Small optical module for communication

Abstract

The utility model provides a miniature optical module for communication, a wavelength division multiplexing module comprises a base plate, a micro-optical assembly structure, a micro-lens array and an optical fiber array are arranged on the base plate, the micro-lens array is arranged between the micro-optical assembly structure and the optical fiber array, the micro-lens array comprises a lens base body, and the lens base body is arranged on the base plate. 4 * n + 1 linearly arranged lens surfaces are arranged on a substrate surface, corresponding to the micro-optical component structure, of the lens substrate, and n is a positive integer; the optical fiber array comprises 4 * n + 1 optical fibers, n is a positive integer, and the optical fibers are in one-to-one correspondence with the lens surfaces on the lens substrate. The small optical module for communication has the advantages that the overall size is reduced, the optical path is shortened, Gaussian beams are small in change and easy to couple in the transmission process, the coupling process is simplified, and the working efficiency is greatly improved; and moreover, the requirement of miniaturization development is met, and more channel modules under the same volume mean that a higher communication rate can be realized, the cost is reduced, and the productivity is improved.

Description

Technical Field

[0001] The utility model discloses an optical component, in particular a small optical module for communication, which can be applied to technical fields such as 5G optical communication, optical passive components, and optical communication components. Background Art

[0002] like Figure 1 and Figure 2 As shown, the existing conventional 4-channel optical module technical solution includes 5 collimators 10, Z-Block (micro-optical component structure) 20, corner prism 30, base plate 40 and packaging box 50, the 5 collimators are COM, CH1, CH2, CH3 and CH4, the optical fiber pigtail 101, glass tube 102, lens C lens 103 form a beam collimation component, the diameter of the component is 1.3mm; Z-Block 20 includes a glass substrate 201 and diaphragms 202~205, and the channel spacing is 1.5mm.

[0003] The conventional 4-channel optical module manufacturing method is as follows: 1) According to the requirements of different light spots, make collimators COM, CH1~CH4; 2) Fix Z-Block 20 and base plate 40 with glue; 3) Adjust the auxiliary collimator and CH4 collimator at the same time, the light is emitted from the auxiliary collimator, passes through Z-Block 20, and is received from the CH4 collimator. After the adjustment is completed, use glue to fix the CH4 collimator; 4) Use the corner prism 30 and COM collimator at the same time, the light is emitted from the COM collimator, passes through the corner prism 30, and is reversed and enters Z-Block 20, and is received from the CH4 collimator. After the adjustment is completed, use glue to fix the corner prism 30 and COM collimator; 5) Finally, couple CH1~CH3 one by one and fix them with glue.

[0004] However, this technical solution of conventional 4-channel optical module has three disadvantages: 1) The diameter of the conventional collimator is 1.3mm, and the coupling requires a spacing of 0.2mm, so the channel spacing of the product is 1.5mm. And the larger the channel spacing of the Z-Block, the larger the length and width of the Z-Block. Therefore, the overall size of the product is large, which does not meet the development needs of miniaturization of optical module products; 2) Due to the large size of the above products, the optical path is long, and the light coming out of the collimator is a Gaussian beam with a divergence angle, not an absolutely parallel light. The longer the optical path, the more obvious the change, so the collimator also needs to match different light spots; 3) The coupling process is cumbersome, requiring the use of auxiliary collimators and coupling and curing collimators one by one. Utility Model Content

[0005] In view of the above problems, the utility model provides a small optical module for communication, which is used for external (de)multiplexing of optical modules and is an important component in optical fiber communication. The product size is reduced, the optical path is shortened, the Gaussian beam changes little during transmission, is easy to couple, and the coupling process is simplified, which greatly improves work efficiency.

[0006] The technical solution adopted by the utility model is:

[0007] A small optical module for communication includes a wavelength division multiplexing module, the wavelength division multiplexing module includes a base plate, a micro-optical component structure, a micro-lens array and an optical fiber array are arranged on the base plate, the micro-lens array is located between the micro-optical component structure and the optical fiber array, the micro-lens array includes a lens substrate, and 4*n+1 lens surfaces arranged in a straight line are arranged on the substrate surface of the lens substrate corresponding to the micro-optical component structure, where n is a positive integer; the optical fiber array includes 4*n+1 optical fibers, where n is a positive integer, and each optical fiber corresponds to each lens surface on the lens substrate one by one.

[0008] Preferably, the micro-optical component structure includes a substrate, and the front side of the substrate is provided with an AR diaphragm and 4*n filters arranged in a straight line and side by side, n is a positive integer, and the substrate, the AR diaphragm and the 4*n filters are glued and fixed; the rear side of the substrate is coated with a high-reflection film; the light incident side of the AR diaphragm has an inclined light incident side, and the light incident side of the AR diaphragm is coated with an anti-reflection film; the filters are grouped into four pieces, and the overall filter includes more than one group, each group of filters includes a first filter, a second filter, a third filter and a fourth filter, respectively, the front side of each filter is coated with an anti-reflection film, and the rear side of each filter is coated with a WDM film.

[0009] More preferably, the spacing between the optical channels in the micro-optical component structure is 0.5 mm to 1.5 mm.

[0010] Preferably, the micro-optical component structure includes an AR diaphragm and 4*n filters arranged side by side in a straight line, n is a positive integer, the AR diaphragm and each filter are glued and fixed to each other, the AR diaphragm has an inclined light incident side, the light incident side of the AR diaphragm is coated with an anti-reflection film, and the back of the AR diaphragm is coated with a high-reflection film; the filters are grouped into four pieces, the overall filter includes more than one group, each group of filters includes a first filter, a second filter, a third filter and a fourth filter, the front side of each filter is coated with a WDM film, and the back side of each filter is coated with a high-reflection film.

[0011] More preferably, the AR film and each filter are in strip shape.

[0012] More preferably, the spacing between the optical channels in the micro-optical component structure is 0.25 mm to 0.5 mm.

[0013] Preferably, the rear side surface of the lens substrate is opposite to the micro-optical component structure, the lens surface is on the rear side surface of the lens substrate, and the front side surface and the rear side surface of the lens substrate are coated with an anti-reflection film; the side surface of each optical fiber adjacent to the microlens array is coated with an anti-reflection film; the anti-reflection film satisfies: R<0.2%@1260~1650nm; the high-reflection film satisfies: R≥99.8%@1260~1650nm.

[0014] Preferably, the optical fiber array further comprises an optical fiber mounting seat, which comprises a base and a cover plate cooperating with the base, wherein a plurality of V-shaped grooves are arranged in the base, and each optical fiber is placed in a corresponding V-shaped groove.

[0015] More preferably, the base plate is a ceramic or glass base plate.

[0016] Preferably, the wavelength division multiplexing module is packaged in a packaging box.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model provides a small optical module for communication, the microlens array is between the micro-optical component structure and the optical fiber array, the emission and reception of light are on the same side, and the optical fiber array + microlens array are used to form an optical transmission channel, replacing the existing collimator transmission structure, reducing the size of the entire optical module, reducing the overall size, shortening the optical path, and the Gaussian light beam changes little during the transmission process, which is easy to couple, simplifying the coupling process, and greatly improving work efficiency; and it meets the needs of miniaturization development, accommodating more channel modules in the same volume means that a higher communication rate can be achieved, reducing costs and improving productivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 , schematic diagram of existing conventional 4-channel optical module Figure 1 ;

[0019] Figure 2 , schematic diagram of existing conventional 4-channel optical module Figure 2 ;

[0020] Figure 3 , the production coupling diagram of the existing conventional 4-channel optical module;

[0021] Figure 4 , which is a schematic diagram of a first embodiment of a small optical module for communication provided by the utility model;

[0022] Figure 5 , is an internal schematic diagram of a first embodiment of a small optical module for communication provided by the utility model;

[0023] Figure 6 , is a schematic diagram of a microlens array in a first embodiment of a small optical module for communication provided by the utility model;

[0024] Figure 7 , is a schematic diagram of an optical fiber array in a first embodiment of a small optical module for communication provided by the utility model;

[0025] Figure 8 , is a schematic diagram of a substrate in a first embodiment of a small optical module for communication provided by the utility model;

[0026] Fig. 9 , is a schematic diagram of an AR film in a first embodiment of a small optical module for communication provided by the utility model;

[0027] Fig.10 , is a schematic diagram of a filter in a first embodiment of a small optical module for communication provided by the utility model;

[0028] Fig.11 , which is a light path schematic diagram of a first implementation mode of a small optical module for communication provided by the utility model;

[0029] Fig.12 , is a schematic diagram of a second embodiment of a small optical module for communication provided by the utility model;

[0030] Fig.13 , is a schematic diagram of an AR diaphragm in a second embodiment of a small optical module for communication provided by the utility model;

[0031] Fig.14 , is a schematic diagram of a filter in a second embodiment of a small optical module for communication provided by the utility model;

[0032] Fig.15 , which is a light path schematic diagram of a second embodiment of a small optical module for communication provided by the utility model. DETAILED DESCRIPTION

[0033] The preferred implementation modes provided by the utility model are described in detail according to the accompanying drawings.

[0034] Figures 4 to 11 , which is the first preferred embodiment of a small optical module for communication provided by the utility model. Figures 4 to 11As shown, the small optical module for communication includes a wavelength division multiplexing module 10, and the wavelength division multiplexing module 10 includes a base plate 11, on which a micro-optical component structure (Z-Block) 12, a micro-lens array (MLA) 13 and an optical fiber array (FA) 14 are provided, and the micro-lens array (MLA) 13 is located between the micro-optical component structure 12 and the optical fiber array (FA) 14, and the micro-lens array (MLA) 13 includes a lens substrate 131, and a substrate surface of the lens substrate 131 corresponding to the micro-optical component structure 12 is provided with 4*n+1 lens surfaces 132 arranged in a straight line, where n is a positive integer; the optical fiber array 14 includes 4*n+1 optical fibers 142, where n is a positive integer, and each optical fiber 142 corresponds to each lens surface 132 on the lens substrate 131 one by one, and each optical fiber in the optical fiber mounting seat 141 is arranged on the lens substrate 131. The side of the fiber adjacent to the microlens array is coated with an anti-reflection film 100. The optical signal emitted from the incident optical fiber in the optical fiber array 14 enters the lens matrix 131, passes through the corresponding lens surface 132, enters the micro-optical component structure 12, and after wavelength division multiplexing by the micro-optical component structure 12, passes through the corresponding lens surface 132 and the lens matrix 131, and enters the output optical fiber in the optical fiber array 14. In this way, the optical module uses the optical fiber array (FA) + microlens array (MLA) to form an optical transmission channel, replacing the existing collimator transmission structure. The microlens array 13 is between the micro-optical component structure 12 and the optical fiber array 14, which reduces the size of the entire optical module and the overall size, meeting the needs of miniaturization development. The same volume can accommodate more channel modules, which means that a higher communication rate can be achieved, reducing costs and improving productivity. The base plate 11 is a ceramic or glass base plate.

[0035] like Figure 6As shown, the lens substrate 131 and the lens surface 132 in the microlens array (MLA) 13 are integrally formed, and the lens surface 132 is processed on the lens substrate 131. Each lens surface 132 in the microlens array (MLA) 13 corresponds to each optical fiber 142, and the theoretical minimum diameter of the lens surface 132 can reach 0.005mm, so it can be used with the optical fiber array (FA) 14 with any channel spacing. As a preferred embodiment, the channel spacing of the microlens array (MLA) 13 used in the micro-optical component structure (Z-Block) 12 in this application is 0.25 / 0.5mm. The manufacturing materials of the microlens array (MLA) 13 are diverse, including Silicon (silicon lens) with a large refractive index, N-SF11 with the same material as the conventional collimator C lens, etc.; the curved surface of the microlens array (MLA) 13 is variable and can adapt to the use requirements, such as a normal spherical lens, or an aspherical lens, or a cylindrical lens with different curvatures in the XY direction. As a preferred embodiment, the lens substrate 131 and the lens surface 132 in the present application are cylindrical lenses, which optimize the uneven size of the light spot in the XY direction caused by the large-angle refraction of the light-incident end membrane, thereby improving the product coupling efficiency.

[0036] There are many methods for processing the microlens array (MLA) 13, including mechanical processing, thermal reflow, glue spraying, grayscale exposure, micro-nano 3D printing, etc., which can process a small lens surface with a lens center spacing of 250um.

[0037] The rear side surface of the lens substrate 131 is opposite to the micro-optical component structure (Z-Block) 12, and the lens surface 132 is located on the rear side surface of the lens substrate 131. The front side surface and the rear side surface of the lens substrate 131 are coated with an anti-reflection (AR) film 100, and the anti-reflection film satisfies R<0.2%@1260~1650nm. The remaining surfaces of the lens substrate 131 are polished.

[0038] like Figure 7 As shown, one side of each optical fiber adjacent to the microlens array is coated with an anti-reflection film; the anti-reflection film satisfies R < 0.2% @@ 1260nm ~ 1650nm. The minimum channel spacing of each optical fiber in the optical fiber array (FA) 14 can reach 0.127mm. Taking SMF-28Ultra as an example, the diameter of the optical fiber cladding is 0.125mm, that is, the optical fiber fits tightly, and some optical fiber claddings are smaller, and the spacing can also be smaller. As a preferred embodiment, the present application uses a FA with a channel spacing of 0.25 / 0.5mm used in conjunction with the micro-optical component structure (Z-Block) 12. The size of the optical fiber array (FA) 14 is very small, with a minimum length of 2.8mm and a thickness of 0.7mm.

[0039] The number of optical fibers in the optical fiber array (FA) 14 can be any number in theory, that is, the number of channels of FA can be any number in theory, such as 1, 2, 3... The optical fibers in the optical fiber array (FA) 14 can use any type of optical fiber, such as single-mode optical fiber, few-mode optical fiber, multi-mode optical fiber, etc. The optical fiber spacing of the FA can be ≥127um.

[0040] The fiber array (FA) may not have a metal connector, such as in the form of bare fibers. As a preferred embodiment, the fiber array (FA) includes a fiber mounting seat 141, which includes a base 1411 and a cover plate 1412 that cooperates with the base. The base is provided with a plurality of V-shaped grooves, and each optical fiber is placed in a corresponding V-shaped groove. In order to reduce the volume, the base 1411 and the cover plate 1412 are installed upside down, and the base 1411 is above the cover plate 1412.

[0041] like Figures 8 to 10 The micro-optical component structure 12 includes a substrate 123, the front side of the substrate is provided with an AR film 121 and 4*n filters 122 arranged in a straight line, n is a positive integer, and the substrate 123, the AR film 121 and the 4*n filters 122 are glued and fixed; the rear side of the substrate 123 is coated with a high reflection film 200; the AR film 121 has an inclined light incident side, and the light incident side of the AR film 121 is coated with an anti-reflection film 100; the filters are grouped into four pieces, and the overall filter includes more than one group, each group of filters includes a first filter 12201, a second filter 12202, a third filter 12203 and a fourth filter 12204, the front side of each filter is coated with an anti-reflection film 100, and the rear side of each filter is coated with a WDM film 300.

[0042] The substrate 123 is in the shape of a parallelogram. The substrate 123 is generally a glass substrate. The AR film 121 and each filter 122 are mounted on the front side of the substrate 123. The rear side of the substrate 123 is coated with a high reflection film 200. The remaining surfaces of the substrate 123 are polished. The high reflection film 200 satisfies R≥99.8%@1260~1650nm. The substrate 123, the AR film 121 and each filter 122 are glued and fixed.

[0043] The AR diaphragm 121 is in the form of a sheet, and the light incident side of the AR diaphragm 121 is formed by grinding at a large angle, which can refract the incident light into the micro-optical component structure 12 for transmission, and can allow the COM end channel to maintain the same channel spacing and direction as other channels; and can facilitate structural design and reduce the overall size. The light incident side of the AR diaphragm is coated with an anti-reflection film 100, and the anti-reflection film 100 meets R < 0.2% @ 1260 ~ 1650nm, and the other sides of the AR diaphragm are polished. The manufacturing material of the AR diaphragm can be selected from WMS-15 or silicon material. For example, the angle α between the light incident side and the back side of the AR diaphragm made of WMS-15 is 41.1°, while the angle α between the light incident side and the back side of the AR diaphragm made of silicon material is 10.51°.

[0044] Each filter 122 is in the form of a sheet. The front side of each filter is coated with an anti-reflection film 100 that satisfies R<0.2%@1260~1650nm. The rear side of each filter is coated with a WDM film 300, and the remaining surfaces are polished.

[0045] In this embodiment, the micro-optical component structure (Z-Block) uses a thin film filter as a key component of an optical transmission or receiving module, and the spacing between optical channels is 0.5mm~1.5mm, for example, the channel spacing is generally 0.75mm or 0.5mm, or a larger channel spacing, such as the Z-Block channel spacing of a conventional optical module is 1.5mm. This structural assembly method is suitable for micro-optical component structure (Z-Block) products with a channel spacing ≥ 0.5mm.

[0046] Taking the front side of the substrate 123 provided with an AR film 121 and four filters 122, as well as a 5-channel optical fiber array (FA) 14 as an example, when installing, first use a fixture to glue the microlens array (MLA) 13, the micro-optical component structure (Z-Block) 12 and the base plate 11 together, and then use an adjustment frame to fix the glued assembly of the microlens array (MLA) 13, the micro-optical component structure (Z-Block) 12 and the base plate 11, and use a six-dimensional adjustment frame to clamp the 5-channel optical fiber array (FA) 14, adjust the 5-channel optical fiber array (FA) 14, and couple the product loss to the minimum, and finally glue the fixed assembly to the 5-channel optical fiber array (FA) 14.

[0047] like Fig.11As shown, the propagation path of light is: 1) light is emitted from the COM end of the 5-channel fiber array (FA) 14, enters the microlens array (MLA) 13, and then enters 302 into the AR film 121; 2) light enters the substrate 123 from the AR film 121, and is reflected and transmitted therein; 3) when transmitted to the corresponding channel, it is transmitted from the WDM surface of the channel, and is emitted again into the microlens array (MLA) 13, and finally enters the corresponding port of the 5-channel fiber array (FA) 14.

[0048] like Figure 4 As shown, the small optical module for communication further includes a packaging box 20, and the wavelength division multiplexing module 10 is packaged in the packaging box 20. The packaging box 20 is a metal packaging box.

[0049] Figures 12 to 15 , which is the second preferred implementation of a small optical module for communication provided by the utility model. The difference between the second preferred embodiment of the small optical module for communication and the first embodiment of the small optical module for communication lies in the micro-optical component structure 12A. The micro-optical component structure 12A includes an AR film 121A and 4*n filters 122A arranged in a straight line and side by side, where n is a positive integer. The AR film 121A and each filter 122A are glued and fixed to each other. The AR film 121A has an inclined light incident side surface. The light incident side surface of the AR film 121A is coated with an anti-reflection film 100, and the back of the AR film is coated with a high-reflection film 200. The filters are grouped into four pieces, and the overall filter includes more than one group. Each group of filters includes a first filter 12201A, a second filter 12202A, a third filter 12203A and a fourth filter 12204A, respectively. The front side surface of each filter is coated with a WDM film 300, and the rear side surface of each filter is coated with a high-reflection film 200. The anti-reflection film 100 satisfies R<0.2%@1260~1650nm; the high-reflection film 200 satisfies R≥99.8%@1260~1650nm.

[0050] The AR diaphragm 121A and each filter 122A are in strip shape. The light incident side of the AR diaphragm 121A is formed by grinding at a large angle, which can refract the incident light into the micro-optical component structure 12A for transmission, and can allow the COM end channel to maintain the same channel spacing and direction as other channels; and can facilitate structural design and reduce the overall size. The light incident side of the AR diaphragm 121A is coated with an anti-reflection film 100, and the back of the AR diaphragm 121A is coated with a high-reflection film 200. When the AR diaphragm made of WMS-15 is used, the angle α between the light incident side and the back of the AR diaphragm is 41.1°.

[0051] In this embodiment, the micro-optical component structure (Z-Block) 12A is assembled using a single diaphragm strip, the spacing between optical channels is 0.25mm~0.5mm, and the channel spacing can reach 0.375mm or 0.25mm; it is suitable for Z-Block products with a channel spacing ≤0.5mm, with simple assembly, small channel spacing, and no obvious deformation.

[0052] Taking the micro-optical component structure (Z-Block) 12A having one AR film 121A and four filters 122A, and a 5-channel optical fiber array (FA) 14 as an example, when installing, first use a fixture to glue the microlens array (MLA) 13, the micro-optical component structure (Z-Block) 12A and the base plate 11 together, and then use an adjustment frame to fix the glued assembly of the microlens array (MLA) 13, the micro-optical component structure (Z-Block) 12A and the base plate 11, and use a six-dimensional adjustment frame to clamp the 5-channel optical fiber array (FA) 14, adjust the 5-channel optical fiber array (FA) 14, and couple the product loss to the minimum, and finally glue the fixed assembly to the 5-channel optical fiber array (FA) 14.

[0053] like Fig.15 As shown, the light propagation path is: 1) light is emitted from the COM end of the 5-channel fiber array (FA) 14, enters the microlens array (MLA) 13, and then enters 302 into the AR diaphragm 121A; 2) light is reflected and transmitted from the AR diaphragm 121A at the other first filter 12201A, the second filter 12202A, the third filter 12203A, and the fourth filter 12204A; 3) when transmitted to the corresponding channel, it is transmitted from the WDM surface of the channel, and is emitted into the microlens array (MLA) 13 again, and finally enters the corresponding port of the 5-channel fiber array (FA) 14.

[0054] The small optical module for communication provided by the utility model uses a fiber array (FA) 14 + a microlens array (MLA) 13 to form an optical transmission channel, replacing the existing collimator transmission structure; the channel spacing is very small, and the current minimum can reach 0.25mm. However, under normal circumstances, the channel spacing of the existing optical module is 1.5mm, that is, 1.3mm collimator diameter + 0.2mm collimator spacing; in special cases, the minimum diameter of the collimator is 0.11mm, that is, 0.9mm collimator diameter + 0.2mm collimator spacing.

[0055] The small optical module for communication provided by the utility model has the same performance as conventional optical modules, but is relatively small in size. For example, conventional optical modules use a channel spacing 0.15mm Z-Block structure + collimator coupling, and their length is ≥20mm, width ≥10mm, and height ≥5mm. The small optical module for communication provided by the utility model uses a channel spacing 500um micro-optical component structure (Z-Block) + microlens array (MLA) + fiber array (FA) structure, and has a size of 12.5*5.4*3.4mm, which is smaller.

[0056] In summary, the technical solution of the utility model can fully and effectively achieve the above-mentioned utility model purpose, and the structure and functional principle of the utility model have been fully verified in the embodiments, and can achieve the expected effect and purpose. Without departing from the principle and essence of the utility model, various changes or modifications can be made to the embodiments of the utility model. Therefore, the utility model includes all replacement contents within the scope mentioned in the scope of the patent application, and any equivalent changes made within the scope of the patent application of the utility model are within the scope of the patent application of this case.

Claims

1. A small optical module for communication, comprising a wavelength division multiplexing module, characterized in that: The wavelength division multiplexing module includes a base plate, on which a micro-optical component structure, a micro-lens array and an optical fiber array are arranged, the micro-lens array is located between the micro-optical component structure and the optical fiber array, the micro-lens array includes a lens substrate, and a substrate surface of the lens substrate corresponding to the micro-optical component structure is provided with 4*n+1 lens surfaces arranged in a straight line, where n is a positive integer; the optical fiber array includes 4*n+1 optical fibers, where n is a positive integer, and each optical fiber corresponds one-to-one to each lens surface on the lens substrate.

2. The small optical module for communication according to claim 1, characterized in that: The micro-optical component structure includes a substrate, and the front side of the substrate is provided with an AR diaphragm and 4*n filters arranged in a straight line and side by side, n is a positive integer, and the substrate, the AR diaphragm and the 4*n filters are glued and fixed; the rear side of the substrate is coated with a high-reflection film; the AR diaphragm has an inclined light incident side, and the light incident side is coated with an anti-reflection film; the filters are grouped into four pieces, and the overall filter includes more than one group, and each group of filters includes a first filter, a second filter, a third filter and a fourth filter, respectively, the front side of each filter is coated with an anti-reflection film, and the rear side of each filter is coated with a WDM film.

3. The small optical module for communication according to claim 2, characterized in that: The spacing between the optical channels in the micro-optical component structure is 0.5 mm to 1.5 mm.

4. The small optical module for communication according to claim 1, characterized in that: The micro-optical component structure includes an AR diaphragm and 4*n filters arranged in a straight line, n is a positive integer, the AR diaphragm and each filter are glued and fixed to each other, the AR diaphragm has an inclined light incident side, the light incident side of the AR diaphragm is coated with an anti-reflection film, and the back of the AR diaphragm is coated with a high-reflection film; the filters are grouped into four pieces, the overall filter includes more than one group, each group of filters includes a first filter, a second filter, a third filter and a fourth filter, the front side of each filter is coated with a WDM film, and the back side of each filter is coated with a high-reflection film.

5. The small optical module for communication according to claim 4, characterized in that: The AR film and each filter are in strip shape.

6. The small optical module for communication according to claim 4, characterized in that: The spacing between the optical channels in the micro-optical component structure is 0.25 mm to 0.5 mm.

7. The small optical module for communication according to any one of claims 2 or 4, characterized in that: The rear side of the lens substrate is opposite to the micro-optical component structure, the lens surface is located on the rear side of the lens substrate, and the front side and the rear side of the lens substrate are coated with anti-reflection film; the side of each optical fiber adjacent to the microlens array is coated with an anti-reflection film; the anti-reflection film satisfies R<0.2%@1260~1650nm; the high-reflection film satisfies R≥99.8%@1260~1650nm.

8. The small optical module for communication according to claim 1, characterized in that: The optical fiber array also includes an optical fiber mounting seat, which includes a base and a cover plate matched with the base. A plurality of V-shaped grooves are arranged in the base, and each optical fiber is placed in a corresponding V-shaped groove.

9. The small optical module for communication according to claim 1, characterized in that: The bottom plate is a ceramic or glass bottom plate.

10. The small optical module for communication according to claim 1, characterized in that: The wavelength division multiplexing module is placed in a packaging box for packaging.

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