Wavelength division multiplexing device

Abstract

The embodiment of the application discloses a kind of wavelength division multiplexing devices, including frame and receiver, frame and receiver are installed together;Frame has first connecting part, second connecting part and third connecting part, sequentially along first direction arrangement and integrated;First connecting part is equipped with collimator, second connecting part is equipped with beam splitter, third connecting part is equipped with reflector, reflector and third connecting part integrated;Collimator receives incident light and collimates incident light to form collimated light beam, beam splitter receives collimated light beam and collimated light beam is divided into multiple beam exit beams with different wavelengths, reflector receives multiple beam exit beams and multiple beam exit beams are respectively reflected and converged to receiver.The technical scheme of the application can integrate collimator, reflector and beam splitter in frame, make the packaging between each component simple, production cost is lower, assembly efficiency is higher, and integrated reflector is compared to the combination of original right-angle prism and focusing lens, and light energy attenuation is smaller.

Description

[Technical Field]

[0001] This application relates to the field of optical fiber communication technology, and in particular to a wavelength division multiplexing device. [Background Technology]

[0002] WDM (Wavelength-division multiplexing) is a technology that uses multiple lasers to simultaneously transmit multiple wavelengths of laser light over a single optical fiber. Existing CWDM (Coarse Wavelength Division Multiplexing) systems mainly consist of optical fibers, collimating lenses, multiplexers / demultiplexers (MUX / DEMUX), detectors (PDs), and lasers. Theoretically, DWDM (Dense Wavelength Division Multiplexing) can employ a similar approach, but it is significantly more complex.

[0003] Injection molding involves heating a molding compound to a specific temperature, melting it into a liquid, and then injecting the molten compound into a sealed mold cavity under high pressure. The mold is then opened to obtain the desired injection-molded product. Injection molding significantly improves production efficiency and reduces costs, and it has wide applications in optical communication.

[0004] Currently, wavelength division multiplexing (WDM) devices on the market employ a free-space discrete structure to achieve optical demultiplexing. In this structure, n wavelengths of incident light propagate in an optical fiber, are collimated, and then split into multiple light rays of different wavelengths. After convergence, the light rays are deflected at 90° and incident on a photodiode (PD), where a current is generated to complete the conversion from optical to electrical signals. However, this type of WDM device requires multiple discrete components, resulting in long assembly time and high material costs. Even if some WDM devices integrate some components, they still contain discrete parts, and the integration level is not high enough. Furthermore, the use of right-angle prisms and focusing lenses increases light attenuation. [Summary of the Invention]

[0005] In view of this, embodiments of this application provide a wavelength division multiplexing device to solve the problems in the prior art.

[0006] In a first aspect, embodiments of this application provide a wavelength division multiplexing (WDM) device, comprising: a frame and a receiver, the receiver being mounted together with the frame; the frame having a first connecting portion, a second connecting portion, and a third connecting portion, the first connecting portion, the second connecting portion, and the third connecting portion being arranged sequentially along a first direction and integrally formed; a collimator is provided on the first connecting portion, a beam splitter is provided on the second connecting portion, and a reflector is provided on the third connecting portion, the reflector being integrally formed with the third connecting portion; the collimator receives incident light and collimates the incident light to form a collimated beam, the beam splitter receives the collimated beam and splits the collimated beam into multiple outgoing beams with different wavelengths, and the reflector receives the multiple outgoing beams and reflects and converges the multiple outgoing beams to the receiver.

[0007] The solution provided in this embodiment allows the frame to be manufactured as a single piece, integrating a collimator, beam splitter, and reflector within the frame. This reduces assembly difficulty, improves assembly efficiency, simplifies packaging, lowers costs, and increases assembly efficiency. It can demultiplex light of different wavelengths and receive them separately for use in optical communication equipment.

[0008] In a preferred embodiment, the collimator is integrally formed on the first connecting portion, and the collimator has an incident surface and a collimating surface in the first direction, with the collimating surface facing the beam splitter; the incident light enters the collimator from the incident surface, is collimated by the collimating surface to form a collimated beam, and is then projected onto the beam splitter.

[0009] The solution provided in this embodiment makes the collimator an integrated component of the frame. During assembly, the assembly process of the wavelength division multiplexing device can be completed simply by installing the beam splitter on the second connecting part, thereby further improving the integration and assembly efficiency of the wavelength division multiplexing device.

[0010] In a preferred embodiment, the first connecting portion has a mounting component located at the light-incident surface of the collimator, and an external transmitter is connected to the light-incident surface of the collimator via the mounting component.

[0011] The solution provided in this embodiment couples the external transmitter and the collimator through the mounting components, making the connection between the external transmitter and the collimator more secure. The incident optical axis of the external transmitter and the collimating optical axis of the collimator can be aligned, allowing the incident light to enter the collimator orthogonally.

[0012] In a preferred embodiment, the mounting component is a mounting hole that extends along the first direction, the light-incident surface of the collimator is the bottom of the mounting hole near the second connection portion along the first direction, and the axis of the mounting hole and the optical axis of the light-incident surface are on the same straight line.

[0013] The solution provided in this embodiment uses the light-incident surface of the collimator as the bottom of the mounting hole. By using the coaxial arrangement of the mounting hole and the light-incident surface, when the external transmitter is inserted into the mounting hole, the mounting hole can be used as a guide channel to complete docking with the light-incident surface and align the optical path, thereby achieving rapid coupling between the external transmitter and the collimator.

[0014] In a preferred embodiment, an air hole is formed on the inner wall of the mounting hole, and the air hole is connected to the receiver.

[0015] The solution provided in this embodiment enables air to be expelled through the vent when an external power supply is installed in the mounting hole by dispensing adhesive, thereby further improving the precision and sealing of the wavelength division multiplexing device.

[0016] In a preferred embodiment, the receiver has a connection surface that is parallel to the first direction and faces the frame; the first connection portion and the third connection portion are respectively connected to the connection surface, the second connection portion is spaced from the connection surface, a limiting groove is provided on the surface of the second connection portion facing the connection surface, and the beam splitter is fixed in the limiting groove.

[0017] The solution provided in this embodiment limits the beam splitter between the frame and the receiver, and between the collimator and the reflector, by using a limiting groove. This defines the position of the beam splitter, fixes the propagation path of the light, and prevents the light from deviating when propagating in the beam splitter.

[0018] In a preferred embodiment, the receiver includes a photoelectric converter and a circuit board, the connecting surface being the surface of the circuit board facing the frame, the photoelectric converter being mounted on the connecting surface, the circuit board being connected to the first connecting portion and the third connecting portion through the connecting surface, and the photoelectric converter being located at the light outlet of the reflector.

[0019] The solution provided in this embodiment serves both to support the frame and to enclose the beam splitter within the frame and the circuit board, protecting it from environmental factors and preventing light propagating within the beam splitter from escaping. By arranging the reflectors and photoelectric conversion components in a third direction perpendicular to the first and second directions, the length of the frame in the first direction is saved by changing the direction of the optical path. The thickness of the frame in the third direction is utilized, further saving the installation space occupied by the entire wavelength division multiplexing device and providing more space and freedom for the installation of other components of the optical communication equipment.

[0020] In a preferred embodiment, the first connecting part and the third connecting part are respectively fixed to the connecting surface by dispensing adhesive.

[0021] The solution provided in this embodiment forms a complete, highly integrated wavelength division multiplexing device in which no relative displacement occurs between the components.

[0022] In a preferred embodiment, the reflector's reflective surface is a double-conical surface, and the beam splitter and the receiver are located on opposite sides of the optical axis of the reflective surface.

[0023] The solution provided in this embodiment uses the double conical surface of the reflector as a reflecting surface to focus the emitted light beam of the corresponding wavelength from a large spot into a small spot before entering the receiver, so that the emitted light beam can be fully received by the receiver.

[0024] In a preferred embodiment, the reflecting surface is a convex mirror that protrudes toward the receiver or a concave mirror that is recessed in the opposite direction to the receiving surface.

[0025] The solution provided in this embodiment enables convex and concave mirrors to deflect light by changing the direction of light propagation.

[0026] In a preferred embodiment, the reflector includes a plurality of reflective elements arranged along a second direction, which intersects with the first direction;

[0027] The number of the reflecting units is the same as the number of the emitted light beams, and each reflecting unit receives one emitted light beam.

[0028] Each of the reflecting units has an angle with the corresponding received outgoing beam.

[0029] The solution provided in this embodiment uses each reflection unit to reflect the emitted light beam of the corresponding wavelength to the corresponding position in the receiver, so that each emitted light beam of each wavelength has an independent optical path and does not interfere with each other. Each corresponding reflection unit deflects the emitted light beam of each wavelength at a certain angle and transmits it to the photoelectric conversion device corresponding to each wavelength in the receiver. Each photoelectric conversion device transmits and uses the emitted light beam of each wavelength, thereby achieving the function of demultiplexing the incident light.

[0030] In a preferred embodiment, the multiple emitted beams form an emission plane, the multiple reflecting units are located on the emission plane, and the second direction is perpendicular to the first direction.

[0031] With the solution provided in this embodiment, the emitted beams after passing through the beam splitter are emitted horizontally and propagate vertically downwards into the receiver.

[0032] In a preferred embodiment, the beam splitter has a reflector, a light guide, and a plurality of filters;

[0033] Along the first direction, the light guide has an incident light side and an exit light side. The incident light side has an incident light portion and a reflective light portion. The incident light portion is used to receive the collimated beam. The reflective light portion is equipped with the reflector. The exit light side is equipped with the plurality of filters. The filters are used to simultaneously transmit and reflect light.

[0034] Each of the filters outputs a beam of light, and the wavelengths of the beams output by different filters are different.

[0035] The solution provided in this embodiment utilizes the characteristic of a filter that only transmits light of a specific wavelength to separate light of different wavelengths from the incident light, and then transmits the light to the receiver through different optical paths, thereby achieving demultiplexing of the light and generating different electrical signals in the receiver through photoelectric conversion.

[0036] In a preferred embodiment, the light-incident side and the light-outcident side are parallel to each other, and the spacing between two adjacent filters is the same.

[0037] The solution provided in this embodiment ensures that the emitted light beams through the filter are projected onto the reflector in parallel with each other. The light spots reflected and converged by the reflector are of uniform size and have the same spacing. The light energy attenuation of each wavelength of light received by the receiver is also basically the same.

[0038] Secondly, embodiments of this application provide an optical converter, including a transmitter and a wavelength division multiplexing device as described in the first aspect, wherein the transmitter is connected to the collimator of the wavelength division multiplexing device.

[0039] Thirdly, embodiments of this application provide an optical communication device, including a signal transceiver and an optical converter as described in the second aspect, wherein the optical converter is connected to the signal transceiver.

[0040] Compared with the prior art, this technical solution has at least the following beneficial effects:

[0041] The wavelength division multiplexing device disclosed in this application integrates components such as collimators, reflectors, and beam splitters into a single frame, simplifying the packaging of each component, reducing production costs, increasing assembly efficiency, and reducing light energy attenuation compared to the original combination of right-angle prisms and focusing lenses. [Attached Image Description]

[0042] Figure 1 This is a schematic diagram of the wavelength division multiplexing device provided in the embodiments of this application;

[0043] Figure 2 This is a perspective view of the wavelength division multiplexing device provided in the embodiments of this application;

[0044] Figure 3 This is a side view of the wavelength division multiplexing device provided in the embodiments of this application;

[0045] Figure 4 This is an end view of the wavelength division multiplexing device provided in the embodiments of this application;

[0046] Figure 5 This is a top view of the optical path of the wavelength division multiplexing device provided in the embodiments of this application when transmitting light.

[0047] Figure 6 This is a side view of the optical path of the wavelength division multiplexing device provided in the embodiments of this application when transmitting light.

[0048] Figure 7 This is a perspective view of the optical path of the wavelength division multiplexing device provided in the embodiments of this application when transmitting light.

[0049] Figure 8 This is an optical path diagram of the reflector in the frame of the wavelength division multiplexing device provided in this application embodiment when the reflecting surface is a convex mirror;

[0050] Figure 9 This is an optical path diagram of the reflector in the frame of the wavelength division multiplexing device provided in this application, where the reflecting surface is a concave mirror;

[0051] Figure 10 This is a schematic diagram of the structure of the wavelength division multiplexing device provided in this application when the reflecting surface of the reflector in the frame is a convex mirror;

[0052] Figure 11 This is a schematic diagram of the structure of the wavelength division multiplexing device provided in this application, where the reflecting surface of the reflector in the frame is a concave mirror.

Detailed Implementation Methods

[0053] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0054] This application discloses a wavelength division multiplexing (WDM) device manufactured using injection molding. It can demultiplex light of different wavelengths in an optical fiber and receive them separately for use in optical communication equipment. The following description uses CWDM as an example, but the technical features used are not limited to CWDM systems.

[0055] like Figures 1 to 11 As shown, this application discloses a wavelength division multiplexing (WDM) device. See also... Figure 1 and Figure 2The wavelength division multiplexing device of this embodiment includes a frame 1 and a receiver 2, which are installed together with the frame 1. The frame 1 has a first connecting part 3, a second connecting part 4 and a third connecting part 5, which are arranged sequentially along the first direction D1 and integrally formed. A collimator 6 is provided on the first connecting part 3, a beam splitter 7 is provided on the second connecting part 4, and a reflector 8 is provided on the third connecting part 5. The reflector 8 is integrally formed with the third connecting part 5. The collimator 6 receives the incident light L-in and collimates the incident light L-in to form a collimated beam L-co. The beam splitter 7 receives the collimated beam L-co and splits the collimated beam L-co into multiple outgoing beams L-out with different wavelengths. The reflector 8 receives the multiple outgoing beams L-out and reflects and converges the multiple outgoing beams L-out to the receiver 2.

[0056] The wavelength division multiplexing device of this embodiment is manufactured by making the frame 1 into an integral structure. The collimator 6, beam splitter 7 and reflector 8 are integrated in the frame 1, which reduces the assembly difficulty, improves the assembly efficiency, makes the packaging simpler, lowers the cost and increases the assembly efficiency. It can demultiplex light of different wavelengths and receive them separately for use in optical communication equipment.

[0057] Specifically, in the wavelength division multiplexing device of this embodiment, the frame 1 is an injection-molded part, which is positioned in the first direction D1 (from... Figure 1 The frame 1 is divided into three parts (from left to right). The leftmost part is the first connecting part 3, which directly contacts and connects to the receiver 2. It can be fixed together by adhesive application or other methods, or it can be connected without contact with the receiver 2. The middle part is the second connecting part 4, which can also connect to the receiver 2. The rightmost part is the third connecting part 5, which directly contacts and connects to the receiver 2. It can also be fixed together by adhesive application or other methods, or it can be connected without contact with the receiver 2. However, at least one of the three parts of the frame 1 is connected to the receiver 2. The first connecting part 3, the second connecting part 4, and the third connecting part 5 are integrally molded. During manufacturing, the frame 1 is made into a single injection-molded structure, forming a complete part. Assembly only requires three steps: adhesive application, alignment, and bonding. This simple and convenient operation reduces assembly difficulty and improves assembly efficiency.

[0058] See Figure 2 and Figure 3In the wavelength division multiplexing device of this embodiment, the receiver 2 has a connecting surface 9, which is parallel to the first direction D1 and faces the frame 1. The first connecting part 3 and the third connecting part 5 are respectively connected to the connecting surface 9. The second connecting part 4 has a gap 10 between it and the connecting surface 9. A limiting groove 11 is provided on the surface of the second connecting part 4 facing the receiver 2, and the beam splitter 7 is fixed in the limiting groove 11. The first connecting part 3 and the third connecting part 5 fix the frame 1 and the receiver 2 from the left and right sides respectively to form a stable structure, so that the collimator 6 and the reflector 8 can be fixed in a position on the connecting surface 9 that will not move relative to each other. The beam splitter 7 clamped on the second connecting part 4 has its installation range defined by the edges of the limiting groove 11 and provides support to counteract gravity. During assembly, the beam splitter 7 is first attached to the frame 1, and the position of the beam splitter 7 is defined by the limiting groove 11 on the frame 1. After attachment, the beam splitter 7 is fixed to the frame 1 by applying adhesive. Through these structural designs, the beam splitter 7 is limited between the frame 1 and the receiver 2, and between the collimator 6 and the reflector 8, by the limiting groove 11. This limits the position of the beam splitter 7, and the optical paths of the collimator 6, beam splitter 7 and reflector 8 can be fixed and not interfered with by the outside world. This fixes the propagation path of the light and prevents the light from deviating when it propagates in the beam splitter 7.

[0059] See Figure 2 and Figure 3 In the wavelength division multiplexing device of this embodiment, the receiver 2 includes a photoelectric converter 12 and a circuit board 13. The connecting surface 9 is the surface of the circuit board 13 facing the frame 1. The photoelectric converter 12 is mounted on the connecting surface 9 of the circuit board 13 by adhesive bonding. A wire bond is formed between the photoelectric converter 12 and the circuit board 13 to form an electrical signal connection line, used to transmit the photoelectric converted signal to the processing circuit. The circuit board 13 is connected to the first connecting part 3 and the third connecting part 5 via the connecting surface 9. The photoelectric converter 12 is located at the light outlet of the reflector 8. The photoelectric converter 12 consists of multiple photodiodes (PDs) arranged along a second direction D2. The second direction D2 is perpendicular to the first direction D1 and parallel to the circuit board 13. Figure 2 and Figure 3 As can be seen, circuit board 13 is a flat plate with a certain length, width, and relatively thin thickness. The upper surface of circuit board 13 is the connecting surface 9. The first connecting part 3 is connected to the left half of the connecting surface 9, and the third connecting part 5 is connected to the right half of the connecting surface 9. The photoelectric conversion element 12 is also disposed on the right half of the connecting surface 9. The reflector 8 extends suspended from the third connecting part 5 above the photoelectric conversion element 12, and a certain distance is maintained between the reflector 8 and the photoelectric conversion element 12. Figure 2 and Figure 3In this structure, circuit board 13 serves both to support the frame 1 and to enclose the beam splitter 7 within the frame 1 and circuit board 13, protecting the beam splitter 7 from environmental influences and preventing light propagating within the beam splitter 7 from escaping. By arranging the reflector 8 and photoelectric conversion element 12 in the third direction D3, the length of the frame 1 in the first direction D1 is reduced by changing the optical path direction. The thickness of the frame 1 in the third direction D3 is utilized, further saving installation space in the entire wavelength division multiplexing device and providing more space and flexibility for the installation of other components of the optical communication equipment. The third direction D3 is perpendicular to both the first direction D1 and the second direction D2.

[0060] In the wavelength division multiplexing device of this embodiment, the first connecting part 3 and the third connecting part 5 are fixed to the connecting surface 9 of the circuit board 13 by dispensing adhesive. During the packaging process, adhesive is first applied to the connecting parts of the first connecting part 3 and the third connecting part 5. Then, the reflector 8 and the photoelectric conversion element 12 are aligned. Then, the frame 1 (which has the transmitter 14 and the beam splitter 7 bonded together, and integrates the collimator 6 and the reflector 8) is inverted and placed on the connecting surface 9 of the circuit board 13. The optical fiber of the transmitter 14 is allowed to pass light, the circuit board 13 is powered on, and the position of the frame 1 is adjusted until the response current of the photoelectric conversion element 12 meets the requirements. Finally, adhesive is applied to fix the frame 1 to the circuit board 13, thereby forming a complete, highly integrated wavelength division multiplexing device in which no relative displacement occurs between the components.

[0061] See Figures 1 to 4In the wavelength division multiplexing (WDM) device of this embodiment, the collimator 6 is integrally formed on the first connecting part 3. The collimator 6 has an incident surface 15 and a collimating surface 16 in the first direction D1, with the collimating surface 16 facing the beam splitter 7. The incident light L-in enters the collimator 6 from the incident surface 15, is collimated by the collimating surface 16 to form a collimated beam L-co, and is then projected onto the beam splitter 7. At this time, the collimator 6 becomes an integrated component of the frame 1. During assembly, the beam splitter 7 only needs to be installed on the second connecting part 4 to complete the assembly process of the WDM device, further improving the integration and assembly efficiency of the WDM device. The first connecting part 3 has a mounting component 17, which is located at the incident surface 15 of the collimator 6. The external transmitter 14 is connected to the incident surface 15 of the collimator 6 through the mounting component 17. The external emitter 14 and collimator 6 are coupled through a mounting component 17, making the connection between them more secure. This ensures the alignment of the incident optical axis of the external emitter 14 with the collimating optical axis of the collimator 6, allowing the incident light L-in to enter the collimator 6 orthogonally. Specifically, the mounting component 17 can be any fixing structure capable of securing the external emitter 14, including but not limited to slotted, hole-shaped, and threaded structures. In this embodiment, the mounting component 17 is a mounting hole 17 extending along the first direction D1. The light-incident surface 15 of the collimator 6 is located near the bottom of the second connecting portion 4 along the first direction D1 of the mounting hole 17, and the axis of the mounting hole 17 is collinear with the optical axis of the collimator 6. Figure 4 In the structure, the bottom of the mounting hole 17 is the lens surface of the collimator 6. The mounting hole 17 can be a through hole with both ends or a concave hole closed at one end. During assembly, the collimator 6 only needs to be installed at the bottom of the mounting hole 17. In use, the transmitter 14 (e.g., the pigtail of an optical fiber), which serves as an external light source, is directly inserted into the mounting hole 17 to the bottom to align with the collimator 6. Then, it is fixed in the mounting hole 17 by dispensing adhesive. The transmitter 14 and the collimator 6 are then assembled to form the fiber optic glass collimator. Preferably, the collimator 6 is integrally formed with the first connecting part 3. During the injection molding process of the frame 1, while the mounting hole 17 is formed at the first connecting part 3 by injection molding, the lens surface of the collimator 6 with collimation function is formed at the bottom of the mounting hole 17. That is, the position and optical axis of the collimator 6 are fixed during the injection molding process of the frame 1, thereby shaping the optical path. Then, when the external light source is connected, it is ensured that the incident light L-in is perpendicularly incident on the collimator 6, further improving the integration and assembly efficiency of the wavelength division multiplexing device.

[0062] Combination Figures 2 to 4When assembling the transmitter 14 and collimator 6, dispensing is often a convenient method. However, dispensing inevitably leads to glue overflow or excessive use. Therefore, it is necessary to drain this overflowing glue through the mounting hole 17. This not only avoids affecting light propagation but also allows for the reuse of the glue. Therefore, an air vent 18 is provided on the inner wall of the mounting hole 17, and the air vent 18 is connected to the receiver 2. This allows air to be expelled through the air vent 18 when an external power supply is installed through the mounting hole 17 using the dispensing method, further improving the precision and sealing of the wavelength division multiplexing device.

[0063] See Figures 5 to 7 In the wavelength division multiplexing device of this embodiment, the beam splitter 7 has a reflector 19, a light guide 20, and a plurality of filters 21. Along the first direction D1, the light guide 20 has an incident light side 22 and an exit light side 23. The incident light side 22 has an incident light portion 24 and a reflective portion 25. The incident light portion 24 is used to receive a collimated beam L-co. The reflective portion 25 is equipped with the reflector 19. The exit light side 23 is equipped with a plurality of filters 21. The filters 21 are used to simultaneously transmit and reflect light. Each filter 21 outputs an outgoing beam L-out. The wavelength of the outgoing beam L-out output by different filters 21 is different.

[0064] Specifically, the beam splitter 7 consists of three parts: a reflector 19, which is a mirror with reflective function; a light guide 20, which is a glass block with light-conducting function; and multiple filters 21, which are semi-reflective and semi-transparent and can only transmit light of specific wavelengths, as in this embodiment. Figure 5 In the middle, the four filters 21 can only pass light at 1270nm, 1290nm, 1310nm and 1330nm respectively, and all other light is reflected.

[0065] The wavelength division multiplexing device of this embodiment utilizes the characteristic of filter 21 that only transmits light of a specific wavelength to separate light of different wavelengths in the incident light L-in, and then propagates to the receiver 2 through different optical paths to achieve demultiplexing of light, thereby generating different electrical signals in the receiver 2 through photoelectric conversion.

[0066] In the wavelength division multiplexing device of this embodiment, the incident light side 22 and the output light side 23 are parallel to each other, and the spacing between two adjacent filters 21 is the same. The individual light rays reflected by the previous filter 21 in the optical path and transmitted in the optical guide 20 are parallel to each other, and it is also ensured that the incident angle when the light rays are incident on the next filter 21 is the same as the incident angle when the light rays are incident on the previous filter 21. As a result, the multiple output beams L-out emitted from the beam splitter 7 are parallel to each other and are located on the same output plane.

[0067] Using the wavelength division multiplexing device of this embodiment, the outgoing light beams L-out emitted through the filter are projected onto the reflector 8 in parallel with each other. The light spots reflected and converged by the reflector 8 are of uniform size and have the same spacing. The light energy attenuation of each wavelength of light received by the receiver 2 is also basically the same.

[0068] In the wavelength division multiplexing device of this embodiment, the reflecting surface of the reflector 8 is a biconical surface, and the beam splitter 7 and the receiver 2 are located on opposite sides of the optical axis of the reflecting surface. The optical axis is the normal to the reflecting surface of the reflector 8, as shown below. Figure 8 and Figure 9 As shown, the double conical surface of the reflector 8, as a reflecting surface, can focus the outgoing light beam L-out of the corresponding wavelength from a large spot into a small spot and enter the receiver 2, so that the outgoing light beam L-out can be fully received by the receiver 2.

[0069] Specifically, the reflector 8 has two reflective surfaces: a convex mirror 26 protruding towards the receiver 2 (see [link]). Figure 8 and Figure 10 ) or a concave mirror 27 that is recessed in the opposite direction to the receiving surface (see Figure 9 and Figure 11 The convex mirror 26 and the concave mirror 27 achieve the function of deflecting light by changing the direction of light propagation. For example... Figure 8 As shown, when the reflecting surface is a convex mirror 26, the principle of total internal reflection is used to change the propagation direction of the demultiplexed outgoing beam L-out (deflecting it downwards by 90 degrees), while simultaneously achieving a converging function, projecting it onto the photoelectric conversion element 12 below the reflector 8. The convex mirror 26 has a double-conical surface shape, with a radius of curvature of 3.18 mm and a conic coefficient of -32.2 in the X direction, a radius of curvature of 1.68 mm in the Y direction, and a conic coefficient of -7.39 in the Y direction. Figure 9 As shown, when the reflecting surface is a concave mirror 27, its surface is coated with a reflective film layer. Through the reflection of light, the propagation direction of the demultiplexed outgoing beam L-out is changed (deflected downwards by 90 degrees), and at the same time, a converging function is achieved, projecting the light onto the photoelectric conversion element 12 below the reflector 8. The concave mirror 27 has a double-conical surface shape, with a radius of curvature of 1.8 mm and a conic coefficient of -3.6 in the X direction, a radius of curvature of 3.5 mm in the Y direction, and a conic coefficient of -23.3 in the Y direction.

[0070] See Figure 10 and Figure 11In the wavelength division multiplexing device of this embodiment, the reflector 8 includes a plurality of reflecting units 28, which are arranged along a second direction D2, intersecting with a first direction D1. The number of reflecting units 28 is the same as the number of outgoing beams L-out, and each reflecting unit 28 receives one outgoing beam L-out. There is an angle between each reflecting unit 28 and the corresponding received outgoing beam L-out. The multiple outgoing beams L-out form an outgoing plane, and the multiple reflecting units 28 are located on the outgoing plane. The second direction D2 is perpendicular to the first direction D1. The outgoing beams L-out emitted by the beam splitter 7 are all emitted horizontally and propagate vertically downward (i.e., in the third direction D3) into the receiver 2.

[0071] Specifically, in terms of structure, the reflector 8 is made on the third connecting part 5 and is integrally formed with the entire frame 1 by injection molding. During the injection molding process, an array of reflective units 28 is formed on the third connecting part 5 by the mold. These arrayed reflective units 28 together form the reflector 8, which plays the role of turning the light path by 90° and converging the light spot, so as to facilitate the demultiplexing of light by the photoelectric conversion element 12.

[0072] The wavelength division multiplexing device of this embodiment uses each reflection unit 28 to reflect the corresponding wavelength of the outgoing light beam L-out to the corresponding position in the receiver 2, so that each wavelength of outgoing light beam L-out has an independent optical path and does not interfere with each other. The corresponding reflection unit 28 deflects each wavelength of outgoing light beam L-out at a certain angle and transmits it to the photoelectric conversion unit 12 corresponding to each wavelength in the receiver 2. Each photoelectric conversion unit 12 transmits and uses each wavelength of outgoing light beam L-out, thereby achieving the function of demultiplexing the incident light L-in.

[0073] The wavelength division multiplexing (WDM) device of this embodiment is applied in optical communication equipment and includes a frame 1 (molded by injection molding, with a reflector 8 integrally molded on the frame 1), a collimator 6 (integrated into the integrally molded frame 1, which can be directly fixed to the optical fiber of the transmitter 14, or the optical fiber of the transmitter 14 can be connected during use; the transmitter 14 and the collimator 6 are collectively referred to as the fiber collimator 6), a beam splitter 7, a reflector 8, a photoelectric conversion element 12, a circuit board 13, and other components. At the transmitting end of the optical communication equipment, the transmitter 14 converts various service signals entering the optical communication equipment into light signals of different colors, i.e., light signals of different wavelengths. For example, the wavelengths of light incident into the optical fiber are 1270nm, 1290nm, 1310nm, and 1330nm, respectively. These light signals of different wavelengths are combined into a single colored light signal and transmitted on the same optical fiber. The optical fiber from transmitter 14 and the collimated beam L-co (which includes light of multiple wavelengths) from collimator 6 are demultiplexed by beam splitter 7 to form multiple outgoing beams L-out with different wavelengths. Each outgoing beam L-out passes through reflector 8 (for example, it has four reflective units 28, each reflecting a wavelength of light, forming four optical paths) in sequence. Each optical path is turned 90° and becomes converged light from collimated light, which is then converged onto photoelectric converter 12. At the receiving end, receiver 2 performs the opposite operation, restoring the color light signal into light signals of different colors. Then, current is generated through photoelectric converter 12 to realize the conversion of light signal to electrical signal.

[0074] The wavelength division multiplexing device in this embodiment adopts an injection molding process to integrate various components together, and utilizes an integrated reflective curved mirror array to achieve integrated packaging of the wavelength division multiplexing device, which can reduce light attenuation.

[0075] In the wavelength division multiplexing device of this embodiment, the adhesive used for bonding, fixing or connecting components by dispensing is 353ND or other adhesives.

[0076] The wavelength division multiplexing device disclosed in this application integrates components such as collimators, reflectors, and beam splitters into a single frame, simplifying the packaging of each component, reducing production costs, increasing assembly efficiency, and reducing light energy attenuation compared to the original combination of right-angle prisms and focusing lenses.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A wavelength division multiplexing device, characterized in that, include: A frame and a receiver, wherein the receiver is mounted together with the frame; The frame has a first connecting part, a second connecting part, and a third connecting part, which are arranged sequentially along a first direction and integrally formed. The first connecting part is provided with a collimator, the second connecting part is provided with a beam splitter, and the third connecting part is provided with a reflector, the reflector being integrally formed with the third connecting part; The collimator receives the incident light and collimates the incident light to form a collimated beam; the beam splitter receives the collimated beam and splits the collimated beam into multiple outgoing beams with different wavelengths; the reflector receives the multiple outgoing beams and reflects and converges the multiple outgoing beams to the receiver. The first connecting part has a mounting hole that extends along the first direction. The collimator has a light-incident surface in the first direction. The mounting hole is located at the light-incident surface of the collimator. An external transmitter is connected to the light-incident surface of the collimator through the mounting hole. An air hole is formed on the inner wall of the mounting hole and is connected to the receiver. The reflector's reflective surface is a double-conical surface, and the beam splitter and the receiver are located on opposite sides of the optical axis of the reflective surface; The receiver has a connection surface that is parallel to the first direction and faces the frame. The first connecting part and the third connecting part are respectively connected to the connecting surface. The second connecting part is spaced from the connecting surface. A limiting groove is provided on the surface of the second connecting part facing the connecting surface. The beam splitter is fixed in the limiting groove.

2. The wavelength division multiplexing device according to claim 1, characterized in that, The collimator is integrally formed on the first connecting part, and the collimator has a collimating surface in the first direction, the collimating surface facing the beam splitter; the incident light enters the collimator from the incident surface, is collimated by the collimating surface to form a collimated beam, and is then projected onto the beam splitter.

3. The wavelength division multiplexing device according to claim 2, characterized in that, The light-incident surface of the collimator is the bottom of the mounting hole near the second connecting part along the first direction, and the axis of the mounting hole and the optical axis of the light-incident surface are on the same straight line.

4. The wavelength division multiplexing device according to claim 1, characterized in that, The receiver includes a photoelectric converter and a circuit board, the connection surface is the surface of the circuit board facing the frame, and the photoelectric converter is mounted on the connection surface; The circuit board is connected to the first connecting part and the third connecting part through the connecting surface; The photoelectric conversion element is located at the light outlet of the reflector.

5. The wavelength division multiplexing device according to claim 4, characterized in that, The first connecting part and the third connecting part are respectively fixed to the connecting surface by dispensing adhesive.

6. The wavelength division multiplexing device according to claim 1, characterized in that, The reflective surface is a convex mirror that protrudes toward the receiver or a concave mirror that is recessed in the opposite direction to the receiver.

7. The wavelength division multiplexing device according to claim 1, characterized in that, The reflector includes a plurality of reflective elements arranged along a second direction, which intersects with the first direction; The number of the reflecting units is the same as the number of the emitted light beams, and each reflecting unit receives one emitted light beam. Each of the reflecting units has an angle with the corresponding received outgoing beam.

8. The wavelength division multiplexing device according to claim 7, characterized in that, The multiple emitted beams form an emission plane, and the multiple reflecting units are located on the emission plane. The second direction is perpendicular to the first direction.

9. The wavelength division multiplexing device according to claim 1, characterized in that, The beam splitter has a reflector, a light guide, and multiple filters; Along the first direction, the light guide has an incident light side and an exit light side. The incident light side has an incident light portion and a reflective light portion. The incident light portion is used to receive the collimated beam. The reflective light portion is equipped with the reflector. The exit light side is equipped with the plurality of filters. The filters are used to simultaneously transmit and reflect light. Each of the filters outputs a beam of light, and the wavelengths of the beams output by different filters are different.

10. The wavelength division multiplexing device according to claim 9, characterized in that, The light-incident side and the light-outcident side are parallel to each other, and the spacing between two adjacent filters is the same.

11. An optical converter, characterized in that, It includes a transmitter and a wavelength division multiplexing device as described in any one of claims 1 to 10, wherein the transmitter is docked with the collimator of the wavelength division multiplexing device.

12. An optical communication device, characterized in that, It includes a signal transceiver and an optical converter as described in claim 11, wherein the optical converter is connected to the signal transceiver.

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