CN111525959B - Radio frequency optical transmission system and method integrating field emission front end - Google Patents
Radio frequency optical transmission system and method integrating field emission front end Download PDFInfo
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- CN111525959B CN111525959B CN202010375341.2A CN202010375341A CN111525959B CN 111525959 B CN111525959 B CN 111525959B CN 202010375341 A CN202010375341 A CN 202010375341A CN 111525959 B CN111525959 B CN 111525959B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 43
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- 230000005669 field effect Effects 0.000 claims abstract description 12
- 230000008878 coupling Effects 0.000 claims description 19
- 230000004044 response Effects 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- 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
- H04B—TRANSMISSION
- 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
- H04B10/60—Receivers
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Abstract
The invention discloses a radio frequency optical transmission system and a method for integrating a field emission front end, wherein the radio frequency optical transmission system comprises an outdoor emission optical terminal machine and an indoor receiving optical terminal machine, the outdoor emission optical terminal machine comprises a waveguide interface, a field effect transistor amplifier, a field emission equalizer, a power amplifier and a laser, the waveguide interface, the field effect transistor amplifier, the field emission equalizer and the power amplifier are electrically connected in sequence, and the power amplifier is electrically connected with the laser; the indoor receiving optical transceiver comprises an optical path self-adaption device, a photoelectric detector and a post-coupling amplifier, wherein the optical path self-adaption device, the photoelectric detector and the post-coupling amplifier are electrically connected in sequence. In the outdoor transmitting optical transceiver, the design of the integrated field emission ensures that the radio frequency signals directly enter the outdoor optical transceiver from the antenna for processing without additional radio frequency signal switching equipment, thereby enhancing the integration, miniaturization and flexibility of the system.
Description
Technical Field
The invention relates to the field of radio frequency communication, in particular to a radio frequency optical transmission system and a method for integrating a field emission front end.
Background
The radio frequency optical transmission system is a transmission system which modulates and loads radio frequency signals to an optical carrier wave, demodulates and recovers the radio frequency signals at a receiving end after the radio frequency signals are transmitted through an optical fiber, 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 requirements of radio frequency optical transmission systems are also rapidly increasing. 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 its application covers various fields such as radio communication, television broadcasting, radar positioning, telemetry and remote control, satellite communication, electronic warfare and cellular mobile communication equipment which has completely entered into ordinary families at present.
In the prior art, the radio frequency signal generally passes through an additional radio frequency signal switching device and then enters the radio frequency optical transmission system for transmission, so that the signal loss is increased and the stability of the system is reduced.
Disclosure of Invention
The invention aims to provide a radio frequency optical transmission system and a method for an integrated field emission front end, which aim to solve the problem that in the prior art, external signal switching equipment is required to be connected, so that signal loss is increased, and system stability is reduced.
In order to achieve the above objective, in one aspect, the present invention provides a radio frequency optical transmission system integrated with a field emission front end, including an outdoor emission optical transceiver and an indoor receiving optical transceiver, where the outdoor emission optical transceiver includes a field emission component and a laser, the field emission component includes a waveguide interface, a field effect transistor amplifier, a field emission equalizer, and a power amplifier, the waveguide interface, the field effect transistor amplifier, the field emission equalizer, and the power amplifier are electrically connected in sequence, 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 flatness of the field amplifier gain;
The power amplifier is used for amplifying the gain signal power to form a transmission signal;
The laser is used for modulating a transmission radio frequency signal onto 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 signals and optimizing the link gain flatness;
the indoor receiving optical transceiver comprises an optical path self-adaption device, a photoelectric detector and a post-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 post-coupling amplifier in sequence;
The light path self-adaptive device is used for self-adaptively controlling the magnitude of the received light power;
The photoelectric detector is used for demodulating the optical signal into a radio frequency signal;
The post-coupling amplifier is used for amplifying the electric signal, 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 the impedance matcher is used for dynamically matching the 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 the gain flatness of the radio frequency signal and coupling the transmission signal to the input signal monitor of the 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 emission 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 emission 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 the gain flatness of the radio frequency signals, and the output signal monitor is used for detecting the state of the demodulated radio frequency signals.
The indoor receiving optical transceiver further comprises a network management assembly, wherein the network management assembly comprises a network manager, 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-adaptive device, and the network manager is electrically connected with the bias controller, the post-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 manager is used for detecting the signal packet loss rate, the link optical power and the optical attenuation and configuring the communication parameters.
In another aspect, the present invention provides a method for transmitting radio frequency light in an integrated field emission 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, amplifying the gain signal power, and forming a transmission signal;
impedance matching is carried out on the transmission radio frequency signals;
amplitude adjustment is carried out on the radio frequency transmission signal, gain flatness is optimized, and the radio frequency signal is monitored;
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 the radio frequency optical transmission method integrated with the field emission front end, the waveguide interface, the field effect transistor amplifier, the field emission equalizer and the power amplifier are integrated into the field emission component, so that radio frequency signals directly enter an outdoor optical transceiver for processing through an antenna, additional radio frequency signal switching equipment is not needed, the integration, miniaturization and flexibility of the system are enhanced, and the problem that signal loss is increased and system stability is reduced due to the fact that external signal switching equipment is needed in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an integrated front-end RF optical transmission system according to the present invention;
Fig. 2 is a schematic flow chart of a method for transmitting rf light in an integrated field front end according to the present invention.
The system comprises a 1-outdoor transmitting optical transceiver, a 2-indoor receiving optical transceiver, a 11-field amplifying component, a 12-laser, a 13-impedance matcher, a 14-coupling equalizer, a 15-input signal monitor, a 16-control component, a 161-controller, a 162-power temperature controller, a 111-waveguide interface, a 112-field effect transistor amplifier, a 113-field amplifying equalizer, a 114-power amplifier, a 21-optical path adaptive device, a 22-photoelectric detector, a 23-post-coupling amplifier, a 24-receiving equalizer, a 25-output signal monitor, a 26-network management component, a 261-bias controller, a 262-network management device and a 263-power detector.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In a first aspect, referring to fig. 1, the present invention provides a radio frequency optical transmission system integrated with a front end of a field emission device:
The outdoor transmitting optical transceiver 1 comprises a field amplifying assembly 11 and a laser 12, wherein the field amplifying assembly 11 comprises a waveguide interface 111, a field effect transistor amplifier 112, a field amplifying equalizer 113 and a power amplifier 114, the waveguide interface 111, the field effect transistor amplifier 112, the field amplifying equalizer 113 and the power amplifier 114 are electrically connected in sequence, and the power amplifier 114 is electrically connected with the laser 12;
the waveguide interface 111 is configured to receive a radio frequency signal from an antenna;
the field effect transistor amplifier 112 is configured to amplify a radio frequency signal to form a gain signal;
The field equalizer 113 is configured to receive the gain signal and adjust an amplitude-frequency response of the gain signal;
The power amplifier 114 is configured to amplify the gain signal power 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 post-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 post-coupling amplifier 23 are electrically connected in sequence;
The optical path adaptive device 21 adjusts the received power of the optical signal;
the photodetector 22 is configured to convert the optical signal into an electrical signal;
the post-coupling amplifier 23 is used for amplifying the electric signal and then outputting the electric signal to the target device, and coupling a small part of the electric signal to the signal monitor.
In this embodiment, the waveguide interface 111 receives the radio frequency signal from the antenna, and compared with the common radio frequency interface, the waveguide interface has small conductor loss and dielectric loss, large power capacity and no radiation loss; the fet amplifier 112 employs a low noise amplifier, the noise temperature of which determines the noise temperature of the fet assembly 11, and the fet amplifier with relatively low noise temperature can effectively reduce the noise temperature of the fet assembly 11; the field-effect-tube equalizer 113 mainly adjusts the amplitude-frequency response of the field-effect-tube amplifier 112 to make the flatness of the output amplitude-frequency response meet the requirements; the power amplifier 114 is configured to amplify the gain signal power so that the gain of the fet amplifier 112 satisfies 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-adaptive device 21 can automatically attenuate the optical power when the optical power of the input optical receiver is overlarge, 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; and if the optical power reaching the optical receiver is smaller than the saturation threshold optical power, the optical path self-adaptation does not attenuate the optical power; the photodetector 22 is configured to convert the optical signal into an electrical signal; the post-coupling amplifier 23 is configured to amplify the weak radio frequency signal output by the optical/electrical converter so as to satisfy the output condition. By integrating the waveguide interface 111, the fet amplifier 112, the fet equalizer 113 and the power amplifier 114 into the fet assembly 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 external signal switching device is needed in the prior art, which increases the signal loss and reduces the stability of the system.
Further, the outdoor transmitting optical transceiver 1 further includes an impedance matcher 13, where the impedance matcher 13 is electrically connected with the power amplifier and the laser 12, and the impedance matcher 13 is used for dynamically matching the impedance of the optical cable.
In the embodiment, high-frequency signal reflection can be reduced and eliminated through impedance matching, so that the signal quality is improved.
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 coupling equalizer 14 is used for adjusting the amplitude and gain flatness of the radio frequency signal and coupling a small part 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 this embodiment, the input signal monitor 15 detects the input signal, so as to determine whether the signal is normal, and accordingly determine whether the field emission device 11 has a fault.
Further, the outdoor transmitting optical transceiver 1 further includes a control unit 16, where the control unit 16 includes a low noise controller 161 and a power temperature controller 162, where the power temperature controller 162 is electrically connected to the laser 12, the power temperature controller 162 is used to adjust the temperature and the working current of the laser 12, and the low noise controller 161 is used to adjust the gain of the field emission unit 11.
In this embodiment, the temperature and output power of the laser 12 are kept constant, so that the power temperature controller 162 and the temperature controller monitor and control the working temperature and optical power of the laser converter 12, so as to ensure that the laser 12 works 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, where the receiving equalizer 24 is electrically connected to the post-coupling 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 this embodiment, the receiving equalizer 24 performs adjustment compensation on the electric signal to optimize gain flatness; the output signal monitor 25 detects the state of the electric signal, so that the quality of the electric 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, where the network management component 26 includes a network manager 262 and a bias controller 261, the bias controller 261 is electrically connected to the photodetector 22, the network manager 262 is electrically connected to the bias controller 261 and the post-coupling amplifier 23, and the power detector 263 is configured to detect optical power of an optical signal;
the bias controller 261 is configured to detect optical power of the electrical signal before demodulation based on a bias control voltage;
the network manager 262 is configured to detect a packet loss rate of a signal and adjust a gain of the post-coupling amplifier 23.
In this embodiment, the offset controller 261 and the power monitor 263 are controlled by the webmaster 262 to detect optical power, and the photodetector 22 is offset controlled, and then the gain of the post-coupling amplifier 23 is adjusted to improve signal quality.
In a second aspect, referring to fig. 2, the present invention provides a method for transmitting radio frequency light of an integrated field front end, including:
s101, receiving radio frequency signals from an antenna, and amplifying the radio frequency signals to form gain signals;
The power of the radio frequency signal is weak and is not suitable for later signal processing, so that the radio frequency signal is amplified into a gain signal.
S102, adjusting amplitude-frequency response of a gain signal, amplifying gain signal power and forming a transmission signal;
the amplitude-frequency response of the gain signal is adjusted to enable the flatness of the output amplitude-frequency response to meet the requirements, so that the signal quality is improved, and then the gain signal is further amplified to enable the gain signal to meet the power requirements of propagation in the optical cable.
S103, carrying out impedance matching on the transmission signal;
By impedance matching, high-frequency signal reflection can be reduced and eliminated, thereby improving signal quality.
S104, amplitude adjustment is carried out on the radio frequency transmission signal, gain flatness is optimized, and monitoring is carried out on the radio frequency signal
The input signal is detected, so that whether the signal is normal or not can be judged, and whether the signal system fails or not can be judged according to the signal.
S105, converting the transmission signal into an optical signal and transmitting the optical signal through an optical cable;
the transmission can then take place in the cable by converting the signal of the electrical nature of the transmission signal into an optical signal.
S106, adjusting the receiving power of the optical signal and converting the optical signal into an electric signal;
when the optical power is too high, 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 reception, and then the optical signal is converted into an electric signal so as to be convenient to process in a circuit.
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 signal, and optimizing the gain flatness; the frequency of the electric signal is detected, so that the quality of the electric signal can be judged, and whether the circuit in the front is faulty 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 integrating antenna signal reception, amplification and equalization into a component, radio frequency signals can be directly processed after entering by an antenna without additional equipment, thereby enhancing the integration, miniaturization and flexibility of a system, and solving the problem that the prior art needs external signal switching equipment to increase signal loss and reduce the stability of the system.
The above disclosure is only a preferred embodiment of the present invention, and it should be understood that the scope of the invention is not limited thereto, and those skilled in the art will appreciate that all or part of the procedures described above can be performed according to the equivalent changes of the claims, and still fall within the scope of the present invention.
Claims (4)
1. A radio frequency optical transmission system integrated with a field emission front end is characterized in that,
The outdoor transmitting optical transceiver comprises a field amplifying assembly and a laser, wherein the field amplifying assembly comprises a waveguide interface, a field effect transistor amplifier, a field amplifying equalizer and a power amplifier, the waveguide interface, the field effect transistor amplifier, the field amplifying equalizer and the power amplifier are electrically connected in sequence, 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 flatness of the field amplifier gain;
The power amplifier is used for amplifying the gain signal power to form a transmission signal;
The laser is used for modulating a transmission radio frequency signal onto an optical signal and inputting the optical signal into an optical cable for transmission;
The indoor receiving optical transceiver comprises an optical path self-adaption device, a photoelectric detector and a post-coupling amplifier, wherein the optical path self-adaption device is electrically connected with the laser, and the optical path self-adaption device, the photoelectric detector and the post-coupling amplifier are electrically connected in sequence;
The light path self-adaptive device is used for self-adaptively controlling the magnitude of the received light power;
The photoelectric detector is used for demodulating the optical signal into a radio frequency signal;
The post-coupling amplifier is used for amplifying the electric signal, outputting the electric signal to target equipment and coupling the output signal as a monitoring signal;
The outdoor transmitting optical transceiver further comprises an impedance matcher, a coupling equalizer and an input signal monitor, wherein the impedance matcher is electrically connected with the power amplifier and the laser, and the impedance matcher is used for dynamically matching the impedance of the optical cable; 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 the gain flatness of the radio frequency signals and coupling the transmission signals to the input signal monitor, and the input signal monitor is used for detecting the states of the transmission signals;
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 the gain flatness of the radio frequency signals, and the output signal monitor is used for detecting the state of the demodulated radio frequency signals.
2. An integrated front-end rf optical transmission system as recited in claim 1, wherein,
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 emission 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 emission component.
3. An integrated front-end rf optical transmission system as recited in claim 1, wherein,
The indoor receiving optical transceiver further comprises a network management assembly, wherein the network management assembly comprises a network manager, 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-adaptive device, and the network manager is electrically connected with the bias controller, the post-coupling amplifier and the 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 manager is used for detecting the signal packet loss rate, the link optical power and the optical attenuation and configuring the communication parameters.
4. A radio frequency optical transmission method of an integrated field emission front end, which is applicable to the radio frequency optical transmission system of the integrated field emission front end as claimed in claim 1, and is characterized by comprising:
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, amplifying the gain signal power, and forming a transmission signal;
impedance matching is carried out on the transmission radio frequency signals;
amplitude adjustment is carried out on the radio frequency transmission signal, gain flatness is optimized, and the radio frequency signal is monitored;
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;
amplitude adjustment is carried out on the radio frequency transmission signal, gain flatness is optimized, and the radio frequency signal is monitored;
the radio frequency signal is amplified and then output to the target device.
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