16-channel wavelength division multiplexing equipment

Abstract

The utility model discloses 16-channel wavelength division multiplexing equipment, which comprises a first wavelength division multiplexer and a second wavelength division multiplexer, the first wavelength division multiplexer and the second wavelength division multiplexer are arranged on a base, and at least part of the surface of the same side of the first wavelength division multiplexer and the second wavelength division multiplexer is provided with a reflecting layer. The other side of the first wavelength division multiplexer and the other side of the second wavelength division multiplexer are each provided with two sets of monochromatic light path channels which are arranged at intervals, so that one beam of composite light is divided into four monochromatic light paths to be output from the monochromatic light path channels after passing through the first light window. The third wavelength division multiplexer is arranged on the base, is positioned on one side close to the first light inlet window, and is used for combining the four paths of composite light combined by the first wavelength division multiplexer and the second wavelength division multiplexer into one path of composite light; and the filters are arranged on the first wavelength division multiplexer, the second wavelength division multiplexer and the third wavelength division multiplexer.

Description

Technical Field

[0001] The utility model relates to the technical field of wavelength division multiplexers, in particular to a 16-channel wavelength division multiplexing device. Background Art

[0002] We call this method wavelength division multiplexing (WDM). At the transmitting end, the optical signals of different wavelengths are combined by a multiplexer (MUX) and coupled to the same optical fiber for transmission. At the receiving end, the light of various wavelengths is separated by a demultiplexer (DEMUX), and then further processed by the optical receiver to restore the original signal. Wavelength division multiplexing technology can realize the transmission of multiple wavelength signals on a single optical fiber, which will multiply the transmission capacity of optical fiber and is widely used in data centers and 5G communications.

[0003] When using current wavelength division multiplexing components, the number of channels is limited and the performance of low insertion loss, low crosstalk and high return loss cannot be achieved, which does not meet the usage needs in the market.

[0004] Therefore, a 16-channel wavelength division multiplexing device is still needed to solve the above problems. Utility Model Content

[0005] The utility model provides a 16-channel wavelength division multiplexing device for solving the above problems.

[0006] The purpose of the utility model is achieved by the following technical solutions:

[0007] Base;

[0008] A first wavelength division multiplexer and a second wavelength division multiplexer, wherein the first wavelength division multiplexer and the second wavelength division multiplexer are arranged on a base, at least a portion of the surface of the same side of the first wavelength division multiplexer and the second wavelength division multiplexer is provided with a reflective layer and a first light-transmitting window for four paths of monochromatic light to pass through, and the other side of the first wavelength division multiplexer and the second wavelength division multiplexer are both provided with two groups of spaced monochromatic light path channels, so that a beam of composite light is divided into four paths of monochromatic light after passing through a first light-transmitting window and output from the monochromatic light path channels;

[0009] A third wavelength division multiplexer, which is arranged on the base and located on a side close to the first light-transmitting window, and is used to combine the four paths of composite light after being combined by the first wavelength division multiplexer and the second wavelength division multiplexer into one path of composite light, or to divide the one path of composite light into four paths of composite light for input toward the first wavelength division multiplexer and the second wavelength division multiplexer, and the third wavelength division multiplexer is a 1*4 Z-shaped wavelength division multiplexer, and a high-reflection film and a second light-transmitting window are provided on a side of the third wavelength division multiplexer away from the first wavelength division multiplexer;

[0010] A filter, which is arranged on the first wavelength division multiplexer, the second wavelength division multiplexer and the third wavelength division multiplexer, corresponding to the side wall where the monochromatic light path channel is located, and is used to filter part of the light;

[0011] The optical fiber head is arranged on the base and is used for receiving the composite light output by the third wavelength division multiplexer, or outputting the composite light toward the third wavelength division multiplexer.

[0012] In one embodiment, the first wavelength division multiplexer and the second wavelength division multiplexer are 2*4Z-type wavelength division multiplexers, and the reflective layer is a high-reflective film formed on the side walls of the first wavelength division multiplexer and the second wavelength division multiplexer;

[0013] The third wavelength division multiplexer is a 1*4 Z-shaped wavelength division multiplexer, and a high-reflection film and a second light-transmitting window are provided on a side of the third wavelength division multiplexer away from the first wavelength division multiplexer;

[0014] The number of filters on the first wavelength division multiplexer and the second wavelength division multiplexer is 8 respectively, and the number of filters on the third wavelength division multiplexer is 4.

[0015] In one embodiment, the first wavelength division multiplexer and the second wavelength division multiplexer are 2*4Z-type wavelength division multiplexers, and the reflective layer is a high-reflective film formed on the side walls of the first wavelength division multiplexer and the second wavelength division multiplexer;

[0016] The number of filters on the first wavelength division multiplexer and the second wavelength division multiplexer is 8 respectively, and the number of filters on the third wavelength division multiplexer is 4.

[0017] In one embodiment, a displacement prism is further included. The displacement prism is arranged on the transmission path of the light and is located between the first wavelength division multiplexer and the third wavelength division multiplexer, and is located between the first wavelength division multiplexer and the third wavelength division multiplexer, and is used to translate part of the input light path and then output it.

[0018] In one embodiment, the isolator includes a Faraday rotator, a U-shaped magnet and two polarizers, wherein the polarizers are fixed on both sides of the Faraday rotator, and the U-shaped magnet is sleeved on the outer wall of the Faraday rotator.

[0019] In one embodiment, a collimator is further included. The collimator is disposed on the base and located between the optical fiber head and the third wavelength division multiplexer, and is used to emit composite light toward the third wavelength division multiplexer or receive composite light emitted by the third wavelength division multiplexer.

[0020] In one embodiment, the end face of the optical fiber head is a polished surface, and an anti-reflection film is coated on the polished surface.

[0021] In one embodiment, filter films are provided between the filter and the first wavelength division multiplexer, between the filter and the second wavelength division multiplexer, and between the filter and the third wavelength division multiplexer.

[0022] The device also includes a ball lens, which is disposed on the base and located between the collimator and the third wavelength division multiplexer, and is used to collect light onto the collimator.

[0023] Compared with the prior art, the beneficial effects of the present invention include at least:

[0024] The utility model design includes a two-stage wavelength division multiplexer. When the optical fiber head inputs an optical signal toward the wavelength division multiplexer, the composite light emitted by the optical fiber head passes through the wavelength division of the optical path of the third wavelength division multiplexer as the first-level wavelength division. One path of composite light is input from a side window of the third wavelength division multiplexer, and is divided into 4 paths of composite light after reflection inside the third wavelength division multiplexer. Then the 4 paths of composite light are divided into two groups. One group of two paths of composite light is respectively emitted to windows at different positions on the first wavelength division multiplexer or the second wavelength division multiplexer, and 4 paths of monochromatic light are output through one window. The whole process is divided into 16 paths of monochromatic light through the first wavelength division multiplexer and the second wavelength division multiplexer. The first stage adopts two 2x4 8-channel Z-Blocks instead of 1x8 Z-Block, with the purpose of reducing the number of reflections of each path. The smaller the number of reflections, the more controllable the angle is, and the problem of worsening the angle and the light output position of the light due to the accumulation of multiple reflections will not be caused. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Figure 2 This is a perspective structural schematic diagram of an embodiment of the utility model with the coating material removed;

[0027] Figure 3 This is another perspective structural schematic diagram of the embodiment of the utility model with the coating material removed;

[0028] Figure 4 It is an exploded view of an embodiment of the utility model;

[0029] Figure 5It is a schematic diagram of the structure of the limit assembly of an embodiment of the utility model.

[0030] In the figure: 1. base; 2. first wavelength division multiplexer; 3. second wavelength division multiplexer; 4. third wavelength division multiplexer; 5. filter; 6. optical fiber head; 7. displacement prism; 8. isolator; 81. Faraday rotator; 82. polarizer; 9. collimator; 10. filter film; 11. ball lens; 12. high reflection film; 13. first light-transmitting window; 14. second light-transmitting window. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0032] The words expressing positions and directions described in the present utility model are all explained by taking the drawings as examples, but they can be changed as needed, and all the changes are included in the protection scope of the present utility model.

[0033] Reference Figure 1-5 The utility model provides a 16-channel wavelength division multiplexing device, including: a base 1, a first wavelength division multiplexer 2, a second wavelength division multiplexer 3, a filter 5, a third wavelength division multiplexer 4, and an optical fiber head 6. The base 1 can be glass, ceramic or metal, and the shape of the base 1 is a plate-like structure. The first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 are two 2*4Z-shaped wavelength division multiplexers arranged in parallel, and the model size is the same. The structure of the third wavelength division multiplexer 4 is a 1*4Z-type wavelength division multiplexer.

[0034] The first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 are arranged on the base 1, and at least part of the surface of the same side of the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 is provided with a reflective layer and a first light-transmitting window 13 for four monochromatic lights to pass through. The other side of the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 are provided with two groups of spaced monochromatic light paths, so that a beam of composite light passes through a first light-transmitting window 13 and is divided into four monochromatic lights and output from the monochromatic light paths. The first wavelength division multiplexer 2 and the second wavelength division multiplexer 3. The first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 are provided with a reflective layer on the same side, wherein the reflective layer is, for example, a high-reflective film 12 plated on one side of the wavelength division multiplexer, wherein the high-reflective film 12 can also be a metal reflective film or an all-dielectric reflective film, which is not limited here. Two first transparent windows are provided on one side of the first wavelength division multiplexer 2, and the first transparent windows can be the side wall portion with the high-reflective film 12 removed.

[0035] The third wavelength division multiplexer 4 is arranged on the base 1 and is located on a side close to the first light-transmitting window 13. It is used to merge the four composite lights after passing through the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 into one composite light, or to divide the one composite light into four composite lights for input toward the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3. The third wavelength division multiplexer 4 is a 1*4 Z-shaped wavelength division multiplexer. A high-reflection film 12 and a second light-transmitting window 14 are provided on the side of the third wavelength division multiplexer 4 away from the first wavelength division multiplexer.

[0036] The filter 5 is arranged on the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3, corresponding to the side wall where the monochromatic optical path channel is located, and is used to filter part of the light. The third wavelength division multiplexer 4 is arranged on the base 1, and is used to merge the four combined composite lights into one composite light, or to divide one composite light into four composite lights. The optical fiber head 6 is arranged on the base 1, and is used to receive the composite light output by the third wavelength division multiplexer 4, or to output the composite light toward the third wavelength division multiplexer 4. When the monochromatic light passes through the filter 5, part of the light that is not within the wavelength range is blocked, and the filtered light is reflected in the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3, and then reflected by the filter 5 at other positions, and finally irradiated toward the filter 5 of the third wavelength division multiplexer 4 after multiple Z-shaped reflections, and then reflected multiple times inside the third wavelength division multiplexer 4 and finally irradiated toward the optical fiber from the second light window.

[0037] The wavelength division multiplexer can output from the optical fiber and be divided into 16 monochromatic lights through wavelength division, or it can input 16 monochromatic lights and output composite light from the optical fiber after compounding. The number of reflections of each path is reduced, and the angle is more controllable with a small number of reflections, which will not cause the problem of poor light angle and light output position due to the accumulation of multiple reflections.

[0038] In one embodiment, the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 are 2*4Z-type wavelength division multiplexers, and the reflective layer is a high-reflective film 12 formed on the side walls of the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3. The high-reflective film 12 is an optical film with a reflective function, which is not listed here one by one.

[0039] The number of filters 5 on the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 is 8 respectively, and the number of filters 5 on the third wavelength division multiplexer 4 is 4. The first wavelength division multiplexer 2 and the second wavelength division multiplexer 3 respectively have two groups of monochromatic optical path channels, and the number of a group of monochromatic optical path channels is 4 optical paths, and each optical path is only for light of one wavelength to pass.

[0040] Reference Figure 1For example, from top to bottom, the models of filter 5 are respectively for allowing monochromatic light with a wavelength of 11271mm to pass through, monochromatic light with a wavelength of 21291mm to pass through, monochromatic light with a wavelength of 31311mm to pass through, monochromatic light with a wavelength of 41331mm to pass through, monochromatic light with a wavelength of 51351mm to pass through, monochromatic light with a wavelength of 61371mm to pass through, monochromatic light with a wavelength of 71391mm to pass through, and monochromatic light with a wavelength of 81411mm to pass through.

[0041] In a specific embodiment, the 16-channel wavelength division multiplexing device also includes a displacement prism 7, which is arranged on the transmission path of the light and is located between the first wavelength division multiplexer 2 and the third wavelength division multiplexer 4, and is located between the first wavelength division multiplexer 2 and the third wavelength division multiplexer 4, and is used to translate part of the input optical path and then output it. When multiple monochromatic lights are irradiated toward the first wavelength division multiplexer 2 and the second wavelength division multiplexer 3, the displacement prism 7 can translate the first-level wavelength division multiplexing output by the first wavelength division multiplexing and the second wavelength division multiplexing 3 in a horizontal position by a certain distance, so that the first wavelength division multiplexing is accurately injected into the third wavelength division multiplexer 4, and finally injected into the optical fiber after the second wavelength division multiplexing. The flexibility is better, the accuracy of the optical path is improved, and the third wavelength division multiplexer 4 is prevented from being bulky to adapt to the wavelength division multiplexing of the optical path.

[0042] In one embodiment, the 16-channel wavelength division multiplexing device further includes an isolator 8, which is disposed between the displacement prism 7 and the first wavelength division multiplexer 2, and / or between the displacement prism 7 and the second wavelength division multiplexer 3, and is used to block the reflected high-frequency signal light from being directed toward the light source. The isolator 8 can prevent the high-frequency signal light from returning to the laser, so that the high-frequency signal light can only achieve a single-way conduction when passing through the isolator 8, thereby avoiding affecting the source of the emitted optical signal after reflection and causing damage to components.

[0043] In one embodiment, further, the isolator 8 includes a Faraday rotator 81, a U-shaped magnet and two polarizers 82, wherein the polarizers 82 are fixed on both sides of the Faraday rotator 81, and the U-shaped magnet is sleeved on the outer wall of the Faraday rotator 81. A polarization direction marking groove is also provided on the polarizer 82, one is a 0° polarizer 82, and the other is a 45° polarizer 82, and the Faraday rotation is also 45°, and the above angle is the angle between the polarization direction and the horizontal plane. In the forward direction, the light just passes through, realizing the unidirectional conduction of the optical path, and the reverse closure function is to prevent the light irradiation reflection from damaging the laser.

[0044] In another embodiment, a collimator 9 is further included, which is disposed on the base 1 and located between the optical fiber head 6 and the third wavelength division multiplexer 4, and is used to emit composite light toward the third wavelength division multiplexer 4, or receive composite light emitted by the third wavelength division multiplexer 4, so as to couple the light into the required device with maximum efficiency or receive the optical signal with maximum efficiency.

[0045] In one embodiment, the end face of the optical fiber head 6 is a polished surface, and the polished surface is coated with an anti-reflection film. The surface coating of the anti-reflection film achieves low insertion loss, reduces the loss of optical signals during transmission, and improves transmission efficiency.

[0046] In one embodiment, a filter film 10 is provided between the filter 5 and the first wavelength division multiplexer 2, the filter 5 and the second wavelength division multiplexer 3, and the filter 5 and the third wavelength division multiplexer 4. The filter film 10 can only allow light of a specified wavelength to pass through, and light of different wavelengths will be reflected, thereby stably controlling light of different wavelengths to be output from the same output position after multiple reflections.

[0047] In one embodiment, a ball lens 11 is further included, which is disposed on the base 1 and located between the collimator 9 and the third wavelength division multiplexer 4, and is used to collect light onto the collimator 9. The ball lens 11 collects and concentrates the composite multi-point irradiated light in parallel, and then accurately irradiates the collimator 9, thereby playing a collecting role.

[0048] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the utility model. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the utility model without departing from the principles and purpose of the utility model. All of these changes should fall within the scope of protection of the claims of the utility model.

Claims

1. A 16-channel wavelength division multiplexing device, characterized in that: include: Base; A first wavelength division multiplexer and a second wavelength division multiplexer, wherein the first wavelength division multiplexer and the second wavelength division multiplexer are arranged on a base, at least a portion of the surface of the same side of the first wavelength division multiplexer and the second wavelength division multiplexer is provided with a reflective layer and a first light-transmitting window for four paths of monochromatic light to pass through, and the other side of the first wavelength division multiplexer and the second wavelength division multiplexer are both provided with two groups of spaced monochromatic light path channels, so that a beam of composite light is divided into four paths of monochromatic light after passing through a first light-transmitting window and output from the monochromatic light path channels; A third wavelength division multiplexer, which is arranged on the base and located on a side close to the first light-transmitting window, and is used to combine the four paths of composite light after being combined by the first wavelength division multiplexer and the second wavelength division multiplexer into one path of composite light, or to divide the one path of composite light into four paths of composite light for input toward the first wavelength division multiplexer and the second wavelength division multiplexer, and the third wavelength division multiplexer is a 1*4 Z-shaped wavelength division multiplexer, and a high-reflection film and a second light-transmitting window are provided on a side of the third wavelength division multiplexer away from the first wavelength division multiplexer; A filter, which is arranged on the first wavelength division multiplexer, the second wavelength division multiplexer and the third wavelength division multiplexer, corresponding to the side wall where the monochromatic light path channel is located, and is used to filter part of the light; The optical fiber head is arranged on the base and is used for receiving the composite light output by the third wavelength division multiplexer, or outputting the composite light toward the third wavelength division multiplexer.

2. The 16-channel wavelength division multiplexing device according to claim 1, characterized in that: The first wavelength division multiplexer and the second wavelength division multiplexer are 2*4Z type wavelength division multiplexers, and the reflective layer is a high reflection film formed on the side walls of the first wavelength division multiplexer and the second wavelength division multiplexer; The number of filters on the first wavelength division multiplexer and the second wavelength division multiplexer is 8 respectively, and the number of filters on the third wavelength division multiplexer is 4.

3. The 16-channel wavelength division multiplexing device according to claim 2, characterized in that: It also includes a displacement prism, which is arranged on the transmission path of the light and located between the first wavelength division multiplexer and the third wavelength division multiplexer, and is located between the first wavelength division multiplexer and the third wavelength division multiplexer, and is used to translate part of the input light path and then output it.

4. The 16-channel wavelength division multiplexing device according to claim 3, characterized in that: It also includes an isolator, which is arranged between the displacement prism and the first wavelength division multiplexer, and / or between the displacement prism and the second wavelength division multiplexer, and is used to block the reflected high-frequency signal light from being directed toward the light source.

5. The 16-channel wavelength division multiplexing device according to claim 4, characterized in that: The isolator comprises a Faraday rotator, a U-shaped magnet and two polarizing plates, wherein the polarizing plates are fixed on both sides of the Faraday rotator, and the U-shaped magnet is sleeved on the outer wall of the Faraday rotator.

6. The 16-channel wavelength division multiplexing device according to claim 1 or 5, characterized in that: It also includes a collimator, which is arranged on the base and located between the optical fiber head and the third wavelength division multiplexer, and is used to emit composite light toward the third wavelength division multiplexer or receive composite light emitted by the third wavelength division multiplexer.

7. The 16-channel wavelength division multiplexing device according to claim 1, characterized in that: The end face of the optical fiber head is a polished surface, and an anti-reflection film is coated on the polished surface.

8. The 16-channel wavelength division multiplexing device according to claim 1, characterized in that: Filter films are arranged between the filter and the first wavelength division multiplexer, between the filter and the second wavelength division multiplexer, and between the filter and the third wavelength division multiplexer.

9. The 16-channel wavelength division multiplexing device according to claim 1, characterized in that: The device also includes a ball lens, which is disposed on the base and located between the collimator and the third wavelength division multiplexer, and is used for converging the light onto the collimator.

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