DWDM device with channel interval of 50GHz

Abstract

The invention discloses a DWDM device with a channel interval of 50GHz, and relates to the technical field of optical fiber communication. The DWDM device with the channel interval of 50GHz comprises a shell, a three-core optical fiber head, a collimator, a 100GHz filter and a full reflector, wherein a mounting cavity with an opening is formed in the shell; the three-core optical fiber head is inserted into the opening; the collimator is arranged in the mounting cavity and is connected with the three-core optical fiber head; the 100GHz filter is arranged corresponding to the collimator and is positioned on one side, opposite to the three-core optical fiber head, of the collimator; and the full reflector is arranged on one side of the 100GHz filter back to the collimator. An optical signal input by the three-core optical fiber head passes through the collimator, then passes through the 100GHz filter, reaches the full reflector, passes through the 100GHz filter for the second time after being reflected, and is output from the three-core optical fiber head after passing through the collimator. And the optical signal passes through the same 100GHz filter twice in the reciprocating process to be coupled to obtain a 50GHz wavelength channel, so that the beneficial effect of reducing the volume occupation and the cost of the 50G DWDM is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber communication, and in particular to a DWDM device with a channel spacing of 50 GHz. Background Art

[0002] With the rapid growth of communication technology, CWDM (Coarse Wavelength Division Multiplexing) and 100G DWDM (Dense Wavelength Division Multiplexing) have begun to fail to meet the communication system's utilization of channel bands. Among them, the CWDM channel spacing is 20nm, and there are only 18 channels in the 1260-1620 full communication band. The 100G DWDM channel spacing is 0.8nm, and 72 channels can be distributed in the C band, but the channel utilization rate is still not high enough.

[0003] The 50G DWDM channel spacing is 0.4nm. Compared with 100G DWDM, 50G DWDM can distribute more channels in the C band to improve channel utilization. However, due to the extremely narrow channel spacing of 50G DWDM, the cost of producing 50G DWDM filters through coating technology is high and difficult to implement, and the process operability is weak.

[0004] In the related art, a solution is proposed to use a 100G DWDM filter to achieve 50G DWDM. This solution requires two 100G DWDM devices to be connected in series and stacked to form a module box. Since two 100G DWDM devices need to be connected in series, the module box has the problem of being large in size and high in cost. Summary of the invention

[0005] The main purpose of the present invention is to propose a DWDM device with a channel spacing of 50 GHz, aiming to reduce the volume occupation and cost of 50G DWDM.

[0006] To achieve the above-mentioned purpose, the DWDM device with a channel spacing of 50 GHz proposed in the present invention includes a housing, a three-core optical fiber head, a collimator, a 100 GHz filter and a full reflector, wherein the housing is formed with a mounting cavity having an opening; the three-core optical fiber head is inserted into the opening; the collimator is arranged in the mounting cavity and connected to the three-core optical fiber head; the 100 GHz filter is arranged corresponding to the collimator and is located on a side of the collimator facing away from the three-core optical fiber head; the full reflector is arranged on a side of the 100 GHz filter facing away from the collimator.

[0007] In one embodiment, the three-core optical fiber head includes an incident fiber, a reflection fiber, a 50 GHz transmission fiber and an access device; the access device is inserted into the opening, and the incident fiber, the reflection fiber and the 50 GHz transmission fiber are all inserted into the access device from a side of the access device facing away from the installation cavity; the collimator is connected to a side of the access device facing the installation cavity.

[0008] In one embodiment, an access channel that runs through the access device is formed in the access device, and the access channel includes an insertion section, a contraction section, and a fixed section that are connected in sequence; the insertion section is provided at an end of the connector facing away from the installation cavity, the fixed section is provided at an end of the connector facing the installation cavity, and the contraction section gradually contracts along the direction from the insertion section to the fixed section; the incident fiber, the reflection fiber, and the 50 GHz transmission fiber pass through the insertion section and the contraction section in sequence and are plugged into the inner wall of the fixed section.

[0009] In one embodiment, the three-core optical fiber head also includes a dummy fiber, and the incident fiber, the 50 GHz transmission fiber, the reflection fiber and the dummy fiber are distributed along the circumference of the fixed section and plugged into the inner wall of the fixed section, and the incident fiber, the 50 GHz transmission fiber, the reflection fiber and the dummy fiber are abutted in sequence, and the dummy fiber abuts against the incident fiber.

[0010] In one embodiment, the outer shell includes an inner tube, a connecting piece and an outer tube; the inner wall of one end of the connecting piece is sleeved with the outer wall of the inner tube, and the inner wall of the outer tube is sleeved with the outer wall of the other end of the connecting piece, and the inner tube, the connecting piece and the outer tube form the installation cavity, and the opening is formed at one end of the inner tube away from the outer tube.

[0011] In one embodiment, a boss is formed on the outer wall of the connecting member, and the boss abuts against the outer tube and gradually expands along the direction from the inner tube to the outer tube.

[0012] In one embodiment, the DWDM device with a channel spacing of 50 GHz also includes a connecting sleeve, which is located on the side of the collimator facing away from the three-core optical fiber head and is sleeved on the collimator; the 100 GHz filter and the total reflector are fixed in sequence on the side of the connecting sleeve facing away from the collimator.

[0013] In one embodiment, the DWDM device with a channel spacing of 50 GHz further includes a first adhesive and a second adhesive; the first adhesive is arranged at the connection between the connecting sleeve and the 100 GHz filter, and the second adhesive is arranged at the connection between the 100 GHz filter and the total reflector.

[0014] In one embodiment, a first bevel is formed at one end of the three-core optical fiber head close to the collimator, and a second bevel matched with the first bevel is formed at one end of the collimator close to the three-core optical fiber head, and the first bevel is opposite to the second bevel.

[0015] In one embodiment, the DWDM device with a channel spacing of 50 GHz further includes a third adhesive component, and the third adhesive component is provided at the connection between the three-core optical fiber head and the collimator.

[0016] The DWDM device with a channel spacing of 50GHz of the present invention includes a housing, a three-core optical fiber head, a collimator, a 100GHz filter and a full reflector. The housing is formed with an installation cavity with an opening; the three-core optical fiber head is inserted in the opening; the collimator is arranged in the installation cavity and connected to the three-core optical fiber head; the 100GHz filter is arranged corresponding to the collimator and is located on the side of the collimator facing away from the three-core optical fiber head; the full reflector is arranged on the side of the 100GHz filter facing away from the collimator. After passing through the collimator, the optical signal input from the three-core optical fiber head passes through the 100GHz filter for the first time to reach the full reflector, passes through the 100GHz filter for the second time after being reflected by the full reflector, and is output from the three-core optical fiber head after passing through the collimator. In this way, by setting a full reflector, the optical signal passes through the same 100GHz filter twice in the round trip process to couple to obtain a channel with a wavelength of 50GHz. Compared with the solution of superimposing two 100G DWDM devices in series, the beneficial effect of reducing the volume occupation and cost of 50G DWDM is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 An exploded view of an embodiment of a DWDM device with a channel spacing of 50 GHz provided by the present invention;

[0019] Figure 2 A top view of an embodiment of a DWDM device with a channel spacing of 50 GHz provided by the present invention;

[0020] Figure 3 for Figure 2 A cross-sectional view along line A-A';

[0021] Figure 4 for Figure 3 Schematic diagram of the structure of the middle shell;

[0022] Figure 5 for Figure 3 The structural diagram of the access device;

[0023] Figure 6 for Figure 1 Schematic diagram of the assembly of the middle access device and the inner tube;

[0024] Figure 7 for Figure 6 A cross-sectional view along line BB';

[0025] Figure 8 for Figure 7 A partial enlarged view of point C in the middle;

[0026] Fig. 9 The transmission spectrum shift superposition diagram of the DWDM device with a channel spacing of 50 GHz according to the present invention.

[0027] Description of Figure Numbers:

[0028] 100. DWDM device with channel spacing of 50 GHz;

[0029] 1. Shell; 1a. Mounting cavity; 1a1. Opening; 11. Inner tube; 12. Connector; 121. Boss; 13. Outer tube; 2. Three-core optical fiber head; 21. Incident fiber; 22. Reflection fiber; 23. 50GHz transmission fiber; 24. Access device; 241. First slope; 24a. Access channel; 24a1. Insertion section; 24a2. Contraction section; 24a3. Fixed section; 25. Dummy fiber; 3. Collimator; 31. Second slope; 4. 100GHz filter; 5. Total reflector; 6. Connecting sleeve; 7. First adhesive; 8. Second adhesive; 9. Third adhesive.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The present invention provides a DWDM device 100 with a channel spacing of 50 GHz.

[0035] See also Figures 1 to 4 In one embodiment of the present invention, the DWDM device 100 with a channel spacing of 50 GHz includes a housing 1, a three-core optical fiber head 2, a collimator 3, a 100 GHz filter 4 and a full reflector 5. The housing 1 is formed with a mounting cavity 1a having an opening 1a1; the three-core optical fiber head 2 is inserted into the opening 1a1; the collimator 3 is arranged in the mounting cavity 1a and connected to the three-core optical fiber head 2; the 100 GHz filter 4 is arranged corresponding to the collimator 3 and is located on a side of the collimator 3 that is away from the three-core optical fiber head 2; the full reflector 5 is arranged on a side of the 100 GHz filter 4 that is away from the collimator 3.

[0036] In this embodiment, the housing 1 is used to encapsulate the three-core optical fiber head 2, the collimator 3, the 100GHz filter 4 and the full reflector 5 and play a protective role. The housing 1 can be made of a glass tube. An installation cavity 1a is formed in the housing 1. The housing 1 is also provided with an opening 1a1 connected to the installation cavity 1a. The installation cavity 1a is arranged in a long strip shape. For example, the housing 1 can be made of a single-mouth glass tube. The three-core optical fiber head 2 is inserted into the opening 1a1 and is sealed and connected to the inner wall of the opening 1a1. For example, an adhesive can be used to bond the outer wall of the three-core optical fiber head 2 to the inner wall of the opening 1a1. The collimator 3, the 100GHz filter 4 and the full reflector 5 are arranged in sequence in the installation cavity 1a. The collimator 3 is connected to the three-core optical fiber head 2. The three-core optical fiber head 2, the collimator 3, the 100GHz filter 4 and the full reflector 5 are coaxially arranged.

[0037] Among them, the three-core optical fiber head 2 has three pigtails, which are respectively used to access the incident light signal, output the required 50GHz light signal, and output the remaining filtered light signals. The collimator 3 can use a C-lens to collimate the light signal input by the three-core optical fiber head 2. The side of the collimator 3 facing away from the three-core optical fiber head 2 is provided with a 100GHz filter 4 and a full reflector 5 in sequence, wherein the 100GHz filter 4 can be a 100GHz thin film filter or grating filter attached to one side of the first optical prism. It should be noted that the first optical prism is coaxially arranged with the collimator 3, and the 100GHz thin film filter or grating filter is attached to the side of the first optical prism facing away from the collimator 3. The total reflector 5 can be made by attaching a high-reflection sheet or a high-reflection coating to one side of the second optical prism. It should be noted that the second optical prism is coaxially arranged with the collimator 3 and is located on the side of the first optical prism facing away from the collimator 3. The 100GHz thin film filter or grating filter is attached to the side of the second optical prism facing away from the collimator 3.

[0038] In the 50GHz interval DWDM device of this embodiment, the optical signal input from the three-core optical fiber head 2 is straightened by the collimator 3, passes through the 100GHz filter 4 and reaches the total reflector 5. The 100GHz filter 4 filters part of the clutter, and the remaining optical signal is reflected by the total reflector and passes through the 100GHz filter 4 again, and then passes through the collimator 3 and the three-core optical fiber head 2 in sequence and is output. In this process, the optical signal passes through the 100GHz filter 4 twice for coupling and superposition to obtain a channel with a wavelength of 50GHz.

[0039] The DWDM device 100 with a channel spacing of 50 GHz in this embodiment is provided with a full reflector so that the optical signal passes through the same 100 GHz filter 4 twice in the round trip process for coupling to obtain a channel with a wavelength of 50 GHz. Compared with the solution of stacking two 100G DWDM devices in series, the beneficial effect of reducing the volume occupation and cost of 50G DWDM is achieved. In addition, this embodiment uses a housing 1 made of a material such as a glass tube for packaging, avoiding the module box packaging step. In addition to occupying a smaller volume, the packaging step is simpler and it is easier to achieve industrial production.

[0040] For further information, see Figures 1 to 3 In one embodiment of the present invention, the three-core optical fiber head 2 includes an incident fiber 21, a reflection fiber 22, a 50 GHz transmission fiber 23 and an access device 24; the access device 24 is inserted into the opening 1a1, and the incident fiber 21, the reflection fiber 22 and the 50 GHz transmission fiber 23 are all inserted into the access device 24 from the side of the access device 24 facing away from the installation cavity 1a; the collimator 3 is connected to the side of the access device 24 facing the installation cavity 1a.

[0041] In this embodiment, the three-core optical fiber head 2 includes an incident fiber 21, a reflection fiber 22, and a 50 GHz transmission fiber 23. The incident fiber 21 is used to input optical signals, which may include optical signals in the entire wavelength range. The 50 GHz transmission fiber 23 is used to output the required 50 GHz optical signal, and the reflection fiber 22 is used to output the remaining filtered optical signals.

[0042] The three-core fiber head 2 also includes an access device 24, which is used to connect and fix the incident fiber 21, the reflection fiber 22 and the 50GHz transmission fiber 23 in the housing and dock with the collimator 3. The outer wall of the access device 24 is sealed to the inner wall of the opening 1a1 of the housing 1.

[0043] For further information, see Figures 3 to 5 In one embodiment of the present invention, an access channel 24a is formed in the access device 24 and runs through the access device 24. The access channel 24a includes an insertion section 24a1, a contraction section 24a2 and a fixed section 24a3 which are connected in sequence; the insertion section 24a1 is arranged at one end of the connector facing away from the installation cavity 1a, the fixed section 24a3 is arranged at one end of the connector facing the installation cavity 1a, and the contraction section 24a2 gradually contracts along the direction from the insertion section 24a1 to the fixed section 24a3; the incident fiber 21, the reflection fiber 22 and the 50GHz transmission fiber 23 pass through the insertion section 24a1 and the contraction section 24a2 in sequence and are plugged into the inner wall of the fixed section 24a3.

[0044] In this embodiment, an access channel 24a that runs through the access device 24 is formed in the access device 24, and the access channel 24a includes an insertion section 24a1, a contraction section 24a2 and a fixed section 24a3 that are connected in sequence; the inner diameter of the insertion section 24a1 is larger than the inner diameter of the fixed section 24a3, and the contraction section 24a2 connects the insertion section 24a1 and the fixed section 24a3 to achieve a uniform transition between the two and guide the insertion of the optical fiber. The fixed section 24a3 is used to converge the incident fiber 21, the reflection fiber 22 and the 50GHz transmission fiber 23, and the inner wall of the fixed section 24a3 and the inserted incident fiber 21, the reflection fiber 22 and the 50GHz transmission fiber 23 are squeezed against each other to achieve fixation. After the incident fiber 21, the reflection fiber 22 and the 50 GHz transmission fiber 23 are inserted into the access channel 24a and fixed, epoxy resin can be filled in the access channel 24a to further achieve the bonding of the incident fiber 21, the reflection fiber 22 and the 50 GHz transmission fiber 23 to the access device 24, so as to strengthen the overall structural strength and prevent the incident fiber 21, the reflection fiber 22 and the 50 GHz transmission fiber 23 from detaching from the access channel 24a.

[0045] Specifically, see Figures 6 to 8In one embodiment of the present invention, the three-core optical fiber head 2 also includes a dummy fiber 25. The incident fiber 21, the 50 GHz transmission fiber 23, the reflection fiber 22 and the dummy fiber 25 are distributed along the circumference of the fixed section 24a3 and plugged into the inner wall of the fixed section 24a3. The incident fiber 21, the 50 GHz transmission fiber 23, the reflection fiber 22 and the dummy fiber 25 are abutted in sequence, and the dummy fiber 25 is abutted against the incident fiber 21.

[0046] In this embodiment, the cross section of the fixed section 24a3 is square, the side length of the square is 250um, the diameter of the incident fiber 21, the 50GHz transmission fiber 23, the reflection fiber 22 and the dummy fiber 25 is 125um, the incident fiber 21, the 50GHz transmission fiber 23, the reflection fiber 22 and the dummy fiber 25 are abutted in sequence, and the dummy fiber 25 abuts against the incident fiber 21, and is thus inserted into the fixed section 24a3. The dummy fiber 25 is a small section of optical fiber, which is not used for signal transmission, but only plays a supporting role so that the incident fiber 21, the 50GHz transmission fiber 23 and the reflection fiber 22 can be firmly inserted into the fixed section 24a3. The center distance between the incident fiber 21 and the 50GHz transmission fiber 23 is d1, and d1 is 125um. The center distance between the incident fiber 21 and the reflection fiber 22 is d2, and d2 is 177um.

[0047] It should be explained that the optical signal input by the three-core optical fiber head 2 is straightened by the collimator 3, passes through the 100GHz filter 4 and arrives at the total reflector 5. The 100GHz filter 4 filters part of the clutter. The spacing between the incident fiber 21 and the reflected fiber 22 is 177um, which is a designed distance for producing a specific wavelength offset. The coupling center wavelength is adjusted to the ITU standard wavelength channel minus 0.155nm (ITU-0.155nm). This means that the optical signal passing through the 100GHz filter 4 for the first time has been selected on the ITU standard wavelength channel, but slightly offset by -0.155nm. The optical signal passes through the 100GHz filter 4 again after being reflected by the total reflector. This time, the center distance between the incident fiber 21 and the 50GHz transmission fiber 23 is 125um. This spacing will cause the optical signal to produce another specific wavelength offset when passing through the optical fiber. The wavelength offset is set to the ITU standard wavelength channel plus 0.155nm (ITU+0.155nm). When this shifted optical signal is superimposed on the optical signal (ITU-0.155nm) that passed through the filter last time, the interval between the two wavelength channels is halved, thus forming a channel with a wavelength interval of 50GHz. That is, the short wave (ITU-0.155nm) and the long wave (ITU+0.155nm) are shifted and superimposed to obtain a channel with a wavelength interval of 50GHz (ITU). Fig. 9 In this way, optical components such as 100 GHz filter 4 and full reflector 5 can be used to achieve denser 50 GHz DWDM channels through wavelength shifting and superposition, thereby increasing the transmission capacity of the optical fiber network.

[0048] For further information, see Figure 3 to Figure 4 In one embodiment of the present invention, the outer shell 1 includes an inner tube 11, a connecting piece 12 and an outer tube 13; the inner wall of one end of the connecting piece 12 is sleeved with the outer wall of the inner tube 11, and the inner wall of the outer tube 13 is sleeved with the outer wall of the other end of the connecting piece 12, and an installation cavity 1a is formed in the inner tube 11, the connecting piece 12 and the outer tube 13, and an opening 1a1 is formed at one end of the inner tube 11 away from the outer tube 13.

[0049] In this embodiment, in order to facilitate assembly, the housing 1 is set in three sections, the inner tube 11 and the outer tube 13 are glass tubes, the inner tube 11 is a double-mouth glass tube, the outer tube 13 is a single-mouth glass tube, and the connector 12 can be a sealing sleeve. During assembly, the three-core optical fiber head 2 is first inserted into the inner tube 11 and sealedly connected with the inner tube 11 by glue bonding or the like, then the connector 12 is sleeved on the outer wall of the inner tube 11 and sealedly connected by glue bonding or the like, then the collimator 3, the 100GHz filter 4 and the full reflector 5 are connected to one end of the three-core optical fiber head 2, and finally the collimator 3, the 100GHz filter 4 and the full reflector 5 are extended into the outer tube 13, and the inner wall of the outer tube 13 is sleeved on the outer wall of the connector 12. Among them, the inner tube 11 and the outer tube 13 are made of glass, and the connector 12 can be made of plastic or other materials to achieve sealing between the inner tube 11 and the outer tube 13. The inner tube 11, the connector 12 and the outer tube 13 are coaxially arranged to facilitate industrial assembly production. It should be noted that the connector 12 can also use an adhesive, that is, the outer wall of the inner tube 11 and the inner wall of the outer tube 13 are connected by an adhesive, and the adhesive penetrates between the inner tube 11 and the outer tube 13 to ensure the sealing performance of the outer shell 1.

[0050] For further information, see Figure 3 In one embodiment of the present invention, a boss 121 is formed on the outer wall of the connecting member 12 , and the boss 121 abuts against the outer tube 13 and gradually expands along the direction from the inner tube 11 to the outer tube 13 .

[0051] In this embodiment, a boss 121 is provided outside the connector 12 to achieve stop positioning when the outer tube 13 is sleeved outside the connector 12. When the boss 121 abuts against the outer tube 13, the outer tube 13 is installed in place. Since the outer diameter of the inner tube 11 is smaller than the outer diameter of the outer tube 13, the boss 121 is gradually expanded from the inner tube 11 to the outer tube 13, so that the outer contour size of the DWDM device 100 with a channel spacing of 50GHz is smoothly transitioned, and the sharp edges and corners on the housing 1 are reduced, so as to facilitate integrated installation in optical fiber communication equipment.

[0052] For further information, see Figure 1 and Figure 3In one embodiment of the present invention, the DWDM device 100 with a channel spacing of 50 GHz further includes a connecting sleeve 6, which is located on the side of the collimator 3 facing away from the three-core optical fiber head 2 and is sleeved on the collimator 3; the 100 GHz filter 4 and the total reflector 5 are fixed in sequence on the side of the connecting sleeve 6 facing away from the collimator 3.

[0053] In this embodiment, the inner diameter of the connecting sleeve 6 is adapted to the outer diameter of the collimator 3. For example, the connecting sleeve 6 and the collimator 3 can be set to an interference fit or a clearance fit, so that the two can be sleeved and fixed under the action of friction, and can be disassembled again. The 100GHz filter 4 and the full reflector 5 are fixed in sequence on the side of the connecting sleeve 6 facing away from the collimator 3. A slide groove can be set on the side of the connecting sleeve 6 facing away from the collimator 3. The slide groove is extended along the radial direction of the connecting sleeve 6. The size of the slide groove is adapted to the 100GHz filter 4 and the full reflector 5. After the 100GHz filter 4 and the full reflector 5 are tightly attached, they slide into the slide groove along the radial direction of the connecting sleeve 6 and are fixed to the inner wall of the slide groove by friction. In this embodiment, a connecting sleeve 6 is provided to connect the 100 GHz filter 4, the full reflector 5 and the collimator 3, thereby avoiding complicated alignment steps and reducing the complexity and difficulty of assembly. In addition, the connecting sleeve 6 and the collimator 3 can be disassembled to flexibly replace the 100 GHz filter 4 and the full reflector 5 to meet different filtering requirements.

[0054] For further information, see Figure 3 In one embodiment of the present invention, the DWDM device 100 with a channel spacing of 50 GHz further includes a first adhesive 7 and a second adhesive 8; the first adhesive 7 is arranged at the connection between the connecting sleeve 6 and the 100 GHz filter 4, and the second adhesive 8 is arranged at the connection between the 100 GHz filter 4 and the total reflector 5.

[0055] In this embodiment, the connecting sleeve 6, the 100 GHz filter 4 and the full reflector 5 can be pre-assembled and connected as a whole by setting a first adhesive 7 and a second adhesive 8. The first adhesive 7 and the second adhesive 8 can be made of resin glue. The first adhesive 7 is arranged at the connection between the connecting sleeve 6 and the 100 GHz filter 4, and the second adhesive 8 is arranged at the connection between the 100 GHz filter 4 and the full reflector 5.

[0056] For further information, see Figure 3 In one embodiment of the present invention, a first inclined surface 241 is formed at one end of the three-core optical fiber head 2 close to the collimator 3, and a second inclined surface 31 adapted to the first inclined surface 241 is formed at one end of the collimator 3 close to the three-core optical fiber head 2, and the first inclined surface 241 and the second inclined surface 31 are arranged opposite to each other.

[0057] In this embodiment, in order to reduce the direct reflection of the optical signal at the interface, a first bevel 241 is set at one end of the three-core optical fiber head 2 close to the collimator 3, and a second bevel 31 matched with the first bevel 241 is set at one end of the collimator 3 close to the three-core optical fiber head 2. Because the bevel will cause the reflected light to deviate from the original propagation path, thereby reducing the echo (reflected light) returning to the light source or laser, it helps to maintain the stability of the signal.

[0058] For further information, see Figure 3 In one embodiment of the present invention, the DWDM device 100 with a channel spacing of 50 GHz further includes a third adhesive member 9 , which is disposed at the connection between the three-core optical fiber head 2 and the collimator 3 .

[0059] In this embodiment, the third adhesive member 9 surrounds the outer wall of the connection between the three-core optical fiber head 2 and the collimator 3. There is an air gap between the three-core optical fiber head 2 and the collimator 3. By adjusting the size of the air gap, the working range of the collimator 3 can be adjusted. After the air gap is adjusted, the third adhesive member 9 connects the three-core optical fiber head 2 and the collimator 3 to lock the size of the air gap.

[0060] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A DWDM device with a channel spacing of 50 GHz, characterized in that: The DWDM device with a channel spacing of 50 GHz includes: A housing (1), wherein the housing (1) is formed with a mounting cavity (1a) having an opening (1a1); A three-core optical fiber head (2), wherein the three-core optical fiber head (2) is inserted into the opening (1a1); A collimator (3), the collimator (3) being arranged in the installation cavity (1a) and connected to the three-core optical fiber head (2); a 100 GHz filter (4), the 100 GHz filter (4) being arranged corresponding to the collimator (3) and being located on a side of the collimator (3) facing away from the three-core optical fiber head (2); A full reflector (5), wherein the full reflector (5) is arranged on a side of the 100 GHz filter (4) that faces away from the collimator (3).

2. The DWDM device with a channel spacing of 50 GHz as claimed in claim 1, characterized in that: The three-core optical fiber head (2) comprises an incident fiber (21), a reflection fiber (22), a 50 GHz transmission fiber (23) and an access device (24); The access device (24) is inserted into the opening (1a1), and the incident fiber (21), the reflection fiber (22) and the 50 GHz transmission fiber (23) are all inserted into the access device (24) from a side of the access device (24) that faces away from the installation cavity (1a); The collimator (3) is connected to a side of the access device (24) facing the installation cavity (1a).

3. The DWDM device with a channel spacing of 50 GHz as claimed in claim 2, characterized in that: An access channel (24a) is formed in the access device (24) and runs through the access device (24), and the access channel (24a) includes an insertion section (24a1), a contraction section (24a2) and a fixing section (24a3) which are connected in sequence; The insertion section (24a1) is arranged at one end of the access device (24) facing away from the installation cavity (1a), the fixing section (24a3) is arranged at one end of the access device (24) facing the installation cavity (1a), and the contraction section (24a2) gradually contracts along the direction from the insertion section (24a1) to the fixing section (24a3); The incident fiber (21), the reflection fiber (22) and the 50 GHz transmission fiber (23) pass through the insertion section (24a1) and the contraction section (24a2) and are plugged into the inner wall of the fixed section (24a3).

4. The DWDM device with a channel spacing of 50 GHz as claimed in claim 3, characterized in that: The three-core optical fiber head (2) further comprises a dummy fiber (25); The incident fiber (21), the 50 GHz transmission fiber (23), the reflection fiber (22) and the dummy fiber (25) are distributed along the circumference of the fixed section (24a3) and plugged into the inner wall of the fixed section (24a3); the incident fiber (21), the 50 GHz transmission fiber (23), the reflection fiber (22) and the dummy fiber (25) are abutted in sequence, and the dummy fiber (25) is abutted against the incident fiber (21).

5. The DWDM device with a channel spacing of 50 GHz as claimed in claim 1, characterized in that: The housing (1) comprises an inner tube (11), a connecting piece (12) and an outer tube (13); The inner wall of one end of the connecting piece (12) is sleeved with the outer wall of the inner tube (11), and the inner wall of the outer tube (13) is sleeved with the outer wall of the other end of the connecting piece (12); the inner tube (11), the connecting piece (12) and the outer tube (13) form the mounting cavity (1a), and the opening (1a1) is formed at one end of the inner tube (11) away from the outer tube (13).

6. The DWDM device with a channel spacing of 50 GHz as claimed in claim 5, characterized in that: A boss (121) is formed on the outer wall of the connecting piece (12), and the boss (121) abuts against the outer tube (13) and gradually expands along the direction from the inner tube (11) to the outer tube (13).

7. The DWDM device with a channel spacing of 50 GHz as claimed in claim 1, characterized in that: The DWDM device with a channel spacing of 50 GHz further comprises a connecting sleeve (6), wherein the connecting sleeve (6) is located on a side of the collimator (3) facing away from the three-core optical fiber head (2) and is sleeved on the collimator (3); The 100 GHz filter (4) and the total reflector (5) are fixedly arranged in sequence on a side of the connecting sleeve (6) facing away from the collimator (3).

8. The DWDM device with a channel spacing of 50 GHz as claimed in claim 7, characterized in that: The DWDM device with a channel spacing of 50 GHz further comprises a first adhesive member (7) and a second adhesive member (8); The first adhesive component (7) is arranged at the connection between the connecting sleeve (6) and the 100 GHz filter (4), and the second adhesive component (8) is arranged at the connection between the 100 GHz filter (4) and the total reflector (5).

9. The DWDM device with a channel spacing of 50 GHz according to any one of claims 1 to 8, characterized in that: A first inclined surface (241) is formed at one end of the three-core optical fiber head (2) close to the collimator (3), and a second inclined surface (31) adapted to the first inclined surface (241) is formed at one end of the collimator (3) close to the three-core optical fiber head (2), and the first inclined surface (241) and the second inclined surface (31) are arranged opposite to each other.

10. The DWDM device with a channel spacing of 50 GHz according to any one of claims 1 to 8, characterized in that: The DWDM device with a channel spacing of 50 GHz further comprises a third adhesive component (9), and the third adhesive component (9) is arranged at the connection between the three-core optical fiber head (2) and the collimator (3).

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