CN216772050U

CN216772050U - Optical module

Info

Publication number: CN216772050U
Application number: CN202220407011.1U
Authority: CN
Inventors: 刘旭霞; 罗从文; 杨思更; 何鹏; 葛君; 邵乾
Original assignee: Hisense Broadband Multimedia Technology Co Ltd
Current assignee: Hisense Broadband Multimedia Technology Co Ltd
Priority date: 2022-02-25
Filing date: 2022-02-25
Publication date: 2022-06-17
Anticipated expiration: 2032-02-25

Abstract

The application discloses optical module, including fiber holder and lens subassembly. And the inner side of the optical fiber support is fixed with an optical fiber. The lens assembly covers the optical chip, the inner surface of the lens assembly is provided with a first lens facing the optical chip, the outer surface of the lens assembly is provided with a reflecting surface, and one end of the lens assembly facing the optical fiber is provided with a second lens. The optical fiber traverses the optical fiber support, and the end face is an inclined plane. The intersection point of the central axis of the first lens and the central axis of the second lens is not on the reflecting surface, so that the central axis of the incident light entering the second lens does not coincide with the central axis of the second lens. The optical fiber end face is an inclined plane, the central axis of the incident light is not coincident with the central axis of the second lens, so that the direction of the reflected light at the optical fiber end face is wholly deviated, almost all the reflected light at the optical fiber end face cannot return to the optical chip along the original path, and information crosstalk caused by the fact that the reflected light influences the optical chip is further reduced.

Description

Optical module

Technical Field

The application relates to the technical field of communication, in particular to an optical module.

Background

The optical module comprises a lens assembly and an optical fiber support, wherein the lens assembly comprises a lens, and an optical fiber is fixed in the optical fiber support. The emitted light emitted by the optical chip is coupled to the optical fiber after being converged by the lens, and then is transmitted to the optical port of the optical module through the optical fiber to be received by the external optical fiber.

Due to the certain distance between the lens and the optical fiber, when the emitted light is coupled to the optical fiber through air, part of the emitted light is reflected on the end face of the optical fiber to generate reflected light. And since the optical path is reversible, the reflected light can return to the optical chip, thereby causing information crosstalk.

SUMMERY OF THE UTILITY MODEL

The application provides an optical module, which avoids information crosstalk caused by reflected light returning to an optical chip.

A light module, comprising:

a circuit board;

the optical fiber bracket is fixed on the circuit board, and an optical fiber is fixed on the inner side of the optical fiber bracket;

the lens component is covered on the optical chip, the inner surface of the lens component is provided with a first lens facing the optical chip, the outer surface of the lens component is provided with a reflecting surface, and one end facing the optical fiber is provided with a second lens;

the optical fiber traverses the optical fiber bracket, and the end surface is an inclined surface;

the intersection point of the central axis of the first lens and the central axis of the second lens is not on the reflecting surface, so that the central axis of the incident light entering the second lens does not coincide with the central axis of the second lens.

Has the advantages that: the application provides an optical module, which comprises a circuit board, an optical fiber bracket and a lens assembly. The optical fiber support is fixed on the circuit board, and the inner side of the optical fiber support is fixed with an optical fiber. And the lens component is covered on the optical chip, the inner surface of the lens component is provided with a first lens facing the optical chip, the outer surface of the lens component is provided with a reflecting surface, and one end facing the optical fiber is provided with a second lens. The optical fiber traverses the optical fiber support, and the end face is an inclined face. The intersection point of the central axis of the first lens and the central axis of the second lens is not on the reflecting surface, so that the central axis of the incident light entering the second lens does not coincide with the central axis of the second lens. The optical fiber end face is an inclined face, so that the direction of reflected light at the optical fiber end face is wholly deviated, most of reflected light at the optical fiber end face cannot return to the optical chip along the original path, and information crosstalk caused by the reflected light on the optical chip is reduced. The central axis of the incident light is not coincident with the central axis of the second lens so that substantially all of the reflected light at the fiber end face does not return to the optical chip along the original path, thereby further reducing information crosstalk.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of an electrical connection relationship of an optical communication terminal;

fig. 2 is a schematic structural diagram of an optical network terminal;

fig. 3 is a schematic structural diagram of an optical module according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an exploded structure of an optical module according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a fiber holder and a lens assembly according to an embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of a fiber holder and lens assembly according to an embodiment of the present application;

FIG. 7 is a first angle block diagram of a lens assembly provided by an embodiment of the present application;

FIG. 8 is a second perspective view of a lens assembly provided in accordance with an embodiment of the present application;

FIG. 9 is a third angle block diagram of a lens assembly provided by an embodiment of the present application;

FIG. 10 is a first angle block diagram of a fiber support and a fiber array according to an embodiment of the present disclosure;

FIG. 11 is a second perspective view of a fiber support and a fiber array according to an embodiment of the present disclosure;

FIG. 12 is a block diagram of a fiber optic shelf provided by an embodiment of the present application;

FIG. 13 is a view showing the structure of an optical fiber having a first inclined surface at the end surface of the optical fiber according to the embodiment of the present application;

FIG. 14 is a view showing the structure of an optical fiber having a second inclined surface at the end surface of the optical fiber according to the embodiment of the present application;

FIG. 15 is a first optical diagram provided in an embodiment of the present application;

FIG. 16 is a second optical diagram provided in an embodiment of the present application;

FIG. 17 is a third optical path diagram provided in an embodiment of the present application;

FIG. 18 is a fourth optical diagram provided in an embodiment of the present application;

fig. 19 is a fifth optical path diagram provided in the embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

In the optical communication technology, light is used to carry information to be transmitted, and an optical signal carrying the information is transmitted to information processing equipment such as a computer through information transmission equipment such as an optical fiber or an optical waveguide, so that the transmission of the information is completed. Because the optical signal has the passive transmission characteristic when being transmitted through the optical fiber or the optical waveguide, the information transmission with low cost and low loss can be realized. Further, since a signal transmitted by an information transmission device such as an optical fiber or an optical waveguide is an optical signal and a signal that can be recognized and processed by an information processing device such as a computer is an electrical signal, it is necessary to perform interconversion between the electrical signal and the optical signal in order to establish an information connection between the information transmission device such as an optical fiber or an optical waveguide and the information processing device such as a computer.

The optical module realizes the function of interconversion between the optical signal and the electrical signal in the technical field of optical fiber communication. The optical module comprises an optical port and an electrical port, the optical module realizes optical communication with information transmission equipment such as optical fibers or optical waveguides and the like through the optical port, realizes electrical connection with an optical network terminal (such as an optical modem) through the electrical port, and the electrical connection is mainly used for realizing power supply, I2C signal transmission, data signal transmission, grounding and the like; the optical network terminal transmits the electric signal to the computer and other information processing equipment through a network cable or a wireless fidelity (Wi-Fi).

Fig. 1 is a diagram of optical communication system connections according to some embodiments. As shown in fig. 1, the optical communication system mainly includes a remote server 1000, a local information processing device 2000, an optical network terminal 100, an optical module 200, an optical fiber 101, and a network cable 103;

one end of the optical fiber 101 is connected to the remote server 1000, and the other end is connected to the optical network terminal 100 through the optical module 200. The optical fiber itself can support long-distance signal transmission, for example, signal transmission of several kilometers (6 kilometers to 8 kilometers), on the basis of which if a repeater is used, ultra-long-distance transmission can be theoretically achieved. Therefore, in a typical optical communication system, the distance between the remote server 1000 and the optical network terminal 100 may be several kilometers, tens of kilometers, or hundreds of kilometers.

One end of the network cable 103 is connected to the local information processing device 2000, and the other end is connected to the optical network terminal 100. The local information processing apparatus 2000 may be any one or several of the following apparatuses: router, switch, computer, cell-phone, panel computer, TV set etc..

The physical distance between the remote server 1000 and the optical network terminal 100 is greater than the physical distance between the local information processing apparatus 2000 and the optical network terminal 100. The connection between the local information processing device 2000 and the remote server 1000 is completed by the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is completed by the optical module 200 and the optical network terminal 100.

The optical module 200 includes an optical port and an electrical port. The optical port is configured to connect with the optical fiber 101, so that the optical module 200 establishes a bidirectional optical signal connection with the optical fiber 101; the electrical port is configured to be accessed into the optical network terminal 100, so that the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. The optical module 200 converts an optical signal and an electrical signal to each other, so that a connection is established between the optical fiber 101 and the optical network terminal 100. For example, an optical signal from the optical fiber 101 is converted into an electrical signal by the optical module 200 and then input to the optical network terminal 100, and an electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module 200 and input to the optical fiber 101.

The optical network terminal 100 includes a housing (housing) having a substantially rectangular parallelepiped shape, and an optical module interface 102 and a network cable interface 104 provided on the housing. The optical module interface 102 is configured to access the optical module 200, so that the optical network terminal 100 establishes a bidirectional electrical signal connection with the optical module 200; the network cable interface 104 is configured to access the network cable 103 such that the optical network terminal 100 establishes a bi-directional electrical signal connection with the network cable 103. The optical module 200 is connected to the network cable 103 via the optical network terminal 100. For example, the optical network terminal 100 transmits an electrical signal from the optical module 200 to the network cable 103, and transmits a signal from the network cable 103 to the optical module 200, so that the optical network terminal 100 can monitor the operation of the optical module 200 as an upper computer of the optical module 200. The upper computer of the Optical module 200 may include an Optical Line Terminal (OLT) in addition to the Optical network Terminal 100.

The remote server 1000 establishes a bidirectional signal transmission channel with the local information processing device 2000 through the optical fiber 101, the optical module 200, the optical network terminal 100, and the network cable 103.

Fig. 2 is a structure diagram of an optical network terminal according to some embodiments, and fig. 2 only shows the structure of the optical module 200 of the optical network terminal 100 in order to clearly show the connection relationship between the optical module 200 and the optical network terminal 100. As shown in fig. 2, the optical network terminal 100 further includes a PCB circuit board 105 disposed in the housing, a cage 106 disposed on a surface of the PCB circuit board 105, and an electrical connector disposed inside the cage 106. The electrical connector is configured to access an electrical port of the optical module 200; the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into a cage 106 of the optical network terminal 100, the cage 106 holds the optical module 200, and heat generated by the optical module 200 is conducted to the cage 106 and then diffused by a heat sink 107. After the optical module 200 is inserted into the cage 106, an electrical port of the optical module 200 is connected to an electrical connector inside the cage 106, and thus the optical module 200 establishes a bidirectional electrical signal connection with the optical network terminal 100. Further, the optical port of the optical module 200 is connected to the optical fiber 101, and the optical module 200 establishes bidirectional electrical signal connection with the optical fiber 100.

Fig. 3 is a diagram of an optical module provided according to some embodiments, and fig. 4 is an exploded structural view of an optical module according to some embodiments. As shown in fig. 3 and 4, the optical module 200 includes a housing, a circuit board 300 disposed in the housing, a lens assembly 400, a fiber holder 500, and a fiber array 600;

the shell comprises an upper shell 201 and a lower shell 202, wherein the upper shell 201 is covered on the lower shell 202 to form the shell with two

openings

204 and 205; the outer contour of the housing generally appears square.

In some embodiments, the lower housing 202 includes a bottom plate and two lower side plates disposed at both sides of the bottom plate and perpendicular to the bottom plate; the upper housing 201 includes a cover plate, and two upper side plates disposed on two sides of the cover plate and perpendicular to the cover plate, and is combined with the two side plates by two side walls to cover the upper housing 201 on the lower housing 202.

The direction of the connecting line of the two

openings

204 and 205 may be the same as the length direction of the optical module 200, or may not be the same as the length direction of the optical module 200. For example, the opening 204 is located at an end portion of the optical module 200 (left end in fig. 3), and the opening 205 is also located at an end portion of the optical module 200 (right end in fig. 3). Alternatively, the opening 204 is located at an end of the optical module 200, and the opening 205 is located at a side of the optical module 200. Wherein, the opening 204 is an electrical port, and the gold finger of the circuit board 300 extends out of the electrical port 204 and is inserted into an upper computer (such as the optical network terminal 100); the opening 205 is an optical port configured to receive the external optical fiber 101, so that the optical fiber 101 is connected to an optical transceiver inside the optical module 200.

The upper shell 201 and the lower shell 202 are combined in an assembly mode, so that devices such as the circuit board 300 and the optical transceiver can be conveniently installed in the shells, and the upper shell 201 and the lower shell 202 can form packaging protection for the devices. In addition, when the devices such as the circuit board 300 are assembled, the positioning components, the heat dissipation components and the electromagnetic shielding components of the devices are convenient to arrange, and the automatic implementation production is facilitated.

In some embodiments, the upper housing 201 and the lower housing 202 are generally made of metal materials, which is beneficial to achieve electromagnetic shielding and heat dissipation.

In some embodiments, the optical module 200 further includes an unlocking component 203 located on an outer wall of a housing thereof, and the unlocking component 203 is configured to realize a fixed connection between the optical module 200 and an upper computer or release the fixed connection between the optical module 200 and the upper computer.

Illustratively, the unlocking member 203 is located on the outer wall of the two lower side plates 2022 of the lower housing 202, and includes a snap-fit member that mates with a cage of an upper computer (e.g., the cage 106 of the optical network terminal 100). When the optical module 200 is inserted into the cage of the upper computer, the optical module 200 is fixed in the cage of the upper computer by the engaging member of the unlocking member 203; when the unlocking member 203 is pulled, the engaging member of the unlocking member 203 moves along with the unlocking member, and the connection relationship between the engaging member and the upper computer is changed, so that the engagement relationship between the optical module 200 and the upper computer is released, and the optical module 200 can be drawn out from the cage of the upper computer.

The circuit board 300 includes circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips (such as MCU, laser driver chip, amplitude limiting amplifier chip, clock data recovery CDR, power management chip, and data processing chip DSP).

The circuit board 300 connects the above devices in the optical module 200 together according to circuit design through circuit routing to implement functions of power supply, electrical signal transmission, grounding, and the like.

The circuit board 300 is generally a rigid circuit board, which can also perform a bearing function due to its relatively rigid material, for example, the rigid circuit board can stably bear a chip; the hard circuit board can also be inserted into an electric connector in the cage of the upper computer, and in some embodiments disclosed in the application, a metal pin/golden finger is formed on the surface of the tail end of one side of the hard circuit board and is used for being connected with the electric connector; these are not easily implemented with flexible circuit boards.

Flexible circuit boards are also used in some optical modules; the flexible circuit board is generally used in combination with the rigid circuit board, and for example, the rigid circuit board may be connected to the optical transceiver device to supplement the rigid circuit board.

The lens assembly 400 is disposed on the circuit board 300, and is covered above the optical chip (the optical chip mainly refers to a light emitting chip, a driving chip, a light receiving chip, a transimpedance amplifier chip, an amplitude limiting amplifier chip, and other chips related to a photoelectric conversion function) in a cover-and-buckle manner, the lens assembly 400 and the circuit board 300 form a cavity for wrapping the light emitting chip, the light receiving chip, and other optical chips, and the lens assembly 400 and the circuit board 300 together form a structure for packaging the optical chip. Light emitted by the light emitting chip is reflected by the lens assembly 400 and enters the optical fiber array 600, light from the optical fiber array 600 is reflected by the lens assembly 400 and enters the light receiving chip, and the lens assembly establishes mutual optical connection between the light emitting chip and the optical fiber array. The lens assembly not only serves to seal the optical chip, but also to establish optical connections between the optical chip and the optical fiber array.

Lens assembly 400 may be integrally formed from a polymer material using an injection molding process. Specifically, the lens assembly 400 is made of a material having a good light transmittance, such as PEI (Polyetherimide) plastic (Ultem series). Because all of the light transmitting elements in lens assembly 400 are formed from the same single sheet of polymeric material, the number of molding dies and manufacturing costs and complexity can be significantly reduced. Meanwhile, the lens assembly 400 structure provided by the embodiment of the application only needs to adjust the positions of the incident light and the optical fiber, and is simple to install and debug.

The fiber holder 500 is fixed to the circuit board 300, and the optical fibers 601 of the fiber array 600 are fixed to the inside thereof.

Optical fiber array 600 has one end optically connected to lens assembly 400 via fiber holder 500 and the other end optically connected to a fiber optic adapter. The optical fiber array is composed of a plurality of optical fibers, transmits light from the lens assembly to the optical fiber adapter to send out optical signals to the outside, transmits the light from the optical fiber adapter to the lens assembly, and receives the optical signals from the outside of the optical module. The optical fiber array and the lens component are provided with a good optical coupling structure design, multiple paths of converged light from the lens component are incident into multiple paths of optical fibers of the optical fiber array, and the optical structure of the lens component is utilized to realize optical connection with the light emitting chip; multiple paths of light from the optical fiber array are incident into the lens assembly, and optical connection with the light receiving chip is realized by the optical structure of the lens assembly. The optical fiber array and the lens assembly are in good fixing structure design, and the optical fiber array and the lens assembly can be relatively fixed, so that the lens assembly is relatively fixed with the circuit board, and the optical fiber array and the lens assembly are relatively fixed.

FIG. 5 is a schematic structural diagram of an optical fiber holder and a lens assembly according to an embodiment of the present disclosure. FIG. 6 is a cross-sectional view of a fiber holder and a lens assembly according to an embodiment of the present disclosure. FIG. 7 is a first angle block diagram of a lens assembly provided by an embodiment of the present application. Fig. 8 is a second angle structure diagram of a lens assembly provided in the embodiments of the present application. Fig. 9 is a third angle structure diagram of a lens assembly provided in an embodiment of the present application. As shown in fig. 5-9, in the embodiment of the present application, the lens assembly 400 has a first lens 401 disposed on an inner surface thereof and facing the photonic chip, a reflective surface 402 disposed on an outer surface thereof, and a second lens 403 disposed on an end facing the optical fiber. In particular, the method comprises the following steps of,

the inner surface of the lens assembly 400 is provided with a first lens 401 facing the photo chip. Specifically, a first lens 401 is disposed perpendicular to the inner surface of the lens assembly 400 above the photonic chip. The first lens 401 is a collimating lens for collimating the emitted light signal emitted from the optical chip into parallel light vertically upward.

The first lens 401 is also located vertically below the reflective surface 402. The parallel light emitted from the second lens 403 is incident into the reflecting surface 402.

And a reflective surface 402 disposed on an outer surface of the lens assembly 400. Specifically, the outer surface of the lens assembly 400 is recessed inward, and the sidewalls of the recess are reflective surfaces 402. Wherein the outer surface of the lens assembly 400 corresponds to the inner surface of the lens assembly 400.

Towards one end of the fibre a second lens 403 is provided. Specifically, the end of the lens assembly 400 facing the optical fiber includes two retention posts 404 and a central plane 405 located between the two retention posts 404. A second lens 403 is disposed on the central surface 405.

The second lens 403 is a focusing lens for focusing the incident light inputted to the second lens 403 into one spot.

Fig. 10 is a first angle structure diagram of a fiber holder and a fiber array according to an embodiment of the present disclosure. Fig. 11 is a second angle structure diagram of an optical fiber support and an optical fiber array according to an embodiment of the present application. Fig. 12 is a block diagram of a fiber optic shelf according to an embodiment of the present application. As shown in fig. 5-12, the end of the fiber holder 500 facing the lens assembly 400 is provided with a fixing hole 502 and a fiber groove 503. In particular, the method comprises the following steps of,

the securing holes 502 and the fiber grooves 503 are each formed by an inward depression of the connecting surface 501 and traverse the entire fiber holder 500. And two fixing holes 502 are located at both sides of the fiber groove 503.

And the fixing holes 502 correspond to the fixing posts 404 and are used for connecting the lens assembly 400 and the optical fiber support 500. Specifically, the front end of the lens assembly 400 is provided with two fixing posts 404, and the two fixing posts 404 correspond to the two fixing holes 502 respectively. The two fixing posts 404 are inserted into the corresponding fixing holes 502, respectively, so that the optical fiber holder 500 is connected with the lens assembly 400.

The fiber grooves 503 are used to hold the fibers of the fiber array 500. Specifically, the optical fiber is placed in the optical fiber groove 503, and glue is injected to fix the optical fiber in the optical fiber groove 503.

As shown in fig. 10-12, the fiber optic holder 500 also includes a surface opening 504.

A surface opening 504 is formed in the surface of the fiber holder 500 to expose the fiber groove 503 for facilitating the injection of glue into the fiber groove 503.

The fiber holder 500 is used to hold not only a single fiber of the fiber array 500, but also a plurality of fibers of the fiber array 500.

The above is one structural state of the fiber optic holder 500, but is not the only structural state of the fiber optic holder 500. Another configuration of the fiber optic cradle 500 is described below.

The fiber holder 500 is further provided with a limit at an end thereof away from the end of the fiber holder 500. The presence of the stopper rod allows the front end of the fiber holder 500 to be provided with a through hole. The through hole is used for inserting the optical fiber of the optical fiber array. In use, the ends of the optical fibers are inserted into the through holes and slid along the fiber grooves 503 over the through holes until the optical fibers extend out of the ends of the fiber optic holders 500.

Fig. 13 is a diagram illustrating an optical fiber structure in which an end face of an optical fiber provided in an embodiment of the present application is a first inclined surface. Fig. 14 is a diagram illustrating an optical fiber structure in which an end face of an optical fiber provided in an embodiment of the present application is a second inclined surface. Fig. 15 is a first optical path diagram provided in the embodiment of the present application. Fig. 16 is a second optical path diagram provided in the embodiment of the present application. Fig. 17 is a third optical path diagram provided in the embodiment of the present application. Fig. 18 is a fourth optical path diagram provided in the embodiment of the present application. Fig. 19 is a fifth optical path diagram provided in the embodiment of the present application. As can be seen in fig. 5-19, the optical transmission process between the lens assembly 400 and the optical fiber on the optical fiber support 500 is as follows:

firstly, divergent light emitted by a light chip is collimated by a first lens 401 to be parallel light; secondly, the parallel light is reflected by the reflecting surface 402 and then enters the second lens 403; again, the incident light entering the second lens is focused into the optical fiber 601 through the second lens 403; finally, part of the light is reflected at the end face of the fiber 601.

According to the principle of reversible optical path, part of light can return to the optical chip through the original path after being reflected by the end face of the optical fiber 601, which is easy to cause information crosstalk. In order to avoid information crosstalk, in the embodiment of the present application, the end face of the optical fiber 601 is an inclined surface.

The optical fiber end face is an inclined face, so that the direction of reflected light at the optical fiber end face is wholly deviated, most of reflected light at the optical fiber end face cannot return to the optical chip along the original path, and the influence of the reflected light on the optical chip is reduced.

Wherein, the end face of the optical fiber 601 comprises a first inclined face (as shown in FIG. 13) and a second inclined face (as shown in FIG. 14), and the inclined angles of the two inclined faces can be 4-12 degrees.

As can be seen from fig. 5 to 19, in order to avoid crosstalk of information, in the embodiment of the present application, in addition to the end face of the optical fiber 601 being set to be inclined, the central axis of the incident light entering the second lens 403 is set to be not coincident with the central axis of the second lens 403.

The central axis of the incident light entering the second lens 403 is not coincident with the central axis of the second lens 403, and the incident light entering the second lens 403 is focused by the upper half part or the lower half part of the curved surface of the second lens 403, so that the coupling efficiency of the optical fiber 601 is improved by matching with the inclination angle of the end surface of the optical fiber 601, and almost all the reflected light at the end surface of the optical fiber 601 is prevented from returning to the optical chip along the original path, thereby further reducing the influence of the reflected light on the optical chip.

In the embodiment of the present application, the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is not located on the reflection surface 402, and the central axis of the incident light entering the second lens 403 and the central axis of the second lens 403 may not coincide with each other.

The intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is on the reflecting surface 402, and the central axis of the incident light entering the second lens 403 can be made to coincide with the central axis of the second lens 403. As shown in fig. 15.

The intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is not on the reflection surface 402, and includes the following two cases: (1) the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is on the left side of the reflecting surface 402; (2) the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is on the right side of the reflecting surface 402.

As shown in fig. 17, when the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is on the left side of the reflection surface 402, the central axis of the incident light entering the second lens 403 is located below the central axis of the second lens 403.

As shown in fig. 16, when the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 is on the right side of the reflection surface 402, the central axis of the incident light entering the second lens 403 is located on the upper side of the central axis of the second lens 403.

In the embodiment of the present application, the central axis of the incident light entering the second lens 403 may not coincide with the central axis of the second lens 403 due to the positional relationship among the first lens 401, the reflective surface 401, and the second lens 403. In particular, the method comprises the following steps of,

the position of the second lens 403 is fixed, the position of the reflecting surface 402 is fixed, and the position of the first lens 401 is moved leftward; alternatively, the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 may be located on the left side of the reflecting surface 402 when the position of the second lens 403 is fixed, the position of the first lens 401 is fixed, and the position of the reflecting surface 402 is moved downward.

The position of the second lens 403 is fixed, the position of the reflecting surface 402 is fixed, and the position of the first lens 401 is moved rightward; alternatively, the intersection point of the central axis of the first lens 401 and the central axis of the second lens 403 may be positioned on the right side of the reflecting surface 402 by moving the reflecting surface 402 upward while the position of the second lens 403 is not moved, and the position of the first lens 401 is not moved.

The vertical movement of the position of the reflecting surface 402 and the horizontal movement of the position of the first lens 401 are based on the positions of the first lens 401 and the reflecting surface 402 determined on the reflecting surface 402 such that the intersection of the central axis of the first lens 401 and the central axis of the second lens 403 intersects with each other.

When the end face of the optical fiber 601 is the first inclined face and the central axis of the incident light entering the second lens 403 is located below the central axis of the second lens 403, the coupling efficiency of the optical fiber 601 is high (this is relative to the case where the end face of the optical fiber 601 is the first inclined face and the central axis of the incident light entering the second lens 403 is located above the central axis of the second lens 403); when the end surface of the optical fiber 601 is the second inclined surface and the central axis of the incident light entering the second lens 403 is located above the central axis of the second lens 403, the coupling efficiency of the optical fiber 601 is high (compared to the case where the end surface of the optical fiber 601 is the second inclined surface and the central axis of the incident light entering the second lens 403 is located above the central axis of the second lens 403).

Namely: the end face of the optical fiber 601 is a first inclined face, the position of the second lens 403 is fixed, the position of the reflecting face 402 is fixed, and the position of the first lens 401 is moved leftward; alternatively, the end face of the optical fiber 601 is a first inclined surface, the position of the second lens 403 is fixed, the position of the first lens 401 is fixed, and the position of the reflecting surface 402 is moved downward, so that the coupling efficiency of the optical fiber 601 can be improved, and almost all reflected light at the end face of the optical fiber 601 can not return to the optical chip along the original path, thereby further reducing the influence of the reflected light on the optical chip.

Or, namely: the end face of the optical fiber 601 is a second inclined plane, the position of the second lens 403 is fixed, the position of the reflecting surface 402 is fixed, and the position of the first lens 401 moves to the right; alternatively, the end face of the optical fiber 601 is a second inclined surface, the position of the second lens 403 is fixed, the position of the first lens 401 is fixed, and the position of the reflecting surface 402 is moved upward, so that the coupling efficiency of the optical fiber 601 can be improved, and almost all reflected light at the end face of the optical fiber 601 can not return to the optical chip along the original path, thereby further reducing the influence of the reflected light on the optical chip.

In order to further avoid information crosstalk, in the embodiment of the present application, in addition to setting the end surface of the optical fiber 601 to be an inclined surface and setting the central axis of the incident light entering the second lens 403 not to coincide with the central axis of the second lens 403, the end surface of the optical fiber 601 may be further away from the focal point of the second lens 403.

The end face of the optical fiber 601 is far away from the focus of the second lens 403, and the light spot focused by the second lens 403 falls on the front end of the end face of the optical fiber 601, and the light spot continues to diverge until the end face of the optical fiber 601 is reached. Since the light incident on the end face of the optical fiber 601 is emitted light, and the emitted light has a certain emission angle, part of the reflected light reflected on the end face of the optical fiber 601 cannot return to the optical chip along the original path, so that the influence of the reflected light on the optical chip is reduced, and the information crosstalk is reduced.

Wherein the distance between the end face of the optical fiber 601 and the focal point is 10-50 microns.

The application provides an optical module, which comprises a circuit board, an optical fiber bracket and a lens assembly. The optical fiber support is fixed on the circuit board, and the inner side of the optical fiber support is fixed with an optical fiber. And the lens component is covered on the optical chip, the inner surface of the lens component is provided with a first lens facing the optical chip, the outer surface of the lens component is provided with a reflecting surface, and one end facing the optical fiber is provided with a second lens. The optical fiber traverses the optical fiber support, and the end face is an inclined face. The intersection point of the central axis of the first lens and the central axis of the second lens is not on the reflecting surface, so that the central axis of the incident light entering the second lens does not coincide with the central axis of the second lens. The optical fiber end face is an inclined face, and the direction of reflected light at the optical fiber end face is wholly deviated, so that most of reflected light at the optical fiber end face cannot return to the optical chip along the original path, and the influence of the reflected light on the optical chip is reduced. The central axis of the incident light is not coincident with the central axis of the second lens, so that almost all the reflected light at the end face of the optical fiber does not return to the optical chip along the original path, thereby further reducing the influence of the reflected light on the optical chip.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solutions of the present disclosure, not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present disclosure.

Claims

1. A light module, comprising:

a circuit board;

the optical fiber traverses the optical fiber bracket, and the end face of the optical fiber is an inclined plane;

an intersection of the central axis of the first lens and the central axis of the second lens is not located on the reflection surface so that the central axis of the incident light entering the second lens does not coincide with the central axis of the second lens.

2. The optical module according to claim 1, wherein a central axis of incident light entering the second lens is located below a central axis of the second lens.

3. The optical module according to claim 1, wherein a central axis of incident light entering the second lens is located on an upper side of the central axis of the second lens.

4. The optical module of claim 1, wherein the fiber end face is distal from a focal point of the second lens.

5. The optical module of claim 4, wherein a distance between the fiber end face and the focal point is 10-50 microns.

6. The optical module of claim 1, wherein the angle of inclination of the fiber end face is 4 ° -12 °.

7. The optical module of claim 1, wherein the optical fiber bracket is internally provided with an optical fiber groove;

the optical fiber groove is used for fixing the optical fiber.