TWM633445U - Optical fiber limit device and optical module - Google Patents

Abstract

This creation is about a fiber optic limiting device and an optical module, which relates to the field of optical module technology, and is used to solve the problem that the optical fiber in the optical module is easily interfered with the optical fiber internal device or lens group to cause damage and fracture. The optical fiber limiting device provided by this creation is used to limit the path of the optical fiber in the optical module, wherein the aforementioned optical fiber limiting device includes: the connection bottom surface, which can be fixedly connected to the circuit board in the aforementioned optical module; the side limiting area, One end of the side limiting area is connected to the bottom surface of the connection, and the side limiting area is used to limit or change the path of the optical fiber in the optical module to avoid the components on the circuit board.

Description

Optical Fiber Limiting Device and Optical Module

The invention relates to the technical field of optical modules, in particular to an optical fiber limiting device and an optical module using the aforementioned optical fiber limiting device.

The optical module is composed of optoelectronic devices, functional circuits and optical interfaces, etc. The optoelectronic devices include two parts: transmitting and receiving. To put it simply, the role of the optical module is to convert the electrical signal into an optical signal at the sending end and transmit it, and the receiving end converts the received optical signal into an electrical signal. Optoelectronic devices are usually laser chips and photodetector chips, and discrete optical components can be used to transmit and process optical signals between the optical interface, such as wavelength division multiplexers and lenses, etc. Optical signals are transmitted between the device chip and the optical interface.

, the optical module in the prior art includes a cover plate and a base 05, an installation space is formed in the base 05, and a circuit board 01 is fixed in the installation space. In the structure where the optical fiber is used to transmit the optical signal in the optical module, the laser chip and the photodetector chip are usually arranged on the circuit board 01, and the optical signal is coupled into the optical fiber or into the photodetector chip through the lens group. Especially in the multi-channel optical module, a plurality of optical fibers 021, 022 are fixed on the circuit board 01 by means of optical fiber internal connectors 031, 032, so as to be coupled with the lens group, as shown in FIG. 1 .

However, as the number of channels of the optical module increases, the space in the optical module is limited, and the optoelectronic chips of each channel may need to be staggered forward and backward along the axial direction on the circuit board 01 . The optical fiber 022 coupled with the optoelectronic chip at the far end (relatively far away from the optical port 04) may straddle the near-end optical fiber of the optoelectronic chip at the near end (relatively closer to the optical port 04 than another group of optoelectronic chips) for internal connection The device 031 or the lens group interferes with the proximal optical fiber internal connection device 031 or the lens group, as shown in FIG. 1 . In view of the limited installation space, that is, the height of the installation space (that is, the distance between the base 05 and the cover plate) is limited, so the gap between the cover plate and the proximal optical fiber internal connection device 031 or lens group is extremely small, so when working When the personnel install the cover plate, the cover plate will squeeze the optical fiber above the proximal optical fiber internal connection device 031 or the lens group at the proximal end, causing damage to the optical fiber 022, and even breakage during later transportation and use, resulting in optical mode Group failure and so on.

The optical fiber limiting device and optical module of the present invention are used to solve the problem that the optical fiber in the optical module is easy to interfere with the internal connection device or lens group of the optical fiber and cause damage and fracture.

In order to achieve the above purpose, the optical fiber limiting device provided by this invention is used to limit the path of the optical fiber in the optical module. The aforementioned optical fiber limiting device includes a connecting bottom surface and a side limiting area, and the connecting bottom surface can be fixedly connected to the aforementioned optical module. On the circuit board; one end of the side limiting area is connected to the bottom surface of the connection, and the side limiting area is used to limit or change the path of the optical fiber in the aforementioned optical module to avoid devices on the aforementioned circuit board.

As a further improvement of the present invention, the aforementioned optical fiber limiting device further includes a top limiting area, and the aforementioned top limiting area is connected to the end of the aforementioned side limiting area away from the bottom surface of the aforementioned connection, so as to prevent the aforementioned optical fiber from passing through the aforementioned optical fiber limiting device of the top.

As a further improvement of the invention, the angle between the aforementioned top limiting area and the side limiting area is less than or equal to 90°.

As a further improvement of the invention, the aforementioned optical fiber limiting device is a U-shaped limiting device, a C-shaped limiting device or an inverted L-shaped limiting device formed by surrounding the aforementioned connecting bottom surface, the aforementioned top limiting area, and the aforementioned side limiting area. device.

As a further improvement of the invention, the opening of the aforementioned U-shaped limiting device, the aforementioned C-shaped limiting device or the aforementioned inverted L-shaped limiting device faces away from the components that need to be avoided on the aforementioned circuit board.

As a further improvement of the invention, the angle between the aforementioned top limiting area and the aforementioned side limiting area is larger than 90°.

As a further improvement of the invention, in the aforementioned optical module, the gap between the aforementioned top limiting area and the cover plate in the aforementioned optical module is smaller than the outer diameter of the aforementioned optical fiber.

As a further improvement of the invention, the aforementioned top limiting area and the aforementioned side limiting area are cylinders extending along the same direction.

As a further improvement of the invention, the aforementioned top limiting area and the aforementioned side limiting area are surrounded by an elastic member with a through groove, the width of the aforementioned through groove is greater than or equal to the outer diameter of the aforementioned optical fiber, and the opening of the aforementioned through groove The width is smaller than the outer diameter of the aforementioned optical fiber, and the aforementioned optical fiber is passed through the aforementioned through groove.

As a further improvement of the invention, the aforementioned connecting bottom surface is a welding surface or an adhesive-backed surface.

In order to achieve the above purpose, the invention also provides an optical module, which includes: a housing, the two ends of the housing are respectively formed with an electrical port and an optical port, and the housing includes an installation space formed by a base and a cover plate ; A circuit board, an optoelectronic chip, an optical fiber and a lens group are installed in the aforementioned installation space; one end of the aforementioned circuit board stretches out from the aforementioned electric port for electrical connection with the outside; the aforementioned optoelectronic chip is located on the aforementioned circuit board; the aforementioned optical fiber includes a plurality of The optical fiber and the connecting end and coupling end respectively arranged at the two ends of the aforementioned optical fiber, the aforementioned connecting end has an optical fiber external device, and the aforementioned optical fiber external device is arranged at the aforementioned optical port for connecting with the external optical fiber; the aforementioned lens group is docked with the aforementioned coupling end , and used for the optical coupling between the aforementioned optoelectronic chip and the aforementioned optical fiber; and the aforementioned optical fiber limiting device, the aforementioned optical fiber limiting device is arranged on the aforementioned circuit board, and the aforementioned optical fiber limiting device is used to limit or change the path of the aforementioned optical fiber, To avoid the devices on the aforementioned circuit board.

As a further improvement of the invention, there are at least two aforementioned optoelectronic chips: the first optoelectronic chip and the second optoelectronic chip, respectively corresponding to at least two groups of optical fibers: the first optical fiber and the second optical fiber, and at least two groups of lens groups: the first lens group and the second lens group; the aforementioned first optical fiber has a first coupled end, the aforementioned second optical fiber has a second coupled end, and the aforementioned first coupled end and its butted first lens group are compared to the aforementioned second coupled end and the second The lens group is far away from the aforementioned optical port; the aforementioned optical fiber limiting device is adjacent to the aforementioned second coupling end or the aforementioned second lens group, and is used to limit or change the path of the first optical fiber to avoid the aforementioned second coupling end and/or the second lens group .

The optical fiber limiting device of this invention installs the optical fiber limiting device on the circuit board of the optical module by connecting the bottom surface, and in view of the optical fiber limiting device having a side limiting area, the side limiting area is connected to the connecting bottom surface, And it is used to limit or change the path of the optical fiber in the optical module to avoid other components installed on the circuit board, such as the optical fiber internal connection device and lens group at the coupling end of other optical fiber groups, so as to prevent the optical fiber from crossing to the adjacent lens. The optical fiber at the coupling end of the group or the optical fiber is above the device and is crushed by the optical module cover, which effectively improves the reliability of the optical module.

In addition, the optical fiber limiting device in the optical module of this invention adopts the same structure as the above optical fiber limiting device, so both can solve the same technical problem and achieve the same expected effect.

In order to make the purpose, technical solution and advantages of this creation clearer, the technical solution of this creation will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the invention, rather than comprehensive embodiments. Based on the embodiments in this creation, all other implementation manners obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this creation.

In describing this creation, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", The orientation or positional relationship indicated by "top", "bottom", "inner" and "outer" are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this creation and simplifying the description, not for indication or implication The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation and therefore should not be construed as limiting the invention.

Referring to Fig. 2 to Fig. 4, the optical fiber limiting device 4 provided by the invention is used to limit or change the path of the optical fiber in the optical module. In this embodiment, the optical fiber limiting device 4 includes a connecting bottom surface 41 and a side limiting area 42, the aforementioned connecting bottom surface 41 can be fixedly connected to the circuit board 1 in the aforementioned optical module group; one end of the side limiting area 42 is connected to the The aforementioned connection bottom surface 41 is connected, and the aforementioned side limiting area 42 is used to limit or change the path of the optical fiber 2 in the aforementioned optical module to avoid the devices on the aforementioned circuit board 1 .

Compared with the prior art, the optical fiber limiting device 4 of this invention is installed on the circuit board 1 of the optical module by connecting the bottom surface 41, and in view of the fact that the optical fiber limiting device 4 has a side limiting area 42, the side limiting area 42 is connected to the connection bottom surface 41, and is used to limit or change the path of the optical fiber 2 in the optical module, so as to avoid other components arranged on the circuit board 1, such as the coupling end of other optical fiber groups Optical fiber internal connection device 3 and lens group, etc., so as to prevent the optical fiber 2 (i.e. the first optical fiber 21) from crossing to the adjacent lens group or the optical fiber internal connection device 3 of the coupling end of the adjacent optical fiber (i.e. the second optical fiber 22) (i.e. The second optical fiber internally connects to the top of the device 32) and is crushed by the cover plate of the optical module, which effectively improves the reliability of the optical module. Here, the optical fiber internal connection device 3 is, for example, a multi-core optical fiber connector or the like.

When there is only one group of optical fibers, there is one optical fiber internal connection device 3, such as the first optical fiber internal connection device 31, and the above-mentioned side limiting area 42 is used to limit the coupling end of the optical fiber 2 (that is, the first optical fiber 21) from bending. Avoid pulling the connection between the coupling end of the first optical fiber 21 and the first optical fiber internal connection device 31 due to the bending of the coupling end of the first optical fiber 21, so as to ensure the connection between the first optical fiber 21 and the first optical fiber internal connection device 31. The connection is reliable, which improves the reliability of the optical module.

When there are multiple groups of optical fibers, there are multiple optical fiber internal connection devices 3, such as the first optical fiber internal connection device 31 and the second optical fiber internal connection device 32, and the above-mentioned side limiting area 42 can not only be used to limit the optical fiber 2 (that is, the first optical fiber internal connection device 32). The coupling end of an optical fiber 21) is bent, and the path of the optical fiber 2 (i.e. the first optical fiber 21) can also be changed to avoid the first optical fiber 21 straddling the second optical fiber internal connection device 32 or the lens group and being caught by the light The pressure loss of the module cover effectively improves the reliability of the optical module.

Continuing to refer to FIG. 3 , the aforementioned optical fiber limiting device 4 further includes a top limiting area 43, and the aforementioned top limiting area 43 is connected to the end of the aforementioned side limiting area 42 away from the aforementioned connecting bottom surface 41, so as to prevent the aforementioned optical fiber 2 from crossing the aforementioned The top of the optical fiber limiting device 4 can prevent the optical fiber 2 (that is, the first optical fiber 21) from crossing the top of the aforementioned optical fiber limiting device 4 and then straddling the second optical fiber internal connection device 32 or the lens group and being covered by the optical module Board pressure loss, further improving the reliability of the optical module.

It should be noted that the connection between one end of the aforementioned side limiting area 42 and the aforementioned connecting bottom surface 41 can be understood as the connection of the bottom end of the aforementioned side limiting area 42 with the aforementioned connecting bottom surface 41, and the aforementioned top limiting area 43 is connected to the aforementioned side portion The connection of the end of the limiting area 42 away from the connecting bottom surface 41 can be understood as the connection between the top of the side limiting area 42 and the aforementioned top limiting area 43 , that is, the aforementioned top limiting area 43 and the aforementioned connecting bottom surface 41 are disposed opposite to each other.

In order to improve the limiting effect of the top limiting area 43 on the optical fiber 2 (i.e. the first optical fiber 21), that is, to better prevent the first optical fiber 21 from crossing over the top of the aforementioned optical fiber limiting device 4, the aforementioned top limiting area 43 and the aforementioned side The included angle between the two limiting regions 42 is less than or equal to 90°.

Based on the above-mentioned embodiment, the aforementioned optical fiber limiting device 4 is a U-shaped limiting device (as shown in FIG. The limiting device or the inverted L-shaped limiting device, the optical fiber limiting device 4 with the above-mentioned structure has a relatively simple structure and is easy to implement.

Wherein, the aforementioned connecting bottom surface 41 and the aforementioned top limiting area 43 in the U-shaped limiting device are in the shape of horizontal strips, and the aforementioned side limiting areas 42 are in the shape of vertical short strips. That is, the connecting bottom surface 41 and the top limiting area 43 are parallel to each other, and the side limiting area 42 vertically connects the connecting bottom surface 41 and the top limiting area 43 . Alternatively, the optical fiber limiting device 4 is a U-shaped metal clip welded to the circuit board 1 .

In some embodiments of the present invention, the opening of the aforementioned U-shaped limiting device, C-shaped limiting device or inverted L-shaped limiting device faces away from the device to be avoided on the aforementioned circuit board 1, so as to limit its path The aforementioned optical fiber 2 (ie, the first optical fiber 21) enters the U-shaped limiting device, C-shaped limiting device or inverted L-shaped limiting device from the opening, and can prevent the optical fiber 2 (ie, the first optical fiber 21) from entering the U-shaped limiting device. After the opening comes out, it rides over the second optical fiber internal connection component 32 or the lens group and is crushed by the optical module cover.

Or, the above-mentioned optical fiber limiting device 4 is a V-shaped limiting device, wherein one side of the V-shaped limiting device is connected to the circuit board 1, and the other side of the V-shaped limiting device is facing the optical fiber 2 (that is, the first optical fiber 21) Extending, the opening of the V-shaped limiting device is facing away from the device on the aforementioned circuit board 1 that needs to be avoided.

In other embodiments of the present invention, the angle between the aforementioned top limiting area and the aforementioned side limiting area is greater than 90°.

Based on the above-mentioned embodiment, in the aforementioned optical module, the gap between the aforementioned top limiting area 43 and the aforementioned cover plate is smaller than the outer diameter of the aforementioned optical fiber 2 (ie, the first optical fiber 21 ), preventing the aforementioned optical fiber 2 (ie, the first optical fiber 21 ) from 21) Go over the top of the aforementioned optical fiber limiting device 4 from the gap.

It can be understood that the gap between the top limiting area 43 and the cover plate is smaller than the outer diameter of the optical fiber 2 (ie, the first optical fiber 21 ), including the case where the top limiting area 43 is attached to the cover plate.

Based on the above embodiment, the aforementioned top limiting area 43 and the aforementioned side limiting area 42 are cylinders extending in the same direction, that is, the angle between the top limiting area 43 and the aforementioned side limiting area 42 is 180°, That is to say, the above-mentioned optical fiber limiting device 4 is a limiting column 44, and the top limiting area 43 is the upper end of the aforementioned limiting column 44. By controlling the distance between the end surface of the upper end of the limiting column 44 and the cover plate, preventing The aforementioned optical fiber 2 (ie, the first optical fiber 21 ) passes over the top of the aforementioned optical fiber limiting device 4 .

Alternatively, the aforementioned optical fiber limiting device 4 also includes a connecting column, which is fixed on the lower surface of the cover and extends toward the aforementioned circuit board 1. A connection hole is provided on the aforementioned connecting column, and the aforementioned limiting column 44 is close to the aforementioned cover. One end of the plate protrudes into the connection hole, thereby better preventing the optical fiber 2 (namely the first optical fiber 21 ) from passing over the top of the limiting post 44 .

Wherein, the positions of the aforementioned limiting post 44 and the connecting post can be interchanged, that is, the limiting post 44 can be set on the cover plate, and the connecting post can be set on the circuit board 1 .

In other embodiments, the aforementioned optical fiber limiting device 4 is a limiting plate, the aforementioned limiting plate is fixed on the aforementioned circuit board 1, and the extension direction of the aforementioned limiting plate is consistent with the propagation direction of light in the aforementioned optical module ( That is, the left and right directions in Figure 5), the aforementioned limiting plate is a strip-shaped structure.

In some embodiments of the present creation, the aforementioned top limiting area 43 and the aforementioned side limiting area 42 are surrounded to form an elastic member with a through groove, and the width of the aforementioned through groove is greater than or equal to that of the aforementioned optical fiber 2 (i.e. the first The outer diameter of the optical fiber 21), the opening width of the aforementioned through groove is smaller than the outer diameter of the aforementioned optical fiber 2 (i.e. the first optical fiber 21), and the aforementioned optical fiber 2 (i.e. the first optical fiber 21) is inserted in the aforementioned through groove, thereby more It is best to prevent the optical fiber 2 (ie, the first optical fiber 21 ) from falling out of the through groove, and then cause the limiting function of the optical fiber limiting device 4 to fail.

Wherein, the above-mentioned connecting bottom surface 41 is a welding surface or an adhesive-backed surface. When the connecting bottom surface 41 is a soldering surface, the connecting bottom surface 41 can be welded on the circuit board 1 by using SMT (Surface Mount Technology, surface mount technology), which is convenient for manufacturing and simplifies the optical module assembly process. When the connecting bottom surface 41 is an adhesive-backed surface, the connecting bottom surface 41 can be bonded to the aforementioned circuit board 1 by an adhesive layer.

Referring to Figures 2 to 5, the invention also provides an optical module, the optical module includes a housing, the two ends of the aforementioned housing are respectively formed with an electrical port 52 and an optical port 51, and the aforementioned housing includes a base 5 and a The installation space formed by the cover plate is covered; the circuit board 1, photoelectric chip, optical fiber 2 and lens group are installed in the aforementioned installation space; one end of the aforementioned circuit board 1 protrudes from the aforementioned electrical port 52 for electrical connection with the outside; the aforementioned optoelectronic The chip is arranged on the aforementioned circuit board 1; the aforementioned optical fiber includes a plurality of optical fibers and connection ends and coupling ends respectively arranged at the two ends of the aforementioned optical fiber. For connection with external optical fibers; the aforementioned lens group is docked with the aforementioned coupling end, and is used for optical coupling between the aforementioned optoelectronic chip and the aforementioned optical fiber; and the aforementioned optical fiber limiting device, the aforementioned optical fiber limiting device 4 is arranged on the aforementioned circuit board 1 , the aforementioned optical fiber limiting device 4 is used to limit or change the path of the aforementioned optical fiber 2 to avoid the components on the aforementioned circuit board 1 .

Since the optical fiber limiting device 4 in the optical module provided by this invention adopts the same structure as the aforementioned optical fiber limiting device 4, the two can solve the same technical problem and achieve the same expected effect.

It should be understood that the cover plate is detachably fixed on the aforementioned base 5, so it is convenient to carry out maintenance operations on the inside of the optical module, and installation operations of components such as the circuit board 1, the photoelectric chip, the optical fiber 2, and the lens group.

Wherein, the cover plate and the base 5 are fastened and connected by screws, or the cover plate and the base 5 are clamped and connected by hooks.

Hereinafter, for the convenience of description, the optical fiber limiting device 4 in the present invention will be described in detail in conjunction with at least two groups of optical fibers 2 including the first optical fiber 21 and the second optical fiber 22 .

In some embodiments of the present invention, there are at least two aforementioned photoelectric chips: the first photoelectric chip and the second photoelectric chip, corresponding to at least two groups of optical fibers 2: the first optical fiber 21 and the second optical fiber 22, and at least two groups of lens groups : the first lens group and the second lens group; the aforementioned first optical fiber 21 has a first coupled end, the aforementioned second optical fiber 22 has a second coupled end, and the aforementioned first coupled end and its butted first lens group are compared to the aforementioned The second coupling end and the second lens group are far away from the aforementioned optical port 51; the aforementioned optical fiber limiting device 4 is adjacent to the aforementioned second coupling end or the aforementioned second lens group, and is used to limit or change the path of the first optical fiber 21 to avoid the aforementioned first optical fiber. The two coupling ends and/or the second lens group prevent the first optical fiber 21 from crossing over the second optical fiber internal connection device 32 of the coupling end of the second lens group or the second optical fiber 22 and are pressured by the optical module cover plate, effectively improving Improve the reliability of the optical module.

Wherein, the first coupled end of the aforementioned first optical fiber 21 is connected to the aforementioned first optical fiber inner connecting device 31 in the aforementioned optical fiber inner connecting device 3, and the second coupled end of the aforementioned second optical fiber 22 is connected to the aforementioned optical fiber inner connecting device 3. The aforementioned second optical fiber internal connection device 32 is connected.

In the optical module, the optical port 51 includes an optical port at the transmitting end and an optical port at the receiving end. The end of the circuit board 1 protruding from the electrical port 52 has a golden finger. The golden finger is used for electrical connection with an external host computer. The golden finger enters the circuit board 1, and then outputs to the first optoelectronic chip, such as a laser chip. The first optoelectronic chip converts the electrical signal into an optical signal, and outputs it to the optical port of the receiving end through the first lens group. The second optoelectronic die can be a photodetector die, or another set of laser dies.

In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in an appropriate manner.

In particular, it needs to be pointed out that for those skilled in the art, the equivalent changes to this creation made under the teaching of this creation should still be included in the scope claimed by the patent scope of this creation application.

01: Circuit board 021: Optical fiber 022: Optical fiber 031: Near-end optical fiber internal connection device 032: Optical fiber inner connection device 04: optical port 05: base 1: circuit board 2: Optical fiber 3: Optical fiber inner connection device 4: Optical fiber limit device 5: base 21: The first optical fiber 22: Second optical fiber 31: The first optical fiber internal connection device 32: The second optical fiber inner connection device 41: Connect the bottom surface 42: Side limit area 43: Top limit area 44: limit column 51: optical port 52: electrical port

FIG. 1 is a schematic diagram of a three-dimensional structure of an optical module in the prior art when no cover plate is installed. Figure 2 is a schematic diagram of the three-dimensional structure of the optical module of this invention when the cover plate is not installed. Fig. 3 is an enlarged view of A in Fig. 2 . Fig. 4 is a schematic layout diagram of the planar structure of the optical module shown in Fig. 2, to show the position of the optical fiber limiting device in the optical module when the inventive fiber limiting device is a U-shaped limiting device. Fig. 5 is a schematic layout diagram of another planar structure of the optical module of the present invention, to show the position of the optical fiber limiting device of the present invention in the optical module when it is a limiting column.

1: circuit board

2: Optical fiber

4: Optical fiber limit device

5: Base

21: The first optical fiber

22: Second optical fiber

51: optical port

52: electrical port

Claims (14)

An optical fiber limiting device, used to limit the path of the optical fiber in the optical module, wherein the aforementioned optical fiber limiting device includes: The connection bottom surface can be fixedly connected to the circuit board in the aforementioned optical module; Side limiting area, one end of the side limiting area is connected to the bottom surface of the connection, the side limiting area is used to limit or change the path of the optical fiber in the optical module to avoid the components on the circuit board. The optical fiber limiting device according to claim 1, wherein the aforementioned optical fiber limiting device further includes a top limiting area, and the aforementioned top limiting area is connected to the end of the aforementioned side limiting area away from the bottom surface of the connection to block the aforementioned optical fiber Go over the top of the aforementioned optical fiber stopper. The optical fiber limiting device according to claim 2, wherein the angle between the top limiting area and the side limiting area is less than or equal to 90°. The optical fiber limiting device as described in claim 3, wherein the optical fiber limiting device is a U-shaped limiting device or a C-shaped limiting device formed by surrounding the aforementioned connecting bottom surface, the aforementioned top limiting area, and the aforementioned side limiting area Or inverted L-shaped limit device. The optical fiber limiting device according to claim 4, wherein the opening of the U-shaped limiting device, the C-shaped limiting device or the inverted L-shaped limiting device faces away from the components on the circuit board that need to be avoided. The fiber limiting device according to claim 2, wherein the angle between the top limiting area and the side limiting area is larger than 90°. The optical fiber limiting device according to claim 6, wherein in the optical module, the gap between the top limiting area and the cover plate in the optical module is smaller than the outer diameter of the optical fiber. The optical fiber limiting device according to claim 7, wherein the top limiting area and the side limiting area are cylinders extending in the same direction. The optical fiber limiting device according to claim 2, wherein the aforementioned top limiting area and the aforementioned side limiting area are surrounded by an elastic member with a through groove, and the width of the aforementioned through groove is greater than or equal to the outer diameter of the aforementioned optical fiber , the opening width of the aforementioned through groove is smaller than the outer diameter of the aforementioned optical fiber, and the aforementioned optical fiber passes through the aforementioned through groove. The optical fiber limiting device according to any one of claims 1 to 9, wherein the connection bottom surface is a welding surface or an adhesive-backed surface. An optical module, comprising: Housing, the two ends of the aforementioned housing are respectively formed with an electrical port and an optical port, and the aforementioned housing includes an installation space formed by a base and a cover plate; Circuit boards, optoelectronic chips, optical fibers and lens groups are installed in the aforementioned installation space; One end of the aforementioned circuit board protrudes from the aforementioned electrical port for electrical connection with the outside; The aforementioned optoelectronic chip is arranged on the aforementioned circuit board; The aforementioned optical fiber includes a plurality of optical fibers and a connecting end and a coupling end respectively arranged at both ends of the aforementioned optical fiber, the aforementioned connecting end has an optical fiber external device, and the aforementioned optical fiber external device is arranged at the aforementioned optical port for connecting with an external optical fiber; The aforementioned lens group is docked with the aforementioned coupling end, and is used for optical coupling between the aforementioned optoelectronic chip and the aforementioned optical fiber; and The optical fiber limiting device as described in any one of claims 1 to 9, the aforementioned optical fiber limiting device is arranged on the aforementioned circuit board, and the aforementioned optical fiber limiting device is used to limit or change the path of the aforementioned optical fiber to avoid the aforementioned circuit board The above device. The optical module according to claim 11, wherein there are at least two photoelectric chips: the first photoelectric chip and the second photoelectric chip, which respectively correspond to at least two groups of optical fibers: the first optical fiber and the second optical fiber, and at least two groups of lens groups : the first lens group and the second lens group; the aforementioned first optical fiber has a first coupled end, the aforementioned second optical fiber has a second coupled end, and the aforementioned first coupled end and its butted first lens group are compared to the aforementioned second optical fiber The coupling end and the second lens group are far away from the aforementioned optical port; the aforementioned optical fiber limiting device is adjacent to the aforementioned second coupling end or the aforementioned second lens group, and is used to limit or change the path of the first optical fiber to avoid the aforementioned second coupling end and/or or the second lens group. An optical module, comprising: Housing, the two ends of the aforementioned housing are respectively formed with an electrical port and an optical port, and the aforementioned housing includes an installation space formed by a base and a cover plate; Circuit boards, optoelectronic chips, optical fibers and lens groups are installed in the aforementioned installation space; One end of the aforementioned circuit board protrudes from the aforementioned electrical port for electrical connection with the outside; The aforementioned optoelectronic chip is arranged on the aforementioned circuit board; The aforementioned optical fiber includes a plurality of optical fibers and a connecting end and a coupling end respectively arranged at both ends of the aforementioned optical fiber, the aforementioned connecting end has an optical fiber external device, and the aforementioned optical fiber external device is arranged at the aforementioned optical port for connecting with an external optical fiber; The aforementioned lens group is docked with the aforementioned coupling end, and is used for optical coupling between the aforementioned optoelectronic chip and the aforementioned optical fiber; and The optical fiber limiting device as described in Claim 10, the aforementioned optical fiber limiting device is arranged on the aforementioned circuit board, and the aforementioned optical fiber limiting device is used to limit or change the path of the aforementioned optical fiber to avoid devices on the aforementioned circuit board. The optical module according to claim 13, wherein there are at least two optoelectronic chips: the first optoelectronic chip and the second optoelectronic chip, respectively corresponding to at least two groups of optical fibers: the first optical fiber and the second optical fiber, and at least two groups of lens groups : the first lens group and the second lens group; the aforementioned first optical fiber has a first coupled end, the aforementioned second optical fiber has a second coupled end, and the aforementioned first coupled end and its butted first lens group are compared to the aforementioned second optical fiber The coupling end and the second lens group are far away from the aforementioned optical port; the aforementioned optical fiber limiting device is adjacent to the aforementioned second coupling end or the aforementioned second lens group, and is used to limit or change the path of the first optical fiber to avoid the aforementioned second coupling end and/or or the second lens group.

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