A multimode lens and high-speed multimode optical module for speeds above 400G

Abstract

This utility model relates to a multimode lens for speeds above 400G. The lens substrate has a first and a second connector, respectively, on its two end faces along its length, matching a ferrule. Between the first and second connectors, the lens substrate has two V-shaped, outward-facing reflective surfaces. At the bottom of the lens substrate, corresponding to each reflective surface, are a first TX array lens and a first RX array lens. On the wall of the first connector, at the corresponding reflective surface, and on the wall of the second connector, at the corresponding reflective surface, are second TX array lenses and second RX array lenses. A high-speed multimode optical module is also provided, with a multimode lens fixed to the front or back of a PCB board. The first ferrule is inserted into the first or second connector. The advantages are: this multimode lens can accommodate two layouts, requiring only one mold, effectively saving costs.

Description

Technical Field

[0001] This utility model relates to the field of optical module technology, specifically to a multimode lens and high-speed multimode optical module for speeds above 400G. Background Technology

[0002] The structure of a traditional high-speed multimode optical module is as follows: Figure 1 As shown, the lens used has a socket on one end face that matches the ferrule. The lens has a reflective surface at the corresponding socket, and the reflective surface is usually tilted at 45°. The bottom of the lens has a first cavity to make way for the chip. The top of the first cavity has a first TX array lens and a first RX array lens at the corresponding reflective surface. The wall of the socket has a second TX array lens. The first TX array lens is coupled to the second TX array lens through the reflective surface. The wall of the socket has a second RX array lens. The second RX array lens is coupled to the first RX array lens through the reflective surface.

[0003] As high-speed multimode optical modules achieve increasingly higher speeds, it is necessary to reduce the junction capacitance of the chip to ensure high-frequency performance. This results in the photosensitive surface of optical chips, such as photodetectors, becoming smaller and more difficult to couple. Therefore, the TX optical path (mainly the first TX array lens and the second TX array lens) and RX optical path (mainly the first RX array lens and the second RX array lens) of the lenses used in multimode optical modules with speeds above 400G are incompatible. They are designed with separate surface types. That is, the TX optical path of the lens can only be used for TX optical chips, and the RX optical path can only be used for RX optical chips (PD). In reality, due to differences in high-speed line interconnects between different DSP chips or to achieve higher heat dissipation, the optoelectronic chips are placed on the back of the PCB board, resulting in the TX and RX optical paths being interchanged. Figure 2 , Figure 3 As shown, this causes incompatibility, requiring the creation of a new lens mold to adapt to the new TX and RX layout, resulting in higher costs. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a multimode lens and high-speed multimode optical module for speeds above 400G, so as to overcome the shortcomings of the prior art.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A multimode lens for speeds above 400G includes: a lens substrate, a first insertion interface and a second insertion interface that match a ferrule on two end faces along the length direction, two V-shaped reflective surfaces with outward openings on the lens substrate between the first insertion interface and the second insertion interface, a first TX array lens and a first RX array lens respectively provided at each reflective surface at the bottom of the lens substrate, the two first TX array lenses and the two first RX array lenses being symmetrically distributed, a second TX array lens and a second RX array lens provided at the corresponding reflective surfaces on the wall of the first insertion interface and at the corresponding reflective surfaces on the wall of the second insertion interface, the two second TX array lenses and the two second RX array lenses being symmetrically distributed.

[0006] The beneficial effects of this utility model are: This multimode lens has a first connector matching the ferrule on one of its two end faces along its length, and a second connector matching the ferrule on the other end face. It also incorporates two reflective surfaces, two first TX array lenses, two first RX array lenses, two second TX array lenses, and two second RX array lenses, all symmetrically distributed. Therefore, when this multimode lens is used in multimode optical modules with speeds above 400G, when the multimode lens is on the front of the PCB, the first ferrule aligns with the first connector of the multimode lens. When the multimode lens is on the back of the PCB, the multimode lens is rotated 180°, and the first ferrule aligns with the second connector of the multimode lens. In this case, the positions of the TX and RX optical paths remain unchanged, allowing the multimode lens to be compatible with both layouts. Only one mold is needed, saving on mold costs and improving the utilization rate of the multimode lens.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Furthermore, the bottom of the lens substrate is provided with a first concave cavity to make way for the chip, and the first TX array lens and the first RX array lens are located at the top of the first concave cavity.

[0009] Furthermore, a second cavity is provided on the wall surface of both the first and second plug-in interfaces. The second TX array lens in the first and second plug-in interfaces is located on the cavity wall of the second cavity, and the second RX array lens in the first and second plug-in interfaces is located on the cavity wall of the second cavity.

[0010] Furthermore, both reflective surfaces are tilted at 45°, and the two reflective surfaces are perpendicular to each other.

[0011] Furthermore, the first TX array lens has four aspherical lenses, the first RX array lens has four aspherical lenses, the first RX array lens has four aspherical lenses, and the second RX array lens has four aspherical lenses.

[0012] Based on the above technical solution, this utility model also provides a high-speed multimode optical module, including: a PCB board, a first ferrule and a multimode lens. A multimode lens is fixed on the front side of the PCB board, and the first ferrule is plugged into the first ferrule of the multimode lens; or, a multimode lens is fixed on the back side of the PCB board, and the first ferrule is plugged into the second ferrule of the multimode lens; an optical fiber is provided between the first ferrule and the second ferrule.

[0013] The further beneficial effects of adopting the above are: using a multimode lens can be compatible with two layouts, requiring only one set of molds, thus saving a set of molds and effectively saving costs.

[0014] Furthermore, a DSP chip is provided on the front or back of the PCB board on the side opposite to the first ferrule.

[0015] Furthermore, the front side of the PCB board has a TX optical chip coupled to the first TX array lens within the coverage area of ​​the multimode lens, and an RX optical chip coupled to the first RX array lens within the coverage area of ​​the multimode lens. The TX optical chip is coupled to the first ferrule in the first connector via the first TX array lens, the reflective surface, and the second TX array lens. The first ferrule in the first connector is coupled to the RX optical chip via the second RX array lens, the reflective surface, and the first RX array lens. The front side of the PCB board has a TX electrical chip and an RX electrical chip that are electrically connected to the TX optical chip and the RX optical chip, respectively, within the coverage area of ​​the multimode lens.

[0016] Furthermore, on the back of the PCB board, within the coverage area of ​​the multimode lens, there is a TX optical chip coupled to the first TX array lens, and on the back of the PCB board, within the coverage area of ​​the multimode lens, there is an RX optical chip coupled to the first RX array lens. The TX optical chip is coupled to the first ferrule in the second connector via the first TX array lens, the reflective surface, and the second TX array lens. The first ferrule in the second connector is coupled to the RX optical chip via the second RX array lens, the reflective surface, and the first RX array lens. On the back of the PCB board, within the coverage area of ​​the multimode lens, there are TX electrical chips and RX electrical chips that are electrically connected to the TX optical chip and the RX optical chip, respectively.

[0017] Furthermore, an optical fiber is provided between the first ferrule and the second ferrule. Attached Figure Description

[0018] Figure 1 This is a structural diagram of a high-speed multimode optical module in the existing technology; Figure 2 This is a simplified top view of the positions of the TX and RX optical paths on the front of a PCB board in the prior art. Figure 3 This is a simplified bottom view of the positions of the TX and RX optical paths on the back of a PCB board in the prior art. Figure 4 This is a structural diagram of the multimode lens used for speeds above 400G in this invention regarding the TX optical path; Figure 5 This is a structural diagram of the multimode lens used for speeds above 400G in this invention regarding the RX optical path; Figure 6 This is a structural diagram of the high-speed multimode optical module with respect to the TX optical path when the multimode lens is located on the front of the PCB board in this utility model; Figure 7 This is a structural diagram of the high-speed multimode optical module with respect to the RX optical path when the multimode lens is located on the front of the PCB board in this utility model; Figure 8 This is a structural diagram of the high-speed multimode optical module with respect to the TX optical path when the multimode lens is located on the back of the PCB board in this utility model; Figure 9 This is a structural diagram of the high-speed multimode optical module with respect to the RX optical path when the multimode lens is located on the back of the PCB board in this utility model.

[0019] The attached diagram lists the components represented by each number as follows: 1. Multimode lens; 101. Lens substrate; 102. First jack; 103. Second jack; 104. Reflecting surface; 105. First TX array lens; 106. First RX array lens; 107. Second TX array lens; 108. Second RX array lens; 109. First cavity; 110. Second cavity; 2. PCB board; 3. First ferrule; 4. TX optical chip; 5. RX optical chip; 6. TX electrical chip; 7. RX electrical chip; 8. Second ferrule; 9. Optical fiber; 10. DSP chip. Detailed Implementation

[0020] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0021] Example 1 like Figure 4 , Figure 5As shown, a multimode lens for speeds above 400G includes: a lens substrate 101, wherein one end face of the lens substrate 101 in the length direction is provided with a first insertion interface 102 that matches the insert (i.e., the subsequent first insert 3), and the other end face is provided with a second insertion interface 103 that matches the insert (i.e., the subsequent first insert 3). Two inclined reflective surfaces 104 are provided on the lens substrate 101 between the first insertion interface 102 and the second insertion interface 103. The reflective surface 104 closer to the first insertion interface 102 is adapted to the first insertion interface 102, while the reflective surface 104 closer to the second insertion interface 103 is adapted to the second insertion interface 103. The two reflective surfaces 104 are distributed in a V-shape with the opening facing outward. At the bottom of the lens substrate 101, a first TX array lens 105 is provided at each corresponding reflective surface 104, and a first RX array lens 106 is provided at each corresponding reflective surface 104 at the bottom of the lens substrate 101 along its width direction. The first TX array lens 105 and the first RX array lens 106 are both distributed along the width direction of the lens substrate 101. Since there are two reflective surfaces 104, there are two first TX array lenses 105 and two first RX array lenses 106. The two first TX array lenses 105 are symmetrically distributed, and the two first RX array lenses 106 are also symmetrically distributed. A second TX array lens 107 is provided on the wall surface of the first insertion interface 102. The first TX array lens 105 is coupled to the second TX array lens 107 via the reflective surface 104. The second TX array lens 107 is distributed along the width direction of the lens base 101. A second TX array lens 107 is also provided on the wall surface of the second insertion interface 103. Similarly, the first TX array lens 105 is coupled to the second TX array lens 107 via the reflective surface 104. The second TX array lens 107 is distributed along the width direction of the lens base 101. A second RX array lens 108 is provided on the wall surface of the first insertion interface 102. The second RX array lens 108 is coupled to the first RX array lens 106 via the reflective surface 104. The second RX array lens 108 is coupled along the width direction of the lens substrate 101; the second RX array lens 108 is provided on the wall of the second insertion interface 103. Similarly, the second RX array lens 108 is coupled to the first RX array lens 106 through the reflective surface 104. The second RX array lens 108 is distributed along the width direction of the lens substrate 101. Since it has two reflective surfaces 104, two first TX array lenses 105 and two first RX array lenses 106, it also has two second TX array lenses 107 and two second RX array lenses 108. The two second TX array lenses 107 are symmetrically distributed and the two second RX array lenses 108 are also symmetrically distributed.

[0022] The multimode lens has a first insertion interface 102 matching the ferrule on one of its two end faces along its length, and a second insertion interface 103 matching the ferrule on the other end face. It also includes two reflecting surfaces 104, two first TX array lenses 105, two first RX array lenses 106, two second TX array lenses 107, and two second RX array lenses 108. Lenses 108 are symmetrically distributed. Therefore, when this multimode lens is applied to a multimode optical module with a speed of 400G or higher, when the multimode lens is on the front side of the PCB board 2, the first ferrule 3 is connected to the first connector 102 of the multimode lens. When the multimode lens is on the back side of the PCB board 2, the multimode lens is rotated 180° and the first ferrule 3 is connected to the second connector 103 of the multimode lens. At this time, the positions of the TX optical path and the RX optical path remain unchanged, so that the multimode lens can be compatible with two layouts and only one mold is needed, thereby saving a mold and effectively saving costs.

[0023] Example 2 like Figure 4 , Figure 5 As shown, this embodiment is a further improvement on embodiment 1, as detailed below: The bottom of the lens substrate 101 is provided with a first concave cavity 109 to make way for the chip. The first TX array lens 105 is located at the top of the first concave cavity 109, and the first RX array lens 106 is also located at the top of the first concave cavity 109.

[0024] Example 3 like Figure 4 , Figure 5 As shown, this embodiment is a further improvement on embodiment 1 or 2, as detailed below: The first connector 102 has a second cavity 110 on its wall surface, and the second connector 103 also has a second cavity 110 on its wall surface. The second TX array lens 107 in the first connector 102 is located on the cavity wall of the second cavity 110, and the second TX array lens 107 in the second connector 103 is also located on the cavity wall of the second cavity 110. The second RX array lens 108 in the first connector 102 is located on the cavity wall of the second cavity 110, and the second RX array lens 108 in the second connector 103 is also located on the cavity wall of the second cavity 110.

[0025] Example 4 like Figure 4 , Figure 5 As shown, this embodiment is a further improvement on embodiment 1, 2, or 3, as detailed below: The two reflective surfaces 104 are tilted at an angle of 45° and are perpendicular to each other.

[0026] Furthermore, the first TX array lens 105 has four aspherical lenses, the first RX array lens 106 has four aspherical lenses, and the second RX array lens 108 has four aspherical lenses, thus enabling four-channel reception and four-channel transmission.

[0027] Example 5 like Figures 6-9 As shown, a high-speed multimode optical module includes: a PCB board 2, a first ferrule 3, and a multimode lens 1 as described in any of embodiments 1 to 4; A multimode lens 1 is fixed on the front side of the PCB board 2. The first ferrule 3 is inserted into the first insertion interface 102 of the multimode lens 1. An optical fiber 9 is provided between the first ferrule 3 and the second ferrule 8. For the emitted light, the emitted light is coupled upward through the first TX array lens 105 to the reflecting surface 104, and then coupled to the second TX array lens 107 after the reflecting surface 104 changes angle. Finally, it is coupled by the second TX array lens 107 into the optical fiber 9 in the first ferrule 3 that is plugged into the first insertion interface 102. For the received light, the received light in the optical fiber 9 in the first ferrule 3 is coupled to the reflecting surface 104 via the second RX array lens 108, and then coupled to the first RX array lens 106 after the reflecting surface 104 turns downward at an angle, and finally coupled into the RX optical chip 5 via the first RX array lens 106. Alternatively, a multimode lens 1 is fixed on the back of the PCB board 2, the first ferrule 3 is inserted into the second ferrule 103 of the multimode lens 1, and an optical fiber 9 is provided between the first ferrule 3 and the second ferrule 8.

[0028] Furthermore, a DSP chip 10 is provided on the front or back of the PCB board 2 on the side opposite to the first insert 3.

[0029] Example 6 like Figure 6 , Figure 7 As shown, this embodiment is a further improvement on embodiment 5, as detailed below: On the front side of PCB board 2, within the coverage area of ​​multimode lens 1, there is a TX optical chip 4 coupled to the first TX array lens 105. On the front side of PCB board 2, within the coverage area of ​​multimode lens 1, there is an RX optical chip 5 coupled to the first RX array lens 106. The TX optical chip 4 is coupled to the first ferrule 3 in the first insertion interface 102 via the first TX array lens 105, the reflective surface 104, and the second TX array lens 107. For the emitted light, the emitted light of the TX optical chip 4 is coupled upward through the first TX array lens 105 to the reflective surface 104, and then coupled to the second TX array lens 107 after the reflective surface 104 turns the angle. Finally, it is coupled by the second TX array lens 107 into the optical fiber 9 in the first ferrule 3 that is inserted into the first insertion interface 102. The first ferrule 3 in the first ferrule 102 is coupled to the RX optical chip 5 via the second RX array lens 108, the reflective surface 104, and the first RX array lens 106. For the received light, the received light in the optical fiber 9 in the first ferrule 3 is coupled to the reflective surface 104 via the second RX array lens 108, and then coupled to the first RX array lens 106 after the reflective surface 104 turns downward, and finally coupled into the RX optical chip 5 by the first RX array lens 106. On the front side of PCB board 2, within the coverage area of ​​multimode lens 1, there is a TX electrical chip 6 electrically connected to TX optical chip 4, and on the front side of PCB board 2, within the coverage area of ​​multimode lens 1, there is an RX electrical chip 7 electrically connected to RX optical chip 5.

[0030] Example 7 like Figure 8 , Figure 9 As shown, this embodiment is a further improvement on embodiment 5, as detailed below: On the back of PCB 2, within the coverage area of ​​multimode lens 1, there is a TX light chip 4 coupled to the first TX array lens 105. On the back of PCB 2, within the coverage area of ​​multimode lens 1, there is an RX light chip 5 coupled to the first RX array lens 106. The TX light chip 4 is coupled to the first ferrule 3 in the second connector 103 via the first TX array lens 105, the reflective surface 104, and the second TX array lens 107. For the emitted light, the emitted light of the TX optical chip 4 is coupled downward through the first TX array lens 105 to the reflecting surface 104, and then coupled to the second TX array lens 107 after the reflecting surface 104 turns the angle. Finally, it is coupled by the second TX array lens 107 into the optical fiber 9 in the first ferrule 3 that is plugged into the second ferrule 103. The first ferrule 3 in the second ferrule 103 is coupled to the RX optical chip 5 via the second RX array lens 108, the reflective surface 104, and the first RX array lens 106. For the received light, the received light in the optical fiber 9 in the first ferrule 3 is coupled to the reflective surface 104 via the second RX array lens 108, and then coupled to the first RX array lens 106 after the reflective surface 104 turns upward, and finally coupled into the RX optical chip 5 by the first RX array lens 106. On the back of PCB 2, within the coverage area of ​​multimode lens 1, there is a TX electrical chip 6 electrically connected to TX optical chip 4, and on the back of PCB 2, within the coverage area of ​​multimode lens 1, there is an RX electrical chip 7 electrically connected to RX optical chip 5.

[0031] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multimode lens for speeds above 400G, characterized in that, include: A lens substrate (101) has a first insertion interface (102) and a second insertion interface (103) that match the ferrule on two end faces along its length. Two V-shaped, outward-facing reflecting surfaces (104) are provided between the first insertion interface (102) and the second insertion interface (103) on the lens substrate (101). At the bottom of the lens substrate (101), a first TX array lens (105) and a first R array lens (104) are respectively provided at each reflecting surface (104). The X-array lens (106), the two first TX array lenses (105) and the two first RX array lenses (106) are symmetrically distributed. The first plug-in interface (102) is provided with a second TX array lens (107) and a second RX array lens (108) at the corresponding reflective surface (104) on the wall surface of the first plug-in interface (102) and at the corresponding reflective surface (104) on the wall surface of the second plug-in interface (103). The two second TX array lenses (107) and the two second RX array lenses (108) are symmetrically distributed.

2. A multimode lens for speeds above 400G according to claim 1, characterized in that, The bottom of the lens substrate (101) is provided with a first recess (109) to make way for the chip, and the first TX array lens (105) and the first RX array lens (106) are located at the top of the first recess (109).

3. A multimode lens for speeds above 400G according to claim 1, characterized in that, The first connector (102) and the second connector (103) are provided with a second cavity (110) on their walls. The second TX array lens (107) in the first connector (102) and the second connector (103) is located on the cavity wall of the second cavity (110), and the second RX array lens (108) in the first connector (102) and the second connector (103) is located on the cavity wall of the second cavity (110).

4. A multimode lens for speeds above 400G according to claim 1, 2, or 3, characterized in that, The two reflective surfaces (104) are tilted at an angle of 45° and are perpendicular to each other.

5. A multimode lens for speeds above 400G according to claim 1, 2, or 3, characterized in that, The first TX array lens (105) has four aspherical lenses, the first RX array lens (106) has four aspherical lenses, and the second RX array lens (108) has four aspherical lenses.

6. A high-speed multimode optical module, characterized in that, include: The PCB board (2), the first ferrule (3), and the multimode lens (1) as described in any one of claims 1 to 4, wherein a multimode lens (1) is fixed on the front side of the PCB board (2), and the first ferrule (3) is inserted into the first insertion interface (102) of the multimode lens (1), or a multimode lens (1) is fixed on the back side of the PCB board (2), and the first ferrule (3) is inserted into the second insertion interface (103) of the multimode lens (1); an optical fiber (9) is provided between the first ferrule (3) and the second ferrule (8).

7. A high-speed multimode optical module according to claim 6, characterized in that, The PCB board (2) has a DSP chip (10) on the front or back side away from the first insert (3).

8. A high-speed multimode optical module according to claim 6, characterized in that, The front side of the PCB board (2) is provided with a TX optical chip (4) coupled to the first TX array lens (105) within the coverage area of ​​the multimode lens (1). The front side of the PCB board (2) is provided with an RX optical chip (5) coupled to the first RX array lens (106) within the coverage area of ​​the multimode lens (1). The TX optical chip (4) is coupled to the first ferrule (3) in the first connector (102) via the first TX array lens (105), the reflective surface (104), and the second TX array lens (107). The first ferrule (3) in the first connector (102) is coupled to the RX optical chip (5) via the second RX array lens (108), the reflective surface (104), and the first RX array lens (106). The front side of the PCB board (2) is provided with a TX electrical chip (6) and an RX electrical chip (7) respectively electrically connected to the TX optical chip (4) and the RX optical chip (5) within the coverage area of ​​the multimode lens (1).

9. A high-speed multimode optical module according to claim 6, characterized in that, The back of the PCB board (2) is provided with a TX optical chip (4) coupled to the first TX array lens (105) in the coverage area of ​​the multimode lens (1). The back of the PCB board (2) is provided with an RX optical chip (5) coupled to the first RX array lens (106) in the coverage area of ​​the multimode lens (1). The TX optical chip (4) is coupled to the first ferrule (3) in the second connector (103) via the first TX array lens (105), the reflective surface (104), and the second TX array lens (107). The first ferrule (3) in the second connector (103) is coupled to the RX optical chip (5) via the second RX array lens (108), the reflective surface (104), and the first RX array lens (106). The back of the PCB board (2) is provided with a TX electrical chip (6) and an RX electrical chip (7) respectively electrically connected to the TX optical chip (4) and the RX optical chip (5) in the coverage area of ​​the multimode lens (1).

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