An optical module

Abstract

The application discloses an optical module, comprising an optical transceiver component, the optical transceiver component comprising a lens assembly, a fiber support and a positioning column, the fiber support having a first positioning hole, the side of the lens assembly facing the fiber support being provided with a second lens and a second positioning hole, the second positioning hole being located on one side of the second lens, and the positioning column being fixed in the first positioning hole and the second positioning hole. The surface where the second lens is located is not inwardly recessed relative to the side of the lens assembly facing the fiber support, so that the thickness of the anti-reflection film of the second lens is uniform. The lens assembly or the fiber support is provided with a first limiting boss, the lens assembly and the fiber support are limitedly connected through the first limiting boss, and there is a gap between the end surface of the second lens assembly and the fiber carried by the fiber support. In the application, the second positioning hole is located on one side of the second lens, and the surface where the second lens is located is not inwardly recessed relative to the side of the lens assembly facing the fiber support, so that the thickness of the anti-reflection film of the second lens is uniform.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber communication technology, and in particular to an optical module. BACKGROUND

[0002] The optical module includes a circuit board, a lens assembly, and a fiber holder. The circuit board is provided with an optical chip. The lens assembly is arranged on the circuit board. The lens assembly is provided with a first lens on a side facing the circuit board. The lens assembly is provided with a second lens on a side facing the fiber holder. At present, the optical module is provided with an anti-reflection film on the first lens, and / or the side of the fiber of the fiber holder facing the lens assembly is an inclined surface to reduce reflected light. However, the light signal is also reflected on the second lens, which affects the performance of the optical chip. Therefore, the anti-reflection film can be provided on the second lens to further reduce the reflected light.

[0003] The second lens is generally recessed in the lens assembly. For example, the second lens is surrounded by a three-walled or four-walled enclosure. However, due to the limitation of the enclosure, the second lens has a shielding effect when the film is plated, so that the film cannot be plated uniformly when the film is plated, resulting in different thicknesses of the anti-reflection film of the second lens. SUMMARY

[0004] The present application provides an optical module, and the thickness of the anti-reflection film of the second lens is uniform.

[0005] An optical module includes:

[0006] a circuit board;

[0007] an optical transceiver component fixed to the circuit board; wherein the optical transceiver component includes a lens assembly, a fiber holder, and a positioning column. The fiber holder has a first positioning hole. The lens assembly is provided with a second lens and a second positioning hole on a side facing the fiber holder. The second positioning hole is located on one side of the second lens. The positioning column is fixed to the second positioning hole and the first positioning hole. The second lens is provided with an anti-reflection film. The surface on which the second lens is located is not recessed inward relative to the side of the lens assembly facing the fiber holder. The lens assembly or the fiber holder is provided with a first limiting boss. The lens assembly and the fiber holder are connected by the first limiting boss. There is a gap between the second lens and the end surface of the fiber carried by the fiber holder.

[0008] An optical module includes:

[0009] a circuit board;

[0010] The optical transceiver component is fixed on the circuit board, wherein the optical transceiver component comprises a lens assembly, a fiber support and a positioning column, the fiber support has a first positioning hole, one side of the lens assembly facing the fiber support is provided with a second lens and a second positioning hole, the second positioning hole is located on one side of the second lens, the first positioning hole and the second positioning hole are arranged correspondingly, the positioning column is fixed in the first positioning hole and the second positioning hole, the second lens is coated with an anti-reflection film, and the second lens is fixed on the lens assembly through a supporting boss; the lens assembly or the fiber support is provided with a first limiting boss, the lens assembly and the fiber support are limitedly connected through the first limiting boss, and there is a gap between the second lens and the end face of the optical fiber carried by the fiber support.

[0011] Beneficial effects: the optical module provided by the application comprises a circuit board and an optical transceiver component, and the optical transceiver component is fixed on the circuit board. The optical transceiver component comprises a lens assembly, a fiber support and a positioning column, the fiber support has a first positioning hole, the fiber support has a second positioning hole, the first positioning hole and the second positioning hole are arranged correspondingly, and the fixing column is fixed in the second positioning hole and the first positioning hole to realize the alignment of the lens assembly and the fiber support. One side of the lens assembly facing the fiber support is provided with a second lens, and the second lens is coated with an anti-reflection film to reduce reflected light. The second positioning hole is located on one side of the second lens, and the distance between the second positioning hole and the second lens is small. If a positioning column integrated with the lens assembly is arranged at the position of the second positioning hole, the positioning column will affect the film coating effect when the second lens is coated. Therefore, only the second positioning hole can be arranged on one side of the second lens. The second positioning hole is located on one side of the second lens, and the surface where the second lens is located is not inwardly recessed relative to one side of the lens assembly facing the fiber support, so as to reduce the shielding object around the second lens assembly and further reduce the shielding effect during film coating, so that the thickness of the anti-reflection film of the second lens is uniform. The lens assembly or the fiber support is provided with a first limiting boss, the lens assembly and the fiber support are limitedly connected through the first limiting boss, and there is a gap between the second lens and the end face of the optical fiber carried by the fiber support, so that the optical signal converged by the second lens is coupled to the optical fiber carried by the fiber support. In the application, the second positioning hole is located on one side of the second lens, and the surface where the second lens is located is not inwardly recessed relative to one side of the lens assembly facing the fiber support, so as to reduce the shielding object around the second lens assembly and make the thickness of the anti-reflection film of the second lens uniform; the lens assembly or the fiber support is provided with a first limiting boss, the lens assembly and the fiber support are limitedly connected through the first limiting boss, so that the optical signal converged by the second lens is coupled to the optical fiber carried by the fiber support. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0013] Figure 1 A partial structure diagram of an optical communication system according to some embodiments;

[0014] Figure 2 A partial structure diagram of a host computer according to some embodiments;

[0015] Figure 3 A structure diagram of an optical module according to some embodiments;

[0016] Figure 4 An exploded view of an optical module according to some embodiments;

[0017] Figure 5 A sectional view of an optical transceiver component and a circuit board according to some embodiments;

[0018] Figure 6 An exploded view of an optical transceiver component and a circuit board according to some embodiments;

[0019] Figure 7 A structure diagram of an optical transceiver component according to some embodiments;

[0020] Figure 8 An exploded view of an optical transceiver component according to some embodiments;

[0021] Figure 9 A sectional view of an optical transceiver component according to some embodiments;

[0022] Figure 10 A structure diagram of a conventional lens assembly according to some embodiments;

[0023] Figure 11 A structure diagram of an optical fiber holder according to some embodiments;

[0024] Figure 12 A structure diagram of a first lens assembly from a first perspective according to some embodiments;

[0025] Figure 13 A structure diagram of a first lens assembly from a second perspective according to some embodiments;

[0026] Figure 14A cross-sectional view of a lens assembly according to some embodiments and a fiber holder;

[0027] Figure 15 A structural diagram of a lens assembly according to some embodiments;

[0028] Figure 16 A structural diagram of another fiber holder according to some embodiments;

[0029] Figure 17 A structural diagram of a lens assembly according to some embodiments;

[0030] Figure 18 A cross-sectional view of a lens assembly according to some embodiments and another fiber holder. DETAILED DESCRIPTION

[0031] Some embodiments of the present disclosure will be described in detail with reference to the drawings, which are shown by way of illustration. The described embodiments are merely some of the embodiments of the present disclosure, but not all of the embodiments. Based on the embodiments provided in the present disclosure, all other embodiments obtained by those skilled in the art are within the scope of protection of the present disclosure.

[0032] Unless otherwise required by the context, throughout the specification and claims, the term "comprising" is to be interpreted as open, inclusive, meaning "including, but not limited to"; the terms "first", "second" are not to be interpreted as indicating or implying relative importance or indicating the upper limit of the number; the term "multiple" means two or more; the term "connected" should be interpreted broadly, for example, "connected" can be fixedly connected, or detachably connected, or integrated, can be directly connected, or indirectly connected through an intermediate medium; the use of the terms "adapted to" or "configured to" means open and inclusive language, which does not exclude devices adapted to or configured to perform additional tasks or steps; the terms "parallel", "vertical", "same", "consistent", "flush" and the like are not limited to absolute mathematical relationships, but also include acceptable error ranges generated in practice, and also include differences based on the same design concept but due to manufacturing reasons.

[0033] In optical communication technology, in order to establish information transmission between information processing devices, information needs to be loaded onto light, and the transmission of information is achieved by using the propagation of light. Here, the light loaded with information is an optical signal. The optical signal can reduce the loss of optical power when transmitted in the information transmission device, so as to achieve high-speed, long-distance and low-cost information transmission. The signal that can be recognized and processed by the information processing device is an electrical signal. The information processing device usually includes an optical network unit (ONU), a gateway, a router, a switch, a mobile phone, a computer, a server, a tablet computer, a television, etc., and the information transmission device usually includes an optical fiber and an optical waveguide, etc.

[0034] The optical module can realize the mutual conversion between the optical signal and the electrical signal between the information processing device and the information transmission device. For example, at least one of the optical signal input end or the optical signal output end of the optical module is connected with an optical fiber, and at least one of the electrical signal input end or the electrical signal output end of the optical module is connected with an optical network unit; a first optical signal from the optical fiber is transmitted to the optical module, the optical module converts the first optical signal into a first electrical signal, and transmits the first electrical signal to the optical network unit; a second electrical signal from the optical network unit is transmitted to the optical module, the optical module converts the second electrical signal into a second optical signal, and transmits the second optical signal to the optical fiber. Since multiple information processing devices can transmit information through electrical signals, at least one of the multiple information processing devices needs to be directly connected with the optical module, without the need for all the information processing devices to be directly connected with the optical module. Here, the information processing device directly connected with the optical module is referred to as the host computer of the optical module. In addition, the optical signal input end or the optical signal output end of the optical module can be referred to as an optical port, and the electrical signal input end or the electrical signal output end of the optical module can be referred to as an electrical port.

[0035] Figure 1 A partial structure diagram of an optical communication system according to some embodiments is provided. As shown in Figure 1 the optical communication system mainly includes a remote information processing device 1000, a local information processing device 2000, a host computer 100, an optical module 200, an optical fiber 101 and a network cable 103.

[0036] One end of the optical fiber 101 extends to the direction of the remote information processing device 1000, and the other end of the optical fiber 101 is connected with the optical module 200 through the optical port of the optical module 200. The optical signal can be totally reflected in the optical fiber 101, and the propagation of the optical signal in the total reflection direction can almost maintain the original optical power. The optical signal is totally reflected in the optical fiber 101 for multiple times, so as to transmit the optical signal from the remote information processing device 1000 to the optical module 200, or transmit the optical signal from the optical module 200 to the remote information processing device 1000, thereby realizing long-distance and low-power loss information transmission.

[0037] The optical communication system can include one or more optical fibers 101, and the optical fiber 101 is detachably connected with the optical module 200, or fixedly connected. The host computer 100 is configured to provide a data signal to the optical module 200, or receive a data signal from the optical module 200, or monitor or control the working state of the optical module 200.

[0038] The host computer 100 includes a housing in the shape of a cuboid, and an optical module interface 102 disposed on the housing. The optical module interface 102 is configured to access the optical module 200, so that the host computer 100 and the optical module 200 establish a unidirectional or bidirectional electrical signal connection.

[0039] The host computer 100 also includes an external electrical interface that can access an electrical signal network. For example, the external electrical interface includes a Universal Serial Bus (USB) or a network cable interface 104, which is configured to access a network cable 103, so that the host computer 100 and the network cable 103 establish a unidirectional or bidirectional electrical signal connection. One end of the network cable 103 is connected to a local information processing device 2000, and the other end of the network cable 103 is connected to the host computer 100, so as to establish an electrical signal connection between the local information processing device 2000 and the host computer 100 through the network cable 103. For example, a third electrical signal from the local information processing device 2000 is transmitted to the host computer 100 through the network cable 103, and the host computer 100 generates a second electrical signal according to the third electrical signal. The second electrical signal from the host computer 100 is transmitted to the optical module 200, and the optical module 200 converts the second electrical signal into a second optical signal, and transmits the second optical signal to the optical fiber 101. The second optical signal is transmitted to a remote information processing device 1000 in the optical fiber 101. For example, a first optical signal from the remote information processing device 1000 is transmitted through the optical fiber 101, and the first optical signal from the optical fiber 101 is transmitted to the optical module 200. The optical module 200 converts the first optical signal into a first electrical signal, and transmits the first electrical signal to the host computer 100. The host computer 100 generates a fourth electrical signal according to the first electrical signal, and transmits the fourth electrical signal to the local information processing device 2000. It should be noted that the optical module is a tool for converting optical signals and electrical signals, and the information does not change in the conversion process of the optical signals and the electrical signals, and the encoding and decoding mode of the information can change.

[0040] In addition to including an optical network terminal, the host computer 100 also includes an optical line terminal (OLT), an optical network terminal (ONT), or a data center server, etc.

[0041] Figure 2 A partial structural diagram of a host computer according to some embodiments is shown. In order to clearly show the connection relationship between the optical module 200 and the host computer 100, Figure 2 Only the structure of the host computer 100 related to the optical module 200 is shown. As Figure 2 shown, the host computer 100 further includes a PCB circuit board 105 arranged in the shell, a cage 106 arranged on the surface of the PCB circuit board 105, a heat sink 107 arranged on the cage 106, and an electrical connector arranged inside the cage 106. The electrical connector is configured to access the electrical port of the optical module 200; the heat sink 107 has a protruding structure such as fins to increase the heat dissipation area.

[0042] The optical module 200 is inserted into the cage 106 of the host computer 100, and the optical module 200 is fixed by the cage 106. The heat generated by the optical module 200 is conducted to the cage 106, and then diffused through the heat sink 107. After the optical module 200 is inserted into the cage 106, the electrical port of the optical module 200 is connected with the electrical connector inside the cage 106, so that the optical module 200 and the host computer 100 establish a bidirectional electrical signal connection. In addition, the optical port of the optical module 200 is connected with the optical fiber 101, so that the optical module 200 and the optical fiber 101 establish a bidirectional optical signal connection.

[0043] Figure 3 A structural diagram of an optical module according to some embodiments is provided, Figure 4 An exploded view of an optical module according to some embodiments is provided. As Figure 3 and Figure 4 shown, the optical module 200 includes a shell, a circuit board 300 arranged in the shell, and an optical transceiver component 900.

[0044] The shell includes an upper shell 201 and a lower shell 202, and the upper shell 201 covers the lower shell 202 to form the above-mentioned shell with two openings 204 and 205; the outer contour of the shell generally presents a square body.

[0045] In some embodiments, the lower shell 202 includes a bottom plate 2021 and two lower side plates 2022 arranged perpendicularly to the bottom plate 2021 on both sides of the bottom plate 2021; the upper shell 201 includes a cover plate 2011, which covers the two lower side plates 2022 of the lower shell 202 to form the above-mentioned shell.

[0046] In some embodiments, the lower housing 202 includes a base plate 2021 and two lower side plates 2022 located on both sides of the base plate 2021 and perpendicular to the base plate 2021; the upper housing 201 includes a cover plate 2011 and two upper side plates located on both sides of the cover plate 2011 and perpendicular to the cover plate 2011. The two upper side plates and the two lower side plates 2022 are combined to realize that the upper housing 201 covers the lower housing 202.

[0047] The direction of the line connecting the two openings 204 and 205 can be consistent with or inconsistent with the length direction of the optical module 200. For example, opening 204 is located at the end of the optical module 200. Figure 3 The opening 205 is also located at the end of the optical module 200 (right end). Figure 3 (Left end). Alternatively, opening 204 is located at the end of optical module 200, while opening 205 is located on the side of optical module 200. Opening 204 is an electrical port, from which the gold fingers of circuit board 300 extend and are inserted into the electrical connector of host computer 100; opening 205 is an optical port, configured to connect to external optical fiber 101 so that optical fiber 101 can connect to optical transceiver component 900 in optical module 200.

[0048] The assembly method using an upper housing 201 and a lower housing 202 facilitates the installation of the circuit board 300 and optical transceiver component 900 into the aforementioned housing, which provides encapsulation and protection for these devices. Furthermore, the assembly of the circuit board 300 and optical transceiver component 900 facilitates the deployment of positioning components, heat dissipation components, and electromagnetic shielding components, thus promoting automated production.

[0049] In some embodiments, the upper housing 201 and the lower housing 202 are made of metal materials, which facilitates electromagnetic shielding and heat dissipation.

[0050] In some embodiments, the optical module 200 further includes an unlocking component 600 located outside its housing. The unlocking component 600 is configured to establish a fixed connection between the optical module 200 and the host computer, or to release the fixed connection between the optical module 200 and the host computer.

[0051] For example, the unlocking component 600 is located on the outside of the two lower side plates 2022 of the lower housing 202, and includes a locking component that matches the cage 106 of the host computer 100. When the optical module 200 is inserted into the cage 106, the locking component of the unlocking component 600 fixes the optical module 200 in the cage 106; when the unlocking component 600 is pulled, the locking component of the unlocking component 600 moves accordingly, thereby changing the connection relationship between the locking component and the host computer, so as to release the fixation between the optical module 200 and the host computer, thereby allowing the optical module 200 to be pulled out of the cage 106.

[0052] The circuit board 300 includes circuit traces, electronic components, and chips, etc. The electronic components and chips are connected according to circuit design through the circuit traces to realize power supply, electrical signal transmission, and grounding, etc. The electronic components may, for example, include capacitors, resistors, transistors, metal-oxide-semiconductor field-effect transistors (MOSFETs). The chips may, for example, include microcontroller units (MCUs), laser drive chips, transimpedance amplifiers (TIAs), limiting amplifiers, clock and data recovery chips (CDRs), power management chips, and digital signal processing (DSP) chips.

[0053] The circuit board 300 is generally a rigid circuit board. Due to its relatively hard material, the rigid circuit board can also realize a bearing function, such as the rigid circuit board can stably bear the above-mentioned electronic components and chips. The rigid circuit board can also be inserted into the electrical connector in the cage 106 of the host computer 100.

[0054] The circuit board 300 also includes a gold finger formed on the surface of its end portion. The gold finger is composed of a plurality of pins independent of each other. The circuit board 300 is inserted into the cage 106, and the gold finger is in conduction with the electrical connector in the cage 106. The gold finger can be provided only on the surface of one side of the circuit board 300 (for example, the upper surface as shown), or can be provided on the surfaces of both upper and lower sides of the circuit board 300 to provide a larger number of pins, thereby adapting to occasions where a large number of pins are required. The gold finger is configured to establish electrical connection with the host computer to realize power supply, grounding, inter-integrated circuit (I2C) signal transmission, data signal transmission, etc. Of course, flexible circuit boards are also used in some optical modules. The flexible circuit board is generally used in cooperation with the rigid circuit board to serve as a supplement to the rigid circuit board. Figure 4

[0055] Figure 5 A cross-sectional view of an optical transceiver component and a circuit board according to some embodiments. Figure 6 An exploded view of an optical transceiver component and a circuit board according to some embodiments. As shown in Figure 5 and Figure 6 ​As shown, in some embodiments, the optical matching chip 302 and the optical chip 301 are arranged on the circuit board 300, the optical matching chip 302 can be a laser driving chip 321 and / or a TIA chip 322, etc. The bare chip is adhered to the circuit board 300 by silver glue, which plays a role of fixing and heat dissipation, and then the circuit connection between the bare chip and the circuit board 300 is realized by gold wire bonding. The optical chip 301 can be an optical transmitting chip 311 and / or an optical receiving chip 312, which can be fixed side by side on the circuit board 300.

[0056] Since the optical chip 301 is attached to the circuit board 300, the light emitting surface or the light entering surface is located at the top surface of the optical chip 301, so that the light beam emitted by the optical transmitting chip is perpendicular to the circuit board 300, and the light beam received by the optical receiving chip is perpendicular to the circuit board 300; and the optical fiber 101 connected to the optical module is parallel to the circuit board 300, and the transmission direction of the light beam emitted by the optical transmitting chip and the external light beam transmitted to the optical receiving chip needs to be changed, so that the light beam emitted by the optical transmitting chip is changed by the optical transceiver component 900, so that the light beam emitted by the optical transmitting chip is reflected by the lens assembly, and the reflected light beam is parallel to the circuit board 300, so as to facilitate the coupling of the reflected light beam into the optical fiber; the received light beam transmitted by the external optical fiber is reflected by the lens assembly, and the reflected light beam is perpendicular to the circuit board 300, so as to facilitate the reception by the optical receiving chip.

[0057] As shown in Figure 5 , the optical transceiver component 900 is provided with a first lens 9121 on the side facing the circuit board 300, a reflecting surface 9131 on the side facing away from the circuit board 300, and a second lens 9142 on the side facing the optical port. The first lens 9121 is located above the optical chip 301.

[0058] Figure 7 A structural diagram of an optical transceiver component according to some embodiments. Figure 8 An exploded view of an optical transceiver component according to some embodiments. Figure 9 A sectional view of an optical transceiver component according to some embodiments. As shown in Figure 7 , Figure 8 and Figure 9 , in some embodiments, the optical transceiver component 900 includes a lens assembly 901 and an optical fiber support 902, the lens assembly 901 is connected with the optical fiber support 902, and the lens assembly 901 covers the optical matching chip 302 and the optical chip 301 on the circuit board 300, so as to place the optical matching chip 302 and the optical chip 301 in the cover cavity formed by the lens assembly 901 and the circuit board 300.

[0059] As shown in Figure 9As shown, one side of the lens assembly 901 facing the circuit board 300 is inwardly recessed to form a cover groove 911, the cover groove 911 is provided with a first lens 9121, the first lens 9121 is located directly above the optical chip 301 to realize the collimation or convergence of the light beam; one side of the lens assembly 901 facing away from the circuit board 300 is inwardly recessed to form a light port groove 913, the side wall of the light port groove 913 is a reflecting surface 9131, the reflecting surface 9131 is located above the first lens 9121 to realize the reflection of the light beam; one side of the lens assembly 901 facing the optical fiber support 902 is provided with a second lens 9142 to realize the convergence or collimation of the light beam.

[0060] The optical emission chip 311 emits a divergent light beam, which is converted into a collimated light beam by the first lens 9121, the collimated light beam is reflected by the reflecting surface 9131, and the reflected collimated light beam is converted into a convergent light beam by the second lens 9142 and coupled to the optical fiber, and then transmitted to the outside of the optical module by the optical fiber, realizing the emission of the optical signal. The light beam outside the optical module is transmitted to the second lens 9142 by the optical fiber, collimated into a collimated light beam by the second lens 9142, reflected by the reflecting surface 9131, and then vertically downward, coupled by the first lens 9121, and then vertically incident on the optical receiving chip 312, realizing the reception of the optical signal.

[0061] With the increasing transmission rate of the optical module, the optical emission chip used in the current single-wave 100G optical module is particularly sensitive to reflected light, which will affect the performance of the optical emission chip itself, thereby destroying the original characteristics of the optical emission chip, resulting in errors and other adverse effects. At present, the optical module coats an anti-reflection film on the first lens of the lens assembly, and / or the side of the optical fiber of the optical fiber support facing the lens assembly is an inclined surface to reduce the reflected light. However, the light signal will also be reflected on the side of the lens assembly where the second lens is located, thereby affecting the performance of the optical emission chip. Therefore, an anti-reflection film can be coated on the second lens to reduce the reflected light. However, due to the requirements of the optical path, there must be a certain distance between the lens assembly and the end face of the optical fiber of the optical fiber support as the focal length of the second lens, and the optical fiber support and the lens assembly need to be tightly fitted to accurately fix the position of the optical fiber and the lens assembly, therefore, the second lens is generally recessed in the lens assembly.

[0062] Figure 10 A structural diagram of a conventional lens assembly is provided according to some embodiments. As shown in FIG. 1, the lens assembly 901 is provided with a first lens 9121 and a second lens 9142, and the first lens 9121 and the second lens 9142 are arranged in the lens assembly 901 in a manner of being recessed inwardly. Figure 10As shown, the side of the lens assembly 901 facing the fiber holder is a fixed side 9146, and the fixed side 9146 is provided with a second lens 9142. The two sides of the second lens 9142 are provided with first limiting bosses 9144, and the first limiting bosses 9144 are provided with positioning columns 903. The distance between the first limiting bosses 9144 and the second lens 9142 is relatively small, so that there is a wall around the second lens 9142. Due to the limitation of the wall, the second lens 9142 has a shielding effect when coating, so that it is impossible to achieve uniform coating when coating, resulting in different thicknesses of the anti-reflection film of the second lens. In order to solve this problem, the first limiting boss 9144 is cut to move away from the second lens 9142. However, the first limiting boss 9144 away from the second lens 9142 has a small space and cannot be provided with the positioning column 903. Since the distance between the positioning column 903 and the second lens 9142 is a fixed value, the positioning column 903 can only be provided on the side of the lens assembly 901 facing the fiber holder, i.e., the fixed side 9146. However, the distance between the positioning column 903 and the second lens 9142 is relatively small, and the positioning column 903 is an integral structure with the lens assembly 901. When the second lens 9142 is coated, the positioning column 903 will affect the coating effect as a shielding object. Therefore, in some embodiments, the side of the lens assembly 901 facing the fiber holder is provided with the second lens 9142 and a second positioning hole, and the side where the second lens 9142 is located is not recessed inward relative to the side of the lens assembly 901 facing the fiber holder 902, and the second positioning hole is located on one side of the second lens 9142.

[0063] The positioning column 903 and the lens assembly 901 are two independent structural members. When the second lens 9142 is not coated, the positioning column 903 is not fixed in the second positioning hole. After the coating of the second lens 9142 is completed, the positioning column 903 is fixed in the second positioning hole. Therefore, the side where the second lens 9142 is located is not recessed inward relative to the side of the lens assembly 901 facing the fiber holder 902, and the second positioning hole is located on one side of the second lens 9142, so as to reduce the shielding object around the second lens 9142 and reduce the shielding effect, thereby making the thickness of the anti-reflection film of the second lens 9142 the same.

[0064] In some embodiments, the side where the second lens 9142 is located is flush with the side of the lens assembly 901 facing the fiber holder 902, so as to reduce the shielding object around the second lens 9142 and reduce the shielding effect, thereby making the thickness of the anti-reflection film of the second lens 9142 the same.

[0065] When the second lens 9142 is coated, the lens assembly 901 needs to be clamped by a clamp. The clamp includes a clamp frame. When the clamp clamps the lens assembly, the second lens 9142 is located in the clamp frame. However, since the clamp frame also has a certain thickness, when the second lens 9142 is coated, there is still a partial shielding effect, so that the thickness of the anti-reflection film of the second lens 9142 is not the same. In order to solve this problem, in some embodiments, the surface on which the second lens 9142 is located is outwardly protruding relative to the surface of the lens assembly 901 facing the fiber support 902, that is, the surface on which the second lens 9142 is located is protruding outwardly relative to the surface of the lens assembly 901 facing the fiber support 902.

[0066] In some embodiments, the surface on which the second lens 9142 is located is outwardly protruding relative to the surface of the lens assembly 901 facing the fiber support 902, and the distance between the surface on which the second lens 9142 is located and the surface of the lens assembly 901 facing the fiber support 902 is greater than zero.

[0067] In some embodiments, the surface on which the second lens 9142 is located is outwardly protruding relative to the surface of the lens assembly 901 facing the fiber support 902, and the distance between the surface on which the second lens 9142 is located and the surface of the lens assembly 901 facing the fiber support 902 is matched with the thickness of the clamp frame. For example, the distance between the surface on which the second lens 9142 is located and the surface of the lens assembly 901 facing the fiber support 902 is the same as the thickness of the clamp frame.

[0068] In some embodiments, the fiber support 902 has a first positioning hole, the first positioning hole is arranged corresponding to the second positioning hole of the lens assembly 901, the positioning column 903 and the lens assembly 901 are two independent structural members, the positioning column 903 is fixed to the first positioning hole and the second positioning hole, so as to realize the alignment of the lens assembly 901 and the fiber support 902, and then realize the flush of the center axis height of the second lens 9142 of the lens assembly 901 and the center axis height of the optical fiber carried by the fiber support 902.

[0069] Since the positioning column 903 and the lens assembly 901 are two independent structural members, the positioning column 903 is not assembled to the lens assembly 901 before the second lens 9142 is not coated; the positioning column 903 is assembled to the lens assembly 901 after the second lens 9142 is coated. Therefore, when the second lens 9142 is coated, there is no shielding object around the second lens 9142, reducing the shielding effect when the second lens 9142 is coated.

[0070] In order to improve the positioning accuracy of the optical fiber support 902 and the lens assembly 901, in some embodiments, the allowable error range of the positioning column 903 matches the assembly error range of the optical fiber support 902 and the lens assembly 901. For example, the allowable error range of the positioning column 903 is the same as the assembly error range of the optical fiber support 902 and the lens assembly 901; the allowable error range of the positioning column 903 is smaller than the assembly error range of the optical fiber support 902 and the lens assembly 901. Preferably, the positioning column 903 is a high-precision metal needle.

[0071] In some embodiments, the optical transceiver component 900 is provided with a first limiting boss, the lens assembly 901 and the optical fiber support 902 are connected by limiting the first limiting boss, and the second lens 9142 has a gap with the end face of the optical fiber carried by the optical fiber support 902, so that the second lens 9142 converges the light signal to be coupled to the optical fiber carried by the optical fiber support 902. That is, the lens assembly 901 or the optical fiber support 902 is provided with a first limiting boss, and the lens assembly 901 and the optical fiber support 902 are connected by limiting the first limiting boss. For example, the outer side of the second positioning hole is provided with a first limiting boss, and the end face of the optical fiber support 902 is limitedly connected with the first limiting boss of the lens assembly 901; the end face of the optical fiber support 902 has a first limiting boss, and the side of the lens assembly 901 facing the optical fiber support 902 is limitedly connected with the first limiting boss of the optical fiber support 902. Wherein, the lens assembly 901 and the optical fiber support 902 are connected by limiting the first limiting boss, which means that when the lens assembly 901 has a first limiting boss, the first limiting boss is located on the side of the second positioning hole away from the second lens, and the optical fiber support 902 is located at the first limiting boss, that is, the optical fiber support 902 contacts the first limiting boss, and the optical fiber support 902 and the first limiting boss are fixedly connected by glue; or, when the optical fiber support 902 has a first limiting boss, the lens assembly 901 is located at the first limiting boss, that is, the lens assembly 901 contacts the first limiting boss, and the lens assembly 901 and the first limiting boss are fixedly connected by glue.

[0072] Figure 11 A structural diagram of an optical fiber support according to some embodiments is provided. As shown in Figure 11 In some embodiments, the end of the optical fiber support 902a is provided with a first positioning hole 921 penetrating through, and the first positioning hole 921 is arranged opposite to the second positioning hole of the lens assembly 901, so that the optical fiber support 902a and the lens assembly 901 are connected, and the positioning column 903 passes through the second positioning hole and the first positioning hole 921 to position and install the optical fiber support 902a.

[0073] The end face of the fiber optic bracket 902a is also provided with a fiber optic hole, and the front end face of the fiber optic bracket 902a (the opposite face of the end face of the fiber optic bracket 902a) is provided with a fiber optic jack. The fiber optic hole is connected to the fiber optic jack, so that the fiber optic 923 is inserted into the fiber optic hole through the fiber optic jack. The light-incident surface of the fiber optic 923 can be located inside the fiber optic bracket 902a or protrude from the end face of the fiber optic bracket 902a.

[0074] Insert the optical fiber 923 into the optical fiber bracket 902a through the optical fiber jack. Use sealant to completely seal the gap between the optical fiber 923 and the optical fiber jack. Apply sealant to the outer periphery of the contact area between the optical fiber 923 and the optical fiber jack, and accumulate on the front end face of the optical fiber 923 and the optical fiber bracket 902a. After the sealant cures, it forms a sealing colloid to prevent coolant from entering the interior of the optical fiber bracket 902a through the optical fiber jack.

[0075] like Figure 11 As shown, an observation hole 922 is also provided at the upper end of the fiber optic bracket 902a. This observation hole 922 communicates with the fiber optic port inside the fiber optic bracket 902a, allowing observation of the insertion of the fiber optic cable 923 into the fiber optic bracket 902a. After the fiber optic cable 923 is inserted into the fiber optic bracket 902a through the fiber optic port, sealant can be applied to the observation hole 922 to form a sealing colloid, thereby sealing the observation hole 922 and preventing coolant from seeping into the interior of the fiber optic bracket 902a through the observation hole 922.

[0076] Figure 12 This is a structural diagram of a first lens assembly provided according to some embodiments, viewed from a first perspective. Figure 13 This is a structural diagram of a first lens assembly provided according to some embodiments, viewed from a second perspective. Figure 14 This is a cross-sectional view of a first lens assembly and an optical fiber support according to some embodiments. Figure 12 , Figure 13 and Figure 14As shown, the lens assembly 901a has an inwardly recessed cover groove 911 on the side facing the circuit board 300. A placement protrusion 912 is provided on the cover groove 911, and a first lens 9121 is disposed on the placement protrusion 912. The first lens 9121 is located directly above the optical chip to achieve beam collimation or focusing. The lens assembly 901a has an inwardly recessed light aperture groove 913 on the side facing away from the circuit board 300. The sidewall of the light aperture groove 913 is a reflective surface 9131, which is located above the first lens 9121 to achieve beam focusing. Reflection; the side of the lens assembly 901a facing the fiber optic bracket 902a is a fixed surface 9146, and the fixed surface 9146 is provided with a second lens 9142 to achieve beam convergence or collimation; the fixed surface 9146 is also provided with a second positioning hole 9143, the surface where the second lens 9142 is located is not recessed relative to the fixed surface 9146, and the second positioning hole 9143 is located on one side of the second lens 9142 to reduce obstructions around the second lens 9142, reduce the obstruction effect, and thus make the antireflection coating thickness of the second lens 9142 uniform.

[0077] like Figure 12 As shown, in some embodiments, the second lens 9142 is fixed to the fixed surface 9146 by a support boss 9141, and the thickness of the support boss 9141 is zero. That is, the second lens 9142 is directly fixed to the fixed surface 9146 so that the surface where the second lens 9142 of the lens assembly 901a is located is flush with the fixed surface 9146.

[0078] In some embodiments, the second lens 9142 is fixed to the fixing surface 9146 by a supporting boss 9141, the thickness of which is greater than zero. That is, the surface where the second lens 9142 of the lens assembly 901a is located protrudes outward relative to the fixing surface 9146.

[0079] In some embodiments, the second lens 9142 is fixed to the fixing surface 9146 by a support boss 9141, the thickness of which matches a preset thickness. For example, the thickness of the support boss 9141 is the same as the preset thickness, which is the thickness of the clamp frame.

[0080] like Figure 12 As shown, the second positioning hole 9143 extends from the fixing surface 9146 to the end away from the fiber optic bracket 902a. After the second lens 9142 is coated, glue is injected into the second positioning hole 9143 and the first positioning hole 921 so that the positioning post 903 is fixed in the second positioning hole 9143 and the first positioning hole 921.

[0081] The farther the second positioning hole 9143 extends from the end of the fiber holder 902a, the better the stability of the positioning column 903 and the second positioning hole 9143. Therefore, in some embodiments, the stability of the positioning column 903 and the second positioning hole 9143 can be improved by lengthening the second positioning hole 9143. For example, the second positioning hole 9143 passes through the lens assembly 901a, that is, the second positioning hole 9143 penetrates from the side of the lens assembly 901a facing the fiber holder 902a to the side of the lens assembly 901a facing away from the fiber holder 902a.

[0082] However, because the size of the second positioning hole 9143 matches the size of the positioning column 903, the amount of glue that can be placed in the second positioning hole 9143 is limited. In order to further improve the stability of the positioning column 903 and the second positioning hole 9143, in some embodiments, a storage recess 915 is provided behind the light port slot 913 of the lens assembly 901a, the positioning column 903 and the sealing glue are placed in the storage recess 915, the sealing glue is filled in the gap between the positioning column 903 and the storage recess 915, and the sealing glue is also filled in the second positioning hole 9143, so that the positioning column 903 and the second positioning hole 9143 are fixedly connected. That is, after the positioning column 903 is inserted into the second positioning hole 9143 and the first positioning hole 921, glue is injected into the storage recess 915, the gap between the positioning column 903 in the storage recess 915 and the lens assembly 901a has glue, the second positioning hole 9143 is injected with glue, and after the glue is cured, the positioning column 903 at the storage recess 915 is fixed to the lens assembly 901a, and the positioning column 903 in the second positioning hole 9143 is fixed to the second positioning hole 9143, so that the positioning column 903 and the second positioning hole 9143 are fixedly connected.

[0083] In some embodiments, one end of the positioning column 903 is located at the storage recess 915, and the other end of the positioning column 903 is located in the first positioning hole 921.

[0084] In some embodiments, one end of the positioning column 903 passes through the storage recess 915 and reaches the second positioning hole 9143 at the left end of the storage recess 915, and the other end of the positioning column 903 is located in the first positioning hole 921. Wherein, the left end of the storage recess 915 refers to the end of the storage recess 915 away from the fiber holder 902a.

[0085] In some embodiments, one end of the positioning column 903 passes through the storage recess 915 and the second positioning hole 9143 at the left end of the storage recess 915, and extends out of the lens assembly 901a, and the other end of the positioning column 903 is located in the first positioning hole 921.

[0086] To fix the positioning column 903 in the storage recess 915, in some embodiments, the storage recess 915 comprises a storage groove 9152, which is connected with the second positioning hole 9143, so that the positioning column 903 can be placed in the storage groove 9152 and the second positioning hole 9143.

[0087] In some embodiments, the storage groove 9152 is an arc structure, the arc of which is the same as the arc of the second positioning hole 9143 in the storage recess 915, and the lowest point of the storage groove 9152 is consistent with the lowest point of the second positioning hole 9143 in height, so that the positioning column 903 has good fit with the storage groove 9152 and the second positioning hole 9143.

[0088] To glue the positioning column 903, in some embodiments, the storage recess 915 further comprises a glue dispensing groove 9153, which is located on one side of the storage groove 9152 and has a height higher than that of the storage groove 9152, so that the glue can seep into the storage groove 9152.

[0089] To improve the uniformity of glue dispensing, in some embodiments, the two sides of the storage groove 9152 are provided with glue dispensing grooves 9153. The glue dispensing grooves 9153 on both sides of the storage groove 9152 can be glued, so that the glue on the positioning column 903 in the storage groove 9152 is uniform.

[0090] In some embodiments, the storage recess 915 further comprises a glue isolation boss 9151, which is located between the two storage grooves 9152, and the two sides of the glue isolation boss 9151 are provided with glue dispensing grooves 9153, and the height of the glue isolation boss 9151 is greater than that of the glue dispensing groove 9153, so as to avoid the glue on one side of the glue isolation boss 9151 flowing to the other side.

[0091] In some embodiments, the height of the glue on the glue dispensing groove 9153 is lower than that of the glue isolation boss 9151, so as to avoid the glue on both sides of the glue isolation boss 9151 from flowing together. That is, after the glue on the glue dispensing groove 9153 solidifies, the height of the sealant on the glue dispensing groove 9153 is lower than that of the glue isolation boss 9151.

[0092] As Figure 12As shown, in some embodiments, the fixing surface 9146 is further provided with a first limiting boss 9144. The first limiting boss 9144 protrudes outward relative to the surface where the second lens 9142 is located. The first limiting boss 9144 is located on the side of the second positioning hole 9143 away from the second lens 9142. The distance between the first limiting boss 9144 and the second lens 9142 is greater than the distance between the second positioning hole 9143 and the second lens 9142. The side of the first limiting boss 9144 and the fixing surface 9146 form a supporting groove 914. The end face of the fiber optic bracket 902a contacts the first limiting boss 9144 and is limited and connected by adhesive.

[0093] In some embodiments, the first limiting boss 9144 is located at the edge of the fixing surface 9146, and the end face edge of the fiber optic bracket 902a contacts the first limiting boss 9144 and achieves a limiting connection by adhesive.

[0094] In some embodiments, the first limiting boss 9144 in the lens assembly 901a extends from the side of the lens assembly 901a facing away from the circuit board 300 to the side of the lens assembly 901a facing the circuit board 300.

[0095] like Figure 12 As shown, in some embodiments, the fixed surface 9146 is further provided with a second limiting boss 9145, which is fixed to the side of the first limiting boss 9144 facing the fiber optic bracket 902a, so that the second limiting boss 9145 and the first limiting boss 9144 form a limiting notch, and the end edge of the fiber optic bracket 902a is engaged at the limiting notch to further realize the limiting connection between the fiber optic bracket 902a and the lens assembly 901a.

[0096] The second lens 9142, lens assembly 901a, support boss 9141, first limiting boss 9144, and second limiting boss 9145 can be independent structural components or components of an integrally formed structural component.

[0097] Figure 15 This is a structural diagram of a second lens assembly provided according to some embodiments. For example... Figure 15 As shown, in some embodiments, the first limiting boss 9144 in the lens assembly 901b includes a first limiting boss portion 9144a and a second limiting boss portion 9144b. The first limiting boss portion 9144a and the second limiting boss portion 9144b are not connected. The first limiting boss portion 9144a extends downward from the side of the lens assembly 901b facing away from the circuit board 300, but does not extend to the side of the lens assembly 901b facing the circuit board 300. The second limiting boss portion 9144b extends upward from the side of the lens assembly 901b facing the circuit board 300, but does not extend to the side of the lens assembly 901b facing away from the circuit board 300.

[0098] In some embodiments, the first limiting boss part 9144a and the second limiting boss part 9144b have the same thickness, and the first limiting boss part 9144a and the second limiting boss part 9144b are respectively in contact with the end surface of the optical fiber support 902a to avoid the optical fiber carried by the optical fiber support 902a from deviating from the preset position.

[0099] In addition to the structure of the first limiting boss 9144 being different, and the lens assembly 901b not having the second limiting boss, other structures are the same as those of the lens assembly 901a, which will not be described here.

[0100] Figure 16 A structural diagram of another optical fiber support according to some embodiments. Figure 17 A structural diagram of a third lens assembly according to some embodiments. Figure 18 A sectional view of the third lens assembly and another optical fiber support according to some embodiments. As shown in Figure 16 , Figure 17 and Figure 18 , the lens assembly 901c does not have the first limiting boss and the second limiting boss, and other structures are the same as those of the lens assembly 901a, which will not be described here.

[0101] As shown in Figure 16 and Figure 18 , in some embodiments, the edge of the end surface of the optical fiber support 902b is provided with a first limiting boss 926, the first limiting boss 926 protrudes outward relative to the end surface of the optical fiber support 902b, and the edge of the side of the lens assembly 901c facing the optical fiber support 902b is in contact with the first limiting boss 926 and is limitedly connected by glue.

[0102] In some embodiments, the first limiting boss 926 in the optical fiber support 902b extends from the side of the optical fiber support 902b facing away from the circuit board 300 to the side of the optical fiber support 902b facing toward the circuit board 300.

[0103] In some embodiments, the side of the optical fiber support 902b facing the lens assembly 901c is also provided with a second limiting boss 927, the second limiting boss 927 is fixed to the side of the first limiting boss 926 facing the lens assembly 901c, so that the second limiting boss 927 and the first limiting boss 926 form a limiting gap, and the end edge of the lens assembly 901c is clamped in the limiting gap to further realize the limiting connection between the optical fiber support 902b and the lens assembly 901c.

[0104] In some embodiments, in addition to being provided with the first limiting boss 926 and the second limiting boss 927, other structures of the optical fiber support 902b are the same as those of the optical fiber support 902a, which will not be described here.

[0105] like Figure 16 As shown, in some embodiments, in addition to the first limiting boss 926 and the second limiting boss 927, the fiber optic bracket 902b also has a fiber optic slot 924 and a fiber optic hole 925. The fiber optic slot 924 is located at the front end of the fiber optic bracket 902b, and the fiber optic hole 925 is located at the end of the fiber optic bracket 902b. The fiber optic slot 924 communicates with the fiber optic hole 925. The fiber optic slot 924 has a notch pointing to the right and upward, so that the fiber optic cable 923 can be inserted into the fiber optic slot 924 and then inserted into the fiber optic hole 925 through the fiber optic slot 924.

[0106] In some embodiments, the edge of the fiber optic slot 924 is provided with a dispensing groove 928, and adhesive is dispensed into the dispensing groove 928 so that the adhesive completely seals the gap between the fiber optic cable and the fiber optic socket. The sealant is applied to the outer periphery of the contact area between the fiber optic cable and the fiber optic slot, and accumulates on the front end face of the fiber optic cable and the fiber optic bracket 902b. After the sealant cures, it forms a sealing colloid to prevent coolant from entering the fiber optic bracket 902b through the fiber optic socket.

[0107] In some embodiments, the optical module includes a circuit board and an optical transceiver component, with the optical transceiver component fixed to the circuit board. The optical transceiver component includes a lens assembly, an optical fiber support, and a positioning post. The optical fiber support has a first positioning hole and a second positioning hole, which are correspondingly arranged. The positioning post is fixed to the second positioning hole and the first positioning hole to align the lens assembly with the optical fiber support. A second lens is disposed on the side of the lens assembly facing the optical fiber support, and the second lens is coated with an anti-reflection film to reduce reflected light. The second positioning hole is located on one side of the second lens, and the distance between the second positioning hole and the second lens is small. If a positioning post integrated with the lens assembly is disposed at the location of the second positioning hole, the positioning post would act as an obstruction during the coating process of the second lens, affecting the coating effect. Therefore, only a second positioning hole can be disposed on one side of the second lens. The second positioning hole is located on one side of the second lens, and the surface of the second lens does not recede inward relative to the side of the lens assembly facing the optical fiber support, thereby reducing obstructions around the second lens assembly and reducing the obstruction effect during coating, resulting in a uniform thickness of the anti-reflection film on the second lens. The lens assembly or fiber optic support is provided with a first limiting boss, and the lens assembly and the fiber optic support are limited and connected by the first limiting boss. There is a gap between the end face of the second lens and the fiber optic cable carried by the fiber optic support, so that the optical signal converged by the second lens is coupled to the fiber optic cable carried by the fiber optic support. In some embodiments, the second positioning hole is located on one side of the second lens, and the surface of the second lens is not recessed inward relative to the side of the lens assembly facing the fiber optic support, so as to reduce obstructions around the second lens assembly and make the antireflective coating of the second lens uniform in thickness. The lens assembly or fiber optic support is provided with a first limiting boss, and the lens assembly and the fiber optic support are limited and connected by the first limiting boss, so that the optical signal converged by the second lens is coupled to the fiber optic cable carried by the fiber optic support.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An optical module characterized by comprising: include: Circuit board; An optical transceiver component is fixed to the circuit board. The optical transceiver component includes a lens assembly, an optical fiber support, and a positioning post. The optical fiber support has a first positioning hole. The lens assembly has a second lens and a second positioning hole on its side facing the optical fiber support. The second positioning hole is located on one side of the second lens. The positioning post is fixed to the second positioning hole and the first positioning hole. The second lens is coated with an anti-reflection film, and the surface of the second lens protrudes outward relative to the side of the lens assembly facing the optical fiber support. The lens assembly or the optical fiber support has a first limiting boss, and the lens assembly and the optical fiber support are connected by the first limiting boss. There is a gap between the second lens and the end face of the optical fiber carried by the optical fiber support.

2. The optical module according to claim 1, characterized by A first limiting protrusion is provided on the edge of the lens assembly facing the fiber optic bracket. The first limiting protrusion is located on the side of the second positioning hole away from the second lens and extends downward from the upper surface of the lens assembly to the lower surface of the lens assembly. A second limiting protrusion is provided on the side of the first limiting protrusion facing the fiber optic bracket, and the second limiting protrusion and the first limiting protrusion form a limiting notch. The fiber optic bracket is engaged with the limiting notch.

3. The optical module according to claim 1, characterized by A first limiting boss is provided on the edge of the lens assembly facing the fiber optic bracket. The first limiting boss is located on the side of the second positioning hole away from the second lens. The first limiting boss includes a first limiting boss portion and a second limiting boss portion. The first limiting boss portion extends downward from the upper surface of the lens assembly but does not reach the lower surface of the lens assembly. The second limiting boss portion extends upward from the lower surface of the lens assembly but does not reach the upper surface of the lens assembly. The first limiting boss portion and the second limiting boss portion are disposed opposite to each other and are not connected.

4. The optical module according to claim 1, characterized by A first limiting protrusion is provided on the edge of the fiber optic bracket facing the lens assembly. The first limiting protrusion extends downward from the upper surface of the fiber optic bracket to the lower surface of the fiber optic bracket. A second limiting protrusion is provided on the side of the first limiting protrusion facing the lens assembly. The second limiting protrusion and the first limiting protrusion form a limiting notch. The lens assembly is engaged with the limiting notch.

5. The optical module according to claim 1, characterized by The lens assembly has an optical slot on the side facing away from the circuit board. A placement recess is provided behind the optical slot. A positioning post and a sealing compound are placed in the placement recess. The gap between the positioning post and the placement recess is filled with the sealing compound. The gap between the positioning post and the second positioning hole is also filled with the sealing compound.

6. The optical module according to claim 5, characterized by The recessed area includes a storage groove, an adhesive dispensing groove, and an adhesive-separating boss. The storage groove is connected to the second positioning hole. The positioning post is fixed to the storage groove and the second positioning post. The adhesive dispensing groove is located on one side of the storage groove, and the height of the adhesive dispensing groove is higher than the height of the storage groove. The adhesive-separating boss is located between the two storage grooves, and the height of the adhesive-separating boss is higher than the height of the adhesive dispensing groove.

7. An optical module characterized by comprising: include: A circuit board; An optical transceiver component is fixed on the circuit board; wherein the optical transceiver component comprises a lens assembly, a fiber holder and a positioning column, the fiber holder has a first positioning hole, one side of the lens assembly facing the fiber holder is provided with a second lens and a second positioning hole, the second positioning hole is located on one side of the second lens, the positioning column is fixed in the first positioning hole and the second positioning hole, the second lens is coated with an anti-reflection film, the second lens is fixed on the lens assembly through a supporting boss, the thickness of the supporting boss is greater than zero; the lens assembly or the fiber holder is provided with a first limiting boss, the lens assembly and the fiber holder are connected through the first limiting boss, and there is a gap between the second lens and the end face of the fiber carried by the fiber holder.

8. The optical module according to claim 7, characterized by One side of the lens assembly away from the circuit board is provided with an optical port slot, a storage recess is arranged behind the optical port slot, a positioning column and a sealing gel are placed in the storage recess, the gap between the positioning column and the storage recess is filled with the sealing gel, and the gap between the positioning column and the second positioning hole is also filled with the sealing gel.

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