Radio frequency fiber optic transmission system

Abstract

The utility model discloses a radio frequency optical fiber transmission system includes remote optical transmitter and at least one near end optical receiver, and remote optical transmitter is used for receiving radio frequency signal and converts received radio frequency signal into optical signal, and remote optical transmitter is equipped with radio frequency signal input, and near end optical receiver is connected with remote optical transmitter through optical fiber wire, and near end optical receiver is used for receiving optical signal and converts into radio frequency signal, and near end optical receiver is equipped with radio frequency signal output, wherein, remote optical transmitter is equipped with first power input unit, first anti -reversing unit, first power indicator light unit, first voltage stabilizing unit, feed unit, first impedance matching unit, first optical signal radio frequency signal conversion unit, optical power automatic control unit and first optical indicator light unit. The utility model has can reduce signal attenuation, can realize long distance signal transmission and so on advantage.

Description

Technical Field

[0001] This utility model belongs to the technical field of fiber optic remote extension systems, specifically relating to a radio frequency fiber optic transmission system. Background Technology

[0002] Radio frequency fiber optic transmission systems are a technology that transmits radio frequency signals through optical fibers. It combines the advantages of radio frequency technology and optical fiber communication and has wide applications in wireless communication, radar, cable television, satellite communication and other fields.

[0003] Radio frequency fiber optic transmission systems mainly consist of three core components: the transmitter, the receiver, and the transmission medium. Existing radio frequency fiber optic transmission systems still suffer from problems such as severe signal attenuation. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model provides a radio frequency fiber optic transmission system that reduces signal attenuation and enables long-distance signal transmission.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] Radio frequency fiber optic transmission system, including:

[0007] A remote optical transmitter is used to receive radio frequency signals and convert the received radio frequency signals into optical signals. The remote optical transmitter is equipped with a radio frequency signal input port.

[0008] And at least one near-end optical receiver, which is connected to the far-end optical transmitter via an optical fiber. The near-end optical receiver is used to receive optical signals and convert them into radio frequency signals. The near-end optical receiver is provided with a radio frequency signal output port.

[0009] The remote optical transmitter includes a first power input unit, a first reverse connection protection unit, a first power indicator unit, a first voltage regulator unit, a power supply unit, a first impedance matching unit, a first optical signal RF signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. The first power input unit is connected to the first reverse connection protection unit. The first reverse connection protection unit is connected to the first power indicator unit and the first voltage regulator unit. The first voltage regulator unit is connected to the power supply unit and the first optical signal RF signal conversion unit. The power supply unit is connected to the RF signal input port. The first impedance matching unit is connected to the RF signal input port and the first optical signal RF signal conversion unit. The first optical signal RF signal conversion unit is connected to the optical power automatic control unit and the first optical indicator unit.

[0010] The near-end optical receiver includes a second power input unit, a second reverse connection protection unit, a second power indicator unit, a second voltage regulator unit, a second optical signal RF signal conversion unit, a second impedance matching unit, a signal amplification unit, and a second optical indicator unit. The second power input unit is connected to the second reverse connection protection unit. The second reverse connection protection unit is connected to the second power indicator unit and the second voltage regulator unit. The second voltage regulator unit is connected to the second optical signal RF signal conversion unit and the signal amplification unit. The signal amplification unit is connected to the second impedance matching unit and the RF signal output port. The second optical signal RF signal conversion unit is connected to the second impedance matching unit and the second optical indicator unit. The second optical signal RF signal conversion unit is connected to the first optical signal RF signal conversion unit via optical fiber.

[0011] Preferably, it also includes an optical splitter. When the number of near-end optical receivers is greater than or equal to 2, the far-end optical transmitter is connected to the optical splitter via an optical fiber, and the optical splitter is connected to the near-end optical receiver via an optical fiber.

[0012] By adopting the above technical solution, this utility model has the following beneficial effects:

[0013] The remote optical transmitter of this utility model is equipped with a first voltage stabilizing unit, a power feeding unit, a first impedance matching unit, a first optical signal-to-radio frequency signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. In specific applications, impedance matching can be used to complete the conversion of radio frequency signals to optical signals.

[0014] Similarly, the near-end optical receiver is equipped with a second voltage regulation unit, a second optical signal-to-RF signal conversion unit, a second impedance matching unit, a signal amplification unit, and a second optical indicator unit. In specific applications, it can convert optical signals into RF signals, amplify signals after impedance matching, and prevent signal attenuation, thus enabling long-distance transmission. Moreover, this invention is equipped with an optical splitter, which can not only extend the signal transmission from one far-end optical transmitter to one near-end optical receiver, but also extend the signal transmission from one far-end optical transmitter to multiple near-end optical receivers.

[0015] In summary, this invention has advantages such as reducing signal attenuation and enabling long-distance signal transmission. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the remote optical transmitter of this utility model;

[0018] Figure 3 This is a modular block diagram of the structure inside the remote optical transmitter of this utility model;

[0019] Figure 4 This is the optical path and circuit schematic diagram of the remote optical transmitter of this utility model;

[0020] Figure 5 This is a schematic diagram of the near-end optical receiver of this utility model;

[0021] Figure 6 This is a block diagram of the internal structure of the near-end optical receiver of this utility model;

[0022] Figure 7 This is the optical path and circuit schematic diagram of the near- and far-end optical receiver of this utility model. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0025] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Example 1

[0029] In this embodiment, a radio frequency fiber optic transmission system is proposed, which can realize the transmission of radio frequency signals over long distances. Moreover, it can not only realize the signal transmission from a remote optical transmitter to a near-end optical receiver, but also realize the signal transmission from a remote optical transmitter to multiple near-end optical receivers through an optical splitter.

[0030] like Figures 1-7 As shown, in one embodiment of this utility model, the radio frequency optical fiber transmission system of this utility model includes a far-end optical transmitter and at least one near-end optical receiver. The far-end optical transmitter is used to receive radio frequency signals and convert the received radio frequency signals into optical signals. The far-end optical transmitter is provided with a radio frequency signal input port. The near-end optical receiver is connected to the far-end optical transmitter through an optical fiber line. The near-end optical receiver is used to receive optical signals and convert them into radio frequency signals. The near-end optical receiver is provided with a radio frequency signal output port. In specific applications, the far-end optical transmitter of this utility model is connected to an external upper-level device. The upper-level device can input radio frequency signals to the far-end optical transmitter, while the near-end optical receiver can be connected to an external lower-level device. The lower-level device can receive the radio frequency signals from the near-end optical receiver. The upper-level device inputs radio frequency signals to the far-end optical transmitter. The far-end optical transmitter converts the radio frequency signals into optical signals and transmits them to the near-end optical receiver through an optical fiber line. The near-end optical receiver converts the optical signals into radio frequency signals and outputs them to the lower-level device after signal amplification.

[0031] Specific reference Figure 2 The following is a specific structural example of the remote optical transmitter of this utility model. The remote optical transmitter is equipped with an RF IN interface (i.e., radio frequency signal input port), a DC IN interface, an optical output interface, an optical indicator LED, and a power indicator LED. See also... Figure 3 and Figure 4 The remote optical transmitter is equipped with a first power input unit, a first reverse connection protection unit, a first power indicator unit, a first voltage regulator unit, a power supply unit, a first impedance matching unit, a first optical signal RF signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. The first power input unit is connected to the first reverse connection protection unit. The first reverse connection protection unit is connected to the first power indicator unit and the first voltage regulator unit. The first voltage regulator unit is connected to the power supply unit and the first optical signal RF signal conversion unit. The power supply unit is connected to the RF signal input port. The first impedance matching unit is connected to the RF signal input port and the first optical signal RF signal conversion unit. The first optical signal RF signal conversion unit is connected to the optical power automatic control unit and the first optical indicator unit.

[0032] It is understood that the first power input unit includes a DC IN interface and connects to an external power adapter through the DC IN interface. The power adapter is connected to the mains power. Specifically, 220V AC power is converted to 12V DC power by the power adapter and enters the remote optical transmitter through the DC IN interface. After passing through the first reverse connection protection unit (the first reverse connection protection unit is used to ensure that the remote optical transmitter of this utility model will not be burned even if the positive and negative terminals of the power supply are reversed), one path enters the first power indicator unit. When the power indicator LED is green, it indicates that the power supply is normal; otherwise, the power supply is abnormal. The other path reaches the first voltage regulator unit, so that a stable 5V DC voltage can be obtained, which can then supply the various unit modules inside the remote optical transmitter of this utility model, such as the power supply unit and the first optical signal RF signal conversion unit. When powering the power supply unit, the 5V power is output through the power supply unit from the RFIN interface (RF signal input port) to power the upstream equipment.

[0033] The radio frequency (RF) signal (mainly 50-3000MHz) enters the remote optical transmitter through the RF IN interface, then undergoes impedance matching through the first impedance matching unit. Next, the signal enters the LD- of the laser diode in the first optical signal-RF signal conversion unit, completing the RF signal-to-optical signal conversion, and is finally output through the optical output interface. Simultaneously, the PD- of the laser diode in the first optical signal-RF signal conversion unit also receives the optical signal. One path is controlled by the optical power automatic control unit to adjust the output power of the laser diode in real time, maintaining a stable power output. The other path enters the first optical indicator unit to indicate whether there is an optical signal output. When there is an optical signal output, the optical indicator LED lights up green; when there is no optical signal output, the optical indicator LED is off.

[0034] For more details, please refer to Figure 5 The following is a specific structural example of the near-end optical receiver of this utility model. The near-end optical receiver is equipped with an RF OUT interface (i.e., an RF signal output port), a DC IN interface, an optical input interface, an optical indicator LED, and a power indicator LED. See also... Figure 6 and Figure 7The near-end optical receiver includes a second power input unit, a second reverse connection protection unit, a second power indicator unit, a second voltage regulator unit, a second optical signal RF signal conversion unit, a second impedance matching unit, a signal amplification unit, and a second optical indicator unit. The second power input unit is connected to the second reverse connection protection unit. The second reverse connection protection unit is connected to the second power indicator unit and the second voltage regulator unit. The second voltage regulator unit is connected to the second optical signal RF signal conversion unit and the signal amplification unit. The signal amplification unit is connected to the second impedance matching unit and the RF signal output port. The second optical signal RF signal conversion unit is connected to the second impedance matching unit and the second optical indicator unit. The second optical signal RF signal conversion unit is connected to the first optical signal RF signal conversion unit via an optical fiber.

[0035] It is understood that the second power input unit includes the DC IN interface of the near-end optical receiver and connects to an external power adapter through the DC IN interface. The power adapter is connected to the mains power. Specifically, 220V AC power is converted to 12V DC power by the power adapter and enters the near-end optical receiver through the DC IN interface. Then, after passing through the second reverse connection protection unit (the second reverse connection protection unit is used to ensure that the near-end optical receiver of this utility model will not be burned even if the positive and negative terminals of the power supply are reversed), one path enters the second power indicator unit. When the power indicator LED of the near-end optical receiver is green, it indicates that the power supply is normal; otherwise, the power supply is abnormal. The other path reaches the second voltage regulator unit, so that a stable 5V DC voltage can be obtained, which can then supply the various unit modules inside the near-end optical receiver of this utility model, such as the signal amplification unit and the second optical signal RF signal conversion unit, etc.

[0036] The number of near-end optical receivers can be one or more. When there is only one near-end optical receiver (i.e., a one-to-one connection), the optical input interface on the near-end optical receiver is connected to the optical fiber, and the other end of the optical fiber is connected to the optical output interface of the far-end optical transmitter. The far-end optical transmitter converts the radio frequency signal into an optical signal and outputs it through the optical output interface to the optical fiber, and then outputs it to the optical input interface on the near-end optical receiver. This optical input interface is connected to the second optical signal-to-radio frequency signal conversion unit. The photodiode of the second optical signal-to-radio frequency signal conversion unit converts the optical signal into a radio frequency signal, and then outputs it to the second impedance matching unit (for better signal matching with subsequent unit modules) and then enters the signal amplification unit to amplify the signal. The amplified signal is output through the RF OUT interface, which is specifically connected to the next-level device, thus completing the output of the radio frequency signal. At the same time, the optical signal received by the photodiode of the second optical signal-to-radio frequency signal conversion unit also enters the second optical indicator unit. When there is an optical signal input, the optical indicator LED of the near-end optical receiver is lit up green; when there is no optical signal input, the optical indicator LED of the near-end optical receiver is not lit.

[0037] This utility model also includes an optical splitter. When the number of near-end optical receivers is greater than or equal to 2, the far-end optical transmitter is connected to the optical splitter via optical fiber, and the optical splitter is connected to the near-end optical receivers via optical fiber (the optical splitter is connected to all near-end optical receivers via a corresponding number of optical fiber lines, that is, the number of optical fiber lines connected to the near-end optical receivers on the optical splitter is the same as the number of near-end optical receivers). The far-end optical transmitter converts the radio frequency signal into an optical signal and outputs it to the optical fiber line through the optical output interface, and then outputs it to the optical splitter. The optical splitter then transmits the signal to the optical input interface on all near-end optical receivers via optical fiber.

[0038] This invention can be applied to long-distance transmission of radio frequency signals in frequency bands such as FM, VHF / UHF, 433M, walkie-talkies, 2.4G WiFi, radar, satellite communication, 2G / 3G / 4G LTE, and LoRa, solving the signal attenuation problem caused by excessively long cables in existing technologies.

[0039] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A radio frequency fiber optic transmission system, characterized in that, include: A remote optical transmitter is used to receive radio frequency signals and convert the received radio frequency signals into optical signals. The remote optical transmitter is equipped with a radio frequency signal input port. And at least one near-end optical receiver, which is connected to the far-end optical transmitter via an optical fiber. The near-end optical receiver is used to receive optical signals and convert them into radio frequency signals. The near-end optical receiver is provided with a radio frequency signal output port. The remote optical transmitter includes a first power input unit, a first reverse connection protection unit, a first power indicator unit, a first voltage regulator unit, a power supply unit, a first impedance matching unit, a first optical signal RF signal conversion unit, an optical power automatic control unit, and a first optical indicator unit. The first power input unit is connected to the first reverse connection protection unit. The first reverse connection protection unit is connected to the first power indicator unit and the first voltage regulator unit. The first voltage regulator unit is connected to the power supply unit and the first optical signal RF signal conversion unit. The power supply unit is connected to the RF signal input port. The first impedance matching unit is connected to the RF signal input port and the first optical signal RF signal conversion unit. The first optical signal RF signal conversion unit is connected to the optical power automatic control unit and the first optical indicator unit. The near-end optical receiver includes a second power input unit, a second reverse connection protection unit, a second power indicator unit, a second voltage regulator unit, a second optical signal RF signal conversion unit, a second impedance matching unit, a signal amplification unit, and a second optical indicator unit. The second power input unit is connected to the second reverse connection protection unit. The second reverse connection protection unit is connected to the second power indicator unit and the second voltage regulator unit. The second voltage regulator unit is connected to the second optical signal RF signal conversion unit and the signal amplification unit. The signal amplification unit is connected to the second impedance matching unit and the RF signal output port. The second optical signal RF signal conversion unit is connected to the second impedance matching unit and the second optical indicator unit. The second optical signal RF signal conversion unit is connected to the first optical signal RF signal conversion unit via optical fiber.

2. The radio frequency fiber optic transmission system according to claim 1, characterized in that: It also includes optical splitters. When the number of near-end optical receivers is greater than or equal to 2, the far-end optical transmitter is connected to the optical splitter via an optical fiber line, and the optical splitter is connected to the near-end optical receiver via an optical fiber line.

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