Wavelength division multiplexer

Abstract

The utility model provides a wavelength division multiplexer. The wavelength division multiplexer comprises a multiplexer optical path board, a plurality of optical filters and a plurality of lens optical fibers, the plurality of optical filters are arranged on the multiplexer optical path board to form a preset optical path, and the filtering wavelengths of the optical filters are different; the preset light path is provided with a light combining end which is at least used for being connected with a light combining optical fiber; the plurality of lens optical fibers are arranged corresponding to the plurality of optical filters; the lens fiber comprises a main body and a convex transparent part; the main body is at least connected with the light splitting fiber; the convex transparent part is arranged on the main body and protrudes towards the corresponding optical filter. The wavelength division multiplexer is simple in structure, the manufacturing process difficulty of the wavelength division multiplexer is reduced, the production efficiency of the wavelength division multiplexer is improved, and the production cycle of the wavelength division multiplexer is shortened.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber communication, and in particular to a wavelength division multiplexer. BACKGROUND

[0002] The wavelength division multiplexer is an important device for optical fiber communication system, which can combine different wavelength optical signals into the same optical fiber for transmission, and can separate different wavelength optical signals in the same optical fiber.

[0003] The wavelength division multiplexer includes a multiplexer optical path board, a plurality of optical filters, and a plurality of collimators. When the wavelength division multiplexer is used as a demultiplexer, different wavelength optical signals in the multiplexer optical path board can be transmitted to the corresponding collimator through the plurality of optical filters, and then transmitted to the optical fiber through the collimator, thereby realizing the separation of different wavelength optical signals. When the wavelength division multiplexer is used as a multiplexer, different wavelength optical signals from the plurality of collimators can be transmitted to the multiplexer optical path board through the optical filters, thereby realizing the combination of different wavelength optical signals through the multiplexer optical path board.

[0004] However, the structure of the wavelength division multiplexer is complex, and the preparation process of the wavelength division multiplexer is troublesome. CONTENT OF THE UTILITY MODEL

[0005] The wavelength division multiplexer provided by the embodiments of the present application solves the problem of complex structure of the wavelength division multiplexer and the problem of troublesome preparation process of the wavelength division multiplexer.

[0006] In order to achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions:

[0007] The wavelength division multiplexer provided by the embodiments of the present application solves the problem of complex structure of the wavelength division multiplexer and the problem of troublesome preparation process of the wavelength division multiplexer.

[0008] The plurality of optical filters are arranged on the multiplexer optical path board to form a preset optical path, and the filter wavelengths of the optical filters are different; the preset optical path has a light combining end, and the light combining end is used at least for connecting with a light combining optical fiber;

[0009] The plurality of lens optical fibers are arranged correspondingly with the plurality of optical filters; the lens optical fiber includes a main body and a convex lens part, and the main body is used at least for connecting with a light splitting optical fiber; the convex lens part is arranged on the main body, and the convex lens part is arranged protruding towards the corresponding optical filter.

[0010] In some embodiments of the present application, the optical filter includes a plurality of first optical filters and a plurality of second optical filters, the first optical filter is arranged on the same side of the light combining end, and the second optical filter is arranged on the opposite side of the light combining end.

[0011] The plurality of lens optical fibers include a plurality of first lens optical fibers and a plurality of second lens optical fibers; the plurality of first lens optical fibers are arranged correspondingly with the plurality of first optical filters, and the plurality of second lens optical fibers are arranged correspondingly with the plurality of second optical filters.

[0012] In some embodiments of the present application, the wavelength division multiplexer comprises a first fixing member, the first fixing member fixing the plurality of first lens fibers;

[0013] The wavelength division multiplexer comprises a second fixing member, the second fixing member fixing the plurality of second lens fibers.

[0014] In some embodiments of the present application, the wavelength division multiplexer comprises a substrate;

[0015] The plurality of first filters are spaced apart, and the plurality of first lens fibers are spaced apart on the first fixing member;

[0016] The first fixing member is fixed to the multiplexer optical path plate through the substrate, and the convex lens part of the first lens fiber faces the corresponding first filter;

[0017] The plurality of second filters are spaced apart, and the plurality of second lens fibers are spaced apart on the first fixing member;

[0018] The second fixing member is fixed to the multiplexer optical path plate through the substrate, and the convex lens part of the second lens fiber faces the corresponding second filter.

[0019] In some embodiments of the present application, the first fixing member is provided with a plurality of first fixing grooves, and the plurality of first fixing grooves are spaced apart;

[0020] The first fixing member accommodates the plurality of first lens fibers through the plurality of first fixing grooves, and the main body of the first lens fiber is arranged in the first fixing groove.

[0021] In some embodiments of the present application, the second fixing member is provided with a plurality of second fixing grooves, and the plurality of second fixing grooves are spaced apart;

[0022] The second fixing member accommodates the plurality of second lens fibers through the plurality of second fixing grooves, and the main body of the second lens fiber is arranged in the second fixing groove.

[0023] In some embodiments of the present application, the first fixing member is provided with a first adhesive layer, and the first fixing member connects the plurality of first lens fibers through the first adhesive layer;

[0024] The second fixing member is provided with a second adhesive layer, and the second fixing member connects the plurality of second lens fibers through the second adhesive layer.

[0025] In some embodiments of the present application, the wavelength division multiplexer further comprises a third fixing member, the third fixing member being fixedly connected with the multiplexer optical path plate, and the third fixing member being used for fixing at least a combining fiber.

[0026] In some embodiments of the present application, the lens fiber is used to form a splitting fiber, and the main body is integrally arranged with the splitting fiber.

[0027] In some embodiments of the present application, the convex lens portion is a non-spherical convex lens portion.

[0028] The wavelength division multiplexer provided by the embodiments of the present application includes a multiplexer optical path board, a plurality of optical filters and a plurality of lens fibers. The plurality of optical filters are arranged on the multiplexer optical path board to form a preset optical path, the filtering wavelengths of the optical filters are different, so that optical signals of specific wavelengths pass through. The preset optical path has a light combining end, which is used to be connected with a light combining fiber at least. The plurality of lens fibers are arranged correspondingly with the plurality of optical filters. The lens fiber includes a main body and a convex lens portion, and the main body is used to be connected with a light splitting fiber at least. The convex lens portion is arranged on the main body, and the convex lens portion is arranged protruding towards the corresponding optical filter.

[0029] When the wavelength division multiplexer is used as a light splitter, a composite signal is transmitted from the light combining end to the lens fiber, the lens fiber converts the composite signal into a composite light beam, and the composite light beam is transmitted along the preset optical path in the multiplexer optical path board. In the transmission process of the composite light beam, optical signals of specific wavelengths are transmitted from the corresponding optical filter, and optical signals of other wavelengths are reflected on the optical filter. In this way, optical signals of different wavelengths are sequentially transmitted from a plurality of corresponding optical filters, and then the transmitted optical signals are coupled into the light splitting fiber through the lens fiber, so that a plurality of optical signals of different wavelengths are separated.

[0030] When the wavelength division multiplexer is used as a light combiner, optical signals of different wavelengths are emitted from a plurality of different devices, and the optical signals are transmitted to the lens fiber through the light splitting fiber respectively, and the lens fiber converts the optical signals into light beams. The light beams of specific wavelengths pass through the optical filters of corresponding wavelengths, enter the multiplexer optical path board, and are transmitted along the preset optical path of the multiplexer optical path board. The light beams of other wavelengths transmitted along the preset optical path are reflected on the optical filters and continue to propagate along the preset optical path. A plurality of light beams converge to form a light combining end in the preset optical path, and the light combining end is transmitted to the light combining fiber.

[0031] The lens fiber can be directly processed by an optical fiber, and the structure is relatively simple, so that the structure of the wavelength division multiplexer is simple, which reduces the manufacturing process difficulty of the wavelength division multiplexer and improves the production efficiency of the wavelength division multiplexer. The wavelength division multiplexer includes a first fixing member and a second fixing member, and the first fixing member and the second fixing member can fix a plurality of first lens fibers and a plurality of second lens fibers respectively. In this way, the plurality of lens fibers can be fixed at one time, and the production cycle of the wavelength division multiplexer is shortened. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application.

[0033] Figure 1 FIG. 1 is a structural schematic diagram of a wavelength division multiplexer in the related art;

[0034] Figure 2 A structure diagram of a collimator in the related art;

[0035] Figure 3 A structure diagram of a wavelength division multiplexer as a wave splitter provided by an embodiment of the present application;

[0036] Figure 4 A structure diagram of a lens fiber provided by an embodiment of the present application;

[0037] Figure 5 A structure diagram of a wavelength division multiplexer as a wave combiner provided by an embodiment of the present application;

[0038] Figure 6 A structure diagram of a first fixing member provided by an embodiment of the present application.

[0039] Reference signs:

[0040] 10 - wavelength division multiplexer;

[0041] 11 - multiplexer optical path board;

[0042] 12 - filter; 121 - first filter; 122 - second filter;

[0043] 13 - lens fiber;

[0044] 13a - main body; 13b - convex lens part; 131 - first lens fiber; 132 - second lens fiber; 133 - light combining fiber; 134 - light splitting fiber;

[0045] 141 - first fixing member; 142 - second fixing member; 143 - third fixing member; 1411 - first fixing groove; 1421 - second fixing groove;

[0046] 15 - collimator;

[0047] 151 - optical fiber; 152 - capillary; 153 - lens; 154 - sleeve;

[0048] 16 - substrate;

[0049] L - preset optical path; L1 - light combining end. DETAILED DESCRIPTION

[0050] In the related art, with the continuous development of communication technology in the digital era, a wavelength division multiplexer (WDM) is widely used in various communication networks to provide users with efficient, reliable, and flexible data transmission services.

[0051] The wavelength division multiplexer can serve as a combiner and a demultiplexer. When serving as a combiner, the wavelength division multiplexer can combine optical signals of different wavelengths from different sending ends into a composite signal for transmission through a single optical fiber. When serving as a demultiplexer, the wavelength division multiplexer can separate optical signals of different wavelengths in the composite signal and transmit the optical signals of different wavelengths to different receiving devices, respectively.

[0052] Referring to Figure 1 As shown in FIG. 1, the wavelength division multiplexer 10 includes a multiplexer optical path board 11, a plurality of collimators 15, and a plurality of optical filters 12. The optical filters 12 allow only optical signals of a specific wavelength to pass through and reflect optical signals of other wavelengths. The plurality of optical filters 12 includes a plurality of first optical filters 121 and a plurality of second optical filters 122. For ease of description, the right side and the left side of the multiplexer optical path board 11 are defined as a first side and a second side of the multiplexer optical path board 11, respectively. The plurality of first optical filters 121 are disposed on the first side of the multiplexer optical path board 11, and the plurality of second optical filters 122 are disposed on the second side of the multiplexer optical path board 11. The plurality of first optical filters 121 and the plurality of second optical filters 122 are alternately disposed on the two sides of the multiplexer optical path board 11 to achieve multi-stage filtering. The plurality of collimators 15 are disposed in correspondence with the plurality of optical filters 12, respectively.

[0053] Referring to Figure 2 As shown in FIG. 1, the collimator 15 can convert optical signals transmitted through an optical fiber into a light beam to reduce loss of the optical signals during transmission. The collimator 15 is also used to couple the light beam into an optical fiber, which can improve transmission efficiency of the optical signals.

[0054] The collimator 15 can include an optical fiber 151, a capillary tube 152, a lens 153, and a sleeve 154. The optical signals are transmitted in the optical fiber 151. The capillary tube 152 is sleeved on the optical fiber 151 to ensure stability and accuracy of the position of the end face of the optical fiber 151. The lens 153 is disposed in correspondence with the optical fiber 151 and can convert divergent optical signals into a light beam or couple the light beam into the optical fiber 151. The sleeve 154 is used to fix the optical fiber 151 and the lens 153 to ensure accurate alignment between the optical fiber 151 and the lens 153.

[0055] Referring to Figure 1As shown, the wavelength division multiplexer 10 is described by taking the separation process of the optical signals as an example. The combined optical signals are transmitted along the optical fiber 151 to the collimator 15 and then to the multiplexer optical path board 11 of the wavelength division multiplexer 10. The collimator 15 converts the incident optical signals into beams. The beams are incident on the second filter 122 on the second side of the multiplexer optical path board 11. Then, the second filter 122 allows the optical signals of a specific wavelength (e.g., λ1) to pass through, and reflects the optical signals of other wavelengths (e.g., λ2, λ3, λ4, λ5, λ6, etc.). The optical signals (λ1) passing through the second filter 122 are transmitted in a straight line to the collimator 15. The collimator 15 couples the optical signals (λ1) from the beams into the optical fiber 151 and then to the receiving device. The reflected optical signals (e.g., λ2, λ3, λ4, λ5, λ6, etc.) are guided to the first filter 121 on the first side of the multiplexer optical path board 11. The reflected optical signals (e.g., λ2) reach the first filter 121. The first filter 121 only allows the optical signals (λ2) to pass through, and reflects other wavelengths (e.g., λ3, λ4, λ5, λ6, etc.). The optical signals (λ2) passing through the first filter 121 are transmitted in a straight line. The collimator 15 couples the optical signals (λ2) from the beams into the optical fiber 151 and then to the receiving device.

[0056] The wavelength division multiplexer 10 separates the signals of different wavelengths (e.g., λ1, λ2, λ3, λ4, λ5, λ6, etc.) in sequence by being arranged in this way.

[0057] It is easy to understand that the multiple collimators 15 need to be aligned with the optical signals to achieve the accuracy of signal reception. Therefore, the collimators 15 have high position accuracy requirements, which leads to complex manufacturing processes. In addition, the collimator 15 is composed of the optical fiber 151, the capillary tube 152, the lens 153, and the sleeve 154. The structure of the collimator 15 is complex, which leads to a complex structure of the wavelength division multiplexer 10.

[0058] Therefore, the wavelength division multiplexer provided by the embodiments of the present application includes a multiplexer optical path board, multiple filters, and multiple lens fibers. The multiple filters are arranged on the multiplexer optical path board to form a preset optical path. The filters have different filtering wavelengths to allow the optical signals of specific wavelengths to pass through. The preset optical path has a light combining end, which is used to connect with a light combining fiber at least. The multiple lens fibers are arranged correspondingly to the multiple filters. The lens fiber includes a main body and a convex lens part. The main body is used to connect with a light splitting fiber at least. The convex lens part is arranged on the main body and protrudes towards the corresponding filter.

[0059] As a demultiplexer, the composite signal is transmitted from the combining end to the lens fiber, the lens fiber converts the composite signal into a composite light beam, and the composite light beam is transmitted along a preset optical path in the multiplexer optical path board. In the transmission process, the light signal of a specific wavelength is transmitted from the corresponding filter, and the light signal of other wavelengths is reflected on the filter. In this way, the light signals of different wavelengths are sequentially transmitted from a plurality of corresponding filters, and then the transmitted light signals are coupled into the splitting fiber through the lens fiber, so that the light signals of a plurality of different wavelengths are separated.

[0060] As a multiplexer, light signals of different wavelengths are emitted from a plurality of different devices, the light signals are transmitted to the lens fiber through the splitting fiber, and the lens fiber converts the light signals into light beams. The light beam of a specific wavelength passes through the corresponding wavelength filter, enters the multiplexer optical path board, and is transmitted along a preset optical path in the multiplexer optical path board. The light beams of other wavelengths transmitted along the preset optical path are reflected on the filter and continue to propagate along the preset optical path. A plurality of light beams converge to form a combining end in the preset optical path, and are transmitted to the combining fiber from the combining end.

[0061] The lens fiber can be directly processed by the optical fiber, and the structure is relatively simple, so that the structure of the wavelength division multiplexer is simple, thereby reducing the manufacturing process difficulty of the wavelength division multiplexer and improving the production efficiency of the wavelength division multiplexer.

[0062] The wavelength division multiplexer includes a first fixing member and a second fixing member, and the first fixing member and the second fixing member can fix a plurality of first lens fibers and a plurality of second lens fibers respectively. In this way, the plurality of lens fibers can be fixed at one time, and the production cycle of the wavelength division multiplexer is shortened.

[0063] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. In the following description, the same reference numerals are used to denote the same elements in different drawings, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0064] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0065] Reference Figure 3As shown, the embodiments of the present application provide a wavelength division multiplexer 10, which is used for optical fiber communication. The wavelength division multiplexer 10 can combine multiple optical signals of different wavelengths into one optical fiber for transmission, or separate the multiple wavelength optical signals in one optical fiber into individual optical signals. The wavelength division multiplexer 10 can improve the capacity and efficiency of the optical fiber communication system.

[0066] The wavelength division multiplexer 10 can be used as a combiner and a demultiplexer, which are different applications of the wavelength division multiplexer 10.

[0067] The combiner is mainly to combine multiple optical signals of different wavelengths into one composite signal, and then transmit it to the same optical fiber. The demultiplexer is mainly to separate each wavelength in the composite signal transmitted by the optical fiber at the receiving end, and then transmit it to different receiving devices for processing.

[0068] For example, the wavelength division multiplexer 10 can be set as a compact wavelength division multiplexer. The compact wavelength division multiplexer has a small package size, which can be applied to high-density environments. The compact wavelength division multiplexer is used in data centers, metropolitan area network core nodes and other environments.

[0069] Referring to Figure 3 As shown, the wavelength division multiplexer 10 includes a multiplexer optical path board 11, a plurality of optical filters 12 and a plurality of lens fibers 13. Among them, the multiplexer optical path board 11 is used to install optical elements. For example, the optical filter 12 can be installed on the multiplexer optical path board 11, and the lens fiber 13 can receive the optical signal separated by the optical filter 12. The multiplexer optical path board 11 can improve the stability of the wavelength division multiplexer 10, and ensure the stability and accuracy of the optical signal.

[0070] The multiplexer optical path board 11 can be designed according to the application scenario or packaging requirements of the wavelength division multiplexer 10. For example, the multiplexer optical path board 11 can be set as a flat plate, so as to facilitate the installation of optical elements on the multiplexer optical path board 11.

[0071] The material of the multiplexer optical path board 11 can be selected to have good mechanical strength, thermal stability and optical performance.

[0072] For example, the material of the multiplexer optical path board 11 can be selected as glass material. In this way, the loss of the multiplexer optical path board 11 in transmitting optical signals is low, and the multiplexer optical path board 11 can be set as a solid structure. The glass material generally has good optical transparency and thermal stability, which ensures the long-term stable operation of the wavelength division multiplexer 10.

[0073] For example, the multiplexer optical path board 11 can be made of metal or ceramic. In order to ensure the transmission of optical signals, the multiplexer optical path board 11 can be provided with a hollow structure. These materials have good stability, which is conducive to the long-term stable operation of the wavelength division multiplexer 10.

[0074] The wavelength division multiplexer 10 can include a plurality of optical filters 12 fixed on the side of the multiplexer optical path board 11. The optical filters 12 can transmit optical signals of a specific wavelength and reflect optical signals of other wavelengths. For example, the side wall of the multiplexer optical path board 11 can be coated with glue or other adhesives to fix the optical filters 12.

[0075] The plurality of optical filters 12 can filter optical signals of different wavelengths. From the composite signal transmitted to the optical filters 12 on the multiplexer optical path board, the optical signals of a specific wavelength will be transmitted into the optical filters 12, and the optical signals of other wavelengths will be reflected at the incident end of the optical filters 12, so as to separate and combine the optical signals of different wavelengths.

[0076] In some embodiments of the present application, the optical filters 12 are thin film filters (TFF). The thin film filter uses optical interference effect to selectively transmit optical signals of a specific wavelength and reflect optical signals of other wavelengths.

[0077] In some embodiments of the present application, the material of the optical filters 12 can be glass. Glass has good optical performance and stability. By doping specific light-absorbing substances or coating films in the glass, the transmission and reflection characteristics of the optical filters 12 to optical signals can be controlled.

[0078] The optical filters 12 can be made in the form of a multilayer dielectric film. A plurality of dielectric films with different refractive indices are alternately stacked on the glass to form the optical filters 12. By precisely controlling the thickness and refractive index of each layer of dielectric film, highly selective transmission or reflection of optical signal wavelength can be achieved.

[0079] The side wall of the multiplexer optical path board 11 is fixed with a plurality of optical filters 12. After the optical signals of a specific wavelength in the composite signal are incident into the multiplexer optical path board 11, they will be transmitted into the optical filters 12, and the optical signals of other wavelengths will be reflected at the optical filters 12. By analogy, the optical signals of different wavelengths will form a path in the multiplexer optical path board 11 after being reflected multiple times by the plurality of optical filters 12 on the multiplexer optical path board 11. This path is a preset optical path L (for example, the arrow indicates the path). Figure 3 The preset optical path ensures that the transmission path of the optical signals is fixed, reducing the loss and interference of the optical signals in the transmission process.

[0080] The preset light path L has a light combining end L1, for example, combining multiple wavelength optical signals into a composite signal, and the light combining end L1 is the transmitting end or receiving end of the composite signal. For example, when the light combining end L1 is the transmitting end of the composite signal, the path of the preset light path L can be adjusted by adjusting the incident angle of the composite signal on the first filter 12.

[0081] In some embodiments of the present application, the lens fiber 13 in the wavelength division multiplexer 10 is a fiber with a certain length. For example, the wavelength division multiplexer 10 is provided with a first fixing member 141 for fixing the lens fiber 13. The lens fiber 13 is a section of fiber located on the first fixing member 141.

[0082] The fiber transmitting the composite signal is defined as a light combining fiber 133, and the fiber transmitting the optical signal of a specific wavelength is defined as a light splitting fiber 134. The light combining end L1 is used to connect with the light combining fiber 133 and transmit the composite signal through the light combining fiber 133. The light combining fiber 133 is connected with the device end receiving or transmitting the composite signal, and the light splitting fiber 134 is connected with the device end receiving or transmitting the optical signal of a specific wavelength. For example, the composite signal transmitted by the device end is transmitted through the light combining fiber 133. The light combining fiber 133 is connected with the lens fiber 13 in the wavelength division multiplexer 10 through a connector to realize signal transmission. Then, the composite signal is transmitted to the lens fiber 13.

[0083] In some embodiments of the present application, the lens fiber 13 is reused to form the light splitting fiber 134, and the main body 13a is integrally arranged with the light splitting fiber 134. That is, the lens fiber 13 and the light splitting fiber 134 can be formed by one fiber. In this way, the lens fiber 13 of the wavelength division multiplexer 10 can be directly connected with the device end, which reduces the connection points on the optical signal transmission path and reduces the failure rate of optical signal transmission.

[0084] In some other embodiments of the present application, the lens fiber 13 is reused to form the light combining fiber 133, and the main body 13a is integrally arranged with the light combining fiber 133. That is, the lens fiber 13 and the light combining fiber 133 can be made of one fiber. In this way, the lens fiber 13 can be directly connected with the device end (for example, a combiner), which reduces the connection points on the optical signal transmission path and reduces the failure rate of optical signal transmission.

[0085] The wavelength division multiplexer 10 further includes a plurality of lens fibers 13, which are used to convert the optical signals emitted by the fiber into a light beam, reducing the loss of optical signals in the transmission process. The lens fiber 13 is also used to couple the light beam into the fiber, which can improve the transmission efficiency of the optical signal. The plurality of lens fibers 13 are arranged corresponding to the plurality of filters 12, ensuring that each lens fiber 13 can couple the optical signal to the corresponding filter 12, improving the coupling efficiency of the system.

[0086] Referring to Figure 4 As shown, specifically, the lens fiber 13 includes a main body 13a and a convex lens part 13b. The main body 13a is used to transmit optical signals, and the main body 13a is connected with the splitter fiber 134 so that the optical signals are communicated with each device through the splitter fiber 134.

[0087] The convex lens part 13b is arranged on the main body 13a, and the convex lens part 13b is arranged protruding towards the corresponding filter 12. The convex lens part 13b can be arranged at a certain distance from the filter 12. The convex lens part 13b can convert the optical signals transmitted in the main body 13a into a light beam, and the light beam can be incident into the corresponding filter 12. Alternatively, the light beam is incident into the corresponding convex lens part 13b from the filter 12, and the light beam is coupled into the main body 13b through the convex lens part 13b.

[0088] For example, the convex surface of the filter 12 towards which the convex lens part 13b is arranged is coated. The coating can reduce the reflection of the surface of the convex lens part 13b, and improve the transmittance of the optical signals. The coating can also prevent the surface of the convex lens part 13b from being damaged by environmental factors (such as moisture and chemicals), thereby prolonging the service life of the lens fiber 13.

[0089] In some embodiments of the present application, the main body 13a can be a fiber material. The convex lens part 13b is machined on the end face of the fiber to form the lens fiber 13, so that the machining precision is high and the machining efficiency is high.

[0090] The collimator 15 is usually composed of several parts, including a fiber 151, a capillary tube 152, a lens 153, and a sleeve 154. The structure of the wavelength division multiplexer 10 using the collimator 15 is relatively complex. The lens fiber 13 can be integrally machined by using a fiber, and the structure is relatively simple. Therefore, the number of parts and the assembly steps of the wavelength division multiplexer 10 using the lens fiber 13 are reduced, and the manufacturing process difficulty and the processing cost of the wavelength division multiplexer 10 are reduced.

[0091] In some embodiments of the present application, the convex lens part 13b is arranged as an aspheric convex lens part 13b. The surface curvature of the aspheric convex lens part 13b is not a spherical surface or a cylindrical surface, but a complex curved surface designed according to requirements. For example, by changing the curvature of the convex lens part 13b of the lens fiber 13, the size of the light spot coupled into the main body 13a can be adjusted. Adjusting the aspheric convex lens part 13b can control the size of the light spot, thereby improving the transmission efficiency and coupling efficiency of the optical signals.

[0092] For example, the greater the curvature of the aspheric convex lens part 13b, the smaller the light spot. The smaller the curvature of the aspheric convex lens part 13b, the larger the light spot. By accurately adjusting the curvature of the aspheric convex lens part 13b, the size of the light spot can be adapted to the transmission requirements of high-power optical signals, and the aspheric convex lens part 13b can be prevented from overheating or being damaged, thereby improving the stability and service life of the wavelength division multiplexer 10.

[0093] Referring to Figure 3 The working process of the wavelength division multiplexer 10 as a demultiplexer is described below.

[0094] First, the composite signal is transmitted to the lens fiber 13 of the wavelength division multiplexer 10 through the combining fiber 133. The composite signal is converted into a composite light beam by the lens fiber 13. The composite light beam is incident on the multiplexer optical path board 11 through the combining end L1.

[0095] Then, the composite light beam is irradiated onto the first filter 12, and the light beam of a specific wavelength penetrates through the corresponding filter 12, and the light beams of the remaining wavelengths are reflected along the preset path to the other filters 12. Next, each filter 12 transmits the light beam of a different wavelength. These light beams of different wavelengths are coupled to the main body 13a of the lens fiber 13 through the convex lens portion 13b.

[0096] Finally, the light signals are output to the respective devices through the splitting fiber 134 connected to the main body 13a of the lens fiber 13, and the separation of the light signals is completed.

[0097] Referring to Figure 5 The working process of the wavelength division multiplexer 10 as a multiplexer is described below.

[0098] First, the light signals of different wavelengths are emitted by different devices, for example, the devices can be lasers, optical transceivers, optical amplifiers, optical modulators, etc. The light signals of different wavelengths are transmitted through the splitting fiber 134 respectively, transmitted to the main body 13a of the lens fiber 13, and transmitted to the convex lens portion 13b of the lens fiber through the main body 13a of the lens fiber 13.

[0099] Then, the light signals are converted into light beams through the convex lens portion 13b. The light beams penetrate through the corresponding filters 12 and enter the multiplexer optical path board 11, are reflected by the multiple filters 12 on the multiplexer optical path board 11 and transmitted along the preset optical path L. The light signals of different wavelengths pass through different lens fibers 13 and corresponding filters 12, and all the light signals are transmitted along the preset optical path L. Therefore, all the light signals converge along the preset optical path L and form a composite signal. The composite signal is transmitted to the last filter 12 to form the combining end L1.

[0100] Finally, the composite signal of the combining end L1 is coupled to the combining fiber 133 connected thereto through the lens fiber 13, and the light signals are transmitted to the desired target position through the combining fiber 133.

[0101] The structure and function of each part of the wavelength division multiplexer 10 as a demultiplexer are described below.

[0102] Referring to Figure 3 orFigure 5 As shown, the filter 12 includes a plurality of first filters 121 and a plurality of second filters 122, the first filters 121 are disposed on the same side of the light combining end L1, and the second filters 122 are disposed on the opposite side of the light combining end L1. The plurality of first filters 121 and the plurality of second filters 122 are disposed on both sides of the multiplexer optical path board 11 and are staggered.

[0103] The optical signals are injected into the multiplexer optical path board 11 from the light combining end L1, first injected into the first filter 121 on the multiplexer optical path board 11, the first filter 121 separates the optical signals of a specific wavelength, and the optical signals of the remaining wavelengths are reflected to the second filter 122 on the multiplexer optical path board 11, the second filter 122 separates the optical signals of another specific wavelength, and the optical signals of the remaining wavelengths are reflected by the second filter 122, and so on. The optical signals of different wavelengths are separated out.

[0104] Such arrangement makes the optical signals complete multiple reflections and transmissions, and a "Z" type preset light path L can be formed inside the multiplexer optical path board 11. In this way, the overall volume of the wavelength division multiplexer 10 can be reduced. In this way, the integration of the wavelength division multiplexer 10 is improved.

[0105] The plurality of lens fibers 13 includes a plurality of first lens fibers 131 and a plurality of second lens fibers 132, the plurality of first lens fibers 131 are correspondingly arranged with the plurality of first filters 121, and the plurality of second lens fibers 132 are correspondingly arranged with the plurality of second filters 122. These lens fibers 13 are aligned and fixed to the filter 12 on the multiplexer optical path board 11 to ensure that the optical signals transmitted by the filter 12 can be aligned and received by the lens fibers.

[0106] The wavelength division multiplexer includes a first fixing member 141, the first fixing member 141 fixes the plurality of first lens fibers 131, and the first fixing member 141 provides support for the plurality of first lens fibers 131, ensures the position accuracy of the plurality of first lens fibers 131, thereby ensuring the stability of the transmission path of the optical signals and reducing the loss and error of the optical signals.

[0107] For example, the material of the first fixing member 141 can be glass, which can reduce the stress and displacement of the lens fibers 13 caused by the mismatch of thermal expansion when the temperature changes.

[0108] For another example, the material of the first fixing member 141 can be Kovar material, which can maintain the stability of the lens fibers 13 when the temperature changes, and reduce the influence on the transmission of the optical signals.

[0109] Similarly, the wavelength division multiplexer 10 comprises a second fixing member 142, which fixes the plurality of second lens fibers 132. The second fixing member 142 provides support for the plurality of second lens fibers 132, ensures the accurate position of the plurality of second lens fibers 132, and thus guarantees the stability of the transmission path of the optical signals and reduces the loss and error of the optical signals.

[0110] For example, the material of the second fixing member 142 can be glass, which can reduce the stress and displacement of the lens fibers 13 caused by the mismatch of thermal expansion when the temperature changes.

[0111] For another example, the material of the second fixing member 142 can be Kovar, which can maintain the stability of the lens fibers 13 when the temperature changes and reduce the impact on the transmission of the optical signals.

[0112] The wavelength division multiplexer 10 can achieve one-time fixing of the plurality of lens fibers 13 by setting the first fixing member 141 and the second fixing member 142, which improves the manufacturing precision of the wavelength division multiplexer 10 and shortens the production cycle of the wavelength division multiplexer 10.

[0113] The first fixing member 141 is provided with a first adhesive layer, and the first fixing member 141 connects the plurality of first lens fibers 131 through the first adhesive layer. The first adhesive layer is used to connect and fix the plurality of first lens fibers 131, which improves the firmness of the plurality of first lens fibers 131. In this way, the adhesive is applied to the appropriate position of the first fixing member 141, and the adhesive layer is cured, which is simple to operate and reduces the requirement for the technical level of the operator. This also simplifies the manufacturing process of the wavelength division multiplexer 10, reduces the processing time and cost, and improves the production efficiency.

[0114] The second fixing member 142 is provided with a second adhesive layer, and the second fixing member 142 connects the plurality of second lens fibers 132 through the second adhesive layer. The second adhesive layer is used to connect and fix the plurality of second lens fibers 132, which improves the firmness of the plurality of second lens fibers 132. In this way, the appropriate adhesive is applied to the appropriate position of the second fixing member 142, and the adhesive layer is cured, which is simple to operate and reduces the requirement for the technical level of the operator. This also simplifies the manufacturing process of the wavelength division multiplexer 10, reduces the processing time and cost, and improves the production efficiency.

[0115] For example, the power of each optical signal is tested by an optical path coupling debugging machine, and the position of the lens fibers 13 is adjusted. After the plurality of first lens fibers 131 are determined, the first fixing member 141 is glued and cured. The first fixing member 141 can fix the plurality of first lens fibers 131 at one time, which improves the optical path coupling efficiency and simplifies the production process of the wavelength division multiplexer 10.

[0116] The first plurality of filters 121 are spaced apart. That is, there is a certain distance between two adjacent first filters 121. The first plurality of lens fibers 131 are correspondingly spaced apart on the first fixing member 141, and the spacing of the first plurality of filters 121 can reduce the mutual interference between light signals of different wavelengths and improve the accuracy and stability of the separation of light signals of different wavelengths.

[0117] With reference back to Figure 3 Or Figure 5 As shown, the wavelength division multiplexer 10 includes a substrate 16 for fixing parts of the wavelength division multiplexer 10. The first fixing member 141, the second fixing member 142, and the multiplexer optical path plate 11 can be fixed on the substrate 16. In this way, the first fixing member 141 or the second fixing member 142 is prevented from moving relative to the multiplexer optical path plate 11, and the stable transmission of the optical signals of the wavelength division multiplexer 10 is facilitated.

[0118] For example, the substrate 16 can be made of glass, which has good mechanical strength and thermal stability. In this way, the wavelength division multiplexer 10 is relatively stable during use.

[0119] For example, the substrate 16 can be made of resin material, which has a relatively low cost and can provide a relatively large mechanical strength.

[0120] The first fixing member 141 and the multiplexer optical path plate 11 are fixed on the substrate 16, and the first fixing member 141 is correspondingly fixed with the multiplexer optical path plate 11. That is, the first fixing member 141 can be arranged at a corresponding position of the multiplexer optical path plate 11 and can be fixed relative to the multiplexer optical path plate 11, so as to ensure the stability of the transmission path of the optical signals. The convex lens portion 13b of the first lens fiber 131 faces the corresponding first filter 121, so as to improve the stability of the first lens fiber 131 and avoid the position deviation of the first lens fiber 131 caused by temperature change. In this way, the stability of the transmission path of the optical signals is ensured, and the accuracy of the transmission of the optical signals is improved.

[0121] Similarly, the second plurality of filters 122 are spaced apart. That is, there is a certain distance between two adjacent second filters 122. The second plurality of lens fibers 132 are correspondingly spaced apart on the second fixing member 142, and the spacing of the second plurality of filters 122 can reduce the mutual interference between light signals of different wavelengths and improve the accuracy and stability of the separation of light signals of different wavelengths.

[0122] The second fixing member 142 and the multiplexer optical path board 11 are fixed on the base plate 16, and the second fixing member 142 is fixed corresponding to the multiplexer optical path board 11. The second fixing member 142 can be arranged at the corresponding position of the multiplexer optical path board 11 and can be relatively fixed with the multiplexer optical path board 11, so as to ensure the stability of the transmission path of the optical signal. The convex lens part 13b of the second lens optical fiber 132 faces the corresponding second filter 122. In this way, the stability of the second lens optical fiber 132 is improved, and the position deviation of the second lens optical fiber 132 caused by temperature change is avoided. Moreover, the stability of the transmission path of the optical signal is ensured, and the accuracy of the optical signal transmission is improved.

[0123] With reference to Figure 3 , Figure 5 and Figure 6 , the first fixing member 141 is provided with a plurality of first fixing grooves 1411, and the plurality of first fixing grooves 1411 are arranged at intervals. That is to say, there is a certain distance between the two adjacent first fixing grooves 1411. The first fixing member 141 accommodates the plurality of first lens optical fibers 131 through the plurality of first fixing grooves 1411, so as to realize the corresponding arrangement of the plurality of first lens optical fibers 131 and the plurality of first filters 121. In this way, the loss of the optical signal in the transmission process can be reduced, and the transmission efficiency of the wavelength division multiplexer 10 is improved.

[0124] The plurality of first fixing grooves 1411 ensure the accurate positioning of the plurality of first lens optical fibers 131, reduce the error of the optical signal transmission, and improve the coupling efficiency and transmission quality of the optical signal.

[0125] In some embodiments of the present application, the main body 13a of the first lens optical fiber 131 is arranged in the first fixing groove 1411, so as to ensure the position stability of the first lens optical fiber 131.

[0126] For example, the "V"-shaped grooves are machined on the first fixing member 141 by using precision machining technology (such as laser cutting, micro-machining, etc.). The surface of the "V"-shaped grooves is smooth and the size is accurate, so as to ensure the accuracy of the position of the first lens optical fiber 131, so that the optical signal can be smoothly transmitted and the scattering and loss are reduced.

[0127] With reference to Figure 3 or Figure 5 , the second fixing member 142 is provided with a plurality of second fixing grooves 1421, and the plurality of second fixing grooves 1421 are arranged at intervals. That is to say, there is a certain distance between the two adjacent second fixing grooves 1421. The second fixing member 142 accommodates the plurality of second lens optical fibers 132 through the plurality of second fixing grooves 1421, so as to realize the corresponding arrangement of the plurality of second lens optical fibers 132 and the plurality of second filters 122. In this way, the loss of the optical signal in the transmission process can be reduced, and the transmission efficiency of the wavelength division multiplexer 10 is improved.

[0128] The plurality of second fixing grooves 1421 ensure accurate positioning of the plurality of second lens fibers 132, reduce errors in optical signal transmission, and improve coupling efficiency and transmission quality of optical signals.

[0129] In some embodiments of the present application, the main body 13a of the second lens fiber 132 is arranged in the second fixing groove 1421 to ensure stable positioning of the second lens fiber 132.

[0130] For example, the V-shaped grooves are machined on the second fixing member 142 by using precision machining techniques such as laser cutting and micro-machining. The surfaces of the V-shaped grooves are smooth and accurate in size to ensure the accuracy of the position of the second lens fiber 132, so that the optical signal can be smoothly transmitted and the scattering and loss are reduced.

[0131] In some embodiments of the present application, the wavelength division multiplexer further comprises a third fixing member 143 for fixing the combining fiber 133. The third fixing member 143 provides support and fixation for the combining fiber 133, ensures stable positioning of the combining fiber 133, and thus guarantees stable transmission path of the optical signal and reduces optical signal loss and errors.

[0132] The third fixing member 143 can also be fixed on the substrate 16 and fixed correspondingly with the multiplexer optical path board 11 through the substrate 16, that is, the third fixing member 143 can be arranged at a corresponding position of the multiplexer optical path board 11 and can be relatively fixed with the multiplexer optical path board 11, so as to guarantee the stability of the transmission path of the optical signal. In this way, the position of the combining fiber 133 in the wavelength division multiplexer 10 can not be deviated.

[0133] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0134] In the description of the present application, it should be understood that the terms "include" and "have" and any variations thereof used herein are intended to cover non-exclusive inclusion, for example, a process, method, system, product or apparatus including a series of steps or units need not be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or apparatuses.

[0135] Unless specifically stated and defined, the terms "mounting", "connected", "connecting", "fixed", and the like, should be interpreted broadly, for example, can be fixed connection, can also be detachable connection, or become an integral; can be directly connected, or indirectly connected through an intermediate medium, can be connected inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0136] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A wavelength division multiplexer, characterized by A multiplexer optical path board (11), a plurality of optical filters (12), and a plurality of lens fibers (13); The plurality of optical filters (12) are arranged on the multiplexer optical path board (11) to form a preset optical path, and the filtering wavelengths of the optical filters (12) are different; The preset optical path has a light combining end for connecting with a light combining fiber (133); The plurality of lens fibers (13) are arranged correspondingly with the plurality of optical filters (12); the lens fiber (13) comprises a main body (13a) and a convex lens portion (13b), the main body (13a) is used at least for connecting with a light splitting fiber (134); the convex lens portion (13b) is arranged on the main body (13a), and the convex lens portion (13b) is arranged protruding towards the corresponding optical filter (12).

2. The wavelength division multiplexer of claim 1, wherein, The optical filter (12) comprises a plurality of first optical filters (121) and a plurality of second optical filters (122), the first optical filters (121) are arranged on the same side of the light combining end, and the second optical filters (122) are arranged on the opposite side of the light combining end; The plurality of lens fibers (13) comprise a plurality of first lens fibers (131) and a plurality of second lens fibers (132); the plurality of first lens fibers (131) are arranged correspondingly with the plurality of first optical filters (121), and the plurality of second lens fibers (132) are arranged correspondingly with the plurality of second optical filters (122).

3. The wavelength division multiplexer of claim 2, wherein, The wavelength division multiplexer (10) comprises a first fixing member (141) for fixing the plurality of first lens fibers (131); The wavelength division multiplexer (10) comprises a second fixing member (142) for fixing the plurality of second lens fibers (132).

4. The wavelength division multiplexer of claim 3, wherein, The wavelength division multiplexer (10) comprises a substrate (16); The plurality of first optical filters (121) are arranged at intervals, and the plurality of first lens fibers (131) are arranged at intervals on the first fixing member (141); The first fixing member (141) is fixed correspondingly with the multiplexer optical path board (11) through the substrate (16), and the convex lens portion (13b) of the first lens fiber (131) faces the corresponding first optical filter (121); The plurality of second optical filters (122) are arranged at intervals, and the plurality of second lens fibers (132) are arranged at intervals on the second fixing member (142); The second fixing member (142) is fixed correspondingly with the multiplexer optical path board (11) through the substrate (16), and the convex lens portion (13b) of the second lens fiber (132) faces the corresponding second optical filter (122).

5. The wavelength division multiplexer of claim 3, wherein, The first fixing member (141) is provided with a plurality of first fixing grooves (1411) arranged at intervals; The first fixing member (141) accommodates the plurality of first lens fibers (131) through the plurality of first fixing grooves (1411), and the main body (13a) of the first lens fiber (131) is arranged in the first fixing groove (1411).

6. The wavelength division multiplexer of claim 3, wherein, The second fixing member (142) is provided with a plurality of second fixing grooves (1421) arranged at intervals; The second fixing member (142) accommodates the plurality of second lens fibers (132) through the plurality of second fixing grooves (1421), and the main body (13a) of the second lens fiber (132) is arranged in the second fixing groove (1421).

7. The wavelength division multiplexer of claim 3, wherein, The first fixing member (141) is provided with a first adhesive layer, and the first fixing member (141) connects the plurality of first lens fibers (131) through the first adhesive layer; The second fixing member (142) is provided with a second adhesive layer, and the second fixing member (142) connects the plurality of second lens fibers (132) through the second adhesive layer.

8. The wavelength division multiplexer of claim 4, wherein, The wavelength division multiplexer (10) further comprises a third fixing member (143) corresponding to the multiplexer optical path board (11) through the substrate (16), and the third fixing member (143) is used for fixing at least the light combining fiber (133).

9. The wavelength division multiplexer according to any of claims 1-8, characterized in that, The lens fiber (13) is used to form the light splitting fiber (134), and the main body (13a) is integrally arranged with the light splitting fiber (134).

10. The wavelength division multiplexer according to any one of claims 1 to 8, characterized in that, The convex lens part (13b) is arranged as an aspherical convex lens part (13b).

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