 1-8;

   a second board-to-board connector is formed on the first printed circuit board and is electrically connected with the first board-to-board connector;

   the second printed circuit board is provided with a first connecting surface and a second connecting surface which are opposite, a first connecting circuit is formed on the first connecting surface, and a second connecting circuit is formed on the second connecting surface; the first connection face is used for butting the first flexible board so as to enable the first connection circuit to be electrically connected with the first radio frequency circuit, and the second connection face is used for butting the second flexible board so as to enable the second connection circuit to be electrically connected with the second radio frequency circuit.
10. The optical module according to claim 9, wherein a ground point is formed on each of the first connection face and the second connection face.

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