阅读说明：本技术 高速柔性电路板、光组件和光模块 (High-speed flexible circuit board, optical assembly and optical module ) 是由 黄愚 陈骁 于 2019-09-05 设计创作，主要内容包括：本申请涉及一种高速柔性电路板、光组件和光模块,其中一种高速柔性电路板,通过在第一信号通孔与接地通孔之间设置第一沟道,并将第一沟道的第一沟道端接触第一反焊盘,第二沟道端设置于第一接地端和第二接地端之间,以及在第二信号通孔与接地通孔之间设置第二沟道,并将第二沟道的第三沟道端接触第二反焊盘,第四沟道端设置于第一接地端和第二接地端之间,从而在利用TO封装光组件传输高速信号时,可分别通过第一沟道和第二沟道将谐振频率移动到更高的频段上,并降低谐振的地平面影响,避免谐振频率落入通信频段并对高速信号的传输造成干扰,进而可将TO封装光组件应用于高速及超高速光模块中,降低高速和超光速光模块的成本。(The application relates TO a high-speed flexible circuit board, an optical assembly and an optical module, wherein the high-speed flexible circuit board is characterized in that a first channel is arranged between a first signal through hole and a ground through hole, a first channel end of the first channel is contacted with a first anti-bonding pad, a second channel end is arranged between a first grounding end and a second grounding end, a second channel is arranged between a second signal through hole and the ground through hole, a third channel end of the second channel is contacted with a second anti-bonding pad, and a fourth channel end is arranged between the first grounding end and the second grounding end, so that when a TO packaging optical assembly is used for transmitting a high-speed signal, the resonant frequency can be respectively moved TO a higher frequency band through the first channel and the second channel, the influence of a resonant ground plane is reduced, the resonant frequency is prevented from falling into a communication frequency band and causing interference on the transmission of the high-speed signal, and the TO packaging optical assembly can be applied TO the high-speed and ultra-speed optical module, the cost of the high-speed and ultra-high-speed optical module is reduced.)

1. A high-speed flexible circuit board is characterized by comprising a flexible body; the flexible body is provided with a grounding through hole, a first signal through hole and a second signal through hole which are used for being matched with the TO packaging optical assembly; the ground via is disposed between the first signal via and the second signal via;

the first signal anti-bonding pad surrounds the first signal through hole, the second anti-bonding pad surrounds the second signal through hole, and the first channel and the second channel are arranged along the direction vertical to the connection line of the first signal through hole and the second signal through hole;

the first channel includes a first channel end and a second channel end opposite the first channel end; the second channel comprises a third channel end and a fourth channel end opposite the third channel end; the ground via includes a first ground and a second ground opposite to the first ground; the first signal through hole and the second signal through hole are arranged close to the first grounding end;

the first channel end contacts the first anti-pad, and the second channel end is disposed between the first ground terminal and the second ground terminal; the third channel end contacts the second anti-pad, and the fourth channel end is disposed between the first ground end and the second ground end.

2. The high speed flexible circuit board of claim 1, wherein the first channel comprises a first channel body and a first channel connection partially surrounding the first anti-pad; the second channel includes a second channel body and a second channel connection partially surrounding the second anti-pad;

the first channel body is connected with the first channel connecting part; the second channel body is connected to the second channel connection portion.

3. The high-speed flexible circuit board according TO claim 1 or 2, wherein the flexible body is provided with a direct current through hole for matching with the TO package optical component; the direct current through hole is arranged between the first signal through hole and the second signal through hole;

the high-speed flexible circuit board further comprises a direct current anti-pad surrounding the direct current through hole.

4. The high-speed flexible circuit board according to claim 3, wherein the number of the DC through holes is one; the direct current via is arranged opposite to the ground via;

or

The number of the direct current through holes is two, and any one direct current through hole is arranged close to the first signal through hole; another of the dc vias is disposed proximate to the second signal via.

5. A high speed flexible circuit board according to claim 1 or 2, wherein the length of the first channel is equal to the length of the second channel.

6. The high-speed flexible circuit board according to claim 1 or 2, wherein a length of the first channel is greater than or equal to 0.8 mm and less than or equal to 1.5 mm; the length of the second channel is greater than or equal to 0.8 mm and less than or equal to 1.5 mm;

the width of the first channel is greater than or equal to 0.2 mm and less than or equal to 0.45 mm; the width of the second channel is greater than or equal to 0.2 mm and less than or equal to 0.45 mm.

7. A high speed flexible circuit board according to claim 1 or 2, further comprising an electrical connection structure, a first signal line and a second signal line; the electric connection structure is arranged on the flexible body;

the first signal line is respectively connected with the first anti-bonding pad and the electric connection structure; the second signal line is respectively connected with the second anti-bonding pad and the electric connection structure.

8. An optical package comprising a TO package optical package, and a high speed flexible circuit board according TO any one of claims 1 TO 7; the high-speed flexible circuit board is connected with the TO packaging optical assembly.

9. An optical assembly comprising a PCB circuit board, and a high speed flexible circuit board according to any one of claims 1 to 7; the flexible body comprises a PCB connecting part; the high-speed flexible circuit board also comprises an electric connection structure arranged on the PCB connection part; the electric connection structure is connected with the PCB.

10. An optical module comprising a TO package optical subassembly, a PCB circuit board, and a high speed flexible circuit board as claimed in any one of claims 1 TO 7; and the high-speed flexible circuit board is respectively connected with the TO packaging optical assembly and the PCB circuit board.

Technical Field

The application relates to the technical field of optical communication, in particular to a high-speed flexible circuit board, an optical assembly and an optical module.

Background

With the development of communication technology, 5G (5th Generation Mobile Networks, fifth Generation Mobile communication technology) communication technology has emerged. In order to meet the requirements of 5G wireless forward transmission and ultra-large broadband data centers, the speed of the optical transceiver module is higher and higher. 25Gbps (gigabit per second) optical modules are widely used in 5G wireless fronthaul.

Optical modules often use TO package types such as TO packages and BOX packages. As shown in fig. 1, taking a TO-packaged semiconductor laser as an example, a TO laser is formed by combining a cap, a laser chip, a carrier, and a stem. The TO packaging method is low in cost and simple in process, and is a mainstream packaging form of a low-speed optical module. However, TO packages are currently not capable of being implemented in high-speed and ultra-high-speed optical modules.

The BOX package can be used for assembling an optical chip, an electrical chip, an optical device and the like by adopting a ceramic tube seat, thereby realizing high-speed packaging, and being applied to high-speed and ultra-high-speed optical modules to realize the transmission of 5G signals. However, the BOX package has high requirements for the packaging process, which results in low yield of the BOX package device, and further increases the cost of the optical module.

Namely, in the implementation process, the inventor finds that at least the following problems exist in the conventional technology: the prior high-speed or ultra-high-speed optical module has the problems of too complex packaging process and too high cost.

Disclosure of Invention

In view of the above, it is desirable to provide a high-speed flexible circuit board, an optical module, and an optical module that can reduce costs.

In order to achieve the above object, in one aspect, an embodiment of the present application provides a high-speed flexible circuit board, including a flexible body; the flexible body is provided with a grounding through hole, a first signal through hole and a second signal through hole which are used for being matched with the TO packaging optical assembly; the grounding through hole is arranged between the first signal through hole and the second signal through hole;

the first signal anti-bonding pad surrounds the first signal through hole, the second anti-bonding pad surrounds the second signal through hole, and the first channel and the second channel are arranged along the direction vertical to the connecting line of the first signal through hole and the second signal through hole;

the first channel includes a first channel end and a second channel end opposite the first channel end; the second channel includes a third channel end and a fourth channel end opposite the third channel end; the ground through hole comprises a first ground terminal and a second ground terminal opposite to the first ground terminal; the first signal through hole and the second signal through hole are arranged close to the first grounding end;

the first channel end contacts the first anti-pad, and the second channel end is arranged between the first grounding end and the second grounding end; the third channel end contacts the second anti-pad, and the fourth channel end is disposed between the first ground terminal and the second ground terminal.

In one embodiment, the first channel includes a first channel body and a first channel connection partially surrounding the first anti-pad; the second channel includes a second channel body and a second channel connection partially surrounding the second anti-pad;

the first channel body is connected with the first channel connecting part; the second channel body is connected with the second channel connecting part.

In one embodiment, the flexible body is provided with a direct current through hole matched with the TO packaging optical assembly; the direct current through hole is arranged between the first signal through hole and the second signal through hole;

the high speed flexible circuit board also includes a DC antipad surrounding the DC via.

In one embodiment, the number of the direct current through holes is one; the direct current through hole is arranged opposite to the grounding through hole;

or

The number of the direct current through holes is two, and any one direct current through hole is arranged close to the first signal through hole; another dc via is disposed proximate to the second signal via.

In one embodiment, the length of the first channel is equal to the length of the second channel.

In one embodiment, the length of the first channel is greater than or equal to 0.8 mm and less than or equal to 1.5 mm; the length of the second channel is greater than or equal to 0.8 mm and less than or equal to 1.5 mm;

the width of the first channel is greater than or equal to 0.2 mm and less than or equal to 0.45 mm; the width of the second channel is greater than or equal to 0.2 millimeters and less than or equal to 0.45 millimeters.

In one embodiment, the high-speed flexible circuit board further comprises an electrical connection structure, a first signal line and a second signal line; the electric connection structure is arranged on the flexible body;

the first signal wire is respectively connected with the first anti-bonding pad and the electric connection structure; the second signal line is respectively connected with the second anti-bonding pad and the electric connection structure.

The embodiment of the application provides an optical assembly, which comprises a TO packaging optical assembly and a high-speed flexible circuit board in any one of the embodiments; the high-speed flexible circuit board is connected with the TO encapsulation optical assembly.

The embodiment of the application provides an optical assembly, which comprises a PCB circuit board and a high-speed flexible circuit board in any one of the embodiments; the flexible body comprises a PCB connecting part; the high-speed flexible circuit board also comprises an electric connection structure arranged on the PCB connection part; the electric connection structure is connected with the PCB.

The embodiment of the application provides an optical module which is characterized by comprising a TO packaging optical assembly, a PCB circuit board and a high-speed flexible circuit board in any one embodiment; the high-speed flexible circuit board is respectively connected with the TO encapsulation optical assembly and the PCB circuit board.

One of the above technical solutions has the following advantages and beneficial effects:

the first channel is arranged between the first signal through hole and the grounding through hole, the first channel end of the first channel is contacted with the first anti-pad, the second channel end is arranged between the first grounding end and the second grounding end, the second channel is arranged between the second signal through hole and the grounding through hole, the third channel end of the second channel is contacted with the second anti-pad, and the fourth channel end is arranged between the first grounding end and the second grounding end, so that when the TO packaging optical component is used for transmitting high-speed signals, the resonant frequency can be moved TO a higher frequency band through the first channel and the second channel respectively, the influence of a resonant ground plane is reduced, the resonant frequency is prevented from falling into a communication frequency band and causing interference on the transmission of the high-speed signals, the TO packaging optical component can be applied TO high-speed and ultra-high-speed optical modules, and the cost of the high-speed and ultra-high-speed optical modules is reduced.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular description of preferred embodiments of the application, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the subject matter of the present application.

FIG. 1 is a schematic diagram of a TO packaged semiconductor laser;

FIG. 2 is a schematic diagram of an optical module of the TO package;

FIG. 3 is a schematic diagram of the connection between the TO packaged optical module and the FPC;

FIG. 4 is a schematic diagram of a first configuration of a high speed flexible circuit board in one embodiment;

fig. 5 is a second schematic diagram of the high-speed flexible circuit board according to an embodiment.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are shown in the drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element and be integral therewith, or intervening elements may also be present. As used herein, the terms "first end", "second end", "first channel end", "second channel end", "third channel end", "fourth channel end" and the like are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

At present, an optical module of a TO package can refer TO fig. 2, which takes a TOSA (Transmitter optical subassembly) of the TO package as an example. As shown in fig. 2, an external Circuit such as a driving Circuit is disposed on the PCB, a high-speed link between the laser chip inside the TOSA and the external Circuit disposed on the PCB is too long and has a complicated path, and the trace of the whole high-speed link is disposed in the PCB, a Flexible Printed Circuit (FPC) board, and a TOSA pin. In the process of signal transmission, high-speed and ultra-high-speed signals can cause serious signal reflection and loss at an interface between an optical module of a TO package and an FPC, so that signal transmission cannot be reliably realized and communication cannot be completed. Therefore, even though the TO package has the advantages of simple manufacturing process and extremely low cost, the TO package can only be applied TO low-speed optical modules with the speed of 10Gbps or less.

Further, the TO packaged optical module and the FPC may be connected as shown in fig. 3, the PIN of the TO packaged optical module needs TO be inserted into a through hole pre-designed in the FPC, a circle of bonding pads is arranged around the through hole of the FPC, the PIN and the bonding pads are connected by soldering tin through a soldering process, and finally, the PIN with an excess length is cut off, so as TO connect the FPC and the TO packaged optical module.

Because the transmission modes of the high-speed lines on the TO packaged optical module and the FPC are completely different, even if the design of the high-speed lines or the high-speed lines meets the standard impedance requirement, the conversion of the transmission modes at the interface often brings about the resonance problem with destructive influence, thereby causing the deterioration of the transmission of the ultra-high-speed signals, and ensuring that the TO packaged optical module cannot be applied TO the high-speed and ultra-high-speed optical modules.

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that the references to "first channel end", "second channel end", "third channel end", "fourth channel end", "first signal end", "second signal end", "third signal end" and "fourth signal end" in this application are only used to distinguish between each channel end and each signal end, and do not necessarily mean that the channel comprises the least number of channel ends, or that the signal via comprises the least number of signal ends, for example, the second channel may comprise only two channel ends, respectively the third channel end and the fourth channel end, or the second channel may comprise three channel ends.

In one embodiment, as shown in fig. 4, there is provided a high speed flexible circuit board including a flexible body 110; the flexible body 110 is provided with a ground through hole 210, a first signal through hole 220 and a second signal through hole 230 which are used for being matched with the TO packaging optical component; the ground via 210 is disposed between the first signal via 220 and the second signal via 230;

further comprises a first signal anti-pad surrounding the first signal via 220, a second anti-pad 130 surrounding the second signal via 230, and a first channel 140 and a second channel 150 arranged in a direction perpendicular to a connection line of the first signal via 220 and the second signal via 230;

the first channel 140 includes a first channel end and a second channel end opposite the first channel end; the second channel 150 includes a third channel end and a fourth channel end opposite the third channel end; the ground via 210 includes a first ground terminal and a second ground terminal opposite to the first ground terminal; the first signal via 220 and the second signal via 230 are disposed close to the first ground terminal;

the first channel end contacts the first anti-pad 120, and the second channel end is disposed between the first ground terminal and the second ground terminal; the third channel end contacts the second anti-pad 130, and the fourth channel end is disposed between the first ground terminal and the second ground terminal.

Specifically, referring TO fig. 4, fig. 4 shows a structure of a high-speed flexible circuit board for connecting a 4PIN TO package optical component, and further, fig. 4 shows a side of the high-speed flexible circuit board which is contacted when the high-speed flexible circuit board is soldered TO the TO package optical component. In one example, the flexible body 110 may include a substrate and a metal layer disposed against the substrate and forming a reference ground plane. It should be noted that, a person skilled in the art can determine the specific structure of the flexible body 110 according to practical situations and design requirements, and the specific structure of the flexible body 110 is not limited to the situations described in the present specification.

The flexible body 110 is used TO connect TO a TO package Optical assembly, wherein the TO package Optical assembly may be a TOSA (transmitter Optical Subassembly), a ROSA (Receiver Optical Subassembly), or a BOSA (Bi-Directional Optical Subassembly), that is, the flexible body 110 may be used TO connect TO a TOSA, a ROSA, or a BOSA. The flexible body 110 is provided with a ground through hole 210, a first signal through hole 220 and a second signal through hole 230 which are matched with the TO package optical assembly, and the PIN of the TO package optical assembly is inserted into the corresponding through hole of the flexible body 110 and connected with the flexible body 110, so that high-speed differential signal transmission between the high-speed flexible circuit board and the TO package optical assembly can be realized.

The high-speed flexible circuit board further comprises a first signal anti-pad and a second signal anti-pad, wherein the first signal anti-pad is arranged around the first signal through hole 220, the second signal anti-pad is arranged around the second signal through hole 230, and further, the first signal anti-pad completely surrounds the first signal through hole 220, namely, no metal substance exists between the first signal anti-pad and the first signal through hole 220; the second signal antipad completely surrounds the second signal via 230, i.e., there is no metallic substance between the second signal antipad and the second signal via 230.

Taking the direction of the line connecting the center of the first signal via 220 and the center of the second signal via 230 as the first direction, the second direction is perpendicular to the first direction, the high-speed flexible circuit board further includes a first channel 140 disposed along the second direction, and a second channel 150 disposed along the second direction. The first channel 140 includes a first channel end and a second channel end, the first channel end is opposite to the second channel end, and the first channel end and the second channel end may be two ends of the first channel 140 along the length direction; the second channel 150 includes a third channel end and a fourth channel end, the third channel end and the fourth channel end are opposite, and the third channel end and the fourth channel end may be both ends of the second channel 150 in the length direction.

The ground via 210 is disposed between the first signal via 220 and the second signal via 230, and the ground via 210 includes a first ground terminal and a second ground terminal, wherein the first ground terminal and the second ground terminal are opposite. The first ground terminal and the second ground terminal are the end points of the ground via 210 farthest from the connection line on both sides of the connection line between the center of the first signal via 220 and the center of the second signal via 230, respectively. The first signal via 220 and the second signal via 230 are disposed close to the first ground, that is, the arrangement order of the vias in the first direction is: a first signal via 220, a ground via 210, and a second signal via 230.

The first channel end contacts the first anti-pad 120, and the second channel end is disposed between the first ground terminal and the second ground terminal. Further, the first signal via 220 includes a first signal end and a second signal end, the first signal end is opposite to the second signal end, and the first signal end and the second signal end are respectively end points of the first signal via 220 that are farthest from a connection line on two sides of a connection line between the center of the first signal via 220 and the center of the second signal via 230. The first channel end is disposed between the first signal end and the second signal end.

The third channel end contacts the second anti-pad 130, and the fourth channel end is disposed between the first ground terminal and the second ground terminal. Further, the second signal via 230 includes a third signal end and a fourth signal end, the third signal end is opposite to the fourth signal end, and the third signal end and the fourth signal end are respectively end points of the second signal via 230 that are farthest from a connection line on two sides of a connection line between the center of the first signal via 220 and the center of the second signal via 230. The third channel terminal is disposed between the third signal terminal and the fourth signal terminal.

In one example, a high speed flexible circuit board may be as shown in fig. 5 (a). In another example, a high speed flexible circuit board may be as shown in fig. 5 (b). The second channel end and the fourth channel end may not contact the ground via 210.

This application can be when utilizing TO encapsulation optical assembly TO transmit high-speed signal, can remove resonant frequency TO higher frequency channel through first channel 140 and second channel 150 respectively, and reduce the influence of the ground plane of resonance, avoid resonant frequency TO fall into the communication frequency channel and cause the interference TO the transmission of high-speed signal, and then can be applied TO encapsulation optical assembly in the high quality signal transmission of 25Gbps and higher rate, and can effectively realize the high-speed transmission up TO 50Gbps, reduce the cost of high-speed and super light speed optical module.

In one embodiment, the first channel 140 includes a first channel body and a first channel connection partially surrounding the first anti-pad 120; the second channel 150 includes a second channel body and a second channel connection partially surrounding the second anti-pad 130;

the first channel body is connected with the first channel connecting part; the second channel body is connected with the second channel connecting part.

Specifically, the first channel body connects the first channel connection portion, which contacts the first anti-pad 120 and partially surrounds the first anti-pad 120. The second channel body is connected to a second channel connection part, which contacts the second anti-pad 130 and partially surrounds the second anti-pad 130.

Further, the first channel connection portion may be opened to the reference ground plane, that is, the metal opening window of the first anti-pad 120 and the metal opening window of the first channel connection portion may be connected together, the two metal opening windows are opened, and no metal substance is present between the two metal opening windows. Similarly, the second channel connection portion may open the reference ground plane, i.e., the metal open window of the second anti-pad 130 and the metal open window of the second channel connection portion may be connected together.

The length and width of the first trench 140 and the length and width of the second trench 150 may be determined according TO the signal transmission rate, the TO package optical module socket, the FPC material, the thickness of the metal layer, and/or the size of each through hole.

In one embodiment, the flexible body 110 has a dc via 260 formed thereon for matching with the TO package optical assembly; the dc via 260 is disposed between the first signal via 220 and the second signal via 230;

the high speed flexible circuit board also includes a dc antipad 160 surrounding the dc via 260.

Specifically, the flexible body 110 is further provided with a dc via 260 for matching with the TO package optical assembly, and the dc via 260 can be used TO connect a dc signal pin of the TO package optical assembly, such as a VCC pin and a VPD pin in the TOSA. The dc via 260 is disposed between the first signal via 220 and the second signal via 230, and the dc anti-pad 160 is disposed around the dc via 260. Further, the dc anti-pad 160 completely surrounds the dc via 260, i.e. there is no metallic substance between the dc anti-pad 160 and the dc via 260.

In one embodiment, the number of dc vias 260 is one; the dc via 260 is disposed opposite the ground via 210;

or

The number of the dc vias 260 is two, and any one of the dc vias 260 is disposed close to the first signal via 220; another dc via 260 is disposed proximate to the second signal via 230.

Specifically, when the number of the direct current vias 260 is one, that is, the high-speed flexible circuit board is used TO connect a 4PIN TO package optical component, the ground via 210 is disposed between the first signal via 220 and the second signal via 230, the direct current via 260 is disposed between the first signal via 220 and the second signal via 230, the ground via 210 and the direct current via 260 are respectively located at two sides of a connecting line between a center of the first signal via 220 and a center of the second signal via 230, and the ground via 210 is disposed opposite TO the direct current via 260, so that the flexible body 110 can be used TO be connected TO the TO package optical component in a matching manner.

When the high-speed flexible circuit board is used for connecting a 5PIN TO encapsulation optical assembly, that is, the number of the direct current through holes 260 is two, and the direct current through holes are respectively a first direct current through hole and a second direct current through hole, the number of the direct current anti-bonding pads 160 can also be two, and the direct current anti-bonding pads are respectively a first direct current anti-bonding pad and a second direct current anti-bonding pad, the first direct current anti-bonding pad surrounds the first direct current through hole, and the second direct current anti-bonding pad surrounds the second direct current through hole.

The ground via 210, the first direct current through hole and the second direct current through hole three all set up between first signal through hole 220 and second signal through hole 230, and ground via 210 and first direct current through hole are located the center of first signal through hole 220 and the both sides of the center line of second signal through hole 230 respectively, the second direct current through hole all is located the same one side of the center line of first signal through hole 220 and second signal through hole 230 with first direct current through hole two, promptly on the first direction, the order of arranging of first direct current through hole one side through-hole does in proper order: a first signal via 220, a first direct current via, a second direct current via, and a second signal via 230.

It should be noted that the number of the dc vias 260 may be determined according TO the number of pins of the TO package optical assembly, and the setting position of the dc vias 260 may be determined according TO the pin arrangement and the pin definition of the TO package optical assembly, and those skilled in the art may set the ground vias 210, the dc vias 260, and the signal vias on the flexible body 110, which are matched with the TO package optical assembly, according TO the actual situation and the design requirement, so as TO implement the connection between the high-speed flexible circuit board and the TO package optical assembly.

In one embodiment, the length of the first channel 140 is equal to the length of the second channel 150.

Specifically, the length of the first channel 140 is the sum of the length of the first channel body and the length of the first channel connection; the length of the second channel 150 is the sum of the length of the second channel body and the length of the second channel connection. The length of the first channel 140 and the length of the second channel 150 should be the same.

In one embodiment, the length of the first channel 140 is greater than or equal to 0.8 millimeters and less than or equal to 1.5 millimeters; the length of the second channel 150 is greater than or equal to 0.8 mm and less than or equal to 1.5 mm;

the width of the first channel 140 is greater than or equal to 0.2 mm and less than or equal to 0.45 mm; the width of the second channel 150 is greater than or equal to 0.2 mm and less than or equal to 0.45 mm.

Specifically, the length of the channel is between 0.8 mm and 1.5 mm, i.e., the length of the first channel 140 should be greater than or equal to 0.8 mm and less than or equal to 1.5 mm, and the length of the second channel 150 should be greater than or equal to 0.8 mm and less than or equal to 1.5 mm. The length of the first channel 140 may be any value between 0.8 mm and 1.5 mm, and the length of the second channel 150 may be any value between 0.8 mm and 1.5 mm. Further, the first channel 140 and the second channel 150 may be of equal length.

In one example, the channel length can be 0.8 millimeters, 0.85 millimeters, 0.9 millimeters, 0.95 millimeters, 1.0 millimeters, 1.05 millimeters, 1.1 millimeters, 1.15 millimeters, 1.2 millimeters, 1.28 millimeters, 1.3 millimeters, 1.38 millimeters, 1.4 millimeters, 1.45 millimeters, or 1.5 millimeters.

The width of the channel is between 0.2 mm and 0.45 mm, i.e. the width of the first channel 140 should be greater than or equal to 0.2 mm and less than or equal to 0.45 mm, and the width of the second channel 150 should be greater than or equal to 0.2 mm and less than or equal to 0.45 mm. The width of the first channel 140 may be any value between 0.2 mm and 0.45 mm, and the width of the second channel 150 may be any value between 0.2 mm and 0.45 mm. Further, the first channel 140 and the second channel 150 may be the same width or different widths.

In one example, the channel width may be 0.2 millimeters, 0.22 millimeters, 0.24 millimeters, 0.26 millimeters, 0.28 millimeters, 0.3 millimeters, 0.32 millimeters, 0.34 millimeters, 0.36 millimeters, 0.38 millimeters, 0.4 millimeters, 0.41 millimeters, 0.42 millimeters, 0.43 millimeters, 0.44 millimeters, or 0.45 millimeters.

In one embodiment, the high speed flexible circuit board further comprises an electrical connection structure, a first signal line and a second signal line; the electrical connection structure is arranged on the flexible body 110;

the first signal line is connected to the first anti-pad 120 and the electrical connection structure, respectively; the second signal lines are connected to the second anti-pad 130 and the electrical connection structure, respectively.

In particular, the flexible body 110 may include an optical component connection part and a PCB connection part sequentially arranged in the second direction. The electric connection structure is arranged on the PCB connection part and used for connecting the PCB circuit board, wherein the PCB circuit board can be provided with an external circuit matched with the optical component, such as a driving circuit and the like. The ground via 210, the first signal via 220, the second signal via 230, and the dc via 260 are all disposed at the optical module connecting portion.

One end of the first signal line is connected to the first anti-pad 120, and the other end is connected to the electrical connection structure; one end of the second signal line is connected to the second anti-pad 130, and the other end is connected to the electrical connection structure. Therefore, signal transmission between the PCB and the optical assembly can be realized through the high-speed flexible circuit board.

In one example, the high-speed flexible circuit board may further include a third signal line having one end connected to the dc anti-pad 160 and the other end connected to the electrical connection structure. Further, when the number of the dc vias 260 is two, the high-speed flexible circuit board may further include a fourth signal line, wherein one end of the third signal line is connected to the first dc anti-pad, and the other end is connected to the electrical connection structure; one end of the fourth signal wire is connected with the second direct current anti-bonding pad, and the other end of the fourth signal wire is connected with the electric connection structure.

Further, the flexible body 110 may further include an extension portion disposed between the optical assembly connection portion and the PCB connection portion, so that the applicability of the high-speed flexible circuit board may be improved. The length of the extension portion can be determined according to actual conditions and design requirements.

In one embodiment, an optical package is provided, comprising a TO package optical package, and a high speed flexible circuit board of any of the above embodiments; the high-speed flexible circuit board is connected with the TO encapsulation optical assembly.

In particular, the TO package optical assemblies may be various types, various TO packages, and various pin count optical assemblies. For example, the TO package optical subassembly may be a TOSA, ROSA, or BOSA; the TO package optical assembly can comprise 4PIN PINs or 5PIN PINs; the TO package optical component can be a TO38 package, a TO56 package, a TO46 package, a TO52 package, a TO85 package, a TO65 package, or a TO28 package.

The first signal via 220 and the second signal via 230 are each connected TO a signal pin in the TO package optical package for high speed differential signaling.

In one embodiment, the TO package optical component is an optical transmit component.

Specifically, if the TO package optical assembly is a TOSA, the ground via 210 is used TO connect TO a GND pin, and the first signal via 220 and the second signal via 230 are used TO connect TO an OUT + pin and an OUT-pin, respectively, for example, the first signal via 220 may be used TO connect TO the OUT + pin in the TO package optical assembly, and the second signal via 230 may be used TO connect TO the OUT-pin in the TO package optical assembly; alternatively, the first signal via 220 may be used TO connect TO the OUT-pin in the TO package optical subassembly and the second signal via 230 may be used TO connect TO the OUT + pin in the TO package optical subassembly.

In one embodiment, the TO package optical component is an optical receiving component.

Specifically, the TO package optical assembly is ROSA, the ground via 210 is used TO connect the CASE pin, and the first signal via 220 and the second signal via 230 can be used TO connect the LD + pin and the LD-pin, respectively. For example, a first signal via 220 may be used TO connect an LD + pin in a TO package optical package, and a second signal via 230 may be used TO connect an LD-pin in a TO package optical package; alternatively, the first signal via 220 may be used TO connect an LD-pin in a TO package optical package and the second signal via 230 may be used TO connect an LD + pin in a TO package optical package.

In one embodiment, there is provided an optical assembly comprising a PCB circuit board, and a high speed flexible circuit board of any of the above embodiments; the flexible body 110 includes a PCB connection part; the high-speed flexible circuit board also comprises an electric connection structure arranged on the PCB connection part; the electric connection structure is connected with the PCB.

Specifically, the flexible body 110 includes a PCB connection part. The electric connection structure is arranged on the PCB connection part and can be connected with a PCB circuit board, wherein the PCB circuit board can be provided with an external circuit matched with the optical component, such as a driving circuit and the like. Further, the flexible body 110 further includes an optical component connecting portion and an extending portion, the optical connecting portion, the extending portion and the PCB connecting portion are sequentially disposed along the second direction, and the optical connecting portion is connected to the extending portion, and the extending portion is connected to the PCB connecting portion.

In one embodiment, there is provided an optical module comprising a TO package optical subassembly, a PCB circuit board, and a high speed flexible circuit board of any of the above embodiments; the high-speed flexible circuit board is respectively connected with the TO encapsulation optical assembly and the PCB circuit board.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.