DWDM device with channel interval of 50GHz

Abstract

The utility model 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 round trip 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 utility model relates to optical fiber communication technical field, especially interchannel interval 50GHz's DWDM device. BACKGROUND

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

[0003] And the channel interval of 50G DWDM is 0.4nm, compared with 100G DWDM, 50G DWDM can distribute more channels in C waveband to improve the utilization rate of channel. However, due to the extremely narrow channel interval of 50G DWDM, the cost of producing 50G DWDM filter piece through coating technology is high and the realization difficulty is great, and the process operability is weak.

[0004] In the related art, a scheme for realizing 50G DWDM by using 100G DWDM filter is proposed. The scheme needs to use two 100G DWDM devices in series to make a module box. Since two 100G DWDM devices are needed in series, the module box has the problems of large volume and high cost. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a kind of interchannel interval 50GHz's DWDM device, to reduce the volume occupation and cost of 50G DWDM.

[0006] To achieve the above purpose, the interchannel interval 50GHz's DWDM device provided by the utility model includes shell, three-core optical fiber head, collimator, 100GHz filter and full reflection light device, the shell is formed with installation cavity with opening;The three-core optical fiber head is inserted in the opening;The collimator is arranged in the installation cavity and connected with the three-core optical fiber head;The 100GHz filter is arranged corresponding to the collimator and located on the side of the collimator away from the three-core optical fiber head;The full reflection light device is arranged on the side of the 100GHz filter away from the collimator.

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

[0008] In an embodiment, an access channel is formed in the access connector and extends through the access connector, the access channel comprises an insertion section, a contraction section, and a fixing section which are sequentially connected; the insertion section is arranged at the end of the connector away from the mounting cavity, the fixing section is arranged at the end of the connector facing the mounting cavity, and the contraction section gradually contracts in the direction from the insertion section to the fixing section; the incident fiber, the reflection fiber, and the 50GHz transmission fiber sequentially pass through the insertion section and the contraction section and are inserted into the inner wall of the fixing section.

[0009] In an embodiment, the three-core fiber head further comprises a dummy fiber, the incident fiber, the 50GHz transmission fiber, the reflection fiber, and the dummy fiber are distributed along the circumference of the fixing section and are inserted into the inner wall of the fixing section, the incident fiber, the 50GHz transmission fiber, the reflection fiber, and the dummy fiber sequentially abut, and the dummy fiber abuts the incident fiber.

[0010] In an embodiment, the housing comprises 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, the inner wall of the outer tube is sleeved with the outer wall of the other end of the connecting piece, the mounting cavity is formed in the inner tube, the connecting piece, and the outer tube, and the opening is formed at the end of the inner tube away from the outer tube.

[0011] In an embodiment, the outer wall of the connecting piece is formed with a boss, the boss abuts the outer tube and gradually expands in the direction from the inner tube to the outer tube.

[0012] In an embodiment, the DWDM device with channels spaced by 50GHz further comprises a connecting sleeve, the connecting sleeve is located at the side of the collimator away from the three-core fiber head and is sleeved with the collimator; the 100GHz filter and the full reflection optical device are sequentially arranged at the side of the connecting sleeve away from the collimator.

[0013] In an embodiment, the DWDM device with channels spaced by 50GHz further comprises a first adhesive and a second adhesive; the first adhesive is arranged at the connection between the connecting sleeve and the 100GHz filter, and the second adhesive is arranged at the connection between the 100GHz filter and the full reflection optical device.

[0014] In an embodiment, the three-core fiber head is formed with a first inclined surface near one end of the collimator, the collimator is formed with a second inclined surface matching the first inclined surface near one end of the three-core fiber head, and the first inclined surface is arranged opposite to the second inclined surface.

[0015] In an embodiment, the DWDM device with 50GHz channel spacing further comprises a third adhesive arranged at the connection between the three-core fiber head and the collimator.

[0016] The DWDM device with 50GHz channel spacing comprises a shell, a three-core fiber head, a collimator, a 100GHz filter and a full reflection reflector. The shell is formed with a mounting cavity with an opening. The three-core fiber head is inserted into the opening. The collimator is arranged in the mounting cavity and connected with the three-core fiber head. The 100GHz filter is arranged corresponding to the collimator and located on the side of the collimator away from the three-core fiber head. The full reflection reflector is arranged on the side of the 100GHz filter away from the collimator. The optical signal input by the three-core fiber head passes through the 100GHz filter for the first time to reach the full reflection reflector, passes through the 100GHz filter for the second time after being reflected by the full reflection reflector, and is output from the three-core fiber head after passing through the collimator. In this way, the full reflection reflector is arranged to make the optical signal pass through the same 100GHz filter twice for coupling to obtain a 50GHz wavelength channel. Compared with the scheme of two 100G DWDM devices connected in series, the volume occupation and cost of the 50G DWDM device are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor based on the drawings shown.

[0018] Figure 1 The exploded view of the DWDM device with 50GHz channel spacing provided by the present application is shown in the embodiment.

[0019] Figure 2 The top view of the DWDM device with 50GHz channel spacing provided by the present application is shown in the embodiment.

[0020] Figure 3 The Figure 2 The cross-sectional view along line A-A' is shown in the embodiment.

[0021] Figure 4 The Figure 3 The structural schematic view of the shell is shown in the embodiment.

[0022] Figure 5 For Figure 3 The structure schematic diagram of the access device in the middle;

[0023] Figure 6 For Figure 1 The assembly schematic diagram of the access device and the inner tube in the middle;

[0024] Figure 7 For Figure 6 The sectional view along the line B-B' in the middle;

[0025] Figure 8 For Figure 7 The local enlarged view of C in the middle;

[0026] Figure 9 The transmission spectrum offset superposition diagram of the channel spacing 50GHz DWDM device of the utility model.

[0027] Explanation of the attached drawing number:

[0028] 100, channel spacing 50GHz DWDM device;

[0029] 1, shell; 1a, mounting cavity; 1a1, opening; 11, inner tube; 12, connecting piece; 121, boss; 13, outer tube; 2, three-core optical fiber head; 21, incident fiber; 22, reflecting fiber; 23, 50GHz transmission fiber; 24, access device; 241, first inclined surface; 24a, access channel; 24a1, insertion section; 24a2, contraction section; 24a3, fixed section; 25, dummy fiber; 3, collimator; 31, second inclined surface; 4, 100GHz filter; 5, full reflection optical device; 6, connecting sleeve; 7, first adhesive; 8, second adhesive; 9, third adhesive.

[0030] The realization, functional features and advantages of the utility model will be further described by combining with the embodiments and referring to the attached drawings. Specific implementation

[0031] The technical scheme in the embodiments of the utility model will be clearly and completely described by combining with the attached drawings of the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0032] It should be noted that if the embodiment of the utility model has the directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture, if the specific posture changes, then the directionality indication also changes accordingly.

[0033] In addition, if the embodiment of the utility model has the description of "first", "second" and the like, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the whole text, its meaning includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0034] The utility model provides a kind of DWDM device 100 with channel interval 50GHz.

[0035] Please refer to Figures 1 to 4 In an embodiment of the utility model, the DWDM device 100 with channel interval 50GHz includes shell 1, three-core fiber head 2, collimator 3, 100GHz filter 4 and full reflection light device 5, shell 1 is formed with installation cavity 1a with opening 1a1;Three-core fiber head 2 is inserted in opening 1a1;Collimator 3 is located in installation cavity 1a and is connected with three-core fiber head 2;100GHz filter 4 is arranged corresponding collimator 3 and is located at the side of collimator 3 away from three-core fiber head 2;Full reflection light device 5 is located at the side of 100GHz filter 4 away from collimator 3.

[0036] In the embodiment, the shell 1 is used for packaging the three-core fiber head 2, the collimator 3, the 100GHz filter 4 and the total reflection mirror 5 and plays a protection role, and the shell 1 can adopt a glass tube. The shell 1 is formed with a mounting cavity 1a, and the shell 1 is further provided with an opening 1a1 in communication with the mounting cavity 1a, and the mounting cavity 1a is in a strip shape, for example, the shell 1 can adopt a single-port glass tube. The three-core fiber head 2 is inserted into the opening 1a1 and is in sealing connection with the inner wall of the opening 1a1, for example, an adhesive can be used to bond the outer wall of the three-core fiber head 2 with the inner wall of the opening 1a1. The mounting cavity 1a is sequentially provided with the collimator 3, the 100GHz filter 4 and the total reflection mirror 5, the collimator 3 is connected with the three-core fiber head 2, and the three-core fiber head 2, the collimator 3, the 100GHz filter 4 and the total reflection mirror 5 are coaxially arranged.

[0037] In the embodiment, the shell 1 is used for packaging the three-core fiber head 2, the collimator 3, the 100GHz filter 4 and the total reflection mirror 5 and plays a protection role, and the shell 1 can adopt a glass tube. The shell 1 is formed with a mounting cavity 1a, and the shell 1 is further provided with an opening 1a1 in communication with the mounting cavity 1a, and the mounting cavity 1a is in a strip shape, for example, the shell 1 can adopt a single-port glass tube. The three-core fiber head 2 is inserted into the opening 1a1 and is in sealing connection with the inner wall of the opening 1a1, for example, an adhesive can be used to bond the outer wall of the three-core fiber head 2 with the inner wall of the opening 1a1. The mounting cavity 1a is sequentially provided with the collimator 3, the 100GHz filter 4 and the total reflection mirror 5, the collimator 3 is connected with the three-core fiber head 2, and the three-core fiber head 2, the collimator 3, the 100GHz filter 4 and the total reflection mirror 5 are coaxially arranged.

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

[0039] The 50GHz DWDM device 100 of the embodiment is coupled by setting the full reflection mirror so that the optical signal passes through the same 100GHz filter 4 twice in the process of going back and forth to obtain the 50GHz wavelength channel, compared with the scheme of two 100G DWDM devices in series, the beneficial effects of reducing the volume occupation and cost of the 50G DWDM are achieved. And the shell 1 of glass tube and other materials is adopted for packaging, the module box packaging step is avoided, in addition to smaller volume occupation, the packaging step is simpler, and industrialized production is easier to realize.

[0040] Further, please refer to Figures 1 to 3 In an embodiment of the utility model, three core optical fiber head 2 includes incident fiber 21, reflection fiber 22, 50GHz transmission fiber 23 and access ware 24, access ware 24 is inserted in opening 1a1, incident fiber 21, reflection fiber 22 and 50GHz transmission fiber 23 are all inserted into access ware 24 from the side of access ware 24 facing away from installation cavity 1a, collimator 3 is connected with the side of access ware 24 facing installation cavity 1a.

[0041] In the embodiment, three core optical fiber head 2 includes incident fiber 21, reflection fiber 22, 50GHz transmission fiber 23, incident fiber 21 is used to input optical signal, can include all wavelength range optical signal, 50GHz transmission fiber 23 is used to output the required 50GHz optical signal, reflection fiber 22 is used to output the filtered remaining optical signal.

[0042] Three core optical fiber head 2 also includes access ware 24, access ware 24 is used to realize the connection and fixation of incident fiber 21, reflection fiber 22 and 50GHz transmission fiber 23 in the shell, and is connected with collimator 3. The outer wall of access ware 24 is sealingly connected with the inner wall of opening 1a1 of shell 1.

[0043] Further, please refer to Figures 3 to 5 In an embodiment of the utility model, access channel 24a is formed in access ware 24, and the access channel 24a includes insertion section 24a1, contraction section 24a2 and fixed section 24a3 which are sequentially communicated, insertion section 24a1 is arranged at the end of the connector away from installation cavity 1a, fixed section 24a3 is arranged at the end of the connector facing installation cavity 1a, contraction section 24a2 gradually contracts along the direction from insertion section 24a1 to fixed section 24a3, incident fiber 21, reflection fiber 22 and 50GHz transmission fiber 23 sequentially pass through insertion section 24a1 and contraction section 24a2 and are inserted with the inner wall of fixed section 24a3.

[0044] In the embodiment, the access device 24 is formed with an access channel 24a penetrating through the access device 24, the access channel 24a comprising an insertion section 24a1, a contraction section 24a2 and a fixing section 24a3 connected in sequence, the inner diameter of the insertion section 24a1 is larger than that of the fixing section 24a3, the contraction section 24a2 connects the insertion section 24a1 and the fixing section 24a3 for realizing uniform transition of the two and guiding the insertion of the optical fibers, the fixing section 24a3 is used for containing the incident fiber 21, the reflecting fiber 22 and the 50GHz transmission fiber 23, and the inner wall of the fixing section 24a3 is tightly pressed against the inserted incident fiber 21, reflecting fiber 22 and 50GHz transmission fiber 23 for fixing. After the incident fiber 21, the reflecting fiber 22 and the 50GHz transmission fiber 23 are inserted into the access channel 24a and fixed, epoxy resin can be filled in the access channel 24a for further realizing the cementation of the incident fiber 21, the reflecting fiber 22 and the 50GHz transmission fiber 23 with the access device 24, so as to strengthen the structural strength of the whole and prevent the incident fiber 21, the reflecting fiber 22 and the 50GHz transmission fiber 23 from being separated from the access channel 24a.

[0045] Specifically, refer to Figures 6 to 8 In the embodiment, the three-core optical fiber head 2 further comprises a dummy fiber 25, the incident fiber 21, the 50GHz transmission fiber 23, the reflecting fiber 22 and the dummy fiber 25 are distributed along the circumference of the fixing section 24a3 and are inserted into the fixing section 24a3, the incident fiber 21, the 50GHz transmission fiber 23, the reflecting fiber 22 and the dummy fiber 25 abut in sequence, and the dummy fiber 25 abuts against the incident fiber 21.

[0046] In the embodiment, the cross section of the fixing section 24a3 is square, the side length of the square is 250um, the diameters of the incident fiber 21, the 50GHz transmission fiber 23, the reflecting fiber 22 and the dummy fiber 25 are 125um, the incident fiber 21, the 50GHz transmission fiber 23, the reflecting fiber 22 and the dummy fiber 25 abut in sequence, the dummy fiber 25 abuts against the incident fiber 21, and the incident fiber 21, the 50GHz transmission fiber 23, the reflecting fiber 22 and the dummy fiber 25 are inserted into the fixing section 24a3. The dummy fiber 25 is a small section of optical fiber and does not transmit signals, but only supports the incident fiber 21, the 50GHz transmission fiber 23 and the reflecting fiber 22 to be firmly inserted into the fixing section 24a3. The center distance between the incident fiber 21 and the 50GHz transmission fiber 23 is d1, d1 is 125um, and the center distance between the incident fiber 21 and the reflecting fiber 22 is d2, d2 is 177um.

[0047] It should be explained that the light signal inputted by the three-core fiber head 2 is straightened by the collimator 3, and then reaches the total reflector 5 after passing through the 100GHz filter 4. The 100GHz filter 4 filters part of the noise, and the distance between the incident fiber 21 and the reflecting fiber 22 is 177um, which is a designed distance for generating a specific wavelength shift. The coupling center wavelength is adjusted to ITU standard wavelength channel minus 0.155nm (ITU-0.155nm). This means that the light signal passing through the first 100GHz filter 4 has been selected on the ITU standard wavelength channel, but slightly offset by -0.155nm. The light signal is reflected by the total reflector and then passes through the 100GHz filter 4 again. This time, the center distance between the incident fiber 21 and the 50GHz transmission fiber 23 is 125um, which will cause another specific wavelength shift of the light signal when passing through the optical fiber. The wavelength shift is set to ITU standard wavelength channel plus 0.155nm (ITU+0.155nm). When the offset light signal and the light signal passing through the filter last time (ITU-0.155nm) are superimposed, the interval between the two wavelength channels is halved, thereby forming a 50GHz wavelength interval channel, that is, the superposition of the short wave (ITU-0.155nm) and the long wave (ITU+0.155nm) offset forms a 50GHz wavelength interval (ITU) channel, which can be referred to as Figure 9 By this method, the 100GHz filter 4 and the total reflector 5 and other optical components can be used to realize a more dense 50GHz DWDM channel through wavelength shift and superposition, thereby improving the transmission capacity of the optical fiber network.

[0048] Further, please refer to Figures 3 to 4 In an embodiment of the utility model, the shell 1 includes inner tube 11, connecting piece 12 and outer tube 13, the inner wall of one end of connecting piece 12 is sleeved with the outer wall of inner tube 11, the inner wall of outer tube 13 is sleeved with the outer wall of the other end of connecting piece 12, and the mounting cavity 1a is formed in inner tube 11, connecting piece 12 and outer tube 13, and the end of inner tube 11 away from outer tube 13 forms opening 1a1.

[0049] In the embodiment, in order to facilitate assembly, the shell 1 is provided in three sections, the inner tube 11 and the outer tube 13 are made of glass tubes, the inner tube 11 is made of a double-bore glass tube, the outer tube 13 is made of a single-bore glass tube, and the connecting piece 12 can be made of a sealing sleeve. In assembly, first, the three-core fiber head 2 is inserted into the inner tube 11 and is sealingly connected to the inner tube 11 by means of glue or the like, then the connecting piece 12 is sleeved on the outer wall of the inner tube 11 and is sealingly connected by means of glue or the like, then the collimator 3, the 100GHz filter 4 and the total reflection mirror 5 are connected to one end of the three-core fiber head 2, and finally the collimator 3, the 100GHz filter 4 and the total reflection mirror 5 are inserted into the outer tube 13, and the inner wall of the outer tube 13 is sleeved on the outer wall of the connecting piece 12. The inner tube 11 and the outer tube 13 are made of glass, and the connecting piece 12 can be made of plastic or the like to realize sealing between the inner tube 11 and the outer tube 13. The inner tube 11, the connecting piece 12 and the outer tube 13 are coaxially arranged to facilitate industrialized assembly and production. It should be noted that the connecting piece 12 can also be made of an adhesive, i.e. the adhesive is used to connect the outer wall of the inner tube 11 and the inner wall of the outer tube 13, and the adhesive is infiltrated between the inner tube 11 and the outer tube 13 to ensure the sealing performance of the shell 1.

[0050] Further, referring to Figure 3 In an embodiment of the utility model, the outer wall of the connecting piece 12 is formed with a boss 121, the boss 121 abuts against the outer tube 13 and gradually expands in the direction from the inner tube 11 to the outer tube 13.

[0051] In the embodiment, the boss 121 is arranged on the connecting piece 12 to realize stop positioning when the outer tube 13 is sleeved on the connecting piece 12, and the boss 121 abuts against the outer tube 13 when 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 in the direction from the inner tube 11 to the outer tube 13 to make the outer profile size of the 50GHz channel interval DWDM device 100 gradually transition, reduce sharp corners on the shell 1, and facilitate integrated installation in the fiber communication equipment.

[0052] Further, referring to Figure 1 and Figure 3 In an embodiment of the utility model, the 50GHz channel interval DWDM device 100 further comprises a connecting sleeve 6, the connecting sleeve 6 is located on the side of the collimator 3 away from the three-core fiber head 2 and is sleeved on the collimator 3, and the 100GHz filter 4 and the total reflection mirror 5 are fixed on the side of the connecting sleeve 6 away from the collimator 3 in sequence.

[0053] In the embodiment, the inner diameter of the connecting sleeve 6 is matched with the outer diameter of the collimator 3, for example, the connecting sleeve 6 and the collimator 3 can be set as an interference fit or a clearance fit, so that the two can be fixed by the friction force and can be disassembled. The 100GHz filter 4 and the total reflector 5 are sequentially fixed on the side of the connecting sleeve 6 away from the collimator 3, and a sliding groove can be arranged on the side of the connecting sleeve 6 away from the collimator 3, the sliding groove is arranged along the radial direction of the connecting sleeve 6, the size of the sliding groove is matched with the 100GHz filter 4 and the total reflector 5, the 100GHz filter 4 and the total reflector 5 are tightly slid into the sliding groove along the radial direction of the connecting sleeve 6, and are fixed with the inner wall of the sliding groove by the friction force. The embodiment connects the 100GHz filter 4, the total reflector 5 and the collimator 3 through the connecting sleeve 6, avoids complex alignment steps, reduces the complexity and difficulty of assembly, and the connecting sleeve 6 and the collimator 3 can be disassembled to flexibly replace the 100GHz filter 4 and the total reflector 5, so that different filtering requirements can be met.

[0054] Further, referring to Figure 3 In an embodiment of the utility model, the DWDM device 100 with channel spacing of 50GHz further includes a first adhesive 7 and a second adhesive 8; the first adhesive 7 is arranged at the connecting position of the connecting sleeve 6 and the 100GHz filter 4, and the second adhesive 8 is arranged at the connecting position of the 100GHz filter 4 and the total reflector 5.

[0055] In the embodiment, the connecting sleeve 6, the 100GHz filter 4 and the total reflector 5 can be pre-assembled, and the three are connected as a whole through the first adhesive 7 and the second adhesive 8; the first adhesive 7 and the second adhesive 8 can be resin glue; the first adhesive 7 is arranged at the connecting position of the connecting sleeve 6 and the 100GHz filter 4, and the second adhesive 8 is arranged at the connecting position of the 100GHz filter 4 and the total reflector 5.

[0056] Further, referring to Figure 3 In an embodiment of the utility model, a first inclined surface 241 is formed at the end of the three-core fiber head 2 close to the collimator 3, a second inclined surface 31 matched with the first inclined surface 241 is formed at the end of the collimator 3 close to the three-core fiber head 2, and the first inclined surface 241 and the second inclined surface 31 are oppositely arranged.

[0057] In the embodiment, in order to reduce the direct reflection of optical signals at the interface, the first inclined surface 241 is arranged at the end of the three-core fiber head 2 close to the collimator 3, and the second inclined surface 31 matched with the first inclined surface 241 is arranged at the end of the collimator 3 close to the three-core fiber head 2, because the inclined surface can make the reflected light deviate from the original propagation path, thereby reducing the return (reflected light) to the light source or laser, which helps to maintain the stability of the signal.

[0058] Further, please refer to Figure 3 In the embodiment of the present application, the DWDM device 100 with channel spacing of 50GHz further comprises a third adhesive 9, which is arranged at the connecting position of the three-core fiber head 2 and the collimator 3.

[0059] In the embodiment, the third adhesive 9 surrounds the outer wall of the connecting position of the three-core fiber head 2 and the collimator 3, and there is an air gap between the three-core fiber head 2 and the collimator 3. The working range of the collimator 3 can be adjusted by adjusting the size of the air gap. After the air gap is adjusted, the third adhesive 9 connects the three-core fiber head 2 and the collimator 3 to lock the size of the air gap.

[0060] The above is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like, which is made based on the technical concept of the present application and the contents of the present application specification and drawings, is included in the patent protection scope of the present application.

Claims

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

2. The DWDM device of claim 1, wherein the channels are spaced 50 GHz apart. The three-core fiber head (2) comprises an incident fiber (21), a reflection fiber (22), a 50GHz 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 50GHz transmission fiber (23) are inserted into the access device (24) from the side of the access device (24) away from the mounting cavity (1a); the collimator (3) is connected with the side of the access device (24) facing the mounting cavity (1a).

3. The DWDM device of claim 2, wherein the channels are spaced 50 GHz apart. An access channel (24a) is formed in the access device (24) and penetrates the access device (24), and the access channel (24a) comprises an insertion section (24a1), a contraction section (24a2) and a fixing section (24a3) connected in sequence; the insertion section (24a1) is arranged at one end of the access device (24) away from the mounting cavity (1a), the fixing section (24a3) is arranged at one end of the access device (24) facing the mounting cavity (1a), and the contraction section (24a2) gradually contracts in the direction from the insertion section (24a1) to the fixing section (24a3); the incident fiber (21), the reflection fiber (22) and the 50GHz transmission fiber (23) penetrate the insertion section (24a1) and the contraction section (24a2) and are inserted into the inner wall of the fixing section (24a3).

4. The DWDM device of claim 3, wherein the channels are spaced 50 GHz apart. The three-core fiber head (2) further comprises a dummy fiber (25); the incident fiber (21), the 50GHz transmission fiber (23), the reflection fiber (22) and the dummy fiber (25) are distributed along the circumference of the fixing section (24a3) and are inserted into the inner wall of the fixing section (24a3), the incident fiber (21), the 50GHz transmission fiber (23), the reflection fiber (22) and the dummy fiber (25) abut in sequence, and the dummy fiber (25) abuts against the incident fiber (21).

5. The DWDM device of claim 1, wherein the channels are spaced 50 GHz apart. The housing (1) comprises an inner tube (11), a connecting piece (12) and an outer tube (13). An inner wall of one end of the connecting piece (12) is sleeved with an outer wall of the inner tube (11), an inner wall of the outer tube (13) is sleeved with an 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) inside, and the inner tube (11) is formed with the opening (1a1) at one end away from the outer tube (13).

6. The DWDM device of claim 5, wherein the channels are spaced 50 GHz apart. An outer wall of the connecting piece (12) is formed with a boss (121), the boss (121) abuts against the outer tube (13) and gradually expands in the direction from the inner tube (11) to the outer tube (13).

7. The DWDM device of claim 1, wherein the channels are spaced 50 GHz apart. The DWDM device with channel spacing of 50GHz further comprises a connecting sleeve (6) located on a side of the collimator (3) away from the three-core fiber head (2) and sleeved with the collimator (3); The 100GHz filter (4) and the full reflection mirror (5) are sequentially fixed on a side of the connecting sleeve (6) away from the collimator (3).

8. The DWDM device of claim 7, wherein the channels are spaced 50 GHz apart. The DWDM device with channel spacing of 50GHz further comprises a first adhesive (7) and a second adhesive (8); The first adhesive (7) is arranged at a connecting position of the connecting sleeve (6) and the 100GHz filter (4), and the second adhesive (8) is arranged at a connecting position of the 100GHz filter (4) and the full reflection mirror (5).

9. The DWDM device of any of claims 1 to 8, wherein the channels are spaced 50 GHz apart. An end of the three-core fiber head (2) close to the collimator (3) is formed with a first inclined surface (241), an end of the collimator (3) close to the three-core fiber head (2) is formed with a second inclined surface (31) matched with the first inclined surface (241), and the first inclined surface (241) and the second inclined surface (31) are oppositely arranged.

10. The DWDM device of any one of claims 1 to 8, wherein the channels are spaced 50 GHz apart. The DWDM device with channel spacing of 50GHz further comprises a third adhesive (9) arranged at a connecting position of the three-core fiber head (2) and the collimator (3). The DWDM device with channel spacing of 50GHz further comprises a third adhesive (9) arranged at a connecting position of the three-core fiber head (2) and the collimator (3).

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