Small wavelength division multiplexer

Abstract

The utility model discloses a miniature wavelength division multiplexer, and relates to the technical field of wavelength division multiplexers. The utility model discloses a small wavelength division multiplexer, which comprises a shell, a light filtering assembly, a collimator and a demultiplexing array piece, the light filtering assembly comprises a plurality of light filters which are arranged in the shell side by side, and each light filter is provided with a first plane and a second plane which are parallel to each other. The first plane of any optical filter coincides with the second plane of the adjacent optical filter, a first wavelength division multiplexing film is arranged between the adjacent first plane and second plane, and the first wavelength division multiplexing film is plated on the first plane. The included angle between any first plane and the light incoming and outgoing direction of the collimator is 45 degrees. The included angle between the light-in and light-out direction of the demultiplexing array piece and the light-in and light-out direction of the collimator is 90 degrees, the light-in and light-out direction of the demultiplexing array piece and the light-in and light-out direction of the collimator are located on the same plane, and the included angle between the first plane and the light-in and light-out direction of the demultiplexing array piece is 45 degrees. According to the utility model, the installation space can be greatly saved, and the difficulty of adjusting the distance of emergent light is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of wavelength division multiplexer technology, and specifically relates to a small wavelength division multiplexer. Background Technology

[0002] In a traditional wavelength division multiplexer (WDM), the optical signal typically enters through an incident fiber collimator. λ11 passes through a prism reflector and is transmitted through the first dielectric filter. λ12, λ13, and λ14 are reflected by the dielectric filter and prism reflector, with λ12 being transmitted through the second dielectric filter. λ13 and λ14 are then reflected by the second dielectric filter and prism reflector, with λ13 being transmitted through the third dielectric filter. Finally, λ14 is reflected by the third dielectric filter and prism reflector and is transmitted through the fourth dielectric filter, thus achieving wavelength division multiplexing. However, traditional WDMs deposit the dielectric film of the filters onto four separate glass plates, requiring these four filters to be arranged sequentially. The transmission distance must be traveled along the thickness of the filters, increasing the overall size of the product.

[0003] Chinese patent document CN214151132U discloses a wave-splitting and wave-combining optical component, comprising a first prism 1 and at least one second prism 2, wherein the first prism 1 and the second prism 2 are arranged in a fitted configuration; a filter film 3 is coated above both the first prism 1 and the second prism 2; a transmission area 11 is located below the first prism 1, and a high-reflectivity film 4 is coated below the second prism 2; three second prisms are provided, and the transmission area 11 is coated with a high-transmittance film 5. The prism 1 and the three second prisms 2 are connected and merged into a whole by adhesive to achieve the wave-splitting and wave-combining function. However, the technical solution disclosed in the above patent still has at least the following problems: In this wave-splitting and wave-combining optical component, light also needs to be transmitted along the length of multiple prisms and needs to be transmitted over a certain distance, resulting in a large installation space for multiple prisms; the incident light and the outgoing light are in the same direction, and installation space needs to be reserved in this direction when setting up the collimator and the outgoing light focuser. As can be seen from the above, the technical solution disclosed in this patent requires increasing or decreasing the length of the prism when adjusting the distance between the emitted light beams, and also requires reserving space in the length direction to install a collimator and an emitted light focuser. Therefore, it occupies a large amount of space in the direction of incident light and emitted light, and it is difficult to reduce the distance between the emitted light beams. Utility Model Content

[0004] In order to solve the above-mentioned problems in the existing technology, the purpose of this utility model is to provide a small wavelength division multiplexer, which can effectively avoid the problem of large longitudinal size caused by the incident light and the output light direction being in the same direction, greatly save installation space, and reduce the difficulty of adjusting the output light spacing.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A small wavelength division multiplexer includes:

[0007] case;

[0008] A light filtering assembly includes a plurality of light filters arranged in parallel within the housing. Each light filter has a first plane and a second plane that are parallel to each other. The first plane of any light filter coincides with the second plane of its adjacent light filter. A first wavelength division multiplexing film for reflecting light signals of a preset wavelength and transmitting light signals of other wavelengths is disposed between the adjacent first plane and the second plane. The first wavelength division multiplexing film is deposited on the first plane.

[0009] A collimator is disposed on the housing, wherein any of the first planes forms an angle of 45° with the input and output light directions of the collimator;

[0010] A demultiplexing array is disposed on the housing. The angle between the input and output light direction of the demultiplexing array and the input and output light direction of the collimator (pointing to the incident and output ports of the collimator) is 90°. The input and output light of the demultiplexing array (pointing to the incident and output ports of the demultiplexing array) and the input and output light of the collimator are located on the same plane. Any first plane has an angle of 45° with the input and output light direction of the demultiplexing array.

[0011] In some possible embodiments, the demultiplexing array includes multiple demultiplexing optical couplers for transmitting optical signals of a preset wavelength and isolating optical signals of other wavelengths. The multiple demultiplexing optical couplers are arranged side by side on the housing, and the optical signals of the preset wavelength transmitted by the multiple demultiplexing optical couplers correspond one-to-one with the optical signals of the preset wavelength reflected by the multiple first wavelength division multiplexing films.

[0012] In some possible embodiments, any of the demultiplexed optical couplers includes a mirror body and a second wavelength division multiplexing film for transmitting optical signals of a preset wavelength and isolating optical signals of other wavelengths. The mirror body has a first mirror surface and a second mirror surface that are parallel to each other. The first mirror surface is located on the side closer to the filter, and the second wavelength division multiplexing film is deposited on the first mirror surface.

[0013] In some possible embodiments, the second mirror is coated with an antireflective film.

[0014] In some possible embodiments, the housing is provided with a spacing adjustment mechanism for adjusting the spacing between adjacent demultiplexed optical couplers.

[0015] In some possible embodiments, the spacing adjustment mechanism includes a guide rod and a plurality of sliders sequentially sleeved on the guide rod. The guide rod is disposed on the housing, and any one of the sliders can slide along the guide rod. The plurality of demultiplexed optical couplers are correspondingly disposed on the plurality of sliders.

[0016] The beneficial effects of this utility model are as follows:

[0017] This invention provides a miniature wavelength division multiplexer (WDM). In this miniature WDM, the filter component changes the angle between the collimator's input and output light directions and the demultiplexing array's input and output light directions. The collimator and demultiplexing array are not set in the same direction, which effectively avoids the problem of large longitudinal dimensions caused by the incident and output light directions being in the same direction, greatly saving installation space. At the same time, the thickness extension direction of the filter is located in the angle region between the collimator and the demultiplexing array. Thus, when adjusting the thickness of the filter, space is actually rationally utilized, avoiding the space extension caused by adjusting the thickness in the same direction as the incident and output light directions, and also reducing the difficulty of reducing the output light spacing. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of this utility model;

[0020] Figure 3 This is a path diagram of the optical signal in this utility model;

[0021] Figure 4 This is a schematic diagram of the installation structure of the second wave division multiplexing membrane in this utility model;

[0022] Figure 5 This is a schematic diagram of the installation structure of the first wave division multiplexing membrane in this utility model.

[0023] In the figure: 1-Housing; 2-Filter; 201-First filter; 202-Second filter; 203-Third filter; 204-Fourth filter; 3-First plane; 4-Second plane; 5-First wavelength division multiplexing film; 6-Collimator; 7-Demultiplexing array; 701-First demultiplexing optical coupler; 702-Second demultiplexing optical coupler; 703-Third demultiplexing optical coupler; 704-Fourth demultiplexing optical coupler; 8-Mirror body; 9-Second wavelength division multiplexing film; 10-First mirror surface; 11-Second mirror surface; 12-Antireflective coating; 13-Guide rod; 14-Slider. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Example

[0026] The following is for reference Figures 1 to 5 The present invention will be described in further detail below.

[0027] like Figures 1-5 This embodiment provides a small wavelength division multiplexer (WDM), including a housing 1, a filter assembly, a collimator 6, and a demultiplexing array 7. The filter assembly includes multiple filters 2 arranged side-by-side within the housing 1. Each filter 2 has a first plane 3 and a second plane 4 that are parallel to each other. The first plane 3 of any filter 2 coincides with the second plane 4 of its adjacent filter 2. A first WDM film 5, used to reflect optical signals of a preset wavelength and transmit optical signals of other wavelengths, is disposed between adjacent first planes 3 and second planes 4. The first WDM film 5 is deposited on the first plane 3. Specifically, the first WDM film 5 is used to sequentially reflect optical signals with preset wavelengths λ1, λ2, λ3, λ4… and to transmit optical signals of other wavelengths. The collimator 6 is disposed on the housing 1, and the angle between any of the first planes 3 and the input / output light directions of the collimator 6 is 45°. The aforementioned demultiplexing array 7 is disposed on the aforementioned housing 1. The angle between the input and output light direction of the demultiplexing array 7 and the input and output light direction of the collimator 6 is 90°, and the input and output light of the demultiplexing array 7 and the input and output light of the collimator 6 are located on the same plane. The angle between any first plane 3 and the input and output light direction of the demultiplexing array 7 is 45°.

[0028] Please refer to Figures 1-3Specifically, in this embodiment, the preferred filtering assembly includes four filters 2, namely: a first filter 201, a second filter 202, a third filter 203, and a fourth filter 204. The first filter 201 is located near the collimator 6, meaning the light signal output from the collimator 6 sequentially reaches the first filter 201, the second filter 202, the third filter 203, and the fourth filter 204. In this process, the light signal first enters from the collimator 6 and is incident on the first filter 201. When the light signal is transmitted to the first wavelength division multiplexing film 5 on the first plane 3 of the first filter 201, it reflects the light signal with a preset wavelength of λ1 and transmits the light signals with wavelengths of λ2, λ3, and λ4. The light signal with wavelength λ1 is reflected and then transmitted to the corresponding demand module via the demultiplexing array 7. The transmitted light signals with wavelengths of λ2, λ3, and λ4 pass through the second filter 202. When the light signal is transmitted to the first wavelength division multiplexing film 5 on the first plane 3 of the second filter 202, it reflects the light signal with a preset wavelength of λ2 and transmits the light signals with wavelengths of λ3 and λ4. The light signal with wavelength λ2 is reflected and then transmitted to the corresponding demand module via the demultiplexing array 7. After transmission, the light signals with wavelengths λ3 and λ4 pass through the third filter 203. When they are transmitted to the first wavelength division multiplexing film 5 on the first plane 3 of the third filter 203, the light signal with a preset wavelength of λ3 is reflected, and the light signal with a wavelength of λ4 is transmitted. The light signal with wavelength λ3 is reflected and then transmitted to the corresponding demand module through the demultiplexing array 7. Finally, the light signal with wavelength λ4 after transmission passes through the fourth filter 204. When it is transmitted to the first wavelength division multiplexing film 5 on the first plane 3 of the fourth filter 204, the light signal with a preset wavelength of λ4 is reflected. The light signal with wavelength λ4 is reflected and then transmitted to the corresponding demand module through the demultiplexing array 7. Since the angle between the light input / output direction of the demultiplexing array 7 and the light input / output direction of the collimator 6 is 90°, the angle between the original optical signal (i.e., the optical signal output by the collimator 6) and the optical signal input to the demultiplexing array 7 in the above process is 90°. Thus, the collimator 6 and the demultiplexing array 7 are not set in the same direction, which can effectively avoid the problem of large longitudinal dimensions caused by the incident light and the output light being in the same direction, and greatly save installation space.

[0029] Please refer to Figures 1-3In the above process, when optical signals with wavelengths λ2, λ3, and λ4 pass through the demultiplexing array 7, the adjacent spacing between them can be adjusted by adjusting the thickness of the corresponding first filter 201, second filter 202, third filter 203, and fourth filter 204. Since the angle between any first plane 3 and the light direction of collimator 6 is 45°, and the angle between any first plane 3 and the light direction of demultiplexing array 7 is also 45°, the thickness extension direction of filter 2 is actually located in the angle region between collimator 6 and demultiplexing array 7. Thus, when adjusting the thickness of filter 2, space is actually used reasonably, avoiding the space extension caused by adjusting the thickness in the same direction as the incident and outgoing light, and reducing the difficulty of reducing the spacing between outgoing light.

[0030] Please refer to Figures 1-3 In some embodiments of this example, the demultiplexing array 7 includes multiple demultiplexing optical couplers for transmitting optical signals of a preset wavelength and isolating optical signals of other wavelengths. These multiple demultiplexing optical couplers are arranged side-by-side on the housing 1. The preset wavelength optical signals transmitted by the multiple demultiplexing optical couplers correspond one-to-one with the preset wavelength optical signals reflected by the multiple first wavelength division multiplexing films 5. The demultiplexing optical couplers are actually used to receive the optical signals reflected by their corresponding filters 2 and transmit the optical signals to the corresponding required modules.

[0031] Please refer to Figure 4 Specifically, the arbitrary demultiplexing optical coupler in this embodiment includes a mirror body 8 and a second wavelength division multiplexing (WDM) film 9 for transmitting optical signals of a preset wavelength and isolating optical signals of other wavelengths. The mirror body 8 has a first mirror surface 10 and a second mirror surface 11 that are parallel to each other. The first mirror surface 10 is located on the side closer to the filter 2, and the second WDM film 9 is deposited on the first mirror surface 10. The mirror body 8, as a carrier of the second WDM film 9, also transmits light. The second WDM film 9 is used to transmit optical signals of a preset wavelength and further isolate impurity optical signals, making the corresponding optical signal more accurate.

[0032] Please refer to Figures 1-3Specifically, the four filters 2 are divided into four types: a first filter 201, a second filter 202, a third filter 203, and a fourth filter 204. To match the corresponding filters 2, this embodiment includes four demultiplexing optical couplers: a first demultiplexing optical coupler 701, a second demultiplexing optical coupler 702, a third demultiplexing optical coupler 703, and a fourth demultiplexing optical coupler 704. After the optical signal with wavelength λ1 is reflected, it passes through the second wavelength division multiplexing film 9 on the first demultiplexing optical coupler 701. The second wavelength division multiplexing film 9 transmits the optical signal with a preset wavelength of λ1 and isolates optical signals of other wavelengths. Similarly, the optical signals with wavelengths λ2, λ3, and λ4 also enter the second demultiplexing optical coupler 702, the third demultiplexing optical coupler 703, and the fourth demultiplexing optical coupler 704 respectively for similar transmission and isolation of optical signals of other wavelengths.

[0033] Please refer to Figure 4 Furthermore, the second mirror 11 is coated with an anti-reflection film 12. The anti-reflection film 12 can reduce the reflection loss of the corresponding light signal on the second mirror 11, making the corresponding light signal more accurate.

[0034] In this embodiment, the angle at which the light reflected by the first wavelength division multiplexing film 5 is transmitted to the surface of the second wavelength division multiplexing film 9 is 0° to 6°. The purpose of selecting the above angle is to enable the outgoing light signal to be more accurately incident into the demultiplexing optical coupler, thereby facilitating the adjustment of the external dimensions and improving the coupling efficiency.

[0035] Please refer to Figures 1-3 It should be noted that in this embodiment, the housing 1 is a rectangular structure. The first filter 201, the second filter 202, the third filter 203, and the fourth filter 204 are sequentially overlapped at one corner of the rectangular structure. The lengths of the first filter 201, the second filter 202, the third filter 203, and the fourth filter 204 decrease sequentially, which also helps to save space and materials. As the last reflected light signal, the fourth filter 204 does not actually need the second plane 4. That is, in this embodiment, the cross-section of the fourth filter 204 is a right-angled triangle structure that fits one corner of the housing 1.

[0036] It should be further noted that the above embodiments only illustrate the beam splitting process. In the beam recombining process, the path direction of the optical signal is reversed. The beam recombining process will not be described in detail here. If there is anything unclear, it can be clarified by reverse reasoning.

[0037] Please refer to Figure 2In this embodiment, the housing 1 is provided with a spacing adjustment mechanism for adjusting the distance between adjacent demultiplexing optical couplers. This spacing adjustment mechanism is designed to accommodate changes in the spacing between the light signals reflected by the filter 2 after the thickness of the filter 2 is adjusted, ensuring that the corresponding light signals can enter the corresponding demultiplexing optical couplers.

[0038] Please refer to Figure 2 Specifically, in this embodiment, the aforementioned spacing adjustment mechanism includes a guide rod 13 and a plurality of sliders 14 sequentially sleeved on the guide rod 13. The guide rod 13 is disposed on the housing 1, and any of the sliders 14 can slide along the guide rod 13. The plurality of demultiplexed optical couplers are correspondingly disposed on the plurality of sliders 14. The sliders 14 can drive the corresponding demultiplexed optical couplers to move along the guide rod 13, thereby adjusting the spacing between adjacent demultiplexed optical couplers. More specifically, in this embodiment, a locking component (not shown in the figure) is also provided between the sliders 14 and the guide rod 13. This locking component includes locking bolts, etc. The locking component is used to lock the sliders 14 and the guide rod 13 after the aforementioned spacing adjustment is completed. The locking component is an existing structure and will not be further described here. If there is any unclear point, please refer to the prior art.

[0039] In this embodiment, the wavelength division multiplexing film on the first plane of the first filter transmits light at an angle of 45±0.5° to the film surface. The purpose of selecting this angle is to enable the emitted light signal to be more accurately incident into the demultiplexing optical coupler, thereby facilitating the adjustment of the external dimensions and improving the coupling efficiency.

[0040] In this embodiment, the angle at which the light transmitted through the first wavelength division multiplexing film 5 is transmitted to the surface of the next first wavelength division multiplexing film 5 is 28-29°. The purpose of selecting the above angle is to enable the outgoing light signal to be more accurately incident into the demultiplexing optical coupler, thereby facilitating the adjustment of the external dimensions and improving the coupling efficiency.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A compact wavelength division multiplexer, characterized by include: case; A light filtering assembly includes a plurality of light filters arranged in parallel within the housing. Each light filter has a first plane and a second plane that are parallel to each other. The first plane of any light filter coincides with the second plane of its adjacent light filter. A first wavelength division multiplexing film for reflecting light signals of a preset wavelength and transmitting light signals of other wavelengths is disposed between the adjacent first plane and the second plane. The first wavelength division multiplexing film is deposited on the first plane. A collimator is disposed on the housing, wherein any of the first planes forms an angle of 45° with the input and output light directions of the collimator; A demultiplexing array is disposed on the housing. The angle between the input and output light directions of the demultiplexing array and the input and output light directions of the collimator is 90°, and the input and output light of the demultiplexing array and the input and output light of the collimator are located on the same plane. Any first plane has an angle of 45° with the input and output light directions of the demultiplexing array.

2. The compact wavelength division multiplexer of claim 1, wherein The demultiplexing array includes multiple demultiplexing optical couplers for transmitting optical signals of a preset wavelength and isolating optical signals of other wavelengths. The multiple demultiplexing optical couplers are arranged side by side on the housing, and the optical signals of the preset wavelength transmitted by the multiple demultiplexing optical couplers correspond one-to-one with the optical signals of the preset wavelength reflected by the multiple first wavelength division multiplexing films.

3. The compact wavelength division multiplexer of claim 2, wherein Any of the demultiplexed optical couplers includes a mirror body and a second wavelength division multiplexing film for transmitting optical signals of a preset wavelength and isolating optical signals of other wavelengths. The mirror body has a first mirror surface and a second mirror surface that are parallel to each other. The first mirror surface is located on the side close to the filter, and the second wavelength division multiplexing film is deposited on the first mirror surface.

4. The compact wavelength division multiplexer of claim 3, wherein The second mirror surface is coated with an anti-reflective film.

5. The compact wavelength division multiplexer of claim 2, wherein The housing is provided with a spacing adjustment mechanism for adjusting the spacing between adjacent demultiplexing optical couplers.

6. The compact wavelength division multiplexer of claim 5, wherein The spacing adjustment mechanism includes a guide rod and a plurality of sliders sequentially sleeved on the guide rod. The guide rod is disposed on the housing. Any slider can slide along the guide rod. The plurality of demultiplexed optical couplers are disposed one-to-one on the plurality of sliders.

Images