High-integration wavelength division multiplexing module

Abstract

The utility model relates to the technical field of optical communication, in particular to a high-integration wavelength division multiplexing module, which solves the problem that a plurality of same wavelengths cannot be output together by a WDM (Wavelength Division Multiplexing) device in a free space by connecting an optical splitter, a plurality of optical fiber couplers, a plurality of wavelength division multiplexers and a plurality of optical fiber rings. Optical fiber couplers with different splitting ratios are used for splitting power, the first-stage design is that an optical splitter replaces the optical fiber coupler for splitting power, and the problems that loss is increased when optical fibers with different mode field diameters are fused and IL coupling parameters are not good when optical paths of the optical fibers with different mode field diameters are coupled can be solved; meanwhile, the problem of time delay in optical fiber transmission is solved by designing optical fiber rings with different lengths, the problem of small product size and the risk of optical fiber breakage are reduced by winding a plurality of optical fibers together through designing a ring-in-ring process, and at most four optical fiber rings are wound at a time through a traditional ring winding process, so that the production efficiency is improved. Through the technology, the number of the winding rings is not limited.

Description

Technical Field

[0001] This utility model relates to the field of optical communication technology, and in particular to a highly integrated wavelength division multiplexing module. Background Technology

[0002] Wavelength division multiplexers (WDM) are primarily used in fiber optic communication. In typical applications, they perform multiplexing and demultiplexing operations on optical signals. Multiplexing combines optical signals of different wavelengths into a single optical fiber for transmission, significantly increasing the fiber's transmission capacity and improving efficiency. Demultiplexing, on the other hand, breaks down a composite optical signal containing multiple different wavelengths transmitted through a single fiber into individual wavelength signals, allowing these signals to be accurately received and processed by the receiving equipment. With the continuous development of fiber optic communication technology, increasingly specific demands are being placed on WDM devices. Miniaturization and high integration have become important development directions.

[0003] Among existing related technologies, WDM devices are a commonly used type. They can achieve functions such as optical signal processing to a certain extent. Free-space products can have the advantages of high integration and miniaturization, such as... Figure 1 As shown, taking the filtering of nine different wavelengths as an example, the diagram shows nine filters with different wavelengths. Filters 1 to 9 represent filters with transmission wavelengths of 1471nm, 1491nm, 1511nm, 1531nm, 1551nm, 1571nm, 1591nm, 1611nm, and 1260nm, respectively. The light emitted from the light source in the 1260nm-1620nm range is connected to the product input terminal. The light enters the product from the input terminal and first strikes filter 1. The 1471nm light passes through the transmission port of filter 1 and collimator 1 before being output to the corresponding user terminal. Light of other wavelengths is reflected by the reflective surface of filter 1 to filter 2. The 1491nm wavelength light passes through the transmission port of filter 2 and collimator 2 before being output to the corresponding user terminal. Other light is reflected by the reflective end of filter 2 to filter 3, and so on, to obtain the light of the wavelength required by each user terminal.

[0004] However, free-space products cannot handle situations requiring multiple devices to output the same wavelength simultaneously. If multiple identical filters are mounted on a free-space WDM device, the required wavelength will always be output from the transmission port of the first filter, meaning only the user terminal corresponding to the first filter can obtain the desired wavelength. Therefore, free-space WDM devices cannot solve the problem of outputting multiple identical wavelengths simultaneously. This significantly limits practical applications where multiple identical wavelengths need to be processed simultaneously, failing to meet the demands of certain scenarios requiring simultaneous multi-wavelength output.

[0005] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Utility Model Content

[0006] The technical problem this invention aims to solve is how to address the difficulty that existing technologies cannot meet the demand for simultaneous output of multiple wavelengths in certain specific scenarios.

[0007] The present invention adopts the following technical solution:

[0008] This utility model provides a highly integrated wavelength division multiplexing module, including: an optical splitter, N wavelength division multiplexers, N-2 fiber couplers, and N-1 fiber rings;

[0009] The common end of the beam splitter is used to connect to the user end, the transmission end of the beam splitter is connected to the common end of the first wavelength division multiplexer, and the reflection end and transmission end of the first wavelength division multiplexer are respectively connected to the client end;

[0010] The reflective end of the beam splitter is connected to one end of the first fiber optic ring, the other end of the first fiber optic ring is connected to the input end of the first fiber optic coupler, the first output end of the first fiber optic coupler is connected to the common end of the second wavelength division multiplexer, and the reflective end and the transmission end of the second wavelength division multiplexer are respectively connected to the client end; the second output end of the first fiber optic coupler is connected to one end of the second fiber optic ring, the other end of the second fiber optic ring is connected to the input end of the second fiber optic coupler, and so on, until all devices are connected;

[0011] The second output end of the (N-2)th fiber coupler is connected to one end of the (N-1)th fiber ring, and the other end of the (N-1)th fiber ring is connected to the common end of the Nth wavelength division multiplexing device.

[0012] Preferably, the wavelength division multiplexer includes a dual-core ferrule assembly 1, a single-core collimator 2, and a protective housing 3; the dual-core ferrule assembly 1 includes a thin-diameter optical fiber 10, a conventional optical fiber 11, a capillary tube 12, a lens 13, a filter 14, and a glass tube 15.

[0013] One end of the thin-diameter optical fiber 10 and one end of the conventional optical fiber 11 are disposed in the capillary tube 12. The capillary tube 12 is disposed in the glass tube 15. One end of the capillary tube 12 is coupled to the lens 13. The lens 13 is coupled to the filter 14. The lens 13 is partially disposed in the glass tube 15.

[0014] The filter 14 is coupled to the single-core collimator 2. The dual-core pin assembly 1 and the single-core collimator 2 are both disposed in the protective housing 3. Adhesive is disposed between the outer wall of the glass tube 15 and the outer wall of the single-core collimator 2 and the inner wall of the protective housing 3.

[0015] Preferably, both the common end and the transmission end of the optical splitter are connected to optical fibers with a constant field diameter of 245um-255um.

[0016] Preferably, the outer diameter of the optical fiber at the reflective end of the beam splitter and the optical fiber in the optical fiber ring are both in the range of 134um-136um.

[0017] Preferably, the multiple fiber couplers have different splitting ratios, an outer diameter of less than or equal to 2.4 mm, and a length of less than or equal to 20 mm.

[0018] Preferably, it also includes an optical fiber connector, which is connected to the common end of the splitter;

[0019] It also includes multiple MT connectors, and both the transmission end and the reflection end of the wavelength division multiplexer are connected to MT (Multi-fiber touch) connectors.

[0020] Preferably, the reflective end of the beam splitter outputs 90%-95% of the optical signal, and the transmissive end of the beam splitter outputs 5%-10% of the optical signal.

[0021] Preferably, a heat-shrinkable sleeve is provided on the solder joint between the transmission end of the beam splitter and the first wavelength division multiplexer. The outer diameter of the heat-shrinkable sleeve is less than or equal to 1 mm, and the length ranges from 13 mm to 17 mm.

[0022] Preferably, the height of multiple fiber optic rings coiled together is less than or equal to 4.2 mm, the inner diameter is in the range of 5 mm to 7 mm, and the outer diameter is less than or equal to 67.5 mm.

[0023] Preferably, it also includes a cover plate 4, a spacer 5, and a base 6. Multiple fiber rings are coiled together and then disposed in the base 6. The spacer 5 is disposed on the coiled fiber rings. The optical splitter, multiple wavelength division multiplexers, and multiple fiber couplers are connected together and then disposed on the spacer 5. The cover plate 4 is disposed on the optical splitter, multiple wavelength division multiplexers, and multiple fiber couplers.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] This invention solves the problem of outputting multiple identical wavelengths simultaneously, a challenge that WDM devices in free space cannot address, by connecting a beam splitter, multiple fiber couplers, multiple wavelength division multiplexers, and multiple fiber rings. It employs fiber couplers with different splitting ratios for power splitting, with the first stage designed as a beam splitter instead of a fiber coupler for power splitting. This solves the problems of increased loss during fiber fusion with fibers of different mode field diameters and poor insertion loss (IL) coupling parameters when coupling fibers of different mode field diameters. Simultaneously, it addresses the time delay issue in fiber transmission by designing fiber rings of varying lengths. Furthermore, the design of a ring-within-a-ring process reduces the size of the product and the risk of fiber breakage by winding multiple fibers together. While traditional ring-winding processes can only wind a maximum of four fiber rings at a time, this technology allows for an unlimited number of rings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a WDM device in free space provided by an embodiment of the present invention;

[0028] Figure 1a This is a schematic diagram of the structure of a highly integrated wavelength division multiplexing module provided in an embodiment of this utility model;

[0029] Figure 1b This is a schematic diagram of the specific structure of a highly integrated wavelength division multiplexing module provided in this embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of a fiber optic ring coil structure provided in an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of a wavelength division multiplexer provided in an embodiment of this utility model;

[0032] Figure 4 This is a schematic diagram of the packaging structure of a highly integrated wavelength division multiplexing module provided in an embodiment of this utility model.

[0033] In all the accompanying drawings, the same reference numerals denote the same structure, wherein:

[0034] Dual-core ferrule assembly 1, fine-diameter optical fiber 10, conventional optical fiber 11, capillary tube 12, lens 13, filter 14, glass tube 15, single-core collimator 2, protective housing 3, cover plate 4, spacer 5, base 6. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0036] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as openly inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples; that is, although they may be incorporated into embodiments or examples using the above terms for reasons such as order and position, it does not limit them to be incorporated in combination by a single embodiment or example.

[0037] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, for example, the description may use the prefix "A" or "B" to describe the same type of nouns as two independent entities. In this case, the features defined with "A" and "B" are used only to distinguish between similar entities and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0038] In describing some embodiments, the terms "coupled," "coupled," and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "connected" or "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other, such as "optical coupling" or "wireless connection." The embodiments disclosed herein are not necessarily limited to the scope of this invention.

[0039] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1:

[0041] To address the aforementioned problems, this utility model provides a highly integrated wavelength division multiplexing module, such as... Figure 1a and Figure 1b As shown, the system includes: a beam splitter, N wavelength division multiplexers (WDMs), N-2 fiber optic couplers, and N-1 fiber optic rings. The common end of each beam splitter is connected to the user end. The transmission end of each beam splitter is connected to the common end of the first WDM. The reflection and transmission ends of the first WDM are respectively connected to the user end. The reflection end of each beam splitter is connected to one end of the first fiber optic ring, and the other end of the first fiber optic ring is connected to the input end of the first fiber optic coupler. The first output end of the first fiber optic coupler is connected to the common end of the second WDM. The reflection and transmission ends of the second WDM are respectively connected to the user end. The second output end of the first fiber optic coupler is connected to one end of the second fiber optic ring, and the other end of the second fiber optic ring is connected to the input end of the second fiber optic coupler, until all devices are connected. The second output end of the (N-2)th fiber optic coupler is connected to one end of the (N-1)th fiber optic ring, and the other end of the (N-1)th fiber optic ring is connected to the common end of the Nth WDM. (Refer to...) Figure 1b In this embodiment, N=12 is used as an example.

[0042] To facilitate user operation, the input end (i.e., the common end of the optical splitter) and output end (i.e., the transmission and reflection ends of each wavelength division multiplexer) of the highly integrated wavelength division multiplexing module both use bend-resistant A3 optical fiber with a constant field diameter of 250µm. The common end and transmission end of the optical splitter are both connected to optical fibers with a constant field diameter of 245µm-255µm. As a key component in the module's initial stage, the optical splitter's common end connects to the user end, playing a fundamental role in splitting the optical signal from the user end. Specifically, the reflection end of the optical splitter outputs 90%-95% of the optical signal, and the transmission end outputs 5%-10% of the optical signal.

[0043] The reflective end of the beam splitter is connected to one end of the fiber ring 1. To allow the 1000-meter fiber to be wound around, the outer diameter of the fiber at the reflective end of the beam splitter and the fiber in the fiber ring are both in the range of 134um-136um (i.e., the outer diameter of the fiber in the fiber ring can be any value between 134um, 136um, or 134um-136um, the same applies below, and will not be elaborated further in this embodiment). In one embodiment, the fiber ring uses a small-diameter, small-mode-field fiber with an outer diameter less than or equal to 135um.

[0044] It is worth noting that, for ease of description, in Figure 1b Each fiber optic ring is represented individually, but in reality, all fiber optic rings are coiled together, as described below. Fiber optic rings serve to buffer and regulate optical signals, while fiber optic couplers distribute the input optical signal to different outputs (first and second outputs) according to a certain ratio, guiding the optical signal flow to subsequent wavelength division multiplexers and other devices, ensuring the orderly transmission of optical signals within the entire module. Based on the user's actual needs, multiple fiber optic couplers have different splitting ratios, with an outer diameter less than or equal to 2.4 mm and a length less than or equal to 20 mm. To ensure good IL consistency across channels, fiber optic couplers with different splitting ratios are used for power splitting. Since the insertion loss is lowest when the input and output of the fiber optic coupler are made of the same type of fiber, the first stage design uses a beam splitter instead of a fiber optic coupler for power splitting. The common and transmission ends of the beam splitter are designed with a standard mode field of 250 μm A3, while the reflection end is designed with a small mode field of 80 / 135 fiber for fusion splicing with fiber optic rings of small mode field diameter.

[0045] In one embodiment, the highly integrated wavelength division multiplexing (WDM) module further includes an optical fiber connector connected to the common end of the splitter; the highly integrated WDM module also includes multiple MT connectors, with both the transmission and reflection ends of the WDM connected to MT connectors. Specifically, the input end of the splitter uses a conventional connector such as a Fiber Connector / Angled Physical Contact (FC / APC) (i.e., an optical fiber connector), while the output port (i.e., the transmission and reflection ends of the WDM) uses a highly integrated 12-core MT connector.

[0046] To reduce the need for fiber optic pigtails, in one embodiment, a heat-shrink tubing is provided at the solder joint between the transmission end of the optical splitter and the first wavelength division multiplexer. The heat-shrink tubing has an outer diameter of less than or equal to 1 mm and a length ranging from 13 mm to 17 mm. Heat-shrink tubing is also provided at the solder joint between the fiber coupler and the fiber ring. By using heat-shrink tubing at the solder joint, space can be effectively reduced and product performance improved (by reducing the increased insertion loss caused by fiber inclusion).

[0047] Traditional fiber optic ring winding processes have certain operational methods for winding fiber optic rings, but winding multiple rings together is prone to knotting and carries a high risk of fiber breakage. Therefore, existing technologies can only wind a maximum of four fiber optic rings at a time. In one embodiment, conventional fiber optic rings are divided into boneless, boned, and glue-fixed types. Boned fiber optic rings are suitable for products with unrestricted space but are larger in size. Boneless fiber optic rings can save the space of a skeleton compared to boned fiber optic rings, but the wound fiber is not compact enough. The fiber optic ring designed in this embodiment uses a specially made UV glue-fixed fiber optic ring. Low tension control is maintained throughout the winding process, and high-precision clamps are used. After winding to the required length, UV glue is applied to fix the fiber. To prevent the fiber from sticking to the clamp, the winding clamp needs to be pre-treated before winding to prevent the fiber from sticking to the clamp, which could lead to fiber damage or breakage. The fiber optic ring required in this embodiment uses small-diameter, small-mode-field fiber, such as... Figure 2 As shown, multiple fiber optic loops wound together have a height of less than or equal to 4.2 mm, an inner diameter ranging from 5 mm to 7 mm, and an outer diameter of less than or equal to 67.5 mm. By designing a loop-within-a-loop process to wind multiple fibers together, the problem of small product size and the risk of fiber breakage are reduced. Traditional loop-winding processes can only wind a maximum of 4 fiber optic loops at a time, while this technology allows for an unlimited number of loops.

[0048] In one embodiment, the optical signal transmission path is as follows: the optical signal input from the user end is first split by a splitter. One part directly enters the first wavelength division multiplexer (WDM) and is output from the transmission and reflection ends of the first WDM. The other part of the optical signal enters a subsequent link composed of fiber optic rings and fiber optic couplers. In this link, the signal is continuously split by fiber optic couplers and interacts with various WDMs. The optical signal is processed sequentially according to the designed path until the last WDM device completes its operation, achieving progressive and orderly processing of multi-wavelength signals. Through the synergistic effect of multiple WDMs, different wavelengths can be distinguished and processed more precisely. Compared to traditional single WDM in free space, this improves the accuracy of wavelength selection, reduces the possibility of wavelength crosstalk, and ensures that each wavelength optical signal can be transmitted independently and with high quality.

[0049] In one embodiment, such as Figure 3 As shown, the wavelength division multiplexer includes a dual-core ferrule assembly 1, a single-core collimator 2, and a protective housing 3. The dual-core ferrule assembly 1 includes a thin-diameter optical fiber 10, a conventional optical fiber 11, a capillary tube 12, a lens 13, a filter 14, and a glass tube 15. One end of the thin-diameter optical fiber 10 and one end of the conventional optical fiber 11 are disposed in the capillary tube 12, which is disposed in the glass tube 15. One end of the capillary tube 12 is coupled to the lens 13, which is coupled to the filter 14. The lens 13 is partially disposed in the glass tube 15. The filter 14 is coupled to the single-core collimator 2. Both the dual-core ferrule assembly 1 and the single-core collimator 2 are disposed in the protective housing 3. Adhesive is applied between the outer wall of the glass tube 15 and the outer wall of the single-core collimator 2 and the inner wall of the protective housing 3.

[0050] The fabrication process of the wavelength division multiplexer includes:

[0051] First, lens 13 and filter 14 are fixed with UV adhesive. After curing, the product needs to be aged at 85℃ and subjected to 24 hours of temperature cycling. Then, the thin-diameter optical fiber 10 is processed to increase its mode field diameter so that it can match the mode field of the conventional optical fiber 11. After the mode field diameter test is qualified, it is inserted into the glass tube 15. The through hole of the glass tube 15 is filled with epoxy adhesive and cured. Adhesive is applied at the root to protect the tail optical fiber. The conventional optical fiber 11 is placed in another channel of the glass tube 15. The assembly is placed at room temperature for 24 hours to allow the adhesive to fully cure. Then, the glass tube 15 is ground and polished to the required length and angle range, and then coated.

[0052] Align the bevel of glass tube 15 with the bevel of lens 13. Adjust the mating surfaces of lens 13 and glass tube 15 using a five-dimensional adjustment frame to ensure that the insertion loss and return loss meet specifications. Apply a suitable amount of glue between glass tube 15 and lens 13 to fix them in place. After the glue has fully cured, color the thin-diameter fiber 10 (the colored port is generally used as the product's input port). The uncolored standard field-field fiber is used as the product's reflection port. Aging, temperature cycling, testing of optical parameters, and packaging complete the fabrication of the dual-core ferrule assembly 1.

[0053] The tested and qualified dual-core ferrule assembly 1 and the conventional single-core collimator 2 are coupled together. Since one of the optical fibers in the dual-core ferrule assembly 1 is a thin-diameter fiber 10, to prevent the insertion loss of approximately 0.8dB between the conventional fiber 11 and the thin-diameter small-mode-field fiber, a thin-diameter small-mode-field fiber of the same type as the device fiber must also be spliced ​​to the light source fiber for light storage. During debugging, the colored thin-diameter fiber 10 is used as the input port of the product, and the output end of the single-core collimator 2 is used as the transmission port. The insertion loss and return loss are adjusted through the automatic coupling system. After both meet the specifications, UV glue is applied to fix the dual-core ferrule assembly 1 and the single-core collimator 2. After the glue cures, a second heat curing is performed, followed by at least 24 hours of temperature cycling to release the hardness of the glue. Finally, after all optical indicators (including insertion loss, isolation, in-band ripple, return loss, polarization correlation loss, etc.) pass the test, the product passes the appearance inspection, and is then packaged to complete the production of the wavelength division multiplexer.

[0054] In one embodiment, the design and dimensions of the optical splitter are the same as those of the wavelength division multiplexer described above. The difference is that since the optical splitter serves as the input end of the entire module, it needs to be connected to the user end. The user end uses 250µm fiber with a constant field of view, so the common port of the optical splitter also needs to use 250µm fiber with a constant field of view. This will not be elaborated further in this embodiment.

[0055] In one embodiment, such as Figure 4 As shown, the highly integrated wavelength division multiplexing module also includes a cover plate 4, a spacer 5, and a base 6. Multiple fiber rings are coiled together and then placed in the base 6. The spacer 5 is placed on the coiled fiber rings (represented by M in the figure). The optical splitter, multiple wavelength division multiplexers, and multiple fiber couplers are connected together and then placed on the spacer 5 (represented by N in the figure). The cover plate 4 is placed on the optical splitter, multiple wavelength division multiplexers, and multiple fiber couplers.

[0056] In this process, fiber optic rings that have passed optical performance and fiber length tests are fixed to the bottom of the base 6 with adhesive. After the adhesive has fully cured, the spacer 5 and assembly screws (not labeled in the figure) are installed. The splitter, multiple wavelength division multiplexers, and multiple fiber couplers are placed on the spacer 5 and secured with silicone. Each fiber is cut and fused to the required length according to the document, and all fibers are coiled into the module box. The input and output fibers are then passed out of the box. The input end is fitted with a conventional connector such as FC / APC, while the output port, which has more fibers, is designed with a highly integrated 12-core MT connector. Ultimately, this allows 12 wavelength division multiplexers, 10 fiber couplers, 1 splitter, and 11 fiber optic rings to be housed in a module box smaller than 74mm x 74mm x 12mm.

[0057] This embodiment solves the problem of outputting multiple identical wavelengths simultaneously, a challenge that WDM devices in free space cannot address, by connecting a beam splitter, multiple fiber couplers, multiple wavelength division multiplexers, and multiple fiber rings. It employs fiber couplers with different splitting ratios for power splitting, with the first stage designed as a beam splitter instead of a fiber coupler for power splitting. This solves the problems of increased loss during fiber fusion with fibers of different mode field diameters and poor IL coupling parameters when coupling optical paths with fibers of different mode field diameters. Simultaneously, by designing fiber rings of varying lengths, it addresses the time delay issue in fiber transmission. Furthermore, by using a ring-within-a-ring process to wrap multiple fibers together, it reduces the problem of small product size and the risk of fiber breakage. Traditional ring-winding processes can only wind a maximum of four fiber rings at a time; this technology allows for an unlimited number of rings.

[0058] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A highly integrated wavelength division multiplexing module, characterized in that, include: Optical splitter, N wavelength division multiplexers, N-2 fiber couplers, and N-1 fiber rings; The common end of the beam splitter is used to connect to the user end, the transmission end of the beam splitter is connected to the common end of the first wavelength division multiplexer, and the reflection end and transmission end of the first wavelength division multiplexer are respectively connected to the client end; The reflective end of the beam splitter is connected to one end of the first fiber optic ring, the other end of the first fiber optic ring is connected to the input end of the first fiber optic coupler, the first output end of the first fiber optic coupler is connected to the common end of the second wavelength division multiplexer, and the reflective end and the transmission end of the second wavelength division multiplexer are respectively connected to the client end; the second output end of the first fiber optic coupler is connected to one end of the second fiber optic ring, the other end of the second fiber optic ring is connected to the input end of the second fiber optic coupler, and so on, until all devices are connected; The second output end of the (N-2)th fiber coupler is connected to one end of the (N-1)th fiber ring, and the other end of the (N-1)th fiber ring is connected to the common end of the Nth wavelength division multiplexing device.

2. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, The wavelength division multiplexer includes a dual-core ferrule assembly (1), a single-core collimator (2), and a protective housing (3); the dual-core ferrule assembly (1) includes a thin-diameter optical fiber (10), a conventional optical fiber (11), a capillary tube (12), a lens (13), a filter (14), and a glass tube (15); One end of the thin-diameter optical fiber (10) and one end of the conventional optical fiber (11) are disposed in the capillary tube (12), the capillary tube (12) is disposed in the glass tube (15), one end of the capillary tube (12) is coupled to the lens (13), the lens (13) is coupled to the filter (14), and the lens (13) is partially disposed in the glass tube (15); The filter (14) is coupled to the single-core collimator (2). The dual-core pin assembly (1) and the single-core collimator (2) are both disposed in the protective housing (3). Adhesive is disposed between the outer wall of the glass tube (15) and the outer wall of the single-core collimator (2) and the inner wall of the protective housing (3).

3. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, The common end and transmission end of the optical splitter are both connected to optical fibers with an outer diameter of 245um-255um for the constant field.

4. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, The outer diameter of the optical fiber at the reflective end of the beam splitter and the optical fiber in the optical fiber ring are both in the range of 134um-136um.

5. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, Multiple fiber couplers have different splitting ratios, with an outer diameter of less than or equal to 2.4 mm and a length of less than or equal to 20 mm.

6. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, It also includes an optical fiber connector, which is connected to the common end of the splitter; It also includes multiple MT connectors, and both the transmission end and the reflection end of the wavelength division multiplexer are connected to MT connectors.

7. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, The reflective end of the beam splitter outputs 90%-95% of the optical signal, and the transmission end of the beam splitter outputs 5%-10% of the optical signal.

8. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, A heat-shrink tubing is provided on the solder joint between the transmission end of the beam splitter and the first wavelength division multiplexer. The outer diameter of the heat-shrink tubing is less than or equal to 1 mm, and the length ranges from 13 mm to 17 mm.

9. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, When multiple fiber optic rings are coiled together, the height is less than or equal to 4.2 mm, the inner diameter is in the range of 5 mm to 7 mm, and the outer diameter is less than or equal to 67.5 mm.

10. The highly integrated wavelength division multiplexing module according to claim 1, characterized in that, It also includes a cover plate (4), a spacer (5) and a base (6). Multiple fiber rings are coiled and placed in the base (6). The spacer (5) is placed on the coiled fiber rings. The splitter, multiple wavelength division multiplexers and multiple fiber couplers are connected together and placed on the spacer (5). The cover plate (4) is placed on the splitter, multiple wavelength division multiplexers and multiple fiber couplers.

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