CN113346950A - Broadband radio frequency signal optical fiber phase-stabilizing transmission system device - Google Patents
Broadband radio frequency signal optical fiber phase-stabilizing transmission system device Download PDFInfo
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
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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
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
Abstract
The invention discloses a broadband radio frequency signal optical fiber phase stabilization method and a system, which comprise a local end and a remote end which are connected by a dispersion compensation module and an optical fiber. An auxiliary signal I with the frequency being half of the frequency of a signal to be transmitted and an auxiliary signal II with the frequency being 1.5 times of the frequency of the signal to be transmitted are modulated and filtered by an optical carrier at a local end to obtain an optical signal only containing the optical carrier, the signal I and the signal II corresponding to a first-order upper sideband, the signal is transmitted to a far end, the corresponding signal I and the signal II are demodulated, the signal I is modulated by the optical carrier with the other wavelength, then is continuously transmitted to the local end and is reflected back to the far end by an optical reflector, then the corresponding signal I is filtered out, and finally the signal I and the signal II at the far end are mixed at the far end to obtain a stable signal to be transmitted. The system of the invention has simple structure, is more practical and is easy to realize.
Description
Technical Field
The invention belongs to the technical field of microwave photons, and particularly relates to a broadband radio frequency signal optical fiber phase stabilizing method and system.
Background
The transmission modes of radio frequency signals are mainly divided into wired transmission and wireless transmission based on cable, overhead open wire, optical fiber and other modes. The cable-based wired transmission mode is heavy in size, high in manufacturing cost and serious in transmission attenuation, and is not beneficial to long-distance transmission of signals; the wireless transmission mode is very easy to be interfered by external electromagnetism and environment. The optical fiber has the characteristics of low loss, light weight, strong anti-electromagnetic interference capability and the like, and the optical fiber has the advantages of long distance, high stability, low loss and the like which can not be achieved by other transmission modes when used for transmitting radio frequency signals. However, due to the characteristics of the optical fiber, the optical fiber is easily interfered by external environmental factors (such as temperature change and mechanical vibration), so that the refractive index and the effective length of the optical fiber are changed, and thus the transmission delay in the optical fiber link is changed, and the phase of a signal transmitted in the optical fiber link is jittered. Therefore, it is necessary to research the phase-stable fiber transmission technology of radio frequency signals.
The traditional optical fiber phase-stabilizing transmission technology can be mainly divided into the following three types: (1) and (4) an optical compensation method. Such methods stabilize the phase of the radio frequency signal by directly compensating the delay of the optical fiber link, so that the phase compensation thereof is independent of the frequency of the signal to be transmitted, but the response rate thereof is slow and the adjustable range of the link is limited. (2) An electrical compensation method. The method realizes phase-stable transmission mainly by stabilizing the frequency and the phase of the signal to be transmitted, has higher response speed and infinite compensation range, but most of the systems are narrow-band, and the circuit for transmitting high-frequency signals is more complex. (3) And (4) mixing cancellation. In the method, two paths of signals with the same transmission delay are mixed so as to counteract delay jitter introduced from the outside; or the phase of the signal to be transmitted is pre-biased by mixing the signal with the transmission delay and the signal to be transmitted, and the phase of the pre-biased signal after being transmitted through the optical fiber is stabilized by reasonably designing a system. The phase-locked loop has an infinite adjustment range theoretically, does not need a complex phase demodulation circuit and a corresponding compensation circuit, has certain rapid compensation capability on the time delay jitter suddenly appearing in a link, and has higher requirements on electronic devices.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a radio frequency signal optical fiber transmission phase stabilization system device with limited bandwidth. The system device realizes the optical fiber phase-stable transmission of the limited bandwidth radio frequency signal based on the frequency mixing elimination principle.
A broadband radio frequency signal optical fiber phase-stabilized transmission system device comprises a local end and a far end which are connected by a dispersion compensation module and an optical fiber, and is characterized in that:
the local end modulates an auxiliary signal I with the frequency half of the frequency of a signal to be transmitted and an auxiliary signal II with the frequency 1.5 times of the frequency of the signal to be transmitted by an optical carrier and filters a lower sideband to obtain an optical signal only comprising the optical carrier, the signal I and the signal II corresponding to a first-order upper sideband, and the signal is transmitted to a remote end through a dispersion compensation module and an optical fiber;
the remote end demodulates a corresponding signal I and a corresponding signal II, modulates the signal I by an optical carrier with another wavelength, transmits the signal I to the local end and returns the signal I to the remote end, namely, the signal I is transmitted in the system for three times, and finally, the signal I and the signal II are mixed to obtain a stable signal to be transmitted;
further, the local end comprises a first electro-optical modulation module, an optical filter, an optical isolator, a first wavelength division multiplexer and a Faraday rotation mirror; wherein: the first electro-optical modulation module modulates a signal I with the frequency being half of the frequency of a signal to be transmitted and a signal II with the frequency being 1.5 times of the frequency of the signal to be transmitted through an optical carrier to obtain a double-sideband signal which comprises the optical carrier, the signal I and the signal II and corresponds to a first-order upper sideband and a first-order lower sideband, the lower sideband is filtered by an optical filter, and then the double-sideband signal is transmitted to a far end through an optical fiber module by sequentially passing through an optical isolator and a first wavelength division multiplexer; wherein:
the first wavelength division multiplexer couples the two wavelength signals into the same optical fiber link; the Faraday rotator mirror reflects a signal I which is modulated by another wavelength and then transmitted from the far end to the local end back to the far end again;
furthermore, the far end comprises a first electric filter, a second electric filter, a third electric amplifier, a first photoelectric detector, a second photoelectric modulation module, a second wavelength division multiplexer, an electric splitter, an optical circulator and a mixer; wherein: the first photoelectric detector demodulates the optical signal transmitted from the local end to obtain a corresponding signal I and a signal II, and the signal I is transmitted to an input end a of the frequency mixer; the signal II is modulated by an optical carrier wave with another wavelength in the second electro-optical modulation module, then is transmitted to the local end by the optical fiber module through the second wavelength division multiplexer, is reflected to the far end by the Faraday rotating mirror at the local end, is demodulated by the second photoelectric detector, is sent to the input end b of the frequency mixer, and is mixed with the signal I; wherein:
the first to third electric filters are band-pass filters for filtering out required signals; the first electric amplifier, the second electric amplifier and the third electric amplifier are used for amplifying the signals filtered by the electric filter, so that the loss in the signal transmission process is compensated; the second wavelength division multiplexer is used for separating two optical signals with different wavelengths coupled into the same optical fiber link; the electrical shunt is used for dividing the signal demodulated by the first photoelectric detector into two paths, one path is filtered by the first electrical filter to obtain a corresponding signal II and sent to the frequency mixer, the other path is filtered by the second electrical filter to obtain a corresponding signal I, and the signal I is sent to the second electro-optical modulation module to be subjected to single-side band modulation by an optical carrier with the other wavelength; the optical circulator is used for changing the transmission direction of signals to realize back-and-forth transmission;
furthermore, the dispersion compensation module is a section of dispersion compensation optical fiber and is used for compensating the delay influence on the signal due to different wavelengths of optical carriers or the drift and jitter of the carriers;
further, the first electro-optical modulation module comprises a first signal source, a second signal source, a first laser and a first electro-optical modulator; wherein:
the first signal source is used for generating a signal I with the frequency being half of the frequency of a signal to be transmitted, and the signal I can be a narrow-band signal or a wide-band signal with limited bandwidth; the second signal source is used for generating a signal II with the frequency 1.5 times that of the signal to be transmitted, and the signal II is used as a local oscillation signal; the first laser is used for providing a wavelength of lambda1The optical signal of (a); the first electro-optic modulator is a double parallel Mach-Zehnder modulator; the optical signal input port is connected with the optical output port of the first laser, and the two radio frequency input ports are respectively connected with the output ports of the first signal source and the second signal source;
further, the second electro-optical modulation module comprises a second laser, an electrical splitter, an electrical phase shifter and a second electro-optical modulator; wherein:
the second laser is used for providing a wavelength of lambda2The optical signal of (a); the electric shunt is used for dividing a signal I demodulated by the first photoelectric detector into two paths, one path is sent to a radio frequency input port of the second photoelectric modulator, and the other path is sent to the electric phase shifter; the electric phase shifter is used for electrically shifting the phase of the signal I demodulated by the photoelectric demodulator; the second electro-optical modulator is a double-level Mach-Zehnder modulator; the optical input port of the first laser is connected with the optical output port of the second laser, and the two radio frequency input ports of the first laser are respectively connected with the demodulated signal I and the phase-shifted signal I to realize single-sideband modulation;
further, the phase stabilization method of the optical fiber phase stabilization transmission system device is based on a frequency mixing elimination principle, and frequency mixing is carried out on an auxiliary signal I which is transmitted once in the system and has a frequency half of the frequency of a signal to be transmitted and an auxiliary signal II (the signal II is used as a local oscillator signal) which is transmitted three times back and forth in the system and has a frequency 1.5 times of the frequency of the signal to be transmitted, so that delay jitter introduced from the outside is directly counteracted, and a stable signal to be transmitted is obtained; on the premise that the frequency of a given signal to be transmitted is 2 omega, the larger the transmission bandwidth of an auxiliary signal I is, the worse the delay jitter compensation suppression ratio of the system is, and when the compensation suppression ratio is a, the maximum bandwidth of the signal which can be transmitted by the system is
。
Based on the technical scheme, the invention has the following beneficial technical effects:
(1) the invention realizes the phase-stable transmission of radio frequency signals based on the frequency mixing elimination principle, the system does not need a complex real-time phase detection module and a related phase compensation device, and single frequency mixing is adopted at the far end to realize the phase stabilization of the signals, thereby reducing the use of a frequency mixer, and having simpler system structure and quicker compensation response;
(2) the invention adopts the wavelength division multiplexing technology to couple optical signals with different wavelengths into one optical fiber for transmission, so that the practicability is stronger; the devices in the system are all devices which can be purchased in the market, and are easy to realize;
(3) the invention adopts double parallel Mach-Zehnder modulators, which can not only transmit dot-frequency signals of different frequency bands, but also realize the transmission of broadband signals.
Drawings
Fig. 1 is a diagram of a phase-stabilized transmission system for broadband radio-frequency signals.
In the figure: 101-a dispersion compensation module; 102-an optical fiber; 103-a first electro-optical modulation module; 104-an optical filter; 105-an optical isolator; 106-a first wavelength division multiplexer; 107-faraday rotator mirror; 108-110-first-third electrical filters; 111-113-first to third electric amplifiers; 114-a first photodetector; 115-a second photodetector; 116-a second electro-optic modulation module; 117-second wavelength division multiplexer; 118-an electrical shunt; 119-an optical circulator; 120-a mixer;
τ1～τ6-optical link fixed delay. Wherein, tau1The fixed time delay of an optical fiber link consisting of a 101 dispersion compensation module and 102 optical fibers; tau is2A fixed delay for the optical link of the 117 second wavelength division multiplexer port b to 114 first photodetector; tau is3Is a fixed delay of an optical link from the outlet of the second electro-optical modulation module 116 to port a of the optical circulator 119; tau is4Fixed delay for optical link of 119 optical circulator ports b to 117 second wavelength division multiplexer port c; tau is5Fixed delay for optical link from port c of 106 first wavelength division multiplexer to 107 faraday rotator mirror; tau is6Fixed delay of the optical link of the second photodetector for optical circulator ports c through 115.
Fig. 2 is a structural diagram of two electro-optic modulation modules according to the present invention. Wherein, (a) is the structure diagram of the first electro-optic modulation module; (b) is a structure diagram of a second electro-optic modulation module.
In the figure: 201-a first signal source; 202-a second signal source; 203-a first laser; 204-a first electro-optic modulator; 205-a second laser; 206-an electrical shunt; 207-electric phase shifter; 208-a second electro-optic modulator.
Detailed Description
In order to describe the present invention more specifically, the following detailed description of the technical solution of the present invention is provided with reference to the accompanying drawings:
as shown in fig. 1, a diagram of a phase-stabilized transmission system for broadband radio frequency signals by an optical fiber according to the present invention includes a local end and a remote end connected to an optical fiber 102 by a dispersion compensation module 101, wherein:
the local end comprises a first electro-optical modulation module 103, an optical filter 104, an optical isolator 105, a first wavelength division multiplexer 106 and a Faraday rotator mirror 107;
the far end comprises first to third electric filters 108 to 110, first to third electric amplifiers 111 to 113, a first photoelectric detector 114, a second photoelectric detector 115, a second electro-optical modulation module 116, a second wavelength division multiplexer 117, an electric splitter 118, an optical circulator 119 and a mixer 120.
Fig. 2 is a structural diagram of two electro-optical modulation modules according to the present invention. The structure diagram of the first electro-optical modulation module is shown in (a), and the first electro-optical modulation module structure diagram comprises a first signal source 201, a second signal source 202, a first laser 203 and a first electro-optical modulator 204; (b) the second electro-optical modulation module structure diagram comprises a second laser 205, an electrical splitter 206, an electrical phase shifter 207 and a second electro-optical modulator 208; the first electro-optical modulator is a double-parallel Mach-Zehnder modulator, and the second electro-optical modulator is a double-level Mach-Zehnder modulator.
Assuming that the frequency of the signal to be transmitted of the system is 2 ω, when the system transmits the narrowband signal, the first signal source 201 generates the frequency to be transmittedSignal iv at half frequency1(t) cos (ω t), the second signal source 202 generates a signal iv with a frequency 1.5 times the frequency of the signal to be transmitted2(t) cos (3 ω t), the first laser 203 generates a wavelength λ1Is input to the first electro-optical modulator 204 for modulating the radio frequency signal, which is a dual parallel mach-zehnder modulator, the generated dual sideband optical signal is filtered by the optical filter 104 to generate an optical signal containing only the first order upper sideband corresponding to the optical carrier, the signal i and the signal ii, which is connected to the port b of the first wavelength division multiplexer 106 through the optical isolator 105, at t1The time instant is connected to the common port a of the second wavelength division multiplexer 117, i.e. transmitted to the far end, through the dispersion compensation module 101 and the optical fiber 102.
At the far end, the optical signal is output through the port b of the second wavelength division multiplexer 117, and then is connected to the first photodetector 114 for demodulation, and the generated signal is divided into two paths by the electrical splitter 118, wherein one path is filtered by the first electrical band-pass filter 108 to obtain the corresponding signal ii, and is amplified by the first electrical amplifier 111. External delay jitter caused by factors such as fixed delay of the optical fiber and environment in the transmission process influences the stability of the transmission signal. Because the optical signals experience the same optical path in the process of being input into the optical fiber, the fixed time delay of the optical path is not considered, and the time delay introduced when the optical signals are transmitted from the local end to the far end for the first time is assumed to be tau1+τ2+Δτ(t1) The signal ii thus obtained is expressed as:
V′2(t)＝cos{3ω[t-(τ1+τ2+Δτ(t1))]} (1)
wherein, tau1And τ2For a fixed delay of the fibre, Δ τ (t)1) Is t1The signal is then fed into input a of mixer 120, at the time of the external delay jitter of the fiber link.
The other route is that the corresponding signal I is filtered by a second electric band-pass filter 109 and amplified by a second electric amplifier 112, and then used as the radio frequency input of a second electro-optical modulator 208, and lambda is generated by a second laser 2052Optical carrier single sideband modulation. The optical signal is input into the optical ringThe output from the port a of the circulator 119 is output to the port c of the second wavelength division multiplexer 117 via the port b of the circulator 119, and then the output is transmitted at t2The time is transmitted back to the local end through the optical fiber 102 and the dispersion compensation module 101, and is connected to the faraday rotator mirror 107 through the port c of the first wavelength division multiplexer 106. The time delay introduced by the fixed time delay of the optical fiber and the external time delay jitter in the process is tau3+τ4+τ1+τ5+Δτ(t2)。
The Faraday rotator mirror 107 reflects the signal, at t3The time is transmitted back to the far end through the dispersion compensation module 101 and the optical fiber 102, and is transmitted to the port b of the optical circulator through the port c of the second wavelength division multiplexer 117 at the far end, and then is transmitted to the second photoelectric detector 115 for demodulation through the port c of the optical circulator, and the corresponding signal I is filtered by the third electric band-pass filter 110 and then is amplified by the third electric amplifier 113, in the process, the time delay introduced by the influence of the fixed time delay of the optical fiber and the jitter of the external time delay is tau1+τ4+τ6+Δτ(t3) The expression for the signal i arriving at the far end after three transmissions is thus obtained:
V′2(t)＝cos{ω[t-(3τ1+τ2+τ3+2τ4+2τ5+τ6+Δτ(t1)+Δτ(t2)+Δτ(t3))]} (2)
wherein, tau1～τ6For fixing the time delay of the fibre, Δ τ (t)1)～Δτ(t3) External delay jitter at different times. The signal is sent to the input end b of the mixer 120 to be mixed with the signal II to obtain a signal to be transmitted with the frequency of 2 ω:
V(t)＝cos{2ωt-2ω[τ2-τ4-τ5+Δτ(t1)]+ω[τ3+τ6+Δτ(t2)+Δτ(t3)]} (3)
thus, the phase of the signal to be transmitted is:
the fixed delay term 2 tau of the optical fiber can be realized through reasonable design of the system4+2τ5-2τ2+τ3+τ6Is zero, i.e. 2 τ4+2τ5-2τ2+τ3+τ6Is equal to 0, and therefore has
Because the system does not need an additional phase compensation device, the compensation response speed is high, and the change speed of external jitter delay caused by external environmental factors is very low compared with the response speed of the system, t is t1、t2And t3The external delay jitter at a time is approximately the same, i.e. Δ τ (t)1)＝Δτ(t2)＝Δτ(t3) And therefore has a (t)2)+Δτ(t3)-2Δτ(t1)＝0。
Therefore, the invention can ensure that the phase of the signal to be transmitted is zero through reasonable design, and can realize the stable transmission of the signal to be transmitted.
When the above system transmits a broadband signal, there are frequency components that cannot be cancelled by mixing. Assuming that the largest frequency offset component that cannot be removed is V3(t)＝cos[(ω+Δω)t]Where Δ ω is the frequency offset.
According to the above technical solution, after the frequency component is transmitted three times to the far end, the expression becomes:
V3(t)＝cos{(ω+Δω)·[t-(3τ1+τ2+τ3+2τ4+2τ5+τ6+Δτ(t1)+Δτ(t2)+Δτ(t3))]} (5)
the frequency component is remote from the signal V'2(t) is mixed by mixer 120 resulting in:
thus, its phase is:
in each short system response time, the phase expression can be further simplified to be as follows according to the phase stability condition of the narrow-band signal:
the residual phase jitter of the far-end signal after phase stabilization shows the phase variation within a period of time, and the fixed delay of the optical fiber has no influence on the phase variation of the signal. Assuming that the variation of the external jitter is | Δ τ (t) | in the time period from 0 to t, the residual phase jitter of the phase of the far-end signal is
When the transmission is free, the expression is as follows:
V”(t)＝cos[(2ω-Δω)(t-(τ1+τ2+Δτ(t1)))] (9)
therefore, the residual phase jitter is:
therefore, after the phase stabilization system, the delay jitter compensation rejection ratio is:
therefore, on the premise that the frequency of a given signal to be transmitted is 2 omega, the larger the bandwidth of the auxiliary signal I is, the worse the delay jitter compensation suppression ratio of the system is; when the compensation suppression ratio is a, the maximum bandwidth of the transmittable signal of the system
The embodiments described above are presented to enable a person having ordinary skill in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to the above-described examples can be made, and the generic principles described herein can be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (7)
1. A broadband radio frequency signal optical fiber phase-stabilized transmission system device comprises a local end and a far end which are connected by a dispersion compensation module and an optical fiber, and is characterized in that:
the local end modulates an auxiliary signal I with the frequency half of the frequency of a signal to be transmitted and an auxiliary signal II with the frequency 1.5 times of the frequency of the signal to be transmitted by an optical carrier and filters a lower sideband to obtain an optical signal only comprising the optical carrier, the signal I and the signal II corresponding to a first-order upper sideband, and the signal is transmitted to a remote end through a dispersion compensation module and an optical fiber;
the remote end demodulates a corresponding signal I and a corresponding signal II, modulates the signal I by an optical carrier with another wavelength, transmits the signal I to the local end and returns the signal I to the remote end, namely, three times of transmission of the signal I in the system is realized, and finally, the signal I and the signal II are mixed to obtain a stable signal to be transmitted.
2. The apparatus of claim 1, wherein the apparatus comprises:
the local end comprises a first electro-optical modulation module, an optical filter, an optical isolator, a first wavelength division multiplexer and a Faraday rotator mirror; wherein: the first electro-optical modulation module modulates a signal I with the frequency being half of the frequency of a signal to be transmitted and a signal II with the frequency being 1.5 times of the frequency of the signal to be transmitted through an optical carrier to obtain a double-sideband signal which comprises the optical carrier, the signal I and the signal II and corresponds to a first-order upper sideband and a first-order lower sideband, the lower sideband is filtered by an optical filter, and then the double-sideband signal is transmitted to a far end through an optical fiber module by sequentially passing through an optical isolator and a first wavelength division multiplexer; wherein:
the first wavelength division multiplexer couples the two wavelength signals into the same optical fiber link;
the Faraday rotator mirror reflects a signal I modulated by another wavelength and transmitted from the far end to the local end back to the far end again.
3. The apparatus of claim 1, wherein the apparatus comprises:
the far end comprises first to third electric filters, first to third electric amplifiers, a first photoelectric detector, a second photoelectric modulation module, a second wavelength division multiplexer, an electric splitter, an optical circulator and a mixer; wherein: the first photoelectric detector demodulates the optical signal transmitted from the local end to obtain a corresponding signal I and a signal II, and the signal I is transmitted to an input end a of the frequency mixer; the signal II is modulated by an optical carrier wave with another wavelength in the second electro-optical modulation module, then is transmitted to the local end by the optical fiber module through the second wavelength division multiplexer, is reflected to the far end by the Faraday rotating mirror at the local end, is demodulated by the second photoelectric detector, is sent to the input end b of the frequency mixer, and is mixed with the signal I; wherein:
the first to third electric filters are band-pass filters for filtering out required signals;
the first electric amplifier, the second electric amplifier and the third electric amplifier are used for amplifying the signals filtered by the electric filter, so that the loss in the signal transmission process is compensated;
the second wavelength division multiplexer is used for separating two optical signals with different wavelengths coupled into the same optical fiber link;
the electrical shunt is used for dividing the signal demodulated by the first photoelectric detector into two paths, one path is filtered by the first electrical filter to obtain a corresponding signal II and sent to the frequency mixer, the other path is filtered by the second electrical filter to obtain a corresponding signal I, and the signal I is sent to the second electro-optical modulation module to be subjected to single-side band modulation by an optical carrier with the other wavelength;
the optical circulator is used for changing the transmission direction of signals and realizing round-trip transmission.
4. The apparatus of claim 1, wherein the apparatus comprises:
the dispersion compensation module is a section of dispersion compensation optical fiber and is used for compensating the delay influence on signals caused by different wavelengths of optical carriers or the drift and jitter of the carriers.
5. The local end according to claim 2, characterized in that: the first electro-optical modulation module comprises a first signal source, a second signal source, a first laser and a first electro-optical modulator; wherein:
the first signal source is used for generating a signal I with the frequency being half of the frequency of a signal to be transmitted, and the signal I can be a narrow-band signal or a wide-band signal with limited bandwidth;
the second signal source is used for generating a signal II with the frequency 1.5 times that of the signal to be transmitted, and the signal II is used as a local oscillation signal;
the first laser is used for providing a wavelength of lambda1The optical signal of (a);
the first electro-optic modulator is a double parallel Mach-Zehnder modulator; the optical signal input port is connected with the optical output port of the first laser, and the two radio frequency input ports are respectively connected with the output ports of the first signal source and the second signal source.
6. The distal end of claim 3, wherein: the second electro-optical modulation module comprises a second laser, an electric shunt, an electric phase shifter and a second electro-optical modulator; wherein:
the second laser is used for providing a wavelength of lambda2The optical signal of (a);
the electric shunt is used for dividing a signal I demodulated by the first photoelectric detector into two paths, one path is sent to a radio frequency input port of the second photoelectric modulator, and the other path is sent to the electric phase shifter;
the electric phase shifter is used for electrically shifting the phase of the signal I demodulated by the photoelectric demodulator;
the second electro-optical modulator is a double-level Mach-Zehnder modulator; the optical input port of the single-sideband modulator is connected with the optical output port of the second laser, and the two radio-frequency input ports of the single-sideband modulator are respectively connected with the demodulated signal I and the phase-shifted signal I to realize single-sideband modulation.
7. The apparatus of claim 1, wherein the apparatus comprises:
the phase stabilization method is based on a frequency mixing elimination principle, and directly offsets delay jitter introduced from the outside by mixing an auxiliary signal I with the frequency half of the frequency of a signal to be transmitted once in a system and an auxiliary signal II (the signal II is used as a local oscillator signal) with the frequency 1.5 times of the frequency of the signal to be transmitted three times in a back-and-forth transmission manner in the system, so that a stable signal to be transmitted is obtained; on the premise that the frequency of a given signal to be transmitted is 2 omega, the larger the transmission bandwidth of an auxiliary signal I is, the worse the delay jitter compensation suppression ratio of the system is, and when the compensation suppression ratio is a, the maximum bandwidth of the signal which can be transmitted by the system is
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|---|---|---|---|---|
| CN114726443A (en) * | 2022-02-25 | 2022-07-08 | 中国电子科技集团公司第二十九研究所 | Microwave photon bidirectional time-frequency transmission system, device and method |
| CN115225247A (en) * | 2022-07-11 | 2022-10-21 | 北京邮电大学 | Phase modulation loopback time synchronization device, method and system |
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| US20180048113A1 (en) * | 2015-04-08 | 2018-02-15 | Imra America, Inc. | Systems and methods for low noise frequency multiplication, division, and synchronization |
| CN112367120A (en) * | 2020-10-23 | 2021-02-12 | 西北工业大学 | Microwave local oscillation source double-frequency optical fiber phase-stabilizing transmission system |
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| CN104065416A (en) * | 2014-06-26 | 2014-09-24 | 中国科学院半导体研究所 | Microwave signal optical fiber stationary phase transmission system based on microwave phase shifter |
| US20180048113A1 (en) * | 2015-04-08 | 2018-02-15 | Imra America, Inc. | Systems and methods for low noise frequency multiplication, division, and synchronization |
| CN112367120A (en) * | 2020-10-23 | 2021-02-12 | 西北工业大学 | Microwave local oscillation source double-frequency optical fiber phase-stabilizing transmission system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114726443A (en) * | 2022-02-25 | 2022-07-08 | 中国电子科技集团公司第二十九研究所 | Microwave photon bidirectional time-frequency transmission system, device and method |
| CN114726443B (en) * | 2022-02-25 | 2023-09-19 | 中国电子科技集团公司第二十九研究所 | Microwave photon bidirectional time-frequency transmission system, device and method |
| CN115225247A (en) * | 2022-07-11 | 2022-10-21 | 北京邮电大学 | Phase modulation loopback time synchronization device, method and system |
| CN115225247B (en) * | 2022-07-11 | 2023-12-01 | 北京邮电大学 | Phase modulation loop-back time synchronization device, method and system |
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| CN113346950B (en) | 2022-08-05 |
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