Optical module electromagnetic interference shielding structure and optical module

Abstract

The utility model relates to the related technical field of communication devices, and provides an electromagnetic interference shielding structure of an optical module and the optical module, which comprises a shell, a plurality of layers of isolation sheets and flexible shielding materials arranged on the isolation sheets, a sheet groove is formed in the shell and is used for fixedly arranging the isolation sheet; a through hole in contact with the outer wall of the photoelectric transceiver module is formed in the isolation piece, and the isolation piece is perpendicular to the photoelectric transceiver module and used for isolating the front end and the rear end of the photoelectric transceiver module. According to the utility model, multiple layers of isolation sheets with different structures are adopted, and flexible shielding materials are arranged, so that gap filling is realized, and the electromagnetic shielding effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of communication devices, and specifically, to an electromagnetic interference shielding structure and an optical module for an optical module. Background Art

[0002] The statements in this part only provide background technical information related to the utility model, and do not necessarily constitute prior art.

[0003] A communication module may include various components involved in the transmission and reception of optical signals, such as an optoelectronic transceiver module: a transmitter optical subassembly (TOSA) and a receiver optical subassembly (ROSA). During the operation of such devices, due to the frequent switching of internal high-frequency circuits, a strong electromagnetic field is generated, thereby causing electromagnetic interference (EMI), which affects the operation of other components inside and / or outside the communication module.

[0004] The transmitter optical subassembly TOSA usually includes a laser, a transmitting optical fiber, and a circuit for controlling the laser. The laser converts an electrical signal into an optical signal, and the transmitting optical fiber transmits the optical signal into a communication network. The receiver optical subassembly ROSA includes a photodetector, a receiving optical fiber, and a circuit for converting the optical signal into an electrical signal. The photodetector of the ROSA converts the incident optical signal into an electrical signal for use by downstream circuits. Since precise detection of optical signals is required, the ROSA is vulnerable to surrounding electromagnetic interference, resulting in signal degradation. The high-frequency circuit part is the main source of electromagnetic interference (EMI): in the TOSA, the high-frequency circuit is mainly the laser drive and modulation circuit; in the ROSA, the high-frequency circuit is mainly the photodetector, the transimpedance amplifier, and the subsequent signal amplification and equalization circuits. Therefore, to effectively solve the problem of reducing the electromagnetic interference emitted by or experienced by the optical components, it is necessary to effectively shield the high-frequency circuit part.

[0005] The inventors found in their research that the existing optical modules mainly shield electromagnetic interference (EMI) in the following ways: 1) Setting up a metal shielding cover: covering key components such as TOSA and ROSA with a metal shielding cover to block the radiation of the electromagnetic field. A single-layer metal shielding cover may not be able to completely cover all interference paths, and the shielding effect is poor; 2) Conductive tape and shielding materials: using conductive tape or conductive materials to encapsulate the circuit to reduce electromagnetic radiation. However, the installation of conductive tape and shielding materials is usually more complex, and it may also have a negative impact on the thermal management of the module. In addition, the shielding effect of such materials is not good in the high-frequency band and is easily damaged; 3) Using electromagnetic absorption materials, such as ferrite or wave-absorbing sheets, at key parts of the module to absorb excess electromagnetic energy. The absorption efficiency of electromagnetic absorption materials is limited by frequency and may be ineffective outside certain frequency ranges. In addition, it is difficult to arrange these materials in place in a limited space. It can be seen that the existing methods have the problem of poor shielding effect. Summary of the Invention

[0006] To solve the above problems, the present utility model provides an electromagnetic interference shielding structure for an optical module and an optical module. By using multi-layer isolation sheets with different structures and setting flexible shielding materials, the gaps are filled, improving the electromagnetic shielding effect.

[0007] To achieve the above object, the present utility model adopts the following technical solutions:

[0008] One or more embodiments provide an electromagnetic interference shielding structure for an optical module, including a housing, multi-layer isolation sheets, and flexible shielding materials provided on the isolation sheets; a sheet groove is provided inside the housing for fixedly arranging the isolation sheets; through holes are formed on the isolation sheets and are in contact with the outer wall of the optical transceiver module, and the isolation sheets are perpendicular to the optical transceiver module for isolating the front end and the rear end of the optical transceiver module.

[0009] One or more embodiments provide an optical module that adopts the above electromagnetic interference shielding structure for an optical module.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] The present utility model sets multi-layer isolation sheets, which can achieve multi-stage isolation. An isolation cavity is formed between every two isolation sheets, and it can effectively isolate the devices or circuits at both ends of the isolation cavity; and flexible shielding materials are provided on the isolation sheets, which can fill the gaps generated by the rigid contact of the isolation sheets, further reducing the electromagnetic wave leakage effect. The multi-stage isolation structure of this embodiment combined with the setting of flexible shielding materials can greatly improve the isolation effect and greatly reduce the influence of electromagnetic interference on the optical module rear-end circuit of the communication module.

[0012] The advantages of the present utility model and the advantages of additional aspects will be described in detail in the following specific embodiments. Description of the Drawings

[0013] The accompanying drawings forming a part of this specification are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute a limitation to the present utility model.

[0014] Figure 1 is the first exploded view of an electromagnetic interference shielding structure for an optical module according to Embodiment 1 of the present utility model;

[0015] Figure 2 is the second exploded view of an electromagnetic interference shielding structure for an optical module according to Embodiment 1 of the present utility model;

[0016] Figure 3It is the first structural schematic diagram of the base 1-2 in Embodiment 1 of the present utility model;

[0017] Figure 4 It is the top view structural schematic diagram of the base 1-2 in Embodiment 1 of the present utility model;

[0018] Figure 5 It is the top view structural schematic diagram of the base 1-2 in Embodiment 1 of the present utility model after the internal circuit module is arranged;

[0019] Figure 6 It is the structural schematic diagram of the spacer I 5 in Embodiment 1 of the present utility model;

[0020] Figure 7 It is the structural schematic diagram of the spacer II 7 and the spacer III 8 placed opposite to each other in Embodiment 1 of the present utility model;

[0021] Wherein: 1. Housing, 2. PCBA board, 3. TOSA, 4. ROSA, 5. Spacer I, 6. Flexible shielding material, 7. Spacer II, 8. Spacer III;

[0022] 1-1. Upper cover, 1-2. Base, 1-3. First sheet slot, 1-4. Second sheet slot;

[0023] 5-1. Sheet-like body, 5-2. Through hole, 5-3. Notch; 7-1. Accommodating groove. Detailed implementation manners

[0024] The present utility model will be further described below in conjunction with the drawings and embodiments.

[0025] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further descriptions of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0026] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. It should be noted that, without conflict, the various embodiments and features in the present utility model can be combined with each other. The embodiments will be described in detail below in conjunction with the drawings.

[0027] Embodiment 1

[0028] In the technical solutions disclosed in one or more embodiments, asFigures 1 to 7 As shown in the figure, an electromagnetic interference shielding structure for an optical module includes a housing 1, multiple isolation sheets, and a flexible shielding material 6 provided on the isolation sheets; a sheet groove is provided inside the housing 1 for fixedly arranging the isolation sheets; through holes are formed on the isolation sheets and are in contact with the outer wall of the optoelectronic transceiver module, and the isolation sheets are arranged perpendicular to the optoelectronic transceiver module for isolating the front end and the rear end of the optoelectronic transceiver module.

[0029] In this embodiment, multiple isolation sheets are provided to achieve multi-stage isolation. An isolation cavity is formed between every two isolation sheets, which can effectively isolate the devices or circuits at both ends of the isolation cavity; and a flexible shielding material 6 is provided on the isolation sheets, which can fill the gaps generated by the rigid contact of the isolation sheets, further reducing the electromagnetic wave leakage effect. The multi-stage isolation structure of this embodiment combined with the setting of the flexible shielding material 6 can greatly improve the isolation effect and greatly reduce the influence of electromagnetic interference on the optical module rear-end circuit of the communication module.

[0030] In a further technical solution, the front end of the optoelectronic transceiver module is a cylinder, and an isolation sheet I 5 can be provided. The structure diagram of the isolation sheet I 5 can be as Figure 6 shown, including a sheet-shaped body 5-1 and through holes 5-2 provided on the sheet-shaped body 5-1, and the inner wall of the through holes 5-2 forms a tight fit with the outer wall of the front end of the optoelectronic transceiver module;

[0031] Specifically, the optoelectronic transceiver module can be a TOSA 3 or / and a ROSA 4.

[0032] The isolation sheet I 5 in this embodiment adopts a structure with through holes 5-2 to achieve a tight fit, which can reduce the gaps generated when the isolation sheet I 5 is connected to the optoelectronic transceiver module, thereby improving the isolation effect.

[0033] Optionally, a notch 5-3 is further provided on the isolation sheet I 5, and a positioning rib is provided on the inner wall of the housing 1; the notch 5-3 is set in a convex-like shape, and the width of the opening is greater than the width of the bottom of the notch, which can improve the assembly efficiency of the matching of the positioning rib and the notch 5-3;

[0034] Among them, the setting of the positioning rib can play a role in stably fixing the isolation sheet I 5, and at the same time is provided between the two through holes 5-2. The positioning rib on the housing 1 can play a role in isolating the TOSA 3 and the ROSA 4.

[0035] In a further technical solution, a flexible shielding material 6 is further provided on the isolation sheet I 5. The structure of the flexible shielding material 6 is the same as that of the isolation sheet I 5, and the size is slightly larger than that of the isolation sheet I 5;

[0036] In this embodiment, a flexible shielding material 6 is arranged with a size slightly larger than that of the isolation sheet I 5, which can enable the isolation sheet I 5 and the flexible shielding material 6 to wrap and contact the TOSA 3 and the ROSA 4, so that the TOSA 3 and the ROSA 4 are in communication contact with the housing 1 to form an isolation cavity. Since the flexible shielding material 6 is a flexible material, it eliminates the gaps generated by rigid contact and further reduces the electromagnetic wave leakage. The isolation sheet I 5 and the flexible shielding material 6 form a shielding wall.

[0037] A technical solution that can be achieved is to provide a plurality of sheet grooves in the housing 1. The sheet grooves are used to arrange the isolation sheets, and the number of sheet grooves corresponds to the number of isolation sheets arranged. In this embodiment, two isolation sheets are taken as an example, including a first sheet groove 1-3 and a second sheet groove 1-4. The first sheet groove 1-3 is used to arrange the isolation sheet I 5 and the flexible shielding material 6 to form a second shielding wall. The second sheet groove 1-4 is used to arrange the isolation sheet to form a second shielding wall.

[0038] It can be achieved that the inner wall of the housing 1 in the area where the isolation sheet is arranged is set as a shielding material to form a magnetic isolation shielding space.

[0039] A further technical solution is that in this embodiment, a plurality of isolation sheets are arranged in the housing 1. To improve the flexibility of assembly, the structure of the isolation sheet can also adopt the structure as Figure 7 shown, including an isolation sheet II 7 and an isolation sheet III 8. The isolation sheet II 7 and the isolation sheet III 8 can be relatively inserted or fitted, and an accommodation space for the outer wall of the optical transceiver module is formed in the middle after relative insertion.

[0040] Specifically, the two isolation sheets, namely the isolation sheet II 7 and the isolation sheet III 8, are set as an E-shaped structure, and the E-shaped isolation sheets form two accommodation grooves 7-1 for accommodating the middle outer walls of the TOSA 3 and the ROSA 4.

[0041] In the above solution, a group of isolation structures are formed by two isolation sheets, and the structure in which the two isolation sheets can be inserted or fitted is provided, which can improve the flexibility of setting the isolation structure.

[0042] Specifically, the width of the second sheet groove 1-4 is adapted to the thickness of the isolation sheet II 7 and the isolation sheet III 8, and is used to accommodate the isolation sheet II 7 and the isolation sheet III 8. Thus, under the action of the second sheet groove 1-4, the two isolation sheets are closely attached together;

[0043] In the above shielding structure, the spacer I 5 and the flexible shielding material 6 are placed in the first slot 1-3, at the front ends of the TOSA 3 and ROSA 4, and can be configured to cover the chamber and be attached to the housing 1. The spacer I 5 and the shielding material can wrap and contact the TOSA 3 and ROSA 4 to make them contact the housing 1. Since the flexible shielding material 6 is a flexible material, it functions to eliminate the gaps generated by rigid contact and further reduce electromagnetic wave leakage, and the spacer I 5 and the flexible shielding material 6 form the second shielding wall. The spacer II and the spacer III are placed in the second slot 1-4, at the middle ends of the TOSA 3 and ROSA 4, and can be configured to cover the chamber and be attached to the housing 1. The spacer II and the spacer III can wrap and contact the TOSA 3 and ROSA 4 to make them contact the housing 1. The spacer II and the spacer III function as the first shielding wall. The principle of this electromagnetic interference shielding device is that the isolation shielding is multi-segmented, and for the leakage points, the materials can be filled for isolation shielding.

[0044] To achieve the EMI interference shielding effect, the flexible shielding material 6 uses materials that can be deformed, have electromagnetic absorption function or electromagnetic shielding function, or other materials with appropriate conductivity can also be used;

[0045] Optionally, the flexible shielding material 6 can be made of conductive cloth; the conductive cloth is doped with metal wires during the fabric weaving process; or metal powder is deposited on the fabric surface to form a conductive layer;

[0046] In this embodiment, setting the flexible shielding material 6 can effectively limit or prevent EMI from passing through the spacer I 5.

[0047] In a further technical solution, the spacer is made of stainless steel or copper-plated board, and metal materials with appropriate conductivity can be used; the spacer includes the spacer I 5, the spacer II 7, and the spacer III 8;

[0048] During installation, the flexible shielding material 6 needs to be pre-attached to the spacer I 5. The outer dimension of the flexible shielding material 6 should be larger than that of the spacer I 5. The attached flexible shielding material 6 and the spacer I 5 are inserted into the first slot 1-3. After the flexible shielding material 6 and the spacer I 5 are combined, they are in interference fit with the housing 1. The spacer III 8 is pre-loaded into the second slot 1-4 of the outer shell, and then the TOSA 3 and ROSA 4 are loaded. The spacer II 7 is inserted into the second slot. The spacer II 7 and the spacer III 8 wrap the TOSA 3 and ROSA 4. After the spacer II 7 and the spacer III 8 are fitted together, they are in interference fit with the housing 1. The PCBA board 2 is connected to the rear ends of the TOSA 3 and ROSA 4. In this embodiment, it is set that the spacer can protect the rear-end circuit such as the PCBA board 2.

[0049] In some embodiments, the housing 1 adopts a split structure, including an upper cover 1-1 and a base 1-2, and the upper cover 1-1 and the base 1-2 are detachably connected; the detachable connection method can be bolt connection, snap connection or the like.

[0050] One implementable embodiment is that the interior of the base 1-2 is divided into multiple accommodation spaces. Specifically, in this embodiment, the base 1-2 includes three accommodation spaces, and each accommodation space is isolated by the housing wall; specifically, as Figure 5 shown, the first accommodation space and the second accommodation space are respectively used to accommodate the front ends of the TOSA 3 and the ROSA 4, and the third accommodation space is used to arrange the rear-end circuit structures of the TOSA 3 and the ROSA 4.

[0051] Embodiment 2

[0052] Based on Embodiment 1, this embodiment provides an optical module, adopting the electromagnetic interference shielding structure of the optical module described in Embodiment 1. The rear-end circuit structures of the TOSA 3 and the ROSA 4 are arranged in the third accommodation space of the base 1-2 to realize the shielding isolation between the front ends and the rear-end circuits of the TOSA 3 and the ROSA 4.

[0053] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0054] Although the specific implementation manners of the present invention have been described above in conjunction with the drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made without creative work by those skilled in the art are still within the protection scope of the present invention.

Claims

1. An electromagnetic interference shielding structure for an optical module, characterized in that: It includes a housing, multiple isolation sheets, and a flexible shielding material disposed on the isolation sheets; a sheet groove is provided inside the housing for fixedly arranging the isolation sheets; through holes are formed on the isolation sheets and are in contact with the outer wall of the optical transceiver module, and the isolation sheets are arranged perpendicular to the optical transceiver module for isolating the front end and the rear end of the optical transceiver module.

2. The electromagnetic interference shielding structure of an optical module according to claim 1, characterized in that: The isolation sheet includes isolation sheet I, and isolation sheet I includes a sheet-shaped body and through holes provided on the sheet-shaped body, and the inner wall of the through holes forms a tight fit with the outer wall of the front end of the optical transceiver module.

3. The electromagnetic interference shielding structure of an optical module according to claim 2, characterized in that: A notch is also provided on isolation sheet I, and positioning ribs are provided on the inner wall of the housing; the notch is set to be a convex-shaped notch, and the width of the opening of the notch is greater than the width of the bottom of the notch.

4. The electromagnetic interference shielding structure of an optical module according to claim 2, wherein: A flexible shielding material is also provided on isolation sheet I, and the structure of the flexible shielding material is the same as that of isolation sheet I, and the size of the flexible shielding material is slightly larger than the size of isolation sheet I.

5. The electromagnetic interference shielding structure of an optical module as claimed in claim 1, wherein: Multiple sheet grooves are provided inside the housing, and the sheet grooves are used for arranging the isolation sheets, and the number of the sheet grooves corresponds to the number of the arranged isolation sheets.

6. The electromagnetic interference shielding structure of an optical module according to claim 1, wherein: The inner wall of the housing in the area where the isolation sheets are arranged is provided with a shielding material.

7. The electromagnetic interference shielding structure of an optical module according to claim 1, wherein: The structure of the isolation sheet includes isolation sheet II and isolation sheet III, and isolation sheet II and isolation sheet III can be relatively inserted or attached, and a receiving space for the outer wall of the optical transceiver module is formed in the middle after relative insertion.

8. The electromagnetic interference shielding structure of an optical module according to claim 7, wherein: Isolation sheet II and isolation sheet III are respectively set to be in an E-shaped structure, and the E-shaped isolation sheets form two receiving grooves.

9. The electromagnetic interference shielding structure of an optical module according to claim 1, wherein: The housing adopts a split structure, including an upper cover and a base, and the upper cover and the base are detachably connected; the inside of the base is divided into multiple receiving spaces.

10. An optical module, characterized in that: An electromagnetic interference shielding structure for an optical module according to any one of claims 1-9 is adopted.

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