CN113381815B - Dispersion-induced radio frequency power attenuation compensation method and system in optical fiber - Google Patents
Dispersion-induced radio frequency power attenuation compensation method and system in optical fiber Download PDFInfo
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- CN113381815B CN113381815B CN202110458415.3A CN202110458415A CN113381815B CN 113381815 B CN113381815 B CN 113381815B CN 202110458415 A CN202110458415 A CN 202110458415A CN 113381815 B CN113381815 B CN 113381815B
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—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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- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07951—Monitoring or measuring chromatic dispersion or PMD
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Abstract
The invention relates to a system and a method for compensating dispersion-induced radio frequency power attenuation in an optical fiber, wherein the system comprises an electro-optical modulator, an optical filter and a transmission channel, wherein the electro-optical modulator receives a radio frequency signal of an electric signal source to modulate an optical signal emitted by a laser, the optical signal output after being filtered by the optical filter enters the transmission channel consisting of the optical fiber and a dispersion compensation optical fiber, the length of the dispersion compensation optical fiber is calculated based on a dispersion coefficient at a central wavelength, the rough compensation of broadband signal power attenuation caused by optical fiber dispersion in a link is realized, and the compensated optical signal is transmitted to a photoelectric detector to be converted and transmitted to a radio frequency amplifier to be amplified and output; the vector network analyzer measures the frequency spectrum response in the compensated link and transmits the frequency spectrum response to the electric signal source, and the electric signal source adjusts the frequency spectrum of the output radio-frequency signal according to the frequency spectrum response measurement result, so that the frequency spectrum response is opposite to the frequency spectrum response of the dispersion compensated optical fiber link and then the frequency spectrum response is input to the link, and the complete correction of the frequency spectrum power fluctuation caused by the dispersion in the link is realized.
Description
Technical Field
The invention relates to the technical field of microwave photon, in particular to a dispersion-induced radio frequency power attenuation compensation method and system in an optical fiber.
Background
The air-to-ground defense needs further improvement of the detection distance of a radar system, and the transmission power and the antenna aperture of the existing single-station radar cannot be further improved, so that the detection distance is limited. One solution is to adopt a distributed radar architecture, and the key technology is the technology of radio frequency signal transmission between distributed radar stations. The existing medium for transmitting radio frequency signals is a radio frequency cable, and the defects of the existing medium are as follows: the loss is large, and the higher the radio frequency is, the larger the loss is; the weight is heavy, which is not favorable for long-distance laying. With the high frequency of the radar working frequency, the existing radio frequency cable transmission technology obviously cannot effectively support the development of the distributed radar. The microwave photon technology can realize the remote transmission of radio frequency signals by means of optical fibers. Compared with the traditional radio frequency cable, the optical fiber has the remarkable advantages of low loss, light weight, electromagnetic interference resistance and the like, but the dispersion of the optical fiber can remarkably influence the transmission quality of radio frequency signals.
Dispersion refers to different delays caused by different group velocities of light with different wavelengths propagating in a medium. The dispersion of the optical fiber causes the transmission rate of the radio frequency signal in the optical fiber to vary with the frequency. Chromatic dispersion can be broadly classified into modal dispersion, chromatic dispersion (material dispersion and waveguide dispersion are collectively referred to) and polarization mode dispersion, and chromatic dispersion and polarization dispersion generally play a major role. The different delays of the different frequency signals have two effects: firstly, the transmission pulse width can be widened, and secondly, the transmission of optical fibers with different frequencies shows the phenomenon of power periodic attenuation along with the frequency. Whether in the field of optical fiber communication or microwave photon, the compensation of chromatic dispersion is a main approach for solving the adverse effect of chromatic dispersion, and the compensation schemes are of 3 types: dispersion compensating fibers (Z.Pan, Q.Yu, Y.W.Song, and A.E.Willner, "40-Gb/s RZ 120-km transmission using a nonlinear-threaded Fiber Bragg grating (NL-FBG) for tunable Dispersion Compensation," in Optical Fiber Communication Conference and inhibition, 2002), 682-and 683) and chirped grating Compensation (G.Katz, D.Sadot, and J.Tabrik. n, "electric Dispersion Compensation in Optical Fiber distribution-and Detection Systems," IEEE Transactions on Communications 54, 2045-and 2050 (2050)). In the field of microwave photonics research, dispersion compensation has been used to solve the problem of power attenuation with frequency when a reference signal is transmitted, the tuning range of optoelectronic oscillators (j.wo, a.wang, j.zhang, p.du, y.wang, w.cong, x.xu, x.luo, and l.yu, "wide band frequency tunable electronic oscillator base on amplified microwave digital filter," Optical and Quantum Electronics 49,411(2017)), etc., but when the transmission signal is a swept frequency signal, there is an under-compensation problem (r.liu, a.wang, p.du, x.luo, y.wang, j.wo, h.yang, j.zhang, "vibration of frequency-frequency modulated Optical oscillator, and (r.wo. wo. yang, and j.zhang," vibration of frequency-wave, m. 12-frequency modulated Optical oscillator) and frequency-modulated Optical oscillator-wave-frequency. At present, researches are conducted on optical carrier single-frequency reference signal transmission links, high-precision compensation for optical carrier broadband signals is not reported, and the development requirements of distributed broadband radars are difficult to meet.
In conclusion, in the prior art, high-precision compensation for optical-carrier broadband signals is still lacked, and the development requirement of the distributed broadband radar is difficult to meet.
Disclosure of Invention
Therefore, the invention provides a method and a system for compensating dispersion-induced radio frequency power attenuation in an optical fiber, which are used for overcoming the problems that high-precision compensation for optical carrier broadband signals is still lacked in the prior art, and the development requirements of a distributed broadband radar or other radio frequency systems are difficult to meet.
To achieve the above object, the present invention provides a system for compensating attenuation of dispersion-induced rf power in an optical fiber, comprising:
a laser connected to the electro-optic modulator for generating an optical signal;
the electro-optical modulator is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected with the laser and used for receiving optical carriers generated by the laser, the second interface is connected with an electric signal source and used for receiving radio-frequency signals generated by the electric signal source, the electro-optical modulator modulates the received radio-frequency signals onto optical signals emitted by the laser, and the third interface is connected with an output port of the vector network analyzer;
the optical filter is connected with the fourth interface of the electro-optical modulator and used for receiving the optical signal modulated by the electro-optical modulator, and the optical filter carries out filtering processing on the received modulated optical signal;
a photodetector connected to the optical filter through an optical fiber and a dispersion compensation fiber, the optical fiber and the dispersion compensation fiber being used to transmit the optical signal filtered by the optical filter to the photodetector, and the photodetector converting the received optical signal into an electrical signal;
and the radio frequency amplifier is connected with the photoelectric detector and used for receiving the electric signal converted by the photoelectric detector and amplifying the received electric signal, the amplified electric signal is divided into two paths, the first path is output through an output port of the radio frequency amplifier, the second path is connected with an input port of the vector network analyzer, the vector network analyzer transmits the measured frequency response result of the link to an electric signal source, and the electric signal source corrects the output radio frequency signal according to the received transmission result.
Further, the dispersion compensating fiber length L s Expressed as:
wherein D is 0 Representing the dispersion coefficient, D, of the optical fibre at the corresponding frequency of the optical carrier s Representing the dispersion coefficient, L, of the dispersion compensating fiber at the corresponding frequency of the optical carrier 0 Indicating the length of the fiber.
Further, the signal generated by the electric signal source is a broadband signal or a single-frequency signal.
Further, the optical filter is connected with an optical amplifier through an optical fiber, and the optical amplifier is connected with the photodetector through a dispersion compensation optical fiber.
Furthermore, the laser, the electro-optical modulator, the optical filter and the electrical signal source can be partially or completely integrated into the same module, and the photoelectric detector and the radio frequency amplifier can be integrated into the same module.
Further, the present invention also provides a dispersion-induced rf power attenuation compensation method in an optical fiber, comprising:
when an optical carrier radio frequency transmission link is constructed, a laser emits an optical signal, an electro-optic modulator receives a radio frequency signal emitted by an electrical signal source, modulates and outputs the optical signal emitted by the laser, an optical filter filters and outputs the filtered optical signal, the optical signal output by the optical filter is matched with a dispersion compensation optical fiber with a corresponding length through a dispersion coefficient at a central wavelength, the dispersion of the optical fiber in the link is compensated, and the compensated optical signal is transmitted to a photoelectric detector for conversion and is transmitted to a radio frequency amplifier for amplification and output;
the input end of the vector network analyzer is connected with the radio frequency amplifier, the output end of the vector network analyzer is connected with the electro-optical modulator, the measured frequency spectrum response of the compensated link is transmitted to the electric signal source, the electric signal source adjusts the amplitude of the power spectrum of the output radio frequency signal through the received frequency spectrum response information, the adjusted power spectrum is opposite to the frequency spectrum response characteristic of the dispersion compensated link, and the fluctuation of the power spectrum of the radio frequency signal caused by dispersion in the link is corrected.
Furthermore, the measurement mode of the vector network analyzer for measuring the link spectrum response is to measure once or measure in real time.
Compared with the prior art, the invention has the advantages that when the optical carrier radio frequency transmission link is constructed, the dispersion coefficient of the optical fiber for distribution at the central wavelength is matched with the dispersion compensation optical fiber with the corresponding length, so that the rough compensation of the branch dispersion effect is realized; the vector network analyzer is used for measuring the frequency spectrum response of the whole transmitting branch circuit after the link circuit is from the electro-optical modulator to the radio frequency amplifier, the response information is sent to a signal source such as an electric arbitrary waveform generator or a direct digital synthesizer, and the signal source utilizes the information to finely regulate and control the amplitude of the frequency spectrum of the output electric signal, so that the signal source has the frequency spectrum response which is just opposite to the link circuit after the dispersion light compensation, the fine compensation of the link dispersion is realized, the fine compensation and the fine compensation can be jointly exerted, the high-precision correction of the frequency spectrum fluctuation caused by the link dispersion can be realized, and the defect that the full compensation of all frequencies cannot be realized according to the dispersion compensation optical fiber or the optical fiber grating is solved.
Furthermore, the invention provides a compensation method for inducing radio frequency power attenuation by dispersion in an optical fiber, which can realize comprehensive correction of power attenuation caused by dispersion of the dispersion compensation optical fiber and electric domain precompensation, realize main compensation by using the dispersion compensation optical fiber and realize fine compensation by using the electric domain precompensation.
Drawings
FIG. 1 is a schematic diagram of a dispersion-induced RF power attenuation compensation system for an optical fiber according to the present invention;
FIG. 2 is a schematic diagram showing a comparison between a link spectral response and an arbitrary waveform generator spectral response measured by the vector network analyzer according to the present invention.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principles of the present invention, and do not limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a dispersion-induced rf power attenuation compensation system in an optical fiber according to an embodiment of the present invention, including a laser source, an electro-optical modulator, an optical filter, an optical fiber, a dispersion compensation optical fiber, a photodetector, an rf amplifier, a vector network analyzer, and an electrical signal source.
Specifically, in the embodiment of the present invention, the laser is connected to the electro-optical modulator for generating the optical signal; the electro-optical modulator is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected with the laser and used for receiving optical carriers generated by the laser, the second interface is connected with an electric signal source and used for receiving radio-frequency signals generated by the electric signal source, the electro-optical modulator modulates the received radio-frequency signals onto optical signals emitted by the laser, and the third interface is connected with an output port of the vector network analyzer; the optical filter is connected with the fourth interface of the electro-optical modulator and used for receiving the optical signal modulated by the electro-optical modulator, and the optical filter carries out filtering processing on the received modulated optical signal; a photodetector connected to the optical filter through an optical fiber and a dispersion compensation fiber, the optical fiber and the dispersion compensation fiber being used to transmit the optical signal filtered by the optical filter to the photodetector, and the photodetector converting the received optical signal into an electrical signal; and the radio frequency amplifier is connected with the photoelectric detector and used for receiving the electric signal converted by the photoelectric detector and amplifying the received electric signal, the amplified electric signal is divided into two paths, the first path is output through an output port of the radio frequency amplifier, the second path is connected with an input port of the vector network analyzer, the vector network analyzer transmits the measured frequency response result of the link to an electric signal source, and the electric signal source pre-adjusts the power spectrum of the output radio frequency signal according to the received transmission result.
Specifically, in the embodiment of the present invention, a laser emits an optical signal, an electro-optical modulator receives a radio frequency signal of an electrical signal source to modulate the optical signal emitted by the laser, an optical filter filters the filtered optical signal, and the optical signal output by the optical filter enters a transmission channel composed of an optical fiber and a dispersion compensation optical fiber, wherein the length of the dispersion compensation optical fiber is calculated based on a dispersion coefficient at a central wavelength, so as to realize coarse compensation of broadband signal power attenuation caused by optical fiber dispersion in a link, and the compensated optical signal is transmitted to a photodetector to be converted and transmitted to a radio frequency amplifier for amplification and output; the vector network analyzer measures the frequency spectrum response in the compensated link and transmits the frequency spectrum response to the electric signal source, and the electric signal source adjusts the frequency spectrum of the output radio-frequency signal according to the frequency spectrum response measurement result, so that the frequency spectrum response is opposite to the frequency spectrum response of the dispersion compensated optical fiber link and then the frequency spectrum response is input to the link, and the complete correction of the frequency spectrum power fluctuation caused by the dispersion in the link is realized. The invention realizes main compensation by using the dispersion compensation optical fiber and fine compensation by using electric domain precompensation, and meets the development requirement of a distributed broadband radio frequency system.
Specifically, in the embodiment of the invention, when an optical carrier radio frequency transmission link is constructed, dispersion compensation optical fibers with corresponding lengths are matched for the optical fibers for distribution according to dispersion coefficients at the central wavelength, so that coarse compensation for the dispersion effect of the branch is realized; the vector network analyzer is used for measuring the frequency spectrum response of the whole transmitting branch circuit after the link circuit is from the electro-optical modulator to the radio frequency amplifier, the response information is sent to a signal source such as an electric arbitrary waveform generator or a direct digital synthesizer, and the signal source utilizes the information to finely regulate and control the amplitude of the frequency spectrum of the output electric signal, so that the signal source has the frequency spectrum response which is just opposite to the link circuit after the dispersion light compensation, the fine compensation of the link dispersion is realized, the fine compensation and the fine compensation can be jointly exerted, the high-precision correction of the frequency spectrum fluctuation caused by the link dispersion can be realized, and the defect that the full compensation of all frequencies cannot be realized according to the dispersion compensation optical fiber or the optical fiber grating is solved.
Specifically, in the embodiment of the present invention, after an optical carrier generated by the laser enters the electro-optical modulator, a radio frequency signal generated by an electrical signal source is modulated onto the optical carrier, after the modulated optical signal enters the optical filter for filtering, a transmission medium formed by the optical fiber and the dispersion compensation optical fiber with a specific length transmits the filtered optical signal to the remote photodetector, the photodetector converts the optical signal into an electrical signal, and the radio frequency amplifier amplifies the electrical signal, where the laser, the electro-optical modulator, and the optical filter are all connected by the optical fiber, and the other devices are all connected by cables.
Specifically, in the embodiment of the present invention, the vector network analyzer is a measurement instrument in the system, when the vector network analyzer works, an output port of the vector network analyzer is connected to an input port of the electro-optical modulator, an input port of the vector network analyzer is an output port of the radio frequency amplifier, a frequency response of the link can be measured after the connection, a measurement result is transmitted to the electric signal source, and the electric signal source performs reverse pre-adjustment on a power spectrum of a signal output by the electric signal source according to the measurement result.
Specifically, in the embodiment of the present invention, the types of the electro-optical modulator, the optical filter, and the photodetector may be determined according to the composite function of the link, and the present invention does not specifically limit the types of the electro-optical modulator, the optical filter, and the photodetector, which is subject to specific implementation.
Specifically, in the embodiment of the present invention, the parameter settings of the electro-optical modulator and the optical filter should be determined according to the complex function of the link. The invention does not specifically set the parameters of the electro-optical modulator and the optical filter, and takes the specific implementation as the standard.
Specifically, in the embodiment of the present invention, the signal generated by the electrical signal source is a broadband signal or a single-frequency signal, and the optical broadband radio frequency transmission link function can be combined with signal processing functions such as up-down frequency conversion and frequency doubling.
Specifically, in the embodiment of the present invention, an optical amplifier may be added in the link to amplify the optical information, where the optical amplifier is between an optical filter and a photodetector, the optical filter is connected to the optical amplifier through an optical fiber, and the optical amplifier is connected to the photodetector through a dispersion compensation optical fiber.
Specifically, in the embodiment of the present invention, in combination with an optoelectronic hybrid integration technology, the laser, the electro-optical modulator, the optical filter, and the electrical signal source can be partially or completely integrated into the same module, and the photodetector and the radio frequency amplifier can be integrated into the same module.
Specifically, the laser in the embodiment of the invention adopts a semiconductor laser and an electro-optical modulator adopts a Mark-Jensend modulator, the English abbreviation of the Mark-Jensend modulator is MZM, the optical filter adopts an optical fiber filter, the optical amplifier adopts an erbium-doped optical fiber amplifier, the English abbreviation of the erbium-doped optical fiber amplifier is EDFA, the optical fiber adopts a single-mode optical fiber, the electric signal source adopts an arbitrary waveform generator, the English abbreviation of the arbitrary waveform generator is AWG, specifically, the semiconductor laser generates an optical carrier signal which is sent to the Mark-Jensend modulator, the optical signal is modulated by a radio frequency signal generated by the arbitrary waveform generator at the Mark-Jensend modulator, the modulated signal is filtered by the optical fiber filter to remove unnecessary spectral components and then enters the single-mode optical fiber and the dispersion compensation optical fiber for transmission, the signals after transmission are sent to a photoelectric detector to be converted into electric signals, and a radio frequency amplifier is used for amplifying the electric signals.
Specifically, in the embodiment of the present invention, the connection lines between the devices in the link are configured as optical fibers or microwave cables as needed.
Please refer to fig. 2, which is a schematic diagram illustrating a comparison between a spectrum response of a link measured by a vector network analyzer and a spectrum response of an arbitrary waveform generator, where the left side is a spectrum response diagram of the link measured by the vector network analyzer, and the right side is a spectrum response diagram of the arbitrary waveform generator measured by the vector network analyzer.
Specifically, in the embodiment of the present invention, the length L of the dispersion compensation fiber s Expressed as:
wherein D is 0 Representing the dispersion coefficient, D, of the optical fibre at the corresponding frequency of the optical carrier s Representing the dispersion coefficient, L, of the dispersion compensating fiber at the corresponding frequency of the optical carrier 0 The fiber length is indicated.
The invention also provides a dispersion-induced radio frequency power attenuation compensation method in the optical fiber, which comprises the following steps: when an optical carrier radio frequency transmission link is constructed, a laser emits an optical signal, an electro-optic modulator receives a radio frequency signal emitted by an electric signal source, modulates and outputs the optical signal emitted by the laser, an optical filter filters and outputs the filtered optical signal, the optical signal output by the optical filter is matched with a dispersion compensation optical fiber with a corresponding length through a dispersion coefficient at a central wavelength, the dispersion of the optical fiber in the link is compensated, and the compensated optical signal is transmitted to a photoelectric detector for conversion and is transmitted to a radio frequency amplifier for amplification and output.
Specifically, in the embodiment of the present invention, an input end of the vector network analyzer is connected to the radio frequency amplifier, an output end of the vector network analyzer is connected to the electro-optical modulator, the measured spectrum response in the compensated link is transmitted to the electrical signal source, and the electrical signal source adjusts the amplitude of the power spectrum of the output radio frequency signal according to the received spectrum response information, so that the adjusted spectrum power spectrum is opposite to the spectrum response characteristic of the whole link after dispersion compensation, and the power spectrum fluctuation of the radio frequency signal caused by dispersion in the link is corrected.
Specifically, in the embodiment of the present invention, the measurement mode of the vector network analyzer for measuring the link spectrum response is to perform measurement once or in real time.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can be within the protection scope of the invention.
Claims (7)
1. A dispersion-induced rf power attenuation compensation system in an optical fiber, comprising:
a laser connected to the electro-optic modulator for generating an optical signal;
the electro-optical modulator is provided with a first interface, a second interface, a third interface and a fourth interface, the first interface is connected with the laser and used for receiving optical carriers generated by the laser, the second interface is connected with an electric signal source and used for receiving radio-frequency signals generated by the electric signal source, the electro-optical modulator modulates the received radio-frequency signals onto optical signals emitted by the laser, and the third interface is connected with an output port of the vector network analyzer;
the optical filter is connected with the fourth interface of the electro-optical modulator and used for receiving the optical signal modulated by the electro-optical modulator, and the optical filter carries out filtering processing on the received modulated optical signal;
a photodetector connected to the optical filter through an optical fiber and a dispersion compensation fiber, the optical fiber and the dispersion compensation fiber being used to transmit the optical signal filtered by the optical filter to the photodetector, and the photodetector converting the received optical signal into an electrical signal;
and the radio frequency amplifier is connected with the photoelectric detector and used for receiving the electric signal converted by the photoelectric detector and amplifying the received electric signal, the amplified electric signal is divided into two paths, the first path is output through an output port of the radio frequency amplifier, the second path is connected with an input port of the vector network analyzer, the vector network analyzer transmits the measured frequency response result of the link to an electric signal source, and the electric signal source corrects the output radio frequency signal according to the received transmission result.
2. The system of claim 1, wherein the dispersion compensating fiber length L is a length of dispersion-inducing rf power attenuation compensation s Expressed as:
wherein D is 0 Representing optical fibres at corresponding frequencies of optical carrierCoefficient of dispersion, D s Representing the dispersion coefficient, L, of the dispersion compensating fiber at the corresponding frequency of the optical carrier 0 Indicating the length of the fiber.
3. The system according to claim 1, wherein the signal generated by the electrical signal source is a broadband signal or a single frequency signal.
4. The system of claim 1, wherein the optical filter is coupled to an optical amplifier via an optical fiber, and the optical amplifier is coupled to the photodetector via a dispersion compensating fiber.
5. The system of claim 1, wherein the laser, the electro-optic modulator, the optical filter, and the electrical signal source can be partially or completely integrated into a same module, and the photodetector and the rf amplifier can be integrated into a same module.
6. A method for compensating for dispersion induced rf power attenuation in an optical fiber using the system of any one of claims 1-5, comprising:
when an optical carrier radio frequency transmission link is constructed, a laser emits an optical signal, an electro-optic modulator receives a radio frequency signal emitted by an electrical signal source, modulates and outputs the optical signal emitted by the laser, an optical filter filters and outputs the filtered optical signal, the optical signal output by the optical filter is matched with a dispersion compensation optical fiber with a corresponding length through a dispersion coefficient at a central wavelength, the dispersion of the optical fiber in the link is compensated, and the compensated optical signal is transmitted to a photoelectric detector for conversion and is transmitted to a radio frequency amplifier for amplification and output;
the input end of the vector network analyzer is connected with the radio frequency amplifier, the output end of the vector network analyzer is connected with the electro-optical modulator, the measured frequency spectrum response in the link is transmitted to the electric signal source, the electric signal source adjusts the amplitude of the frequency spectrum of the output radio frequency signal through the received frequency spectrum response information, the adjusted frequency spectrum power spectrum is opposite to the frequency spectrum response of the whole link after the dispersion compensation optical fiber is compensated, and the correction of the fluctuation of the power spectrum of the transmission radio frequency signal caused by the dispersion in the link is realized.
7. The method of claim 6, wherein the vector network analyzer measures the spectral response of the link in one or real time.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1650294A (en) * | 2002-02-27 | 2005-08-03 | 勒克罗伊公司 | Digital frequency response compensator and arbitrary response generator system |
| CN102680950A (en) * | 2012-04-28 | 2012-09-19 | 电子科技大学 | Frequency point power self-adaptive control method for stepped frequency through-wall radar |
| CN103235374A (en) * | 2013-04-15 | 2013-08-07 | 华中科技大学 | Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter |
| CN106092520A (en) * | 2016-08-02 | 2016-11-09 | 中国电子科技集团公司第三十八研究所 | The measurement apparatus of Distributed Feedback Laser frequency noise and method |
| CN111427172A (en) * | 2020-04-09 | 2020-07-17 | 大连理工大学 | Microwave photon filter based on spectrum segmentation light source |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3384322B2 (en) * | 1998-04-23 | 2003-03-10 | 日立電線株式会社 | Chromatic dispersion measuring method and chromatic dispersion measuring device |
| US6901188B2 (en) * | 2001-03-15 | 2005-05-31 | 3M Innovative Properties Company | Dispersion compensation modules with fiber Bragg gratings |
| CN106153225B (en) * | 2016-06-28 | 2018-11-16 | 南京师范大学 | A kind of fiber bragg grating transverse pressure sensing system and measurement method |
-
2021
- 2021-04-27 CN CN202110458415.3A patent/CN113381815B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1650294A (en) * | 2002-02-27 | 2005-08-03 | 勒克罗伊公司 | Digital frequency response compensator and arbitrary response generator system |
| CN102680950A (en) * | 2012-04-28 | 2012-09-19 | 电子科技大学 | Frequency point power self-adaptive control method for stepped frequency through-wall radar |
| CN103235374A (en) * | 2013-04-15 | 2013-08-07 | 华中科技大学 | Microwave photon filter of multi-wavelength light source and tuning and reconfiguring method of microwave photon filter |
| CN106092520A (en) * | 2016-08-02 | 2016-11-09 | 中国电子科技集团公司第三十八研究所 | The measurement apparatus of Distributed Feedback Laser frequency noise and method |
| CN111427172A (en) * | 2020-04-09 | 2020-07-17 | 大连理工大学 | Microwave photon filter based on spectrum segmentation light source |
Non-Patent Citations (1)
| Title |
|---|
| 基于多色散器件并联的多通带微波光子滤波器;赵彪等;《空军预警学院学报》;20181015(第05期);全文 * |
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