CN111901041A - Large dynamic signal demodulation model device based on phase modulation - Google Patents
Large dynamic signal demodulation model device based on phase modulation 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
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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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
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
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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
- H04B10/70—Photonic quantum communication
Abstract
The invention belongs to the technical field of microwave photon, and particularly relates to a phase modulation-based large dynamic signal demodulation model device; the demodulation model device comprises an optical frequency comb source, an optical amplification module, a phase modulation module, a radio frequency source module, an optical filtering module, a frequency locking control module and a photoelectric detection module, wherein the optical frequency comb source is connected with an optical input port of the phase modulation module after passing through the optical amplification module, a radio frequency signal output by the radio frequency source module is connected with a radio frequency input port of the phase modulation module, and an optical signal output by the phase modulation module is divided into two paths after being processed by the optical filtering module: the first path is connected with the frequency locking control module to generate a feedback signal and output the feedback signal to the optical frequency comb source, and the absolute comb frequency of the optical frequency comb source is controlled and adjusted; the second path is connected with the photoelectric detection module to generate and output radio frequency signals; the invention provides phase-locked dual-wavelength laser by using the optical frequency comb source, and realizes the precise adjustment and inhibition of high-order stray signals, thereby improving the third-order intermodulation value and the dynamic range of a link.
Description
Technical Field
The invention belongs to the technical field of microwave photons, and particularly relates to a phase modulation-based large dynamic signal demodulation model device.
Background
The transmission characteristics of large dynamic, broadband radio frequency signals are the core requirements of electronic information equipment such as next generation radars, electronic warfare, and communication. The coaxial cable commonly used for radio frequency signal transmission is used as a transmission medium, so that the problems of large volume, heavy weight, weak anti-electromagnetic interference capability, large loss and the like exist. The microwave photon technology modulates radio frequency signals onto optical carriers, and long-distance transmission is carried out by taking optical fibers as transmission media; the technology has the following advantages:
(1) the optical fiber has small volume, light weight and good flexibility; (2) the anti-electromagnetic interference capability is strong; (3) the transmission loss is low; (4) the working bandwidth is large; the eigenfrequency of the light wave is 200THz, which is 4 to 5 orders of magnitude higher than that of the microwave. (5) The multiplexing capability is strong, and the parallel transmission can be realized through one optical fiber. The large dynamic radio frequency signal optical transmission technology is just one of the most core technologies in the microwave photon technology. Therefore, the key technology of large dynamic radio frequency signal light transmission cannot be kept away from electronic information equipment such as radars, electronic warfare and communication and the like constructed on the basis of the microwave photon technology in the future.
Further, the improvement of the dynamic range of the microwave optical transmission link can be mainly realized by two ways: firstly, a nonlinear third-order intermodulation point is effectively improved; one is to reduce the system noise floor. In general, the system noise suppression space is limited, so the former is the main approach to achieve large dynamic range. The microwave signal based on the phase modulation is completely linear in principle, and has the potential of higher nonlinear third-order intermodulation point and dynamic range compared with the traditional intensity modulation. And as long as the higher linearity of the phase demodulation process is ensured, a larger dynamic range of the whole system can be obtained. Therefore, how to achieve high-linearity phase demodulation has been a hot research focus in recent years.
At present, the phase modulation-based large dynamic demodulation mode mainly comprises a phase-locked loop, cascaded optical filtering linear demodulation, dual-wavelength third-order intermodulation cancellation and the like. The phase-locked loop has a large dynamic range, but is limited by phase-locked delay, and the bandwidth of the phase-locked loop is usually in the magnitude of less than GHz; the cascade optical filtering has the advantages of high linearity, large dynamic and large bandwidth, but the bias point control of the cascade optical filtering is more complex, the dual-wavelength three-order intermodulation cancellation has the characteristic of large dynamic and large bandwidth, but the complexity of the system in the aspects of light source control and optical filtering is increased by the independent dual light sources, and the wide application of the phase modulation-based large dynamic microwave optical link is severely limited.
Disclosure of Invention
The invention aims to provide a large dynamic signal demodulation model device based on phase modulation according to the defects of the prior art. According to the invention, the optical frequency comb source is used for generating phase-locked dual-wavelength laser, meanwhile, the feedback is used for locking the dual-wavelength laser to the optical filter, and the loaded radio frequency sideband is effectively controlled based on the filtering characteristic of the optical filter, so that the high-order stray signals are counteracted and suppressed, the suppression of the high-order stray signals is effectively realized, and the third-order intermodulation value and the dynamic range of a link are improved. The system has simple structure, feeds back the absolute optical frequency of the optical frequency comb source in real time, outputs stable radio frequency signals with large dynamic range and large bandwidth, and can meet the application in the fields of communication, radar, electronic stations and the like.
The invention provides a phase modulation-based large dynamic signal demodulation model device, which comprises an optical frequency comb source, an optical amplification module, a phase modulation module, a radio frequency source module, an optical filtering module, a frequency locking control module and a photoelectric detection module, wherein the optical frequency comb source is connected with an optical input port of the phase modulation module after passing through the optical amplification module, a radio frequency signal output by the radio frequency source module is connected with a radio frequency input port of the phase modulation module, and an optical signal output by the phase modulation module is divided into two paths after being processed by the optical filtering module: the first path is connected with the frequency locking control module to generate a feedback signal and output the feedback signal to the optical frequency comb source, and the absolute comb tooth frequency of the optical frequency comb source is controlled and adjusted; the second path is connected with the photoelectric detection module to generate a radio frequency signal and output the radio frequency signal.
Further, the optical frequency comb source has locked comb tooth intervals and stable optical power, the generation method can be based on a microcavity technology, a quantum dot mode locking technology or an electrical cascade modulation technology, and the absolute comb tooth frequency of the optical frequency comb source can be adjusted through feedback.
Furthermore, the output power and the noise coefficient of the optical amplification module are adjustable, and the optical amplification module can be an optical fiber amplifier or a space solid optical amplifier.
Furthermore, the phase modulation module comprises a phase modulator and a transmission optical fiber, the phase modulator is connected with the radio frequency source module, and the transmission optical fiber is connected with the optical filtering module; the working bandwidth of the phase modulator can cover the radio frequency corresponding to the comb tooth interval of the optical frequency comb source.
Further, the optical filtering module comprises a first optical fiber dense wavelength division optical filter and a second optical fiber dense wavelength division optical filter; the rear ends of the two optical filters are connected with an optical fiber beam combiner and an optical fiber beam splitter.
Preferably, band-pass optical filtering and beam splitting function are accomplished to the optical filtering module, band-pass optical filtering function has high flatness and sideband suppression degree, can accomplish the filtering of two broach optical frequencies and the single sideband of optical frequency comb source is got and the filtering of straying. Wherein the implementation of the bandpass optical filtering function may include, but is not limited to, dense wavelength division filtering or AWG or any programmable filtering.
Furthermore, the frequency locking control module comprises a photoelectric detector and a frequency locking feedback system which are sequentially arranged; the frequency locking feedback module can perform real-time feedback adjustment on the absolute light frequency of the light frequency comb source, so that the relative position of the absolute light frequency and the optical filter band-pass is fixed and adjustable.
The invention has the advantages that:
1. the invention effectively loads the radio frequency signal to the optical frequency based on the phase modulation technology, does not need bias point control and has simple system;
2. the optical frequency comb source is adopted to generate phase-locked dual-wavelength laser, the frequency interval and the absolute optical frequency are easy to control, the precise control of the amplitude of the radio frequency third-order stray signal can be realized, and the dynamic range is effectively improved;
3. the optical frequency comb source is adopted to generate phase-locked dual-wavelength laser, the structure is simple, and system integration is facilitated; the use of actual equipment is met;
4. the optical filtering module adopted by the invention has high and adjustable filtering bandwidth, can realize filtering demodulation of dozens of GHz-level high-frequency radio-frequency signals, and meets the requirements of special fields such as radar, electronic warfare and the like;
5. the optical filtering module adopted by the invention has variable working wavelength, is suitable for high repetition frequency optical frequency combs with different wave bands, and can meet the requirements of different fields.
Drawings
FIG. 1 is a schematic structural diagram of a phase modulation-based large dynamic signal demodulation model device provided by the present invention;
FIG. 2 is a schematic diagram of a large dynamic control implementation device based on optical fiber dense wavelength division optical filtering according to the present invention;
FIG. 3 is a schematic diagram of an implementation device based on spatially arbitrary programmable optical filtering according to the present invention;
in the figure, 100, an optical frequency comb source; 200. a light amplification module; 300. a phase modulation module 301, a phase modulator 302 and a transmission fiber; 400. the radio frequency power divider comprises a radio frequency source module 401, a first radio frequency signal 402, a second radio frequency signal 403 and a radio frequency power divider; 500. an optical filtering module 501, a first optical fiber dense wavelength division optical filter 502, a second optical fiber dense wavelength division optical filter 503, an optical fiber beam combiner 504, an optical fiber beam splitter 505, 510, an optical fiber collimator 506, 509, a reflector 507, a transmission grating pair 508 and any programmable optical filtering reflector; 600. the system comprises a frequency locking control module 601, a photoelectric detector 602 and a frequency locking feedback system; 700. photoelectric detection module.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the drawings of the embodiments of the present invention, a solid line indicates an optical path and a short dashed line indicates an electric circuit, and the present invention will be described in detail below with reference to the specific drawings.
It should be noted that, since the embodiments of the present invention focus on demodulation of a laser signal, the laser in the present invention may exist in the form of an optical signal, a carrier signal, an optical frequency comb, a radio frequency signal, a frequency sideband signal, and the like, and those skilled in the art can correspondingly understand that, for example, the laser signal after passing through the optical-to-electrical conversion module is substantially a radio frequency signal.
In one embodiment, fig. 1 is a schematic diagram of a phase modulation-based large dynamic signal demodulation model device; taking a basic solution for solving the technical problems mentioned in the background art as an example, as shown in fig. 1, the present embodiment provides a phase modulation-based large dynamic signal demodulation model device, which includes a frequency comb source 100, an optical amplification module 200, a phase modulation module 300, a radio frequency source module 400, an optical filtering module 500, a frequency locking control module 600, and a photodetection module 700.
The output end of the optical frequency comb source 100 is connected with the input end of the optical amplification module 200, the optical amplification module 200 is connected with the phase modulation module 300 and the optical filtering module 500 in sequence after amplifying output, and meanwhile, the radio frequency source module 400 is connected with the radio frequency access end of the phase modulation module 300: the output of the optical filtering module 500 is divided into two paths: the first path is connected with the frequency comb source 100 through the frequency locking control module 600 to form a feedback closed loop, so as to control and adjust the absolute comb frequency of the optical frequency comb source 100; the second path directly outputs the required radio frequency signal through the photoelectric detection module 700.
In this embodiment, the optical frequency comb source 100 is used to generate a phase-locked dual-wavelength laser, the electro-optical modulation of the phase modulator is used to load the rf signal onto the dual-wavelength laser, the frequency shift control technique is used to lock the comb teeth of the optical frequency comb and the optical filter, and the filtering characteristic of the optical filter is used to effectively control the loaded rf sideband, so as to cancel and suppress the high-order spurious signal. The embodiment has the advantages that the optical frequency comb source can provide phase-locked dual-wavelength laser, and the precise adjustment and inhibition of high-order stray signals based on an optical filter are facilitated, so that the third-order intermodulation value and the dynamic range of a link are improved.
In a preferred embodiment, this embodiment further improves the demodulation model apparatus, and fig. 2 is a phase modulation-based large dynamic signal demodulation model apparatus with optical fiber dense wavelength division optical filtering as an improved core, as shown in fig. 2, the demodulation model apparatus includes:
the input end of the optical amplification module 200 is connected with the optical frequency comb source 100, and the output end is connected with the optical input port of the phase modulator 301; meanwhile, a first radio frequency signal 401 and a second radio frequency signal 402 are connected to the radio frequency power divider 403 and then connected to the radio frequency input port of the phase modulator 301; the output of the phase modulator 301 is divided into two paths after passing through a transmission fiber 302, a first fiber dense wavelength division optical filter 501, a second fiber dense wavelength division optical filter 502, a fiber combiner 503 and a fiber splitter 504 in sequence: the first path is directly connected with the photoelectric detection module 700 and then output; the second path passes through the photodetector 601 and then is connected to the input end of the frequency-locking feedback system 602, and the output end of the frequency-locking feedback system 602 is connected to the radio frequency input port of the optical frequency comb source 100 to form a closed loop.
In this embodiment, the working bandwidth of the phase modulator 301 may cover the radio frequency corresponding to the comb tooth interval of the optical frequency comb source 100, the first optical fiber dense wavelength division optical filter 501 and the second optical fiber dense wavelength division optical filter 502 both have narrowband bandpass filtering characteristics, the channel interval may cover the radio frequency corresponding to the comb tooth interval of the optical frequency comb source 100, and meanwhile, the sideband suppression degree is high, so that the stray sideband signal generated after the phase modulation may be suppressed and filtered; the optical fiber beam splitter 504 can split the laser beam, has a large working bandwidth, can ensure that all spectral components pass through, and has an adjustable splitting ratio; for example, the first rf signal 401 and the second rf signal 402 combined by the rf power splitter 403 are simultaneously loaded on the multi-wavelength carrier by the phase modulator 301; generating positive and negative frequency sidebands corresponding to the multi-wavelength carrier; the positive/negative single side bands of 1 comb tooth carrier and the negative/positive single side bands of the adjacent comb tooth carriers are respectively filtered, the amplitude ratio of the two comb tooth carriers can be adjusted by controlling the absolute light frequency of the light frequency comb source 100, the ratio is usually 1:3 optimal, the laser filtered by the passband is combined by the optical fiber beam combiner 503, then is divided into two paths after passing through the optical fiber beam splitter 504, and the beam splitting ratio can be adjusted to be usually 95: 5.
The frequency-locking feedback system 602 can realize the judgment and accurate feedback locking of the relative position of the absolute optical frequency of the comb teeth of the optical frequency comb source 100 with respect to the filter windows of the first optical fiber dense wavelength division optical filter 501 and the second optical fiber dense wavelength division optical filter 502; after photoelectric conversion is performed by the photoelectric detector 601, the generated electric signal can identify the relative position of the absolute optical frequency and the optical filter band-pass after identification and analysis of the frequency-locking feedback system 602, and a feedback signal is generated to control the optical frequency comb source 100 to complete accurate locking of the relative position.
In the embodiment, the optical frequency comb source is used for generating phase-locked dual-wavelength laser, so that the frequency interval and the absolute optical frequency are easy to control; the filtering of two comb carriers with positive/negative opposite single side bands is completed by utilizing optical fiber dense wavelength division optical filtering, and the phase-intensity conversion is completed by combining beam beat frequency, so that the device has the advantages of large bandwidth, strong practicability and simple structure; meanwhile, the optical frequency comb teeth and the filter are locked by using a frequency locking feedback technology, the suppression optimization of three-order stray signals can be effectively realized, the method does not need additional light source reference, the structure is simple, the real-time feedback technology is mature, the large dynamic range modulation-demodulation transmission of high-frequency broadband radio-frequency signals can be realized, and the application in the fields of communication, radar, electronic warfare and the like can be met.
In a preferred embodiment, this embodiment is another improvement of the demodulation model device, and fig. 3 is a phase modulation-based large dynamic signal demodulation model device with spatially arbitrary programmable optical filtering as an improved core, as shown in fig. 3, the demodulation model device includes:
the input end of the optical amplification module 200 is connected with the optical frequency comb source 100, and the output end is connected with the optical input port of the phase modulator 301; meanwhile, a first radio frequency signal 401 and a second radio frequency signal 402 are connected to the radio frequency power divider 403 and then connected to the radio frequency input port of the phase modulator 301; the output of the phase modulator 301 passes through the transmission fiber 302 and the fiber collimator 505 in sequence and then is converted into space light, passes through the mirror 506, passes through the transmission grating pair 507 and any programmable optical filter mirror 508 in a reciprocating manner, is coupled again through the mirror 509 and the fiber collimator 510, enters the fiber for transmission, and is divided into two paths through the fiber beam splitter 504: the first path is directly connected with the photoelectric detection module 700 and then output; the second path passes through the photodetector 601 and then is connected to the input end of the frequency-locking feedback system 602, and the output end of the frequency-locking feedback system 602 is connected to the radio frequency input port of the optical frequency comb source 100 to form a closed loop.
The working bandwidth of the phase modulator 301 can cover the radio frequency corresponding to the comb tooth interval of the optical frequency comb source 100, the combination of the transmission grating pair 507 and any programmable optical filtering reflector 508 has the characteristic of narrow-band-pass filtering, the band-pass morphology, the bandwidth and the center frequency can be adjusted at will, and the transmitted laser is subjected to band-pass filtering; the sideband suppression degree is high, the resolution ratio is far smaller than the radio frequency corresponding to the first radio frequency signal 401 and the second radio frequency signal 402, and stray sideband signals generated after phase modulation can be suppressed and filtered; the optical fiber beam splitter 504 can split the laser beam, has a large working bandwidth, can ensure that all spectral components pass through, and has an adjustable splitting ratio; the positive/negative single side bands of 1 comb tooth carrier and the negative/positive single side bands of the adjacent comb tooth carriers are respectively filtered, the amplitude ratio of the two comb tooth carriers can be adjusted by controlling the absolute optical frequency of the optical frequency comb source 100, the ratio is usually 1:3 optimal, the optical fiber collimators 505 and 510 are respectively used for carrying out optical fiber-optical fiber and optical fiber-space coupling conversion on laser, the working distance of the optical fiber collimators and the optical fiber-space coupling conversion is required to be larger than the length of the laser in space transmission, the optical fiber beam splitter 504 divides the filtered laser into two paths, and the splitting ratio is adjustable, and the splitting ratio can be usually 95: 5.
The frequency-locking feedback system 602 can realize the judgment and accurate feedback locking of the relative position of the absolute optical frequency of the comb teeth of the optical frequency comb source 100 with respect to the filter windows of the first optical fiber dense wavelength division optical filter 501 and the second optical fiber dense wavelength division optical filter 502.
In the embodiment, the optical frequency comb source is used for generating phase-locked dual-wavelength laser, so that the frequency interval and the absolute optical frequency are easy to control; the transmission grating pair 507 and any programmable optical filter reflector 508 form a filter combination to complete the filtering of two comb tooth carriers with positive/negative opposite single side bands, the band-pass morphology, the bandwidth and the center frequency can be adjusted at will, and the practical range is wide; the phase-intensity conversion is completed through beam combination beat frequency, and the device has the advantages of large bandwidth, strong practicability and simple structure; meanwhile, the optical frequency comb teeth and the filter are locked by using a frequency locking feedback technology, the suppression optimization of three-order stray signals can be effectively realized, the method does not need additional light source reference, the structure is simple, the real-time feedback technology is mature, the large dynamic range modulation-demodulation transmission of high-frequency broadband radio-frequency signals can be realized, and the application in the fields of communication, radar, electronic warfare and the like can be met.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "outer", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "rotated," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The demodulation model device is characterized by comprising an optical frequency comb source, an optical amplification module, a phase modulation module, a radio frequency source module, an optical filtering module, a frequency locking control module and a photoelectric detection module, wherein the optical frequency comb source is connected with an optical input port of the phase modulation module after passing through the optical amplification module, a radio frequency signal output by the radio frequency source module is connected with a radio frequency input port of the phase modulation module, and an optical signal output by the phase modulation module is divided into two paths after being processed by the optical filtering module: the first path is connected with the frequency locking control module to generate a feedback signal and output the feedback signal to the optical frequency comb source, and the absolute comb tooth frequency of the optical frequency comb source is controlled and adjusted; the second path is connected with the photoelectric detection module to generate a radio frequency signal and output the radio frequency signal.
2. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the optical frequency comb source is implemented based on any one or more of microcavity technology, quantum dot mode locking technology, and electrical cascade modulation technology, and has locked comb tooth spacing and stable optical power.
3. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the optical amplification module is an optical fiber amplifier or a space solid optical amplifier, and the output power and the noise figure of the optical amplification module are adjustable.
4. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the phase modulation module comprises a phase modulator and a transmission fiber, the phase modulator is connected to the rf source module, and the transmission fiber is connected to the optical filtering module.
5. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the rf source module comprises an rf power divider, and the rf power divider is connected to a first rf signal and a second rf signal with similar frequencies.
6. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the optical filtering module comprises a first optical fiber dense wavelength division optical filter and a second optical fiber dense wavelength division optical filter; the rear ends of the two optical filters are connected with an optical fiber beam combiner and an optical fiber beam splitter.
7. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the optical filtering module comprises a fiber collimator, a mirror, a transmission grating pair, an arbitrary programmable optical filtering mirror and a fiber beam splitter, which are sequentially arranged.
8. The phase modulation-based large dynamic signal demodulation model device according to claim 1, wherein the frequency locking control module comprises a photodetector and a frequency locking feedback system, which are sequentially arranged.
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