CN112671470A - Fiber-stabilized radio frequency transmission system and method - Google Patents
Fiber-stabilized radio frequency transmission system and method Download PDFInfo
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Abstract
One or more embodiments of the present disclosure provide an optical fiber stable radio frequency transmission system and method, which modulate a target radio frequency signal of a reference atomic frequency source onto an optical signal in a phase modulation manner based on phase modulation and dispersion transition intensity demodulation, and transmit the optical signal to a remote device through an optical fiber link. The signal is demodulated at the remote device by converting the dispersion introduced by the fiber optic link into an electrical signal strength. The demodulated signal is modulated again and then transmitted back to the local end equipment, after the demodulation and the frequency division are carried out on the local end equipment, the local end equipment and another reference radio frequency signal of the local end equipment are subjected to up-conversion to the frequency of a target radio frequency signal, the conjugation of phase noise introduced by an optical fiber link is realized, the phase noise conjugate signal is transmitted to the remote end equipment through the optical fiber link again, and a user of the remote end equipment can obtain a stable radio frequency signal.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of signal transmission technologies, and in particular, to an apparatus and a method for stable radio frequency signal transmission through an optical fiber.
Background
The atomic frequency source can generate a standard frequency signal, and the measurement accuracy of the standard frequency signal is higher than that of other physical quantities by more than 4 orders of magnitude. High-precision frequency sources are needed in the fields benefiting from precise time-frequency application, including basic physical constant measurement, navigation positioning systems, deep space exploration, long-distance distributed radio telescope arrays, national defense, industrial production, other important national economic fields and the like. However, high performance atomic frequency sources are costly and environmentally demanding. Therefore, a highly stable frequency transmission system is important, and the system stably transmits signals emitted by a high-performance atomic frequency source from a local device to a remote device for a user to use, so that the requirement of the user on the atomic frequency source signals is met.
In recent years, optical fiber is a preferred medium to stably transmit atomic frequency source signals due to its advantages of low loss, high interference resistance, and low cost. Electro-optical modulation is an indispensable process for a frequency transfer system based on an optical fiber, and the traditional modulation mode is intensity modulation. The intensity modulator has large attenuation, unstable working point and direct current drift, so that additional direct current bias control needs to be added, and the complexity of the system is increased. On the other hand, since the signal inevitably introduces phase noise during its transmission through the optical fiber, it needs to be compensated for. The compensation system with feedback has complex structure, low robustness and higher system cost.
Based on this, a solution for compensating the phase noise of the optical fiber link by a frequency transfer system capable of solving the dc drift problem and having no feedback is needed.
Disclosure of Invention
In view of the above, it is an object of one or more embodiments of the present disclosure to provide an apparatus and method for fiber-stabilized rf transmission.
In view of the above, one or more embodiments of the present specification provide an optical fiber stabilized radio frequency transmission system, including:
a local end device and a remote end device connected by an optical fiber link,
the local end equipment phase-modulates a target radio frequency signal of a reference atomic frequency source onto a first optical signal to form a first modulated optical signal, and transmits the first modulated optical signal to the remote end equipment through the optical fiber link;
the remote equipment directly demodulates the received first modulated optical signal to obtain a demodulated optical signal by converting chromatic dispersion introduced by the optical fiber link transmission into intensity, performs phase modulation on the demodulated optical signal to form a second modulated optical signal, and transmits the second modulated optical signal back to the local equipment through the optical fiber link;
the local end equipment demodulates and divides the second modulated optical signal by two, and then up-converts the second modulated optical signal and an auxiliary radio frequency signal which refers to the atomic frequency source to the frequency of the target radio frequency signal to obtain a phase noise conjugate signal, and transmits the phase noise conjugate signal to the remote end equipment through the optical fiber link after phase modulation;
and the remote equipment demodulates the phase noise conjugate signal after phase modulation to obtain a third radio frequency signal.
Based on the same inventive concept, one or more embodiments of the present specification further provide an optical fiber stable radio frequency transmission method, including:
the local end equipment phase-modulates a target radio frequency signal of a reference atomic frequency source onto a first optical signal to form a first modulated optical signal, and transmits the first modulated optical signal to remote end equipment through an optical fiber link;
the remote equipment directly demodulates the received first modulated optical signal to obtain a demodulated optical signal by converting chromatic dispersion introduced by the optical fiber link transmission into intensity, performs phase modulation on the demodulated optical signal to form a second modulated optical signal, and transmits the second modulated optical signal back to the local equipment through the optical fiber link;
the local end equipment demodulates and divides the second modulated optical signal by two, and then up-converts the second modulated optical signal and an auxiliary radio frequency signal which refers to the atomic frequency source to the frequency of the target radio frequency signal to obtain a phase noise conjugate signal, and transmits the phase noise conjugate signal to the remote end equipment through the optical fiber link after phase modulation;
and the remote equipment demodulates the phase noise conjugate signal after phase modulation to obtain a third radio frequency signal.
As can be seen from the foregoing, in the apparatus and method for stable radio frequency transmission over optical fiber according to one or more embodiments of the present disclosure, based on phase modulation and dispersion-to-strength demodulation, a local device modulates a target radio frequency signal of a reference atomic frequency source onto an optical signal in a phase modulation manner, and transmits the optical signal to a remote device through an optical fiber link. The signal can be directly demodulated at the remote device by converting the dispersion introduced by the fiber link into strength. The demodulated signal is transmitted back to the local end equipment, after frequency division by two, the demodulated signal and another reference radio frequency signal of the local end equipment are up-converted to a target radio frequency signal frequency to realize conjugation of phase noise introduced by the optical fiber link, the phase noise conjugate signal is transmitted to the remote end equipment through the optical fiber link again, and the remote end equipment can obtain a stable radio frequency signal. Thereby realizing the technical effect of compensating the phase noise introduced by the optical fiber link.
Drawings
In order to more clearly illustrate one or more embodiments or prior art solutions of the present specification, the drawings that are needed in the description of the embodiments or prior art will be briefly described below, and it is obvious that the drawings in the following description are only one or more embodiments of the present specification, and that other drawings may be obtained by those skilled in the art without inventive effort from these drawings.
Fig. 1 is a schematic structural diagram of an optical fiber stabilized radio frequency transmission system according to one or more embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a local device structure according to one or more embodiments of the present disclosure;
FIG. 3 is a schematic diagram of a remote device in accordance with one or more embodiments of the present disclosure;
fig. 4 is a flow diagram of a method for stable rf transmission over fiber according to one or more embodiments of the present disclosure.
In the figure: 1-local end equipment, 11-atomic frequency source, 12-electric coupler, 13-auxiliary radio frequency signal source, 14-mixer, 15-first electric filter, 16-frequency halver, 17-second electric filter, 18-first photodetector, 19-electric amplifier, 110-third electric filter, 111-first laser, 112-first phase modulator, 113-target radio frequency signal source, 114-second laser, 115-second phase modulator, 116-first dense wavelength division multiplexer; 2-remote device, 24-second photodetector, 23-fourth electrical filter, 21-third phase modulator, 22-third laser, 26-third photodetector, 27-fifth electrical filter, 28-user, 25-second dense wavelength division multiplexer; 3-fiber link.
Detailed Description
For the purpose of promoting a better understanding of the objects, aspects and advantages of the present disclosure, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
It is to be noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present specification should have the ordinary meaning as understood by those of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in one or more embodiments of the specification is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
As shown in fig. 1, one or more embodiments of the present disclosure provide an optical fiber stabilized radio frequency transmission device, including:
the local end equipment 1 and the remote end equipment 2 are connected through the optical fiber link 3.
As shown in fig. 2, which is a schematic connection diagram of a local end device 1 according to one or more embodiments of the present specification, the local end device 1 includes:
an atomic frequency source 11, an electrical coupler 12, an auxiliary radio frequency signal source 13, a mixer 14, a first electrical filter 15, a frequency halver 16, a second electrical filter 17, a first photodetector 18, an electrical amplifier 19, a third electrical filter 110, a first laser 111, a first phase modulator 112, a target radio frequency signal source 113, a second laser 114, a second phase modulator 115, a first dense wavelength division multiplexer 116.
Wherein, the output end of the atomic frequency source 11 is connected with the input end of the electric coupler 12, the first output end of the electric coupler 12 is connected with the input end of the target radio frequency signal source 113, the second output end of the electric coupler 12 is connected with the input end of the auxiliary radio frequency signal source 13, the output end of the target signal source 113 is connected with the electric input end of the second phase modulator 115, the output end of the second laser 114 is connected with the optical input end of the second phase modulator 115, the optical output end of the second phase modulator 115 is connected with the input end of the C1 channel of the first dense wavelength division multiplexer 116, the optical interface of the first dense wavelength division multiplexer 116 is connected with the optical fiber link 3, the output end of the C2 channel of the first dense wavelength division multiplexer 116 is connected with the optical input end of the first photoelectric detector 18, the electric output end of the first photoelectric detector 18 is connected with the input end of the second electric filter 17, the output end of, the output end of the first electrical filter 15 is connected to the first input end of the mixer 14, the second input end of the mixer 14 is connected to the output end of the auxiliary rf signal source 13, the output end of the mixer 14 is connected to the input end of the electrical amplifier 19, the output end of the electrical amplifier 19 is connected to the input end of the third electrical filter 110, the output end of the third electrical filter 110 is connected to the electrical input end of the first phase modulator 112, the output end of the first laser 111 is connected to the optical input end of the first phase modulator 112, and the optical output end of the first phase modulator 112 is connected to the input end of the C3 channel of the first dense wavelength division multiplexer 116.
Optionally, the signal frequency of the atomic frequency source 11 is preferably 10MHz, and may also be a preset frequency meeting experimental requirements.
As shown in fig. 3, which is a schematic diagram illustrating a connection of a remote device 2 according to one or more embodiments of the present disclosure, the remote device 2 includes:
a second photodetector 24, a fourth electrical filter 23, a third phase modulator 21, a third laser 22, a third photodetector 26, a fifth electrical filter 27, a subscriber 28, a second dense wavelength division multiplexer 25.
The optical interface of the second dense wavelength division multiplexer 25 is connected to the optical fiber link 3, the output end of the channel of the second dense wavelength division multiplexer 25C1 is connected to the optical input end of the second photodetector 24, the electrical output end of the second photodetector 24 is connected to the input end of the fourth electrical filter 23, the output end of the fourth electrical filter 23 is connected to the electrical input end of the third phase modulator 21, the output end of the third laser 22 is connected to the optical input end of the third phase modulator 21, the optical output end of the third phase modulator 21 is connected to the input end of the channel of the second dense wavelength division multiplexer 25C2, the output end of the channel of the second dense wavelength division multiplexer 25C3 is connected to the optical input end of the third photodetector 26, the output end of the third photodetector 26 is connected to the input end of the fifth electrical filter 27, and the output end of the fifth electrical filter 27 is connected to the input end of the subscriber.
Based on the same inventive concept, corresponding to any of the above embodiments, one or more embodiments of the present specification further provide an optical fiber stable radio frequency transmission method.
Referring to fig. 4, the method for stabilizing radio frequency transmission by using an optical fiber includes:
step S401, the local device 1 phase-modulates a target radio frequency signal of a reference atomic frequency source onto a first optical signal to form a first modulated optical signal, and transmits the first modulated optical signal to the remote device 2 through the optical fiber link 3.
In this step, the output clock signal of the atomic frequency source 11 of the local end device 1 is used as the clock input signal of the target rf signal source 113, so that the output signal of the target rf signal source 113 can keep synchronous with the atomic frequency source 11, and the signal sent by the target rf signal source 113 enters the optical fiber link 3 through the C1 channel of the wavelength division multiplexer 116 after being phase-modulated by the second phase modulator 115, and is sent to the C1 channel of the remote end device 2, so as to obtain the first modulated optical signal introduced with the phase noise by the optical fiber link transmission.
Step S402, the remote device 2 directly demodulates the received first modulated optical signal to obtain a demodulated optical signal by converting the chromatic dispersion introduced by the optical fiber link 3 into intensity, performs phase modulation on the demodulated optical signal to form a second modulated optical signal, and transmits the second modulated optical signal back to the local device 1 through the optical fiber link 3.
In this embodiment, an optical signal is transmitted through a common single-mode fiber in a phase modulation manner, and then is demodulated by a photodetector after having a dispersion effect with a certain dispersion coefficient, the first modulated optical signal is demodulated by a second photodetector 24 in a manner of converting dispersion into intensity of an electrical signal, and the demodulated signal is phase-modulated again by a phase modulator 21 to obtain the second modulated optical signal; the second modulated optical signal enters the optical fiber link 3 through the second dense wavelength division multiplexer 25C2 path and is transmitted back to the C2 path of the local end device 1.
Step S403, the local end device 1 demodulates and frequency-divides the second modulated optical signal, and then up-converts the second modulated optical signal and the auxiliary radio frequency signal referring to the atomic frequency source to the frequency of the target radio frequency signal to obtain a phase noise conjugate signal, and transmits the phase noise conjugate signal after phase modulation to the remote end device 2 through the optical fiber link 3.
In this step, the local end device 1 receives a second modulated optical signal transmitted from the C2 channel and demodulates the second modulated optical signal, divides the demodulated signal by two, band-pass filters the divided signal by the first electrical filter 15, inputs the band-pass filtered signal and the signal of the auxiliary radio frequency signal source 13 into the mixer 14 together for frequency mixing, and connects the mixed signal with the electrical amplifier 19 for power amplification; the power amplified signal is filtered by a third electric filter 110 to filter out a phase noise conjugate signal with the same frequency as the target radio frequency signal; the phase noise conjugate signal is phase-modulated by the first phase modulator 112, and then enters the optical fiber link 3 through the C3 path of the first dense wavelength division multiplexer 116 to be transmitted to the C3 path of the remote device 2. The phase noise conjugate signal carries a portion that is conjugate to the phase noise introduced by the optical fibre link 3.
Step S404, the remote device 2 demodulates the phase-modulated phase noise conjugate signal to obtain a third radio frequency signal.
In this step, the third photodetector 26 of the remote device 2 demodulates a signal of the C3 channel, the demodulated signal is filtered by the fifth electrical filter 27 to obtain the third radio frequency signal, and the fifth electrical filter 27 sends the third radio frequency signal to the user 28. The signal of the C3 channel sent by the local end device 1 uses its conjugate phase noise to cancel the phase noise introduced again by the optical fiber link 3 during the transmission of the optical fiber link 3, thereby completing the compensation of the phase noise introduced by the optical fiber link. The signal output to the user 28 is a stable rf signal with reference to the atomic frequency source 11 of the local end device 1, and has the same frequency as the target rf signal source 113.
In this embodiment, the frequency of the signal sent by the auxiliary rf signal source 13 is 1.5 times the frequency of the signal sent by the target rf signal source 113. This is because the signal sent by the target rf signal source 113 is detected by the first photodetector 18 after being transmitted back and forth, and then is divided by two to 0.5 times of frequency, and at this time, in order to obtain the conjugate phase noise, it is necessary to make a difference with the signal of 1.5 times of frequency, and recover to obtain 1 times of frequency for transmission.
As can be seen, in this embodiment, based on phase modulation and dispersion-to-strength demodulation, a target radio frequency signal of a reference atomic frequency source is modulated onto an optical signal in a phase modulation manner, and is transmitted to a remote device through an optical fiber link. The signal is demodulated at the remote device by converting the dispersion introduced by the fiber optic link into an electrical signal strength. The demodulated signal is modulated again and then transmitted back to the local end equipment, after the demodulation and the frequency division are carried out on the local end equipment, the local end equipment and another reference radio frequency signal of the local end equipment are subjected to up-conversion to the frequency of a target radio frequency signal, the conjugation of phase noise introduced by an optical fiber link is realized, the phase noise conjugate signal is transmitted to the remote end equipment through the optical fiber link again, and a user of the remote end equipment can obtain a stable radio frequency signal. Compared with the traditional intensity modulation mode, the phase modulator is low in insertion loss, does not need additional direct current bias control, is free from the influence of direct current drift, and reduces the complexity and cost of a system; meanwhile, the frequency mixer is used for realizing the phase conjugation of the signals, active feedback is not needed, the system is simple in structure and high in robustness, and the effect of stably transmitting the target radio frequency signals to the user side is achieved.
It should be noted that the above description describes certain embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the spirit of the present disclosure, features from the above embodiments or from different embodiments may also be combined, steps may be implemented in any order, and there are many other variations of different aspects of one or more embodiments of the present description as described above, which are not provided in detail for the sake of brevity.
In addition, well-known power/ground connections to Integrated Circuit (IC) chips and other components may or may not be shown in the provided figures, for simplicity of illustration and discussion, and so as not to obscure one or more embodiments of the disclosure. Furthermore, devices may be shown in block diagram form in order to avoid obscuring the understanding of one or more embodiments of the present description, and this also takes into account the fact that specifics with respect to implementation of such block diagram devices are highly dependent upon the platform within which the one or more embodiments of the present description are to be implemented (i.e., specifics should be well within purview of one skilled in the art). Where specific details (e.g., circuits) are set forth in order to describe example embodiments of the disclosure, it should be apparent to one skilled in the art that one or more embodiments of the disclosure can be practiced without, or with variation of, these specific details. Accordingly, the description is to be regarded as illustrative instead of restrictive.
While the present disclosure has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.
It is intended that the one or more embodiments of the present specification embrace all such alternatives, modifications and variations as fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of one or more embodiments of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (10)
1. An optical fiber stabilized radio frequency transmission system, characterized by comprising a local end device (1) and a remote end device (2) connected by an optical fiber link (3),
wherein the local end device (1) phase modulates a target radio frequency signal of a reference atomic frequency source onto a first optical signal to form a first modulated optical signal, and transmits the first modulated optical signal to the remote end device (2) via the optical fiber link (3);
the remote device (2) directly demodulates the received first modulated optical signal to obtain a demodulated optical signal by converting the dispersion introduced by the optical fiber link (3) transmission into intensity, and phase-modulates the demodulated optical signal to form a second modulated optical signal, which is transmitted back to the local device (1) via the optical fiber link (3);
the local end equipment (1) demodulates and divides the second modulated optical signal by two, and then up-converts the second modulated optical signal and an auxiliary radio frequency signal which is referred to the atomic frequency source to the frequency of the target radio frequency signal to obtain a phase noise conjugate signal, and transmits the phase noise conjugate signal after phase modulation to the remote end equipment (2) through the optical fiber link (3);
and the far-end equipment (2) demodulates the phase noise conjugate signal after phase modulation to obtain a third radio frequency signal.
2. The system according to claim 1, characterized in that the local end device (1) comprises: an atomic frequency source (11), an electric coupler (12), an auxiliary radio frequency signal source (13), a mixer (14), a first electric filter (15), a frequency halver (16), a second electric filter (17), a first photoelectric detector (18), an electric amplifier (19), a third electric filter (110), a first laser (111), a first phase modulator (112), a target radio frequency signal source (113), a second laser (114), a second phase modulator (115), a first dense wavelength division multiplexer (116),
wherein, the output end of the atomic frequency source (11) is connected with the input end of the electric coupler (12), the first output end of the electric coupler (12) is connected with the input end of a target radio frequency signal source (113), the second output end of the electric coupler (12) is connected with the input end of an auxiliary radio frequency signal source (13), the output end of the target signal source (113) is connected with the electric input end of a second phase modulator (115), the output end of a second laser (114) is connected with the optical input end of the second phase modulator (115), the optical output end of the second phase modulator (115) is connected with the C1 channel input end of a first dense wavelength division multiplexer (116), the optical interface of the first dense wavelength division multiplexer (116) is connected with the optical fiber link (3), the C2 channel output end of the first dense wavelength division multiplexer (116) is connected with the optical input end of a first photoelectric detector (18), the electric output end of the first photoelectric detector (18) is connected with, the output end of the second electrical filter (17) is connected with the input end of a frequency divider (16), the output end of the frequency divider (16) is connected with the input end of the first electrical filter (15), the output end of the first electrical filter (15) is connected with the first input end of a mixer (14), the second input end of the mixer (14) is connected with the output end of an auxiliary radio frequency signal source (13), the output end of the mixer (14) is connected with the input end of an electrical amplifier (19), the output end of the electrical amplifier (19) is connected with the input end of a third electrical filter (110), the output end of the third electrical filter (110) is connected with the electrical input end of a first phase modulator (112), the output end of a first laser (111) is connected with the optical input end of the first phase modulator (112), and the optical output end of the first phase modulator (112) is connected with the C3 channel input end of the first dense wave division multiplexer (116).
3. The system according to claim 1 or 2, characterized in that the remote device (2) comprises: a second photodetector (24), a fourth electrical filter (23), a third phase modulator (21), a third laser (22), a third photodetector (26), a fifth electrical filter (27), a user (28), a second dense wavelength division multiplexer (25),
the optical interface of the second dense wavelength division multiplexer (25) is connected with the optical fiber link (3), the C1 channel output end of the second dense wavelength division multiplexer (25) is connected with the optical input end of the second photoelectric detector (24), the electrical output end of the second photoelectric detector (24) is connected with the input end of the fourth electric filter (23), the output end of the fourth electric filter (23) is connected with the electrical input end of the third phase modulator (21), the output end of the third laser (22) is connected with the optical input end of the third phase modulator (21), the optical output end of the third phase modulator (21) is connected with the C2 channel input end of the second dense wavelength division multiplexer (25), the C3 channel output end of the second dense wavelength division multiplexer (25) is connected with the optical input end of the third photoelectric detector (26), the output end of the third photoelectric detector (26) is connected with the input end of the fifth electric filter (27), and the user end of the fifth electric filter (27) is connected with the input end of the fifth electric filter (28).
4. The system according to claim 2, wherein the auxiliary rf signal source (13) emits a signal at a frequency 1.5 times the frequency of the signal emitted by the target rf signal source (113).
5. A method for stable radio frequency transmission over optical fiber, comprising:
the local end equipment (1) phase-modulates a target radio frequency signal of a reference atomic frequency source onto a first optical signal to form a first modulated optical signal, and transmits the first modulated optical signal to the remote end equipment (2) through an optical fiber link (3);
the remote device (2) directly demodulates the received first modulated optical signal to obtain a demodulated optical signal by converting the dispersion introduced by the optical fiber link (3) transmission into intensity, and phase-modulates the demodulated optical signal to form a second modulated optical signal, which is transmitted back to the local device (1) via the optical fiber link (3);
the local end equipment (1) demodulates and divides the second modulated optical signal by two, and then up-converts the second modulated optical signal and an auxiliary radio frequency signal which is referred to the atomic frequency source to the frequency of the target radio frequency signal to obtain a phase noise conjugate signal, and transmits the phase noise conjugate signal after phase modulation to the remote end equipment (2) through the optical fiber link (3);
and the far-end equipment (2) demodulates the phase noise conjugate signal after phase modulation to obtain a third radio frequency signal.
6. The method according to claim 5, wherein the local end device (1) phase modulates a target radio frequency signal of a reference atomic frequency source onto a first optical signal to form a first modulated optical signal, and transmits the first modulated optical signal to a remote end device (2) via an optical fiber link (3), comprising:
an output clock signal of an atomic frequency source (11) of the local end equipment (1) is used as a clock input signal of the target radio frequency signal source (113), a signal sent by the target radio frequency signal source (113) enters the optical fiber link (3) through a C1 channel of the wavelength division multiplexer (116) after being subjected to phase modulation of the second phase modulator (115) and is sent to a C1 channel of the remote end equipment (2), and a first modulated optical signal with phase noise introduced by optical fiber link transmission is obtained.
7. The method according to claim 5, wherein the remote device (2) directly demodulates the received first modulated optical signal to obtain a demodulated optical signal by converting the dispersion introduced by the optical fiber link (3) transmission into intensity, and phase-modulates the demodulated optical signal to form a second modulated optical signal, which is transmitted back to the local device (1) via the optical fiber link (3), comprising:
the first modulated optical signal is demodulated by a second photoelectric detector (24) in a mode of converting dispersion into intensity of an electric signal, and the demodulated signal is subjected to phase modulation again by a phase modulator (21) to obtain a second modulated optical signal; and the second modulated optical signal enters the optical fiber link (3) through a C2 channel of the second dense wavelength division multiplexer (25) and is transmitted back to a C2 channel of the local end equipment (1).
8. The method according to claim 5, wherein the local end device (1) demodulates and divides the second modulated optical signal by two and up-converts the divided signal with an auxiliary radio frequency signal referring to the atomic frequency source to the frequency of the target radio frequency signal to obtain a phase noise conjugate signal, and transmits the phase noise conjugate signal after phase modulation to the remote end device (2) via the optical fiber link (3), comprising:
the local end equipment (1) receives a second modulated optical signal transmitted by a C2 channel, demodulates the second modulated optical signal, divides the demodulated signal into two parts, performs band-pass filtering on the divided signal by a first electric filter (15), inputs the filtered signal and a signal of an auxiliary radio frequency signal source (13) into a mixer (14) together for mixing, and connects the mixed signal with an electric amplifier (19) for power amplification; the signal after power amplification is filtered by a third electric filter (110) to filter out a phase noise conjugate signal with the same frequency as the target radio frequency signal; and after the phase noise conjugate signal is subjected to phase modulation by a first phase modulator (112), the phase noise conjugate signal enters the optical fiber link (3) through a C3 channel of a first dense wavelength division multiplexer (116) and is transmitted to a C3 channel of a remote device (2).
9. The method according to claim 5, wherein the remote device (2) demodulates the phase-modulated phase-noise conjugate signal to obtain a third radio frequency signal, comprising:
and a third photoelectric detector (26) of the far-end equipment (2) demodulates a signal of a C3 channel, the demodulated signal is filtered by a fifth electric filter (27) to obtain the third radio frequency signal, and the fifth electric filter (27) sends the third radio frequency signal to a user (28).
10. The method according to claim 5, characterized in that the frequency of the signal emitted by the auxiliary RF signal source (13) is 1.5 times the frequency of the signal emitted by the target RF signal source (113).
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| CN115632718A (en) * | 2022-09-15 | 2023-01-20 | 华北电力大学（保定） | Optical fiber radio frequency signal stable transmission system |
| CN117614541A (en) * | 2024-01-24 | 2024-02-27 | 华北电力大学（保定） | Optical fiber radio frequency signal stable transmission system and method |
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| CN117614541A (en) * | 2024-01-24 | 2024-02-27 | 华北电力大学（保定） | Optical fiber radio frequency signal stable transmission system and method |
| CN117614541B (en) * | 2024-01-24 | 2024-03-26 | 华北电力大学（保定） | Optical fiber radio frequency signal stable transmission system and method |
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| CN112671470B (en) | 2022-04-01 |
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