Aspheric lens, single-wavelength two-way transmission device and signal transmission system

Abstract

The utility model provides an aspherical lens, a single-wavelength bidirectional transmission device and a signal transmission system, the single-wavelength bidirectional transmission device of the signal transmission system comprises an optical fiber, a laser emitter, a laser receiver and an aspherical lens, and the aspherical lens comprises a lens main body and an off-axis deflection body integrally connected with the lens main body; in the optical axis direction of the lens body, the projection area of the off-axis deflection angle body is smaller than that of the lens body. The lens body and the off-axis deflection angle body both have positive focal power, the focusing optical axis of the lens body and the focusing optical axis of the off-axis deflection angle body are different in direction, one of the laser transmitter and the laser receiver is located on the optical axis of the lens body, and the other one is located on the optical axis of the off-axis deflection angle body. By adopting the aspheric lens, optical signals with the same wavelength can be multiplexed in the same optical fiber for transmission, a filter structure does not need to be adopted, the overall structure is simple, the single-wave laser is high in beam combining efficiency and small in size, the process can be simplified, and the cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to communication technical field especially relates to a kind of aspheric lens, single-wavelength bidirectional transmission device and signal transmission system. BACKGROUND

[0002] In the related art, the module capable of realizing single-fiber bidirectional transmission is BIDI module, and the BIDI module is a single-fiber bidirectional optical module. The single-fiber module has only one optical fiber port, and a single optical fiber transmits and receives optical signals of different wavelengths. Therefore, the BIDI optical module must be used in pairs. From the appearance, the BIDI module has only one port, and only one optical fiber is connected.

[0003] The working principle of the BIDI optical module is to filter (filter the center wavelength that is not needed) through the filter in the optical module, and complete the transmission of one wavelength optical signal and the reception of another wavelength optical signal. To achieve bidirectional communication, the other end must complete the reception of one wavelength optical signal and the transmission of another wavelength optical signal.

[0004] However, the BIDI optical module has the problems of complex structure, low beam combining efficiency, large size, complex process, and high processing cost due to the need for multiple filters. UTILITY MODEL CONTENT

[0005] The technical purpose of the utility model is to provide an aspheric lens, a single-wavelength bidirectional transmission device, and a signal transmission system, which aims to solve at least one of the problems of the single-fiber bidirectional transmission module mentioned in the background art.

[0006] To solve the above technical problems, the utility model is implemented as follows: an aspheric lens is provided, which includes a lens main body and an off-axis angle body integrally connected to the lens main body. In the direction of the optical axis of the lens main body, the projection area of the off-axis angle body is smaller than the projection area of the lens main body. The lens main body and the off-axis angle body both have positive focal power, and the focusing optical axis of the lens main body and the focusing optical axis of the off-axis angle body are different.

[0007] Further, at least two off-axis angle bodies are provided on the lens main body.

[0008] The off-axis angle bodies are arranged at intervals around the center of the lens main body, and / or the off-axis angle bodies are arranged at intervals in the radial direction of the lens main body.

[0009] Further, the off-axis angle body is annular.

[0010] Alternatively, the off-axis angle body is in the shape of a convex block, and its surface is smooth.

[0011] Or, the off-axis deflection body is a metasurface structure arranged on the lens body, the metasurface structure comprises a plurality of microstructure units arranged at intervals, the height of the metasurface microstructure unit is 400nm-1800nm, and the diameter is 100nm-600nm.

[0012] Further, the aspheric lens adopts a plastic optical material.

[0013] The lens body satisfies the conditions that the refractive index is between 1.5-1.7, the Abbe number is greater than 30, the numerical aperture NA is less than 0.2, and the surface type is spherical or aspherical.

[0014] The off-axis deflection body satisfies the conditions that the refractive index is between 1.5-1.7, the Abbe number is greater than 30, the numerical aperture NA is less than 0.2, the ratio of the single-sided surface area of the off-axis deflection body to the single-sided surface area of the lens body is less than 20%, and the surface type is spherical or aspherical or freeform.

[0015] Further, a single-wavelength bidirectional transmission device is provided, comprising an optical fiber, a laser transmitter, a laser receiver, and an aspheric lens according to any one of the above, the aspheric lens is arranged at one end of the optical fiber, the center of the lens body of the aspheric lens is opposite to the center of the end of the optical fiber, the laser transmitter and the laser receiver are arranged on the side of the aspheric lens away from the optical fiber; wherein the laser receiver is located on the optical axis of the lens body, and the laser transmitter is located on the optical axis of the off-axis deflection body.

[0016] Further, the laser transmitter, the laser receiver, and the aspheric lens constitute a transceiver module, the single-wavelength bidirectional transmission device comprises two transceiver modules, and the two transceiver modules are respectively arranged at two ends of the optical fiber.

[0017] Further, the laser transmitter and the laser receiver are located on a plane perpendicular to the optical axis of the lens body.

[0018] Or, the laser transmitter and the laser receiver are located in the direction of the optical axis of the lens body.

[0019] Further, the laser receiver is located at the focal point of the lens body, and the laser transmitter is located at the focal point of the off-axis deflection body.

[0020] Further, the working wavelength of the single-wavelength bidirectional transmission device is any single wavelength between 800-1550nm.

[0021] Further, a signal transmission system is provided, comprising an electronic terminal and the single-wavelength bidirectional transmission device according to any one of the preceding items, and the laser transmitter and / or the laser receiver are electrically connected to the electronic terminal.

[0022] Compared with the prior art, the aspherical lens, the single-wavelength bidirectional transmission device and the signal transmission system have the beneficial effects that:

[0023] Since the aspherical lens has the lens main body and the off-axis angle body, the focusing optical axes of the lens main body and the off-axis angle body are different, when the aspherical lens is used to receive optical signals, the lens main body and the off-axis angle body can focus the optical signals at different positions, and when the aspherical lens is used to emit optical signals, the lens main body and the off-axis angle body can both collimate the optical signals and transmit the collimated optical signals in the same direction, and the lens main body and the off-axis angle body of the same aspherical lens can be used for emitting optical signals and receiving optical signals respectively.

[0024] In the single-wavelength bidirectional transmission device, the aspherical lens is applied, and one of the laser transmitter and the laser receiver is located on the optical axis of the lens main body, and the other is located on the optical axis of the off-axis angle body, so that the single-wavelength bidirectional transmission device can be applied to the transmission and reception of single-wavelength optical signals, the optical signals emitted by the laser transmitter can be collimated after passing through the aspherical lens and then transmitted by the optical fiber, and the optical signals conducted by the optical fiber to the aspherical lens can also be collimated to the corresponding laser receiver, and the transmission and reception of the optical signals will not affect each other.

[0025] It can be seen that the aspherical lens of the present application can realize multiplexing of optical signals of the same wavelength in the same optical fiber for transmission, and does not need to use a filter structure, the overall structure is simple, the single-wavelength laser beam combining efficiency is high, the volume is small, the process can be simplified, and the processing cost is lower. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the single-wavelength bidirectional transmission device in the embodiment of the present application.

[0027] In the drawings, the reference signs represent: 1, aspherical lens; 11, lens main body; 12, off-axis angle body; 2, optical fiber; 3, laser transmitter; 4, laser receiver. DETAILED DESCRIPTION

[0028] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application belong to the scope of protection of the present application.

[0029] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0030] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the present embodiment, a signal transmission system (not shown) is provided, comprising an electronic terminal and a single-wavelength bidirectional transmission device, such as Figure 1 As shown, the single-wavelength bidirectional transmission device is used to realize optical signal transmission and / or optical signal reception of the electronic terminal, and the electronic terminal can be a router, a server, an optical modem, a computer, a mobile phone, etc., as long as it can transmit or receive optical signals, which is not specifically limited here.

[0032] The single-wavelength bidirectional transmission device comprises an aspheric lens 1, an optical fiber 2, a laser transmitter 3 (Vcsel) and a laser receiver 4 (PD), the aspheric lens 1 comprises a lens body 11 and an off-axis deflection body 12 integrally connected to the lens body 11; in the direction of the optical axis of the lens body 11, the projection area of the off-axis deflection body 12 is smaller than the projection area of the lens body 11; the lens body 11 and the off-axis deflection body 12 both have positive focal power, and the focusing optical axis of the lens body 11 and the focusing optical axis of the off-axis deflection body 12 are different.

[0033] The aspheric lens 1 is arranged at one end of the optical fiber 2, the center of the lens body 11 of the aspheric lens 1 is opposite to the center of the end of the optical fiber 2, and the laser transmitter 3 and the laser receiver 4 are arranged on the side of the aspheric lens 1 away from the optical fiber 2; wherein the laser receiver 4 is located on the optical axis of the lens body 11, and the laser transmitter 3 is located on the optical axis of the off-axis angle body 12.

[0034] In the scheme, since the aspheric lens 1 has the lens body 11 and the off-axis angle body 12, the focusing optical axes of the lens body 11 and the off-axis angle body 12 are in different directions, when transmitting the optical signal, the off-axis angle body 12 can transmit the optical signal collimated by the laser transmitter 3 in the same direction, and when receiving the optical signal, the optical signal is focused by the lens body 11.

[0035] In the single-wavelength bidirectional transmission device of the scheme, the aspheric lens 1 is applied, the laser receiver 4 is located on the optical axis of the lens body 11, and the laser transmitter 3 is located on the optical axis of the off-axis angle body 12. Since the optical axes of the off-axis angle body 12 and the lens body 11 are in different directions, the scheme can be applied to the transmission and reception of single-wavelength optical signals. The optical signal emitted by the laser transmitter 3 can be collimated after passing through the aspheric lens 1 and then transmitted by the optical fiber 2, and the optical signal conducted to the aspheric lens 1 by the optical fiber 2 can also be collimated to the corresponding laser receiver 4. The transmission and reception of the optical signal do not affect each other.

[0036] It can be seen that by using the aspheric lens 1 of the present application, the same wavelength optical signal can be multiplexed in the same optical fiber 2 for transmission, and without using a filter structure, the overall structure is simple, the single-wavelength laser beam combining efficiency is high, the volume is small, and the super-precision single-point diamond super-precision machining process can be used to realize the process, which can simplify the process and reduce the processing cost.

[0037] In the embodiment, the off-axis angle body 12 is arranged on the lens body 11 of the aspheric lens 1, so that the lens body 11 and the off-axis angle body 12 can correspond to one laser receiver 4 and one laser transmitter 3 respectively, so as to realize that one receives the optical signal and the other transmits the optical signal. Specifically, the laser receiver 4 is located at the focal point of the lens body 11, and the laser transmitter 3 is located at the focal point of the off-axis angle body 12, so that the laser receiver 4 can receive the optical signal transmitted by the lens body 11, and the optical signal emitted by the laser transmitter 3 can be transmitted through the off-axis angle body 12.

[0038] Optionally, in some embodiments, at least two off-axis deflection bodies 12 can be arranged on the lens body 11; the off-axis deflection bodies 12 can be arranged in a spaced manner around the center of the lens body 11, and / or the off-axis deflection bodies 12 can be arranged in a spaced manner in the radial direction of the lens body 11. For example, three, four, five, or the like off-axis deflection bodies 12 can be arranged on the lens body 11, each off-axis deflection body 12 can be arranged in a ring around the center of the lens body 11, each off-axis deflection body 12 can be arranged in one, two, three, or the like ring, the number of off-axis deflection bodies 12 in adjacent rings can be the same or different, and the off-axis deflection bodies 12 in adjacent rings can be arranged in alignment or staggered, and the arrangement can be adjusted as needed. For another example, three, four, five, or the like off-axis deflection bodies 12 can be arranged in a spaced manner in one or more diameters of the lens body 11. It should be understood that when there are at least two off-axis deflection bodies 12, each off-axis deflection body 12 can correspond to a laser emitter 3, so that when the intensity of the light signal to be emitted is large, the light signal can be emitted by multiple laser emitters 3.

[0039] Further, when there are multiple off-axis deflection bodies 12, at least some of the off-axis deflection bodies 12 are adjacent to each other and form an off-axis deflection area, and the single-wavelength bidirectional transmission device can further include a focusing lens arranged on one side of the off-axis deflection area, and the laser emitter 3 is located at the focal point of the focusing lens, so that the light signal emitted by the laser emitter 3 can be transmitted to the multiple off-axis deflection bodies 12 in the off-axis deflection area after passing through the focusing lens, and then transmitted to the optical fiber 2 through the off-axis deflection bodies 12. Through this scheme, the area of the off-axis deflection body 12 for light transmission can be increased and the thickness of the off-axis deflection body 12 in the optical axis direction can be reduced, so as to balance the intensity of the light signal during reception or emission.

[0040] Further, in some embodiments, the off-axis deflection body 12 can be ring-shaped, and the focused light spot shape thereof can be a circular ring or a rectangular ring, and the like, and preferably a circular ring, and the laser receiver 4 and / or the laser emitter 3 can be arranged in the focused shape. The off-axis deflection body 12 can be arranged in multiple rings, and thus the focused shape thereof can have multiple rings, so that the laser emitter 3 can correspond to the corresponding off-axis deflection body 12 as needed.

[0041] In some embodiments, the off-axis deflection body 12 can be in the shape of a bump, and the surface thereof is smooth; for example, the off-axis deflection body 12 can be in the shape of a hemisphere, a semi-ellipsoid, or the like, as long as the off-axis focusing can be achieved.

[0042] In some embodiments, the off-axis deflection body 12 can be a super surface structure arranged on the lens body 11, the super surface structure comprising a plurality of microstructure units arranged at intervals, the height of the super surface microstructure unit being 400-1800 nm, and the diameter being 100-600 nm. By arranging the off-axis deflection body 12 as a super surface structure, the off-axis focusing of the light signal can be achieved through the microstructure, and the structure volume of the aspheric lens 1 can be smaller and the thickness can be smaller, which is beneficial to the miniaturization of the single-wavelength bidirectional transmission device.

[0043] The aspheric lens 1 adopts a plastic optical material. The lens body 11 satisfies the conditions that the refractive index is between 1.5 and 1.7, the Abbe number is greater than 30, the numerical aperture NA is less than 0.2, and the surface type is spherical or aspherical. The off-axis deflection body 12 satisfies the conditions that the refractive index is between 1.5 and 1.7, the Abbe number is greater than 30, the numerical aperture NA is less than 0.2, the ratio of the single-sided surface area of the off-axis deflection body 12 to the single-sided surface area of the lens body is less than 20%, and the surface type is spherical or aspherical or freeform.

[0044] Further, in the single-wavelength bidirectional transmission device, the laser transmitter 3, the laser receiver 4, and the aspheric lens 1 form a transceiver module. In this embodiment, the single-wavelength bidirectional transmission device includes two transceiver modules, which are arranged at the two ends of the optical fiber 2. It can be understood that coaxial connection structures can be arranged between the optical fiber 2 and the aspheric lens 1, between the laser receiver 4 and the aspheric lens 1, and between the laser transmitter 3 and the aspheric lens 1, as long as the coaxiality, spacing, and angle between them are guaranteed, and the specific structure can be adaptively arranged according to the actual situation. The two ends of the single-wavelength bidirectional transmission device can include signal transmission connectors, and the transceiver modules can be integrated in the signal transmission connectors. Through the single-wavelength bidirectional transmission device of the present application, each end can transmit and receive light signals, and single-fiber bidirectional transmission can be realized under the same wavelength.

[0045] In some embodiments, the single-wavelength bidirectional transmission device can be provided with the transceiver module in the present application at only one end, and the other end can use other receiving and / or transmitting schemes.

[0046] Further, in this embodiment, the laser transmitter 3 and the laser receiver 4 are located on a plane perpendicular to the optical axis of the lens body 11. It should be understood that at this time, the focal points of the lens body 11 and the off-axis deflection body 12 of the aspheric lens 1 are located on the plane, i.e., the focal lengths of the two are the same, so that the laser transmitter 3 and the laser receiver 4 can be arranged on the same plane, which is more convenient for processing.

[0047] In some embodiments, the laser transmitter 3 and the laser receiver 4 are located at different positions in the direction of the optical axis of the lens body 11. For example, the laser transmitter 3 is closer to the lens body 11 than the laser receiver 4, or the laser transmitter 3 is farther away from the lens body 11 than the laser receiver 4. In this case, the focal points of the lens body 11 of the aspheric lens 1 and the off-axis angle body 12 are located at different positions in the direction of the optical axis, that is, the focal lengths of the two are different. In this case, the laser transmitter 3 and the laser receiver 4 can be arranged at different positions in the direction of the optical axis, and the layout is more flexible.

[0048] Further, the working wavelength of the single-wavelength bidirectional transmission device is any single wavelength between 800-1550nm, for example, 940nm, 1090nm, 1440nm, etc.

[0049] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An aspherical lens, characterized in that, The lens includes a lens body and an off-axis deflector integrally connected to the lens body; in the optical axis direction of the lens body, the projected area of ​​the off-axis deflector is smaller than the projected area of ​​the lens body; both the lens body and the off-axis deflector have positive optical power, and the focusing optical axis of the lens body and the focusing optical axis of the off-axis deflector are in different directions.

2. The aspherical lens according to claim 1, characterized in that, The lens body is provided with at least two off-axis deflection bodies; The off-axis deflectors are arranged at intervals around the center of the lens body, and / or the off-axis deflectors are arranged at intervals in the radial direction of the lens body.

3. The aspherical lens according to claim 1, characterized in that, The off-axis deflector body is ring-shaped; Alternatively, the off-axis deflector body is convex in shape and has a smooth surface; Alternatively, the off-axis deflector is a metasurface structure disposed on the lens body, the metasurface structure comprising a plurality of microstructure units spaced apart, the height of the metasurface microstructure units being 400nm to 1800nm ​​and the diameter being 100nm to 600nm.

4. The aspherical lens according to claim 1, characterized in that, The aspherical lens is made of plastic optical material; The lens body meets the following conditions: refractive index between 1.5 and 1.7, Abbe number greater than 30, numerical aperture NA less than 0.2, and surface shape spherical or aspherical. The off-axis deflector body meets the following conditions: refractive index between 1.5 and 1.7, Abbe number greater than 30, numerical aperture NA less than 0.2, ratio of its single-sided surface area to the single-sided surface area of ​​the lens body less than 20%, and surface shape spherical, aspherical, or freeform.

5. A single-wavelength bidirectional transmission device, characterized in that, The system includes an optical fiber, a laser emitter, a laser receiver, and an aspherical lens as described in any one of claims 1-4. The aspherical lens is disposed at one end of the optical fiber, with the center of the lens body of the aspherical lens facing the center of the end of the optical fiber. The laser emitter and the laser receiver are disposed on the side of the aspherical lens away from the optical fiber. The laser receiver is located on the optical axis of the lens body, and the laser emitter is located on the optical axis of the off-axis deflector.

6. The single-wavelength bidirectional transmission device according to claim 5, characterized in that, The laser transmitter, the laser receiver, and the aspherical lens constitute a transceiver module. The single-wavelength bidirectional transmission device includes two transceiver modules, which are respectively located at both ends of the optical fiber.

7. The single-wavelength bidirectional transmission device according to claim 5, characterized in that, The laser emitter and the laser receiver are located on a plane perpendicular to the optical axis of the lens body; Alternatively, the laser emitter and the laser receiver may be misaligned along the optical axis of the lens body.

8. The single-wavelength bidirectional transmission device according to claim 5, characterized in that, The laser receiver is located at the focal point of the lens body, and the laser emitter is located at the focal point of the off-axis deflection body.

9. The single-wavelength bidirectional transmission device according to claim 5, characterized in that, The operating wavelength of the single-wavelength bidirectional transmission device is any single wavelength between 800 and 1550 nm.

10. A signal transmission system, characterized in that, It includes an electronic terminal and a single-wavelength bidirectional transmission device as described in any one of claims 5-9, wherein the laser transmitter and / or the laser receiver are electrically connected to the electronic terminal.

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