CN214795316U - Optical module - Google Patents

Abstract

The application provides an optical module, which comprises a circuit board provided with an optical chip and a lens assembly covered on the optical chip, wherein a first lens is arranged on the inner surface of the lens assembly facing the optical chip, and a reflector is arranged on the outer surface of the lens assembly; one end of the lens component is provided with a light port, and the inner surface of the lens component facing the light port is provided with a second lens; an inserting core for wrapping the optical fiber is arranged in the optical port, an inserting core stop surface is arranged at one end of the optical port facing the second lens, and the end face of the optical fiber facing the second lens is in contact with the inserting core stop surface; a gap exists between the end face of the optical fiber and the second lens, and the end face of the optical fiber is arranged to be an inclined plane relative to the opposite side face of the optical fiber. This application sets up the lock pin of parcel optic fibre in the light mouth of lens subassembly to set up the fiber end face of optic fibre into the inclined plane, assemble to optic fibre after first lens, speculum and second lens so the light beam that the optical chip produced, assemble the light beam and take place the reflection in fiber end face department, the reflected light beam can not return according to former way, thereby has reduced the influence that the reflected light was to the optical chip.

Description

Optical module

Technical Field

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

Background

With the development of new services and application modes such as cloud computing, mobile internet, video and the like, the development and progress of the optical communication technology become increasingly important. In the optical communication technology, an optical module is a tool for realizing the interconversion of optical signals and is one of key devices in optical communication equipment, and the transmission rate of the optical module is continuously increased along with the development requirement of the optical communication technology.

An existing optical module may generally include a lens assembly and an optical fiber adapter, wherein an internal optical fiber is disposed between the lens assembly and the optical fiber adapter, one end of the internal optical fiber is coupled to the lens assembly, and the other end of the internal optical fiber is coupled to the optical fiber adapter. When the light beam reflected by the lens component is transmitted to the internal optical fiber, because a gap exists between the light outlet of the lens component and the optical fiber end face of the internal optical fiber, when the light signal is transmitted to the optical fiber end face from the light outlet of the lens component, the light signal is easy to reflect when being emitted to the optical fiber end face due to the change of a medium, so that the reflected light signal returns to the lens component according to the original path, the light beam interference in the lens component is caused, and the signal transmission performance of the optical module is influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides an optical module to solve the problem that when a lens assembly is coupled and connected with an optical fiber adapter in the existing optical module, an optical signal is easy to reflect at a coupling end face, so that light beams in the lens assembly are interfered.

In a first aspect, the present application provides an optical module, comprising:

a circuit board on which an optical chip is disposed;

the lens assembly is covered on the optical chip, a first lens is arranged on the inner surface of the lens assembly facing the optical chip, a reflector is arranged on the outer surface of the lens assembly facing away from the circuit board, and the reflector is positioned right above the first lens; one end of the lens is provided with a light port, and the inner surface of the lens facing the light port is provided with a second lens; an inserting core wrapping an optical fiber is arranged in the optical port, an inserting core stop surface is arranged at one end, facing the second lens, of the optical port, and the end face, facing the second lens, of the optical fiber is in contact with the inserting core stop surface; a gap exists between the optical fiber end face and the second lens, and the optical fiber end face is arranged to be an inclined plane relative to the opposite optical fiber side face;

the light beam emitted by the optical chip is converged to the optical fiber after passing through the first lens, the reflector and the second lens.

In a second aspect, the present application provides a light module comprising:

a circuit board on which an optical chip is disposed;

the lens assembly is covered on the optical chip, a first lens is arranged on the inner surface of the lens assembly facing the optical chip, and a reflector and a reflection converging lens are arranged on the outer surface of the lens assembly back to the circuit board; one end of the reflecting and converging lens is provided with an optical port, and the reflecting and converging lens is positioned between the reflecting mirror and the optical port; an inserting core wrapping an optical fiber is arranged in the optical port, a gap exists between the end face, facing the reflection converging lens, of the optical fiber and the reflection converging lens, and optical cement is filled in the gap;

the light beam emitted by the optical chip is converged to the optical fiber after passing through the first lens, the reflector and the reflection converging lens.

The optical module comprises a circuit board and a lens assembly, wherein an optical chip is arranged on the circuit board, the lens assembly is covered on the optical chip, and a first lens is arranged on the inner surface of the lens assembly facing the optical chip; the outer surface of the circuit board, which is back to the circuit board, is provided with a reflector, and the reflector is positioned right above the first lens; one end of the lens is provided with a light port, and the inner surface of the lens facing the light port is provided with a second lens; an inserting core wrapping the optical fiber is arranged in the optical port, an inserting core stop surface is arranged at one end of the optical port facing the second lens, and the end face of the optical fiber facing the second lens is in contact with the inserting core stop surface; a gap exists between the end face of the optical fiber and the second lens, and the end face of the optical fiber is arranged to be an inclined plane relative to the opposite side face of the optical fiber. Thus, the light beam generated by the optical chip is converted into a collimated light beam through the first lens, the collimated light beam is emitted to the reflecting mirror, reflecting on the reflecting surface of the reflector to reflect the collimated light beam perpendicular to the circuit board into a collimated light beam parallel to the circuit board, transmitting the reflected collimated light beam to the second lens, converting the collimated light beam into a converged light beam through the second lens, transmitting the converged light beam to the end face of the optical fiber, because a gap exists between the second lens and the end face of the optical fiber, when the converged light beam is emitted to the end face of the optical fiber, the converged light beam is reflected at the end face of the optical fiber because the light is transmitted at interfaces of different media, and because the end face of the optical fiber is an inclined plane relative to the opposite side face of the optical fiber, the reflected light is reflected to other places according to the size of the inclination angle of the end face of the optical fiber and cannot return as before, therefore, the interference to the laser is avoided, and the accuracy of the eye pattern generated by the laser can be improved.

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 a connection relationship of an optical communication terminal;

FIG. 2 is a schematic diagram of an optical network unit;

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

fig. 4 is an exploded structural diagram of an optical module according to an embodiment of the present disclosure;

fig. 5 is an assembly schematic diagram of a circuit board, a first lens assembly and a second lens assembly in an optical module according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a first lens assembly in an optical module according to an embodiment of the present application;

fig. 7 is a schematic view of another angular structure of a first lens assembly in an optical module according to an embodiment of the present disclosure;

fig. 8 is a schematic cross-sectional structure diagram of a first lens assembly in an optical module according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a ferrule in a first lens assembly in an optical module according to an embodiment of the present disclosure;

fig. 10 is a cross-sectional view illustrating an assembly of a first lens assembly and a ferrule in an optical module according to an embodiment of the present disclosure;

fig. 11 is a schematic view of a reflection optical path of a ferrule in an optical module according to an embodiment of the present disclosure;

fig. 12 is a schematic optical path diagram of a first lens assembly in an optical module according to an embodiment of the present application;

fig. 13 is a cross-sectional view of another structure of a first lens assembly in an optical module according to an embodiment of the present disclosure;

fig. 14 is a top view of another structure of a first lens assembly in a light module according to an embodiment of the present disclosure;

fig. 15 is a partially enlarged top view of another structure of a first lens assembly in a light module according to an embodiment of the present application;

fig. 16 is a schematic optical path diagram of another structure of the first lens assembly in an optical module according to an embodiment of the present application.

Detailed Description

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

One of the core links of optical fiber communication is the interconversion of optical and electrical signals. The optical fiber communication uses optical signals carrying information to transmit in information transmission equipment such as optical fibers/optical waveguides, and the information transmission with low cost and low loss can be realized by using the passive transmission characteristic of light in the optical fibers/optical waveguides; meanwhile, the information processing device such as a computer uses an electric signal, and in order to establish 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, it is necessary to perform interconversion between the electric signal and the optical signal.

The optical module realizes the function of interconversion of optical signals and electrical signals in the technical field of optical fiber communication, and the interconversion of the optical signals and the electrical signals is the core function of the optical module. The optical module is electrically connected with an external upper computer through a golden finger on an internal circuit board of the optical module, and the main electrical connection comprises power supply, I2C signals, data signals, grounding and the like; the electrical connection mode realized by the gold finger has become the mainstream connection mode of the optical module industry, and on the basis of the mainstream connection mode, the definition of the pin on the gold finger forms various industry protocols/specifications.

Fig. 1 is a schematic diagram of connection relationship of an optical communication terminal. As shown in fig. 1, the connection of the optical communication terminal mainly includes the interconnection among the optical network terminal 100, the optical module 200, the optical fiber 101 and the network cable 103;

one end of the optical fiber 101 is connected with a far-end server, one end of the network cable 103 is connected with local information processing equipment, and the connection between the local information processing equipment and the far-end server is completed by the connection between the optical fiber 101 and the network cable 103; and the connection between the optical fiber 101 and the network cable 103 is made by the optical network terminal 100 having the optical module 200.

An optical port of the optical module 200 is externally accessed to the optical fiber 101, and establishes bidirectional optical signal connection with the optical fiber 101; an electrical port of the optical module 200 is externally connected to the optical network terminal 100, and establishes bidirectional electrical signal connection with the optical network terminal 100; the optical module realizes the interconversion of optical signals and electric signals, thereby realizing the establishment of information connection between the optical fiber and the optical network terminal; specifically, the optical signal from the optical fiber is converted into an electrical signal by the optical module and then input to the optical network terminal 100, and the electrical signal from the optical network terminal 100 is converted into an optical signal by the optical module and input to the optical fiber.

The optical network terminal is provided with an optical module interface 102, which is used for accessing an optical module 200 and establishing bidirectional electric signal connection with the optical module 200; the optical network terminal is provided with a network cable interface 104, which is used for accessing the network cable 103 and establishing bidirectional electric signal connection with the network cable 103; the optical module 200 is connected to the network cable 103 through the optical network terminal 100, specifically, the optical network terminal transmits a signal from the optical module to the network cable and transmits the signal from the network cable to the optical module, and the optical network terminal serves as an upper computer of the optical module to monitor the operation of the optical module.

At this point, a bidirectional signal transmission channel is established between the remote server and the local information processing device through the optical fiber, the optical module, the optical network terminal and the network cable.

Common information processing apparatuses include routers, switches, electronic computers, and the like; the optical network terminal is an upper computer of the optical module, provides data signals for the optical module, and receives the data signals from the optical module, and the common upper computer of the optical module also comprises an optical line terminal and the like.

Fig. 2 is a schematic diagram of an optical network terminal structure. As shown in fig. 2, the optical network terminal 100 has a circuit board 105, and a cage 106 is disposed on a surface of the circuit board 105; an electric connector is arranged in the cage 106 and used for connecting an electric port of an optical module such as a golden finger; the cage 106 is provided with a heat sink 107, and the heat sink 107 has a projection such as a fin that increases a heat radiation area.

The optical module 200 is inserted into the optical network terminal, specifically, the electrical port of the optical module is inserted into the electrical connector inside the cage 106, and the optical port of the optical module is connected to the optical fiber 101.

The cage 106 is positioned on the circuit board, and the electrical connector on the circuit board is wrapped in the cage, so that the electrical connector is arranged in the cage; the optical module is inserted into the cage, held by the cage, and the heat generated by the optical module is conducted to the cage 106 and then diffused by the heat sink 107 on the cage.

Fig. 3 is a schematic view of an optical module according to an embodiment of the present disclosure, and fig. 4 is a schematic view of an exploded structure of an optical module according to an embodiment of the present disclosure. As shown in fig. 3 and 4, an optical module 200 provided in the embodiment of the present application includes an upper housing 201, a lower housing 202, an unlocking member 203, a circuit board 300, a first lens assembly 400, a second lens assembly 500, and an optical fiber adapter.

The upper shell 201 is covered on the lower shell 202 to form a wrapping cavity with two openings; the outer contour of the wrapping cavity is generally a square body, and specifically, the lower shell comprises a main plate and two side plates which are positioned at two sides of the main plate and are perpendicular to the main plate; the upper shell comprises a third shell, and the third shell covers the two side plates of the upper shell to form a wrapping cavity; the upper shell can also comprise two side walls which are positioned on two sides of the third shell and are perpendicular to the third shell, and the two side walls are combined with the two side plates to cover the upper shell on the lower shell.

The two openings may be two ends (204, 205) in the same direction, or two openings in different directions; one opening is an electric port 204, and a gold finger of the circuit board extends out of the electric port 204 and is inserted into an upper computer such as an optical network terminal; the other opening is an optical port 205 where a fiber optic adapter inside the optical module is located for connection with an external fiber optic connector (external fiber); the circuit board 300, the first lens assembly 400, the second lens assembly 500, and the optical fiber adapter are located in the package cavity.

The assembly mode of combining the upper shell and the lower shell is adopted, so that the circuit board 300, the first lens assembly 400, the second lens assembly 500, the optical fiber adapter and other devices can be conveniently installed in the shells, and the outermost packaging protection shell of the optical module is formed by the upper shell and the lower shell; the upper shell and the lower shell are made of metal materials generally, so that electromagnetic shielding and heat dissipation are facilitated; generally, the housing of the optical module is not made into an integrated component, so that when devices such as a circuit board and the like are assembled, the positioning component, the heat dissipation component and the electromagnetic shielding component cannot be installed, and the production automation is not facilitated.

The unlocking component 203 is located on the outer wall of the wrapping cavity/lower shell 202, and is used for realizing the fixed connection between the optical module and the upper computer or releasing the fixed connection between the optical module and the upper computer.

The unlocking component 203 is provided with a clamping component matched with the upper computer cage; the end of the unlocking component can be pulled to enable the unlocking component to move relatively on the surface of the outer wall; the optical module is inserted into a cage of the upper computer, and the optical module is fixed in the cage of the upper computer by a clamping component of the unlocking component; by pulling the unlocking component, the clamping component of the unlocking component moves along with the unlocking component, so that the connection relation between the clamping component and the upper computer is changed, the clamping relation between the optical module and the upper computer is released, and the optical module can be drawn out from the cage of the upper computer.

The circuit board 300 is provided with circuit traces, electronic components (such as capacitors, resistors, triodes, and MOS transistors), and chips, such as a light emitting chip LD, a driving chip LDD, a light receiving chip PD, a transimpedance amplifier chip TIA, and a limiting amplifier chip LA, i.e., a microprocessor chip MCU, wherein the light emitting chip and the light receiving chip are directly mounted on the circuit board 300 of the optical module, and this type of chip on board package is known in the art as cob (chip on board) package.

The circuit board connects the electrical appliances in the optical module together according to the circuit design through circuit wiring to realize the functions of power supply, electrical signal transmission, grounding and the like.

The circuit board is generally a hard circuit board, and the hard circuit board can also realize a bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear a chip; when the optical transceiver is positioned on the circuit board, the rigid circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, 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.

A flexible circuit board is also used in a part of the optical module to supplement a rigid circuit board; the flexible circuit board is generally used in combination with a rigid circuit board, for example, the rigid circuit board may be connected to the optical transceiver device through the flexible circuit board.

The circuit board is generally a hard circuit board, and the hard circuit board can also realize a bearing effect due to the relatively hard material of the hard circuit board, for example, the hard circuit board can stably bear a chip; when the optical transceiver is positioned on the circuit board, the rigid circuit board can also provide stable bearing; the hard circuit board can also be inserted into an electric connector in the upper computer cage, and specifically, 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.

A flexible circuit board is also used in a part of the optical module to supplement a rigid circuit board; the flexible circuit board is generally used in combination with a rigid circuit board, for example, the rigid circuit board may be connected to the optical transceiver device through the flexible circuit board.

Fig. 5 is an assembly schematic diagram of a circuit board, a first lens assembly, and a second lens assembly in an optical module provided in the embodiment of the present application. As shown in fig. 5, the lens assemblies (the first lens assembly 400 and the second lens assembly 500) provided in the present application are disposed on the circuit board 300, and are covered above the optical chips on the circuit board 300 in a cover-and-buckle manner (the optical chips mainly refer to light emitting chips, driving chips, light receiving chips, transimpedance amplifier chips, amplitude limiting amplifier chips, and other chips related to the photoelectric conversion function), the lens assemblies and the circuit board 300 form a cavity for wrapping the optical chips such as the light emitting chips and the light receiving chips, and the lens assemblies and the circuit board 300 together form a structure for packaging the optical chips. Light emitted by the light emitting chip is reflected by the first lens assembly 400 and enters the optical fiber adapter, light from the optical fiber adapter is reflected by the second lens assembly 500 and enters the light receiving chip, and the first lens assembly 400 and the second lens assembly 500 establish mutual optical connection among the light emitting chip, the light receiving chip and the optical fiber adapter. The lens assembly not only serves to seal the optical chip, but also to establish optical connection between the optical chip and the fiber optic adapter.

The lens assembly may be integrally formed from a polymeric material using an injection molding process. Specifically, the lens component is made of a material having good light transmittance, such as PEI (Polyetherimide) plastic (Ultem series). Because all the light beam transmission elements in the lens component are formed by the same polymer material single piece, the forming die can be greatly reduced, and the manufacturing cost and complexity are reduced. Meanwhile, the lens assembly structure is based on the above structure, only the positions of the incident light beam and the optical fiber need to be adjusted, and the installation and debugging are simple.

The optical fiber adapter comprises a first optical fiber adapter and a second optical fiber adapter, wherein optical connection is established between one end of the first optical fiber adapter and the first lens assembly 400, optical connection is established between the other end of the first optical fiber adapter and an external optical fiber, and light beams emitted by the light emitting chip are transmitted to the first optical fiber adapter after being reflected by the first lens assembly 400, so that light signals are emitted outwards; an optical connection is established between one end of the second optical fiber adapter and the second lens assembly 500, an optical connection is established between the other end of the second optical fiber adapter and the external optical fiber, an optical signal from the external optical fiber is transmitted to the second lens assembly 500 through the second optical fiber adapter, and the optical signal is reflected by the second lens assembly 500 and then emitted to the light receiving chip, so that the external optical signal is received.

The first optical fiber adapter and the second optical fiber adapter are both positioned at an optical interface formed by the upper shell 201 and the lower shell 202 and are connecting pieces for connecting the optical module and external optical fibers of the optical module; in addition, in order to connect with an external optical fiber, matching structures are often required to be arranged at the optical interfaces of the upper shell 201 and the lower shell 202. Fiber optic adapters are typically of a standard shape and size to facilitate the insertion of external fiber optic connectors/plugs, and have a plurality of fiber optic interfaces therein, including interfaces for outgoing optical signals and interfaces for incoming optical signals. A common fiber optic connector/plug is an MT-type fiber optic connector (e.g., MPO (Multi-fiber Push On) fiber optic jumper connector). The optical fiber connector is inserted into the optical fiber adapter of the optical module, so that optical signals inside the optical module can be transmitted into the external optical fiber, and optical signals outside the optical module can be transmitted into the optical module.

In the embodiment of the present application, in order to realize optical connection between the lens assembly and the optical fiber adapter, an internal optical fiber is disposed between the lens assembly and the optical fiber adapter, one end of the internal optical fiber is coupled to the lens assembly, and the other end of the internal optical fiber is coupled to the optical fiber adapter. When the light beam reflected by the first lens assembly 400 is transmitted to the internal optical fiber, since a gap exists between the light outlet of the first lens assembly 400 and the optical fiber end surface of the internal optical fiber, when the light signal is transmitted to the optical fiber end surface from the light outlet of the first lens assembly 400, the light signal is easily reflected when being emitted to the optical fiber end surface due to the change of the medium, so that the reflected light signal reenters the first lens assembly 400 according to the original path, and the light beam interference is caused.

In order to solve the above problem, embodiments of the present application provide an optical module, in which a ferrule covering an optical fiber is embedded at an optical port of the first lens assembly 400, and an optical fiber end surface of the optical fiber is set to be an inclined surface, so that when a light beam reflected by the first lens assembly 400 is incident on the optical fiber end surface, reflected light is reflected to other places according to an inclined angle of the inclined surface, rather than entering the first lens assembly 400 according to an original path, thereby reducing interference of the reflected light.

Fig. 6 is a schematic structural diagram of a first lens assembly in an optical module provided in the present application, fig. 7 is another angular structural diagram of the first lens assembly in the optical module provided in the present application, and fig. 8 is a schematic cross-sectional diagram of the first lens assembly in the optical module provided in the present application. As shown in fig. 6, 7 and 8, the first lens assembly 400 includes a lens body 410, a cavity 420 is disposed on a side of the lens body 410 facing the circuit board 300, the cavity 420 is open on a side facing the circuit board 300, and the optical chip is disposed in a space formed by the cavity 420 and the circuit board 300. The lens body 410 is attached to the surface of the circuit board 300 and the optical chip on the circuit board 300 is housed in the cavity 420 of the lens body 410.

A groove 4210 is provided in the cavity 420 of the lens body 410, an inner surface of the groove 4210 is provided with a first lens 4220, and the first lens 4220 is positioned right above the optical chip on the circuit board 300 and is used for converting the light beam generated by the optical chip into a collimated light beam which is perpendicular to the circuit board 300. The outer surface of the lens body 410 facing away from the circuit board 300 is provided with a reflector 430, the reflector 430 is arranged right above the first lens 4220, the collimated light beam converted by the first lens 4220 is emitted to the reflector 430, the collimated light beam is reflected on the reflecting surface of the reflector 430, and the reflected light beam is parallel to the circuit board 300.

One end of the lens body 410 facing the fiber adapter is provided with an optical port 480, the central axis of the optical port 480 is parallel to the circuit board 300, and the light beam reflected by the reflector 430 is incident into the optical port 480. The inner surface of the lens body 410 facing the light port 480 is provided with a second lens 440, the second lens 440 is disposed between the reflector 430 and the light port 480, a central axis of the second lens 440 coincides with a central axis of the light port 480, the collimated light beam reflected by the reflector 430 is emitted to the second lens 440, and the second lens 440 converts the collimated light beam into a converging light beam and transmits the converging light beam into the light port 480.

Specifically, a through hole 450 is disposed between the light port 480 of the lens body 410 and the reflector 430, the through hole 450 communicates the reflector 430 and the light port 480, and a second lens 440 is disposed at one end of the through hole 450 close to the reflector 430, and is configured to convert the collimated light beam emitted from the reflector 430 into a converging light beam. The diameter of the through hole 450 is smaller than the diameter of the optical port 480, such that a step surface is formed at the connection of the through hole 450 and the optical port 480, and the step surface is the ferrule stop surface 460.

The lens body 410 is further provided with a dispensing slot 470, and the dispensing slot 470 is communicated with the light port 480 and used for injecting glue into the light port 480 through the dispensing slot 470. In the embodiment of the present application, two opposite dispensing grooves 470 are disposed on the lens body 410, an opening of one dispensing groove 470 faces upward, and an opening of the other dispensing groove 470 faces downward, so that the glue is applied to the upper outer surface of the ferrule 600 through the dispensing groove 470 with the upward opening, so as to bond the upper portion of the ferrule 600 with the inner side surface of the optical port 480 through the glue; glue is applied to the lower outer surface of the ferrule 600 through the glue dispensing slot 470 with the opening facing downward to bond the lower portion of the ferrule 600 to the inner side surface of the optical port 480 through the glue. According to the application, the glue is coated on the outer surface of the ferrule 600 through the two opposite glue dispensing grooves 470, the glue can be coated on the outer surface of the ferrule 600 without rotating the ferrule 600, and the connection stability of the ferrule 600 and the optical port 480 is improved.

Fig. 9 is a schematic structural diagram of a ferrule in an optical module provided in the embodiment of the present application, and fig. 10 is an assembly cross-sectional view of a circuit board, a first lens assembly, and the ferrule in the optical module provided in the embodiment of the present application. As shown in fig. 9 and 10, the ferrule 600 is inserted into the optical port 480 of the lens body 410, and the end surface of the ferrule 600 facing the second lens 440 contacts the ferrule stop surface 460, so that the second lens 440 focuses the light beam into a spot in the optical fiber 630 of the ferrule 600. After the ferrule 600 is inserted into the optical port 480 and the end surface of the ferrule contacts the ferrule stop surface 460, glue is injected into the optical port 480 through the glue dispensing groove 470, and the glue is coated on the outer surface of the ferrule 600, so that the outer surface of the ferrule 600 and the inner side surface of the optical port 480 are fixed through the glue, and the ferrule 600 is fixed in the optical port 480.

Specifically, after the ferrule 600 is inserted into the optical port 480 through the opening at one end of the optical port 480, the ferrule 600 continues to move leftward along the optical port 480 until the end surface of the ferrule 600 contacts the ferrule stop surface 460. The side 620 of the ferrule 600 facing away from the second lens 440 is perpendicular to the circuit board 300, is planar, and is in close contact with and abutting against the internal optical fiber inserted into the optical port 480, so as to connect the ferrule 600 with the internal optical fiber. In this way, the light beam emitted from the second lens 440 is converged to the optical fiber 630 in the ferrule 600, and then transmitted to the inner optical fiber through the optical fiber 630, so as to realize the emission of light.

In the embodiment of the present application, the ferrule 600 is first preset in the optical port 480 of the lens body 410, and the optical fiber end face 610 of the optical fiber 630 in the ferrule 600 is beveled to prevent the light beam reflected by the converged light beam at the optical fiber end face 610 from returning to the first lens assembly 400 along the original path; the internal fiber is then inserted into the optical port 480 and mated in physical intimate contact with the other side 620 of the ferrule 600. Thus, the end face of the internal fiber insertion port 480 need not be treated, but merely inserted into the port 480 to abut against the side face 620 of the ferrule 600.

Or the internal optical fiber can be inserted into the ferrule 600, the fiber end face of the internal optical fiber is flush with the end face of the ferrule 600, then the ferrule 600 wrapping the internal optical fiber is inserted into the optical port 480 through the opening at one end of the optical port 480, and the optical fiber is continuously moved leftwards along the optical port 480 until the end face of the ferrule 600 contacts the ferrule stop face 460; glue is then injected into the outer surface of the ferrule 600 through the glue dispensing slot 470 to secure the outer surface of the ferrule 600 with the inner side of the optical port 480 through the glue, thereby securing the internal optical fiber within the optical port 480 through the ferrule 600.

In the embodiment of the present application, the ferrule 600 is embedded in the optical port 480 of the lens body 410, the ferrule 600 is made of a ceramic material, the optical fiber 630 is fixed in the optical port 480 through the ferrule, and compared with a plastic part wrapping the optical fiber 630, the machining precision of the ferrule made of ceramic is higher, and after the ferrule 600 is fixed in the optical port 480 through glue, the ferrule 600 is not easy to move, so that the stability of the optical fiber 630 is improved, a light beam emitted by the second lens 440 is better converged into the optical fiber 630, and the light beam convergence precision is improved.

The end face of the ferrule 600 facing the ferrule stop surface 460 may be an inclined plane as the fiber end face 610 of the fiber 630, and the end face of the ferrule 600 is parallel to the fiber end face 610, so that after the fiber 630 is inserted into the ferrule 600, the end face of the ferrule 600 and the fiber end face 610 of the fiber 630 are cut into inclined planes together, which is convenient for processing; the end surface of the ferrule 600 facing the ferrule stop surface 460 may also be perpendicular to the plane of the circuit board 300, so that the end surface of the ferrule 600 contacts the ferrule stop surface 460 conveniently, and the fiber end surface 610 of the fiber 630 in the ferrule 600 is an inclined surface.

In the embodiment of the present application, the optical chip includes a light emitting chip 310 and a driving chip 320, the light emitting chip 310 and the driving chip 320 are respectively attached to the circuit board 300, the light emitting chip 310 is disposed right below the first lens 4220, the driving chip 320 is configured to drive the light emitting chip 310 to emit a light beam perpendicular to the circuit board 300, and the light beam emitted after passing through the first lens 4220 and the reflector 430 is parallel to the circuit board 300.

Fig. 11 is a schematic view of a reflection optical path of an optical fiber in an optical module according to an embodiment of the present application. As shown in fig. 11, when a light beam is incident on the fiber end face 610, due to a gap existing between the second lens 440 and the fiber end face 610, light is reflected when propagating at an interface of different media, if the fiber end face 610 is perpendicular to the plane of the circuit board 300, the reflected light returns as it is and then reaches a light emitting chip (e.g., a laser), and in a high-speed project, such as a single-channel 25G/50G/56G project, the laser is very sensitive to light interference, which may cause eye-diagram hair and bit errors generated by the laser, resulting in defects; if the fiber end face 610 is beveled, the reflected light will be reflected elsewhere depending on the angle of the bevel, rather than returning as it were, thereby reducing the effect of the reflected light on the laser.

In the embodiment of the present application, the angle between the fiber end face 610 and the opposite fiber side face 620 is 3-13 °. Preferably, the angle between the fiber end face 610 and the opposing fiber side face 620 is 8 °.

Fig. 12 is a schematic optical path diagram of a first lens assembly in an optical module according to an embodiment of the present application. As shown in fig. 12, after the ferrule 600 is fixed in the optical port 480 by glue, the optical chip generates a light beam perpendicular to the circuit board 300, the light beam is converted into a collimated light beam after passing through the first lens 4220, the collimated light beam is emitted to the reflector 430, and is reflected at the reflection surface of the reflector 430, the reflected collimated light beam is parallel to the circuit board 300, the reflected collimated light beam is converted into a converged light beam by the second lens 440, the converged light beam is transmitted to the fiber end surface 610 of the optical fiber 630 in the ferrule 600, part of the light beam is reflected at the fiber end surface 610, the reflected light beam is reflected to other places according to the inclination angle of the fiber end surface 610, most of the light beam penetrates through the fiber end surface 610 and enters the optical fiber 630, and is finally transmitted to the internal optical fiber through the contact surface between the ferrule 600 and the internal optical fiber, and light emission is realized.

In addition to the above-mentioned embodiments, the optical fiber end face 610 is set to be an inclined plane to solve the problem of reflection interference of the optical fiber end face of the optical port of the docking client, and the converging lens can be directly processed in the reflecting surface to reduce reflection caused by propagation of light from different media.

Fig. 13 is another schematic structural diagram of a first lens assembly in an optical module according to an embodiment of the present application. As shown in fig. 13, in the optical module provided in the embodiment of the present application, the first lens assembly 400 includes a lens body 410, a cavity 420 is disposed on a side of the lens body 410 facing the circuit board 300, an opening is disposed on a side of the cavity 420 facing the circuit board 300, and an optical chip on the circuit board 300 is disposed in the cavity 420; the inner surface of the lens body 410 facing the optical chip is provided with a first lens 4220, and the first lens 4220 is positioned right above the optical chip and used for converting the light beam emitted by the optical chip into a collimated light beam; the outer surface of the lens body 410 facing away from the circuit board 300 is provided with a reflector 430 and a reflective converging lens 4330, wherein the reflector 430 is used for reflecting the collimated light beam; the reflective focusing lens 4330 is disposed between the reflecting mirror 430 and the light port 480, and reflects and focuses the light beam; an optical port 480 is formed in one end, facing the optical fiber adapter, of the lens body 410, an optical ferrule 600 wrapping the optical fiber is arranged in the optical port 480, a gap exists between the end face, facing the reflection converging lens 4330, of the optical fiber and the reflection converging lens 4330, optical cement is filled in the gap, and thus a converging light beam emitted by the reflection converging lens 4330 passes through the optical cement and is emitted to the optical fiber.

Fig. 14 is a side view of a first lens assembly in an optical module provided in an embodiment of the present application, and fig. 15 is a partially enlarged side view of the first lens assembly in the optical module provided in the embodiment of the present application. As shown in fig. 14 and 15, the reflector 430 includes a first reflector 4310 and a second reflector 4320, the first reflector 4310 is disposed right above the first lens 4220, and is configured to reflect the collimated light beam emitted from the first lens 4220 into a collimated light beam parallel to the circuit board 300; the second reflector 4320 is disposed at the right side of the first reflector 4310, the reflective converging lens 4330 is disposed at the rear side of the second reflector 4320, the central axis of the reflective converging lens 4330 coincides with the central axis of the optical port 480, the second reflector 4320 is configured to reflect the reflected light beam parallel to the circuit board 300 onto the reflective converging lens 4330, and the reflective converging lens 4330 reflects and converges the re-reflected light beam to converge the optical fiber in the ferrule 600.

Fig. 16 is a schematic optical path diagram of another structure of the first lens assembly in the optical module according to the embodiment of the present application. As shown in fig. 16, the optical fiber end face 610 of the optical fiber facing the reflection converging lens 4330 is in close contact with the reflection converging lens 4330 through optical cement, that is, the optical fiber end face 610 is in hard contact with the optical cement, and there is no gap between the two, so that when the light beam emitted from the reflection converging lens 4330 passes through the optical cement and converges on the optical fiber end face 610, because there is no medium change, the light beam is not reflected at the optical fiber end face 610, and there is no interference caused by the reflected light beam returning to the first lens assembly 400.

Because the optical fiber end face 610 and the reflective converging lens 4330 are in close contact with each other through optical cement, the optical fiber end face 610 may be disposed as an inclined plane with respect to the opposite optical fiber side face 620, or may be a plane perpendicular to the circuit board 300, and may be adopted according to design requirements.

The optical module comprises a circuit board and a lens assembly, wherein an optical chip is arranged on the circuit board, and the lens assembly is covered on the optical chip; the inner surface of the lens component facing the optical chip is provided with a first lens, and the first lens is used for converting the light beam emitted by the optical chip into a collimated light beam; the outer surface of the lens component, which is back to the circuit board, is provided with a reflector, and the reflector is positioned right above the first lens and used for reflecting the collimated light beam vertical to the circuit board into a collimated light beam parallel to the circuit board; one end of the lens component facing the optical fiber adapter is provided with an optical port, the inner surface of the lens component facing the optical port is provided with a second lens, and the second lens is used for converting the reflected collimated light beam into a converged light beam; an inserting core wrapping the optical fiber is arranged in the optical port, an inserting core stop surface is arranged at one end of the optical port facing the second lens, and the end face of the optical fiber facing the second lens is in contact with the inserting core stop surface; a gap exists between the end face of the optical fiber and the second lens, and the end face of the optical fiber is arranged to be an inclined plane relative to the opposite side face of the optical fiber. Because a gap exists between the end face of the optical fiber and the second lens, the converged light beam is reflected when being emitted to the end face of the optical fiber due to the change of the medium, but the reflected light can be reflected to other places instead of returning according to the original path because the end face of the optical fiber is an inclined plane, so that the influence of the reflected light on the laser is reduced;

the optical fiber end face of the optical fiber and the second lens can be filled with optical cement, so that a gap is prevented from being formed between the optical fiber end face and the second lens, the converged light beam cannot be reflected when being emitted to the optical fiber end face, the problem of reflection interference cannot exist, and at the moment, the optical fiber end face can be an inclined plane or a plane.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application 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 in the embodiments of the present application.

Claims (10)

1. A light module, comprising:

a circuit board on which an optical chip is disposed;

the lens assembly is covered on the optical chip, a first lens is arranged on the inner surface of the lens assembly facing the optical chip, a reflector is arranged on the outer surface of the lens assembly facing away from the circuit board, and the reflector is positioned right above the first lens; one end of the lens is provided with a light port, and the inner surface of the lens facing the light port is provided with a second lens; an inserting core wrapping an optical fiber is arranged in the optical port, an inserting core stop surface is arranged at one end, facing the second lens, of the optical port, and the end face, facing the second lens, of the optical fiber is in contact with the inserting core stop surface; a gap exists between the optical fiber end face and the second lens, and the optical fiber end face is arranged to be an inclined plane relative to the opposite optical fiber side face;

the light beam emitted by the optical chip is converged to the optical fiber after passing through the first lens, the reflector and the second lens.

2. The optical module of claim 1, wherein a side of the optical fiber opposite to the end face of the optical fiber is perpendicular to the circuit board and is in close contact with and butted against an internal optical fiber inserted into the optical port.

3. The optical module of claim 1, wherein the lens assembly is provided with a glue dispensing groove, and the glue dispensing groove is communicated with the ferrule and is used for injecting glue to the side surface of the ferrule so as to bond the side surface of the ferrule with the inner wall of the optical port.

4. The optical module of claim 3, wherein the lens assembly is provided with two opposite dispensing slots, and the two dispensing slots are respectively communicated with the side surface of the ferrule.

5. The optical module of claim 1, wherein an end surface of the ferrule facing the ferrule stop surface is an inclined surface, and the inclined surface is parallel to the optical fiber end surface.

6. The optical module of claim 5, wherein the ferrule is a ferrule.

7. The optical module according to claim 1, wherein an angle between the fiber end face and the opposite fiber side face is 3-13 °.

8. The optical module of claim 7, wherein the angle between the fiber end face and the opposing fiber side face is 8 °.

9. A light module, comprising:

a circuit board on which an optical chip is disposed;

the lens assembly is covered on the optical chip, a first lens is arranged on the inner surface of the lens assembly facing the optical chip, and a reflector and a reflection converging lens are arranged on the outer surface of the lens assembly back to the circuit board; one end of the reflecting and converging lens is provided with an optical port, and the reflecting and converging lens is positioned between the reflecting mirror and the optical port; an inserting core wrapping an optical fiber is arranged in the optical port, a gap exists between the end face, facing the reflection converging lens, of the optical fiber and the reflection converging lens, and optical cement is filled in the gap;

the light beam emitted by the optical chip is converged to the optical fiber after passing through the first lens, the reflector and the reflection converging lens.

10. The optical module of claim 9, wherein the reflector comprises a first reflector and a second reflector, the first reflector is configured to reflect the collimated light beam emitted from the first lens to the second reflector, the second reflector is configured to reflect the reflected collimated light beam to a reflection converging lens, and the reflection converging lens is configured to reflect and converge the re-reflected collimated light beam to the optical fiber end surface.

Images