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

Abstract

The invention provides an aspherical lens, a single-wavelength two-way transmission device and a signal transmission system, the single-wavelength two-way transmission device of the signal transmission system comprises an optical fiber, a laser transmitter, a laser receiver and an aspherical lens, and the aspherical lens comprises a lens main body and an off-axis deflection body integrally connected to 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 present invention belongs to the field of communication technologies, and particularly relates to an aspherical lens, a single-wavelength bidirectional transmission device, and a signal transmission system. Background Art

[0002] In related technologies, the module capable of realizing single-fiber bidirectional transmission is a BIDI module. The BIDI module is a single-fiber bidirectional optical module. The single-fiber module has only one optical fiber port, and different wavelength optical signals are transmitted and received in one optical fiber. Therefore, the BIDI optical module must be used in pairs. In terms of appearance, the BIDI module has only one port and is connected by only one optical fiber.

[0003] The working principle of the BIDI optical module is to filter through a filter in the optical module (filter the unnecessary central wavelength), and at the same time complete the transmission of one wavelength optical signal and the reception of another wavelength optical signal. To achieve two-way 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 problems of complex structure, low beam combination efficiency, large volume, complex process, and high processing cost due to the need for multiple filters. Summary of the Invention

[0005] The technical object of the present invention is to provide an aspherical lens, a single-wavelength bidirectional transmission device, and a signal transmission system, aiming to solve at least one of the problems existing in the single-fiber bidirectional transmission module mentioned in the background art.

[0006] To solve the above technical problems, the present invention is implemented as follows. An aspherical lens is provided, including a lens main body and an off-axis angle body integrally connected to the lens main body; in the optical axis direction of the lens main body, the projected area of the off-axis angle body is smaller than the projected area of the lens main body; both the lens main body and the off-axis angle body have positive optical power, and the focusing optical axes of the lens main body and the off-axis angle body are in different directions.

[0007] Further, at least two of the 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 convex and has a smooth surface;

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

[0012] Further, the aspherical lens is made of a plastic optical material;

[0013] Wherein, the lens body satisfies the conditions: 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;

[0014] The off-axis deflection body satisfies the conditions: 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 unilateral surface area of the off-axis deflection body to the unilateral surface area of the lens body is less than 20%, and the surface type is spherical or aspherical or free-form surface.

[0015] Further, a single-wavelength bidirectional transmission device is provided, including an optical fiber, a laser transmitter, a laser receiver, and the aspherical lens described in any one of the above. The aspherical lens is disposed at one end of the optical fiber, and the center of the lens body of the aspherical lens is directly opposite to the center of the end of the optical fiber. The laser transmitter and the laser receiver are disposed on the side of the aspherical 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 aspherical lens form a set of transceiver modules. The single-wavelength bidirectional transmission device includes two such transceiver modules, and the two transceiver modules are respectively disposed at both 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] Alternatively, the laser transmitter and the laser receiver are misaligned 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 operating wavelength of the single-wavelength bidirectional transmission device is any single wavelength between 800 and 1550 nm.

[0021] Furthermore, a signal transmission system is provided, which includes an electronic terminal and the single-wavelength bidirectional transmission device described in any one of the above, and the laser transmitter and / or the laser receiver is 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 in the present invention have the following beneficial effects:

[0023] Since the aspherical lens has a lens body and an off-axis angle body, and the focusing optical axes of the lens body and the off-axis angle body are different, when receiving an optical signal, the lens body and the off-axis angle body can focus the optical signal at different positions respectively. When emitting an optical signal, both the lens body and the off-axis angle body can collimate the optical signal and transmit it along the same direction. Moreover, one of the lens body and the off-axis angle body of the same aspherical lens can be used to emit an optical signal while the other can be used to receive an optical signal.

[0024] In the single-wavelength bidirectional transmission device of this solution, an aspherical lens is applied, and one of the laser transmitter and the laser receiver is located on the optical axis of the lens body, and the other is located on the optical axis of the off-axis angle body. Therefore, it can be applied to the transceiver of single-wavelength optical signals. The optical signal emitted by the laser transmitter can be collimated by the aspherical lens and then transmitted by the optical fiber, and the optical signal transmitted by the optical fiber to the aspherical lens can also be collimated to the corresponding laser receiver, and the sending and receiving of the optical signal will not affect each other.

[0025] It can be seen that by adopting the aspherical lens of the present application, optical signals of the same wavelength can be multiplexed and transmitted in the same optical fiber. Moreover, without using a filter structure, the overall structure is simple, the single-wave laser beam combining efficiency is high, the volume is small, the process can be simplified, and the processing cost is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the single-wavelength bidirectional transmission device in an embodiment of the present invention.

[0027] In the drawings, each reference numeral represents: 1, aspherical lens; 11, lens body; 12, off-axis angle body; 2, optical fiber; 3, laser transmitter; 4, laser receiver. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0029] In the description of the present invention, 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", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0031] In this embodiment, a signal transmission system (not shown) is provided, which includes 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 the optical signal transmission and / or optical signal reception of the electronic terminal. The electronic terminal can be a router, a server, an optical modem, a computer, a mobile phone, etc., as long as it is an electronic device that can transmit or receive optical signals, and no specific limitation is made here.

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

[0033] The aspherical lens 1 is disposed at one end of the optical fiber 2. The center of the lens body 11 of the aspherical lens 1 is directly opposite to the center of the end of the optical fiber 2. The laser transmitter 3 and the laser receiver 4 are disposed on the side of the aspherical lens 1 away from the optical fiber 2. Among them, 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 this solution, since the aspherical 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 used to transmit optical signals, the off-axis angle body 12 can collimate the optical signals of the laser transmitter 3 and then transmit them along the same direction. When used to receive optical signals, they are focused by the lens body 11.

[0035] In the single-wavelength bidirectional transmission device of this solution, the aspherical lens 1 is applied. Moreover, 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, it can be applied to the transceiver of single-wavelength optical signals. The optical signals emitted by the laser transmitter 3 can be collimated by the aspherical lens 1 and then transmitted by the optical fiber 2, and the optical signals transmitted by the optical fiber 2 to the aspherical lens 1 can also be collimated to the corresponding laser receiver 4, and the sending and receiving of optical signals will not affect each other.

[0036] It can be seen that by adopting the aspherical lens 1 of the present application, optical signals of the same wavelength can be multiplexed and transmitted in the same optical fiber 2. Moreover, there is no need to adopt a filter structure, the overall structure is simple, the single-wave laser beam combining efficiency is high, the volume is small, it can be realized by the ultra-precision single-point diamond ultra-precision turning process, the process can be simplified, and the processing cost is lower.

[0037] In this embodiment, an off-axis angle body 12 is provided on the lens body 11 of the aspherical lens 1. Therefore, the lens body 11 and the off-axis angle body 12 can respectively correspond to a laser receiver 4 and a laser transmitter 3, so as to realize one receiving optical signals while the other sending optical signals. 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. Therefore, the laser receiver 4 can receive the optical signals transmitted by the lens body 11, and the optical signals emitted by the laser transmitter 3 can be sent through the off-axis angle body 12.

[0038] Optionally, in some embodiments, at least two off-axis deflection bodies 12 may be provided on the lens body 11; the off-axis deflection bodies 12 are arranged at intervals around the center of the lens body 11, and / or the off-axis deflection bodies 12 are arranged at intervals in the radial direction of the lens body 11. Exemplarily, for example, three, four, five, etc. off-axis deflection bodies 12 may be provided on the lens body 11, and each off-axis deflection body 12 is arranged in an array around the center of the lens body 11. Each off-axis deflection body 12 may be arranged in one, two, three, etc. circles. The number of off-axis deflection bodies 12 in adjacent circles may be the same or different, and they may be aligned or offset. The arrangement method may be adjusted adaptively according to the actual situation; for another example, the off-axis deflection bodies 12 may be arranged at equal or unequal intervals in one or more diameter directions of the lens body 11, such as three, four, five, etc. It should be understood that when there are at least two off-axis deflection bodies 12, each off-axis deflection body 12 may be correspondingly provided with a laser emitter 3. In this way, when the intensity of the optical signal to be emitted is large, the optical 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 region. The single-wavelength bidirectional transmission device may further include a focusing lens provided on one side of the off-axis deflection region. The laser emitter 3 is located at the focal point of the focusing lens. In this way, the optical signal emitted by the laser emitter 3 can be transmitted to multiple off-axis deflection bodies 12 in the off-axis deflection region through the focusing lens, and then transmitted to the optical fiber 2 through the off-axis deflection bodies 12. Through this solution, the area for the off-axis deflection bodies 12 to achieve optical transmission can be increased while the thickness of the off-axis deflection bodies 12 in the optical axis direction can be reduced, thereby balancing the intensity when receiving or emitting the optical signal.

[0040] Further, in some embodiments, the off-axis deflection body 12 may be annular. At this time, the shape of the focused light spot is annular, which may be a circular ring or a rectangular ring, etc., preferably a circular ring. The laser receiver 4 and / or the laser emitter 3 may be arranged within its focused shape. The off-axis deflection body 12 may be arranged in multiple circles. Therefore, its focused shape may have multiple circles. In this way, the laser emitter 3 can correspond to the corresponding off-axis deflection body 12 according to the actual situation.

[0041] In some embodiments, the off-axis deflection body 12 may be a convex block, and its surface is smooth; for example, the off-axis deflection body 12 may be hemispherical, semi-ellipsoidal, etc., as long as off-axis focusing can be achieved.

[0042] In some embodiments, the off-axis deflection body 12 can be a metasurface structure disposed on the lens body 11. The metasurface structure includes a plurality of microstructure units arranged at intervals. The height of the metasurface microstructure unit is 400 nm to 1800 nm, and the diameter is 100 nm to 600 nm. By setting the off-axis deflection body 12 as a metasurface structure, off-axis focusing of optical signals can be achieved through microscopic structures, which can make the structural volume and thickness of the aspherical lens 1 smaller, facilitating the miniaturization of the single-wavelength bidirectional transmission device.

[0043] The aspherical lens 1 uses a plastic optical material. Among them, the lens body 11 meets the conditions: 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 meets the conditions: 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 unilateral surface area of it to the unilateral surface area of the lens body is less than 20%, and the surface type is spherical or aspherical or free-form surface.

[0044] Furthermore, in the single-wavelength bidirectional transmission device, the laser transmitter 3, the laser receiver 4, and the aspherical lens 1 form a set of transceiver modules. In this embodiment, the single-wavelength bidirectional transmission device includes two transceiver modules, which are respectively arranged at both ends of the optical fiber 2. It can be understood that coaxial connection structures can be provided between the optical fiber 2 and the aspherical lens 1, between the laser receiver 4 and the aspherical lens 1, and between the laser transmitter 3 and the aspherical lens 1, as long as the coaxiality, spacing, and angle between them are ensured. The specific structure can be adaptively set according to the actual situation. Both ends of the single-wavelength bidirectional transmission device can include signal transmission connectors, and the transceiver modules can be integrated into the signal transmission connectors. Through the single-wavelength bidirectional transmission device of this solution, each end can emit and receive optical signals, and single-fiber bidirectional transmission can be achieved at the same wavelength.

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

[0046] Furthermore, 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 foci of the lens body 11 of the aspherical lens 1 and the off-axis deflection body 12 are both located on this plane, that is, their focal lengths are the same. In this way, 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 emitter 3 and the laser receiver 4 are misaligned in the optical axis direction of the lens body 11. For example, the laser emitter 3 is closer to the lens body 11 than the laser receiver 4, or the laser emitter 3 is farther from the lens body 11 than the laser receiver 4. At this time, the positions of the foci of the lens body 11 of the aspherical lens 1 and the off-axis angle body 12 in the optical axis direction are different, that is, their focal lengths are different. At this time, the laser emitter 3 and the laser receiver 4 can be arranged at different positions in the optical axis direction, and their layout is more flexible.

[0048] Further, the working wavelength of the single-wavelength bidirectional transmission device of the present application is any single wavelength between 800 and 1550 nm, such as: 940 nm, 1090 nm, 1440 nm, etc.

[0049] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An aspheric lens, characterized in that: It comprises a lens body and an off-axis deflection body integrally connected to the lens body; in the optical axis direction of the lens body, the projection area of ​​the off-axis deflection body is smaller than the projection area of ​​the lens body; the lens body and the off-axis deflection body both have positive optical focal length, and the focusing optical axis of the lens body and the focusing optical axis of the off-axis deflection body are in different directions.

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

3. The aspheric lens according to claim 1, characterized in that: The off-axis angle body is annular; Alternatively, the off-axis angled body is convex and has a smooth surface; Alternatively, the off-axis deflection body is a super surface structure arranged on the lens body, the super surface structure includes a plurality of micro structure units arranged at intervals, and the height of the super surface micro structure unit is 400nm to 1800nm, and the diameter is 100nm to 600nm.

4. The aspheric lens according to claim 1, characterized in that: The aspheric lens is made of plastic optical material; The lens body meets the following conditions: 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 shape is spherical or aspherical; The off-axis deflection body meets the following conditions: 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 its single-side surface area to the single-side surface area of ​​the lens body is less than 20%, and the surface shape is spherical, aspherical or free-form.

5. A single-wavelength bidirectional transmission device, characterized in that: It comprises an optical fiber, a laser transmitter, a laser receiver and an aspheric lens as described in any one of claims 1 to 4, wherein 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, and 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.

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 group of transceiver modules. The single-wavelength bidirectional transmission device includes two transceiver modules, and the two transceiver modules are respectively arranged at the two ends of the optical fiber.

7. The single-wavelength bidirectional transmission device according to claim 5, characterized in that: The laser transmitter and the laser receiver are located on a plane perpendicular to the optical axis of the lens body; Alternatively, the laser transmitter and the laser receiver are misaligned in the direction of 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 focus of the lens body, and the laser transmitter is located at the focus of the off-axis deflection body.

9. The single-wavelength bidirectional transmission device according to claim 5, characterized in that: The working 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 comprises an electronic terminal and the single-wavelength bidirectional transmission device as claimed in any one of claims 5 to 9, wherein the laser transmitter and / or the laser receiver is electrically connected to the electronic terminal.

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