CN111525959A - Radio frequency optical transmission system and method of integrated field amplifier front end - Google Patents
Radio frequency optical transmission system and method of integrated field amplifier front end Download PDFInfo
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- CN111525959A CN111525959A CN202010375341.2A CN202010375341A CN111525959A CN 111525959 A CN111525959 A CN 111525959A CN 202010375341 A CN202010375341 A CN 202010375341A CN 111525959 A CN111525959 A CN 111525959A
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention discloses a radio frequency optical transmission system and a method of an integrated field amplifier front end, which comprises an outdoor transmitting optical transmitter and an indoor receiving optical transmitter, wherein the outdoor transmitting optical transmitter comprises a waveguide interface, a field effect tube amplifier, a field amplifier equalizer, a power amplifier and a laser, the waveguide interface, the field effect tube amplifier, the field amplifier equalizer and the power amplifier are sequentially and electrically connected, and the power amplifier is electrically connected with the laser; the indoor receiving optical terminal machine comprises an optical path self-adaption device, a photoelectric detector and a rear coupling amplifier, wherein the optical path self-adaption device, the photoelectric detector and the rear coupling amplifier are sequentially and electrically connected. In the outdoor transmitting optical transmitter-receiver, the design of the field amplifier is integrated, so that the radio frequency signal directly enters the outdoor optical transmitter-receiver from the antenna to be processed, additional radio frequency signal switching equipment is not needed, and the integration, miniaturization and flexibility of the system are enhanced.
Description
Technical Field
The invention relates to the field of radio frequency communication, in particular to a radio frequency optical transmission system and a radio frequency optical transmission method for an integrated field amplifier front end.
Background
The radio frequency optical transmission system is a transmission system which modulates and loads radio frequency signals to optical carriers, demodulates and recovers the radio frequency signals at a receiving end after the radio frequency signals are transmitted through optical fibers, and is an important component of a radio frequency microwave communication system. In recent years, with the rapid development of wireless communication technology, the application demand of radio frequency optical transmission systems has also increased rapidly. As a technology with very wide applicability, the radio frequency optical transmission system has important application value in civil communication and national defense and military, and the application of the radio frequency optical transmission system covers various fields of radio communication, television broadcasting, radar positioning, remote measurement and control, satellite communication, electronic warfare, cellular mobile communication equipment which completely enters ordinary families at present and the like.
In the prior art, the rf signal generally passes through an additional rf signal switching device and then enters the rf optical transmission system for transmission, which increases signal loss and reduces system stability.
Disclosure of Invention
The invention aims to provide a radio frequency optical transmission system and a radio frequency optical transmission method for an integrated field amplifier front end, and aims to solve the problem that in the prior art, external signal switching equipment is required to increase signal loss and reduce system stability.
In order to achieve the above object, in one aspect, the present invention provides a radio frequency optical transmission system integrated with a field amplifier front end, including an outdoor transmitting optical transceiver and an indoor receiving optical transceiver, where the outdoor transmitting optical transceiver includes a field amplifier component and a laser, the field amplifier component includes a waveguide interface, a field effect transistor amplifier, a field amplifier equalizer and a power amplifier, the waveguide interface, the field effect transistor amplifier, the field amplifier equalizer and the power amplifier are electrically connected in sequence, and the power amplifier is electrically connected to the laser;
the waveguide interface is used for receiving radio frequency signals from an antenna;
the field effect transistor amplifier is used for amplifying the radio frequency signal to form a gain signal;
the field amplifier equalizer adjusts the amplitude-frequency response of the gain signal and optimizes the gain flatness of the field amplifier;
the power amplifier is used for amplifying the power of the gain signal to form a transmission signal;
the laser is used for modulating a transmission radio frequency signal to an optical signal and inputting the optical signal into an optical cable for transmission;
the coupling equalizer is used for adjusting the amplitude-frequency response of the transmission radio frequency signal and optimizing the gain flatness of the link;
the indoor receiving optical terminal comprises an optical path self-adaption device, a photoelectric detector and a rear coupling amplifier, wherein the optical path self-adaption device is electrically connected with the laser, and the optical path self-adaption device is electrically connected with the photoelectric detector and the rear coupling amplifier in sequence;
the optical path self-adaption device is used for self-adaptively controlling the size of the received optical power;
the photoelectric detector is used for demodulating the optical signal into a radio frequency signal;
and the post-coupled amplifier is used for amplifying the electric signal, then outputting the electric signal to the target equipment, and coupling the output signal as a monitoring signal.
The outdoor transmitting optical transceiver further comprises an impedance matcher, wherein the impedance matcher is electrically connected with the power amplifier and the laser, and is used for dynamically matching impedance of the optical cable.
The outdoor transmitting optical transceiver further comprises a coupling equalizer and an input signal monitor, wherein the coupling equalizer is electrically connected with the impedance matcher and the laser, and the input signal monitor is electrically connected with the coupling equalizer;
the coupling equalizer is used for adjusting the amplitude and gain flatness of the radio frequency signal, coupling the transmission signal to the signal monitor and the input signal monitor, and the input signal monitor is used for detecting the state of the transmission signal.
The outdoor transmitting optical transceiver further comprises a control assembly, wherein the control assembly comprises a low-noise controller and a power temperature controller, the power temperature controller is electrically connected with the laser, and the low-noise controller is electrically connected with the field discharge assembly;
the power temperature controller is used for adjusting the temperature and the working current of the laser, and the low-noise controller is used for adjusting the gain of the field amplifier component.
The indoor receiving optical transceiver further comprises a receiving equalizer and an output signal monitor, wherein the receiving equalizer is electrically connected with the post-coupling amplifier, and the output signal monitor is electrically connected with the post-coupling amplifier; the receiving equalizer is used for adjusting the amplitude and gain flatness of the radio frequency signal, and the output signal monitor is used for detecting the state of the demodulated radio frequency signal.
The indoor receiving optical transceiver further comprises a network management component, wherein the network management component comprises a network pipe device, a bias controller and a power detector, the bias controller is electrically connected with the photoelectric detector, the power detector is connected with the optical path self-adapting device, and the network pipe device is electrically connected with the bias controller, the rear coupling amplifier and the optical power detector;
the power detector is used for detecting the optical power of the optical signal;
the bias controller is used for controlling the bias voltage of the photoelectric detector;
the network pipe device is used for detecting the signal packet loss rate, the link optical power and the optical attenuation and configuring communication parameters.
In another aspect, the present invention provides a radio frequency optical transmission method for an integrated field discharge front end, including:
receiving a radio frequency signal from an antenna and amplifying the radio frequency signal to form a gain signal;
adjusting the amplitude-frequency response of the gain signal, and amplifying the power of the gain signal to form a transmission signal;
impedance matching is carried out on the transmission radio frequency signal;
adjusting the amplitude of the radio frequency transmission signal, optimizing the gain flatness, and monitoring the radio frequency signal;
converting the transmission radio frequency signal into an optical signal and transmitting the optical signal through an optical cable;
adjusting the receiving power of the optical signal and converting the optical signal into a radio frequency signal;
and adjusting the amplitude of the radio frequency transmission signal, optimizing the gain flatness, monitoring and amplifying the radio frequency signal, and outputting the radio frequency signal to target equipment.
According to the radio frequency optical transmission system and method integrating the field amplifier front end, the waveguide interface, the field effect transistor amplifier, the field amplifier equalizer and the power amplifier are integrated into the field amplifier assembly, so that radio frequency signals directly enter an outdoor optical transmitter and receiver from an antenna to be processed, additional radio frequency signal switching equipment is not needed, the integration, miniaturization and flexibility of the system are enhanced, and the problem that in the prior art, external signal switching equipment is needed to increase signal loss and reduce the stability of the system is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an rf optical transmission system integrated with a field discharge front end according to the present invention;
fig. 2 is a flow chart of an rf optical transmission method of an integrated field discharge front end according to the present invention.
1-outdoor transmitting optical transceiver, 2-indoor receiving optical transceiver, 11-field amplifier component, 12-laser, 13-impedance matcher, 14-coupled equalizer, 15-input signal monitor, 16-control component, 161-controller, 162-power temperature controller, 111-waveguide interface, 112-field effect transistor amplifier, 113-field amplifier equalizer, 114-power amplifier, 21-optical path self-adapting device, 22-photoelectric detector, 23-rear coupled amplifier, 24-receiving equalizer, 25-output signal monitor, 26-network management component, 261-bias controller, 262-network management device, 263-power detector.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In a first aspect, referring to fig. 1, the present invention provides a rf optical transmission system integrated with a field discharge front end:
the optical fiber cable-based outdoor transmitting optical transceiver comprises an outdoor transmitting optical transceiver 1, an optical cable and an indoor receiving optical transceiver 2, wherein the outdoor transmitting optical transceiver 1 comprises a field amplifier component 11 and a laser 12, the field amplifier component 11 comprises a waveguide interface 111, a field effect tube amplifier 112, a field amplifier equalizer 113 and a power amplifier 114, the waveguide interface 111, the field effect tube amplifier 112, the field amplifier equalizer 113 and the power amplifier 114 are sequentially and electrically connected, and the power amplifier 114 is electrically connected with the laser 12;
the waveguide interface 111 is used for receiving radio frequency signals from an antenna;
the field effect transistor amplifier 112 is configured to amplify a radio frequency signal to form a gain signal;
the field amplifier equalizer 113 is configured to receive the gain signal and adjust the amplitude-frequency response of the gain signal;
the power amplifier 114 is configured to amplify the power of the gain signal to form a transmission signal;
the laser 12 is configured to convert a transmission signal into an optical signal and input the optical signal into the optical cable for transmission;
the indoor receiving optical transceiver 2 comprises an optical path self-adaption device 21, a photoelectric detector 22 and a rear coupling amplifier 23, wherein the optical path self-adaption device 21 is electrically connected with the laser 12, and the optical path self-adaption device 21, the photoelectric detector 22 and the rear coupling amplifier 23 are sequentially electrically connected;
the optical path self-adaption 21 adjusts the receiving power of the optical signal;
the photodetector 22 is used for converting the optical signal into an electrical signal;
the post-coupled amplifier 23 is used for amplifying the electrical signal and then outputting to the target device, and coupling a small part of the signal to the signal monitor.
In this embodiment, the waveguide interface 111 receives a radio frequency signal from an antenna, and compared with a common radio frequency interface, the waveguide interface has small conductor loss and medium loss, large power capacity, and no radiation loss; the field effect transistor amplifier 112 adopts a low noise amplifier, the noise temperature of the low noise amplifier determines the noise temperature of the field effect transistor assembly 11, and the field effect transistor amplifier with relatively low noise temperature can effectively reduce the noise temperature of the field effect transistor assembly 11; the field amplifier equalizer 113 mainly adjusts the amplitude-frequency response of the field effect transistor amplifier 112 to make the flatness of the output amplitude-frequency response meet the requirement; the power amplifier 114 is configured to amplify the power of the gain signal, so that the gain of the fet amplifier 112 meets the power condition required for transmission; the laser 12 is configured to convert a transmission signal into an optical signal and input the optical signal into the optical cable for transmission; the optical path self-adaption device 21 can automatically attenuate optical power when the optical power of the input optical receiver is too large, so that the power reaching the photoelectric detector is below the saturation threshold optical power, and the photoelectric detector is prevented from working in a nonlinear state; if the optical power reaching the optical receiver is smaller than the saturation threshold value optical power, the optical power is not attenuated by the optical path self-adaption; the photodetector 22 is used for converting the optical signal into an electrical signal; the post-coupled amplifier 23 is configured to amplify the weak radio frequency signal output by the optical/electrical converter, so that the weak radio frequency signal meets the output condition. By integrating the waveguide interface 111, the fet amplifier 112, the fet equalizer 113, and the power amplifier 114 into the field amplifier module 11, the rf signal directly enters the outdoor optical transceiver from the antenna for processing, and no additional rf signal switching device is needed, thereby solving the problem that the prior art needs an external signal switching device to increase signal loss and reduce system stability.
Further, the outdoor transmitting optical transceiver 1 further includes an impedance matcher 13, where the impedance matcher 13 is electrically connected to the power amplifier and the laser 12, and the impedance matcher 13 is configured to perform impedance dynamic matching on the optical cable.
In the present embodiment, high-frequency signal reflection can be reduced or eliminated by impedance matching, thereby improving signal quality.
Further, the outdoor transmitting optical transceiver 1 further includes a coupling equalizer 14 and an input signal monitor 15, the coupling equalizer 14 is electrically connected to the impedance matcher 13 and the laser 12, and the input signal monitor 15 is electrically connected to the coupling equalizer 14;
the coupled equalizer 14 is used for adjusting the amplitude and gain flatness of the rf signal and coupling a small portion of the signal to the signal monitor 15, and the input signal monitor 15 is used for monitoring the state of the transmission signal.
In the present embodiment, the input signal monitor 15 detects the input signal, so as to determine whether the signal is normal, and accordingly, whether the field discharge assembly 11 has a fault can be determined.
Further, the outdoor transmitting optical transceiver 1 further includes a control component 16, the control component 16 includes a low noise controller 161 and a power temperature controller 162, the power temperature controller 162 is electrically connected to the laser 12, the power temperature controller 162 is configured to adjust the temperature and the operating current of the laser 12, and the low noise controller 161 is configured to adjust the gain of the field discharge component 11.
In this embodiment, the temperature and the output power of the laser 12 are kept constant, so that the power temperature controller 162 and the temperature controller monitor and control the operating temperature and the optical power of the laser converter 12, and ensure that the laser 12 operates at a stable output optical power and temperature.
Further, the indoor receiving optical transceiver 2 further includes a receiving equalizer 24 and an output signal monitor 25, the receiving equalizer 24 is electrically connected to the post-coupled amplifier 23, and the output signal monitor 25 is electrically connected to the receiving equalizer 24.
The receiving equalizer 24 is configured to adjust the electrical signal and output the demodulated electrical signal to the output signal monitor 25, and the output signal monitor 25 is configured to detect a state of the demodulated radio frequency signal.
In the present embodiment, the receiving equalizer 24 adjusts and compensates the electric signal to optimize the gain flatness; the output signal monitor 25 detects the state of the electrical signal, so that the quality of the electrical signal can be judged, and whether the previous circuit has a fault or not can be detected.
Further, the indoor receiving optical transceiver 2 further includes a network management component 26, the network management component 26 includes a network pipe device 262 and a bias controller 261, the bias controller 261 is electrically connected with the photodetector 22, the network pipe device 262 is electrically connected with the bias controller 261 and the post-coupled amplifier 23, and the power detector 263 is configured to detect the optical power of the optical signal;
the bias controller 261 is configured to detect the optical power of the electrical signal before demodulation based on a bias control voltage;
the network pipe device 262 is configured to detect a packet loss rate of a signal and adjust a gain of the post-coupled amplifier 23.
In this embodiment, the bias controller 261 and the power monitor 263 are controlled by the network controller 262 to detect the optical power, bias the photodetector 22, and then adjust the gain of the post-coupled amplifier 23 to improve the signal quality.
In a second aspect, referring to fig. 2, the present invention provides a radio frequency optical transmission method for integrated field discharge front end, including:
s101, receiving a radio frequency signal from an antenna, amplifying the radio frequency signal and forming a gain signal;
the rf signal has a weak power, which is not suitable for signal processing in the later stage, and therefore needs to be amplified to obtain a gain signal.
S102, adjusting the amplitude-frequency response of the gain signal, amplifying the power of the gain signal and forming a transmission signal;
and adjusting the amplitude-frequency response of the gain signal to ensure that the flatness of the output amplitude-frequency response meets the requirement, thereby increasing the signal quality, and further amplifying the gain signal to ensure that the gain signal meets the power requirement of propagation in the optical cable.
S103, impedance matching is carried out on the transmission signals;
through impedance matching, high-frequency signal reflection can be reduced and eliminated, and therefore signal quality is improved.
S104, amplitude adjustment is carried out on the radio frequency transmission signal, gain flatness is optimized, and the radio frequency signal is monitored
The input signal is detected, so that whether the signal is normal or not can be judged, and whether a signal system has a fault or not can be judged accordingly.
S105, converting the transmission signal into an optical signal and transmitting the optical signal through an optical cable;
by converting the signal of the electrical property of the transmission signal into an optical signal, the transmission can then take place in an optical cable.
S106, adjusting the receiving power of the optical signal and converting the optical signal into an electric signal;
when the optical power is too large, the optical power is automatically attenuated, so that the power reaching the photoelectric detector is below the saturation threshold optical power, the photoelectric detector is prevented from working in a nonlinear state to influence signal receiving, and then the optical signal is converted into an electric signal to be processed in a circuit conveniently.
S107, amplitude adjustment is carried out on the radio frequency transmission signal, gain flatness is optimized, and the radio frequency signal is monitored;
adjusting and compensating the electric signals to optimize gain flatness; the frequency of the electric signal is detected, so that the quality of the electric signal can be judged, and whether the front circuit has a fault or not is detected.
S108 amplifies the electric signal and then outputs to the target device.
The electrical signal is amplified to meet the transmission requirements and then output to the target device.
Through receiving, amplifying and equalizing the antenna signal and integrating the antenna signal into one assembly, the radio frequency signal can be directly processed after entering from the antenna without additional equipment, so that the integration, miniaturization and flexibility of the system are enhanced, and the problem that the stability of the system is reduced due to the fact that the signal loss is increased by external signal switching equipment in the prior art is solved.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A radio frequency optical transmission system of an integrated field amplifier front end is characterized in that,
the outdoor transmitting optical transceiver comprises a field amplifier component and a laser, wherein the field amplifier component comprises a waveguide interface, a field effect tube amplifier, a field amplifier equalizer and a power amplifier, the waveguide interface, the field effect tube amplifier, the field amplifier equalizer and the power amplifier are sequentially and electrically connected, and the power amplifier is electrically connected with the laser;
the waveguide interface is used for receiving radio frequency signals from an antenna;
the field effect transistor amplifier is used for amplifying the radio frequency signal to form a gain signal;
the field amplifier equalizer adjusts the amplitude-frequency response of the gain signal and optimizes the gain flatness of the field amplifier;
the power amplifier is used for amplifying the power of the gain signal to form a transmission signal;
the laser is used for modulating a transmission radio frequency signal to an optical signal and inputting the optical signal into an optical cable for transmission;
the coupling equalizer is used for adjusting the amplitude-frequency response of the transmission radio frequency signal and optimizing the gain flatness of the link;
the indoor receiving optical terminal comprises an optical path self-adaption device, a photoelectric detector and a rear coupling amplifier, wherein the optical path self-adaption device is electrically connected with the laser, and the optical path self-adaption device is electrically connected with the photoelectric detector and the rear coupling amplifier in sequence;
the optical path self-adaption device is used for self-adaptively controlling the size of the received optical power;
the photoelectric detector is used for demodulating the optical signal into a radio frequency signal;
and the post-coupled amplifier is used for amplifying the electric signal, then outputting the electric signal to the target equipment, and coupling the output signal as a monitoring signal.
2. The RF optical transmission system of claim 1,
the outdoor transmitting optical transceiver further comprises an impedance matcher, wherein the impedance matcher is electrically connected with the power amplifier and the laser, and is used for dynamically matching the impedance of the optical cable.
3. The RF optical transmission system of claim 2,
the outdoor transmitting optical transceiver also comprises a coupling equalizer and an input signal monitor, wherein the coupling equalizer is electrically connected with the impedance matcher and the laser, and the input signal monitor is electrically connected with the coupling equalizer;
the coupling equalizer is used for adjusting the amplitude and gain flatness of the radio frequency signal, coupling the transmission signal to the signal monitor and the input signal monitor, and the input signal monitor is used for detecting the state of the transmission signal.
4. The RF optical transmission system of claim 3,
the outdoor transmitting optical terminal further comprises a control assembly, wherein the control assembly comprises a low-noise controller and a power temperature controller, the power temperature controller is electrically connected with the laser, and the low-noise controller is electrically connected with the field discharge assembly;
the power temperature controller is used for adjusting the temperature and the working current of the laser, and the low-noise controller is used for adjusting the gain of the field amplifier component.
5. The RF optical transmission system of claim 1,
the indoor receiving optical transmitter and receiver further comprises a receiving equalizer and an output signal monitor, wherein the receiving equalizer is electrically connected with the rear coupling amplifier, and the output signal monitor is electrically connected with the rear coupling amplifier; the receiving equalizer is used for adjusting the amplitude and gain flatness of the radio frequency signal, and the output signal monitor is used for detecting the state of the demodulated radio frequency signal.
6. The RF optical transmission system of claim 5, wherein the RF optical transmission system further comprises a receiver,
the indoor receiving optical transceiver further comprises a network management component, wherein the network management component comprises a network pipe device, a bias controller and a power detector, the bias controller is electrically connected with the photoelectric detector, the power detector is connected with the optical path self-adapting device, and the network pipe device is electrically connected with the bias controller, the rear coupling amplifier and the optical power detector;
the power detector is used for detecting the optical power of the optical signal;
the bias controller is used for controlling the bias voltage of the photoelectric detector;
the network pipe device is used for detecting the signal packet loss rate, the link optical power and the optical attenuation and configuring communication parameters.
7. A radio frequency optical transmission method of an integrated field amplifier front end is characterized by comprising the following steps:
receiving a radio frequency signal from an antenna and amplifying the radio frequency signal to form a gain signal;
adjusting the amplitude-frequency response of the gain signal, and amplifying the power of the gain signal to form a transmission signal;
impedance matching is carried out on the transmission radio frequency signal;
adjusting the amplitude of the radio frequency transmission signal, optimizing the gain flatness, and monitoring the radio frequency signal;
converting the transmission radio frequency signal into an optical signal and transmitting the optical signal through an optical cable;
adjusting the receiving power of the optical signal and converting the optical signal into a radio frequency signal;
adjusting the amplitude of the radio frequency transmission signal, optimizing the gain flatness, and monitoring the radio frequency signal;
the radio frequency signal is amplified and then output to the target device.
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| CN202010375341.2A CN111525959B (en) | 2020-05-07 | 2020-05-07 | Radio frequency optical transmission system and method integrating field emission front end |
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| CN202010375341.2A CN111525959B (en) | 2020-05-07 | 2020-05-07 | Radio frequency optical transmission system and method integrating field emission front end |
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