CN116707650B - Replication frequency shift system of broadband transient signal and implementation method thereof - Google Patents
Replication frequency shift system of broadband transient signal and implementation method thereof Download PDFInfo
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- A—HUMAN NECESSITIES
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
- A61B5/0261—Measuring blood flow using optical means, e.g. infrared light
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/026—Measuring blood flow
- A61B5/029—Measuring or recording blood output from the heart, e.g. minute volume
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Abstract
The invention discloses a copying frequency shift system of broadband transient signals and a realization method thereof, wherein the copying frequency shift system comprises a signal preprocessing unit, a multichannel electro-optic phase conversion unit, an optical signal processing unit and a multichannel photoelectric synthesis conversion unit. The invention can copy and shift frequency of single broadband transient signals, obviously improves the sensing capability of the existing photon sensing system on abnormal changes of the hemodynamic parameters of the heart and the blood vessels, has the advantages of large bandwidth, high signal-to-noise ratio, high response speed, high fidelity and the like, and has important application value for interception and measurement of broadband transient signals in the fields of biomedical sensing and the like.
Description
Technical Field
The invention belongs to the technical field of broadband radio frequency signal receiving and processing, and particularly relates to a broadband transient signal copying and frequency shifting system and an implementation method thereof.
Background
Biomedical engineering adopts radio frequency photon sensing technology to monitor hemodynamic parameters of human heart and blood vessel with high precision. The radio frequency photon sensing technology has the advantages of high sensitivity, good stability, high resolution, good biological safety, low system complexity, no electromagnetic interference and the like, and can meet the requirements of high-precision and safe monitoring of human body parameters in various clinical environments, particularly in Intensive Care (ICU), nuclear Magnetic Resonance (MRI) and the like.
In the radio frequency photon sensing equipment, a radio frequency signal is modulated onto a light wave, the hemodynamic parameters of the heart and the blood vessel of a human body are sensed by a high-precision optical sensing unit, the parameters are mapped onto physical quantities such as amplitude, frequency, phase and the like of the modulated optical signal, finally the modulated optical signal is converted back into the radio frequency signal by a photoelectric detector, and the characteristics of the radio frequency signal are processed and extracted by a signal processing unit, so that the parameters to be measured of the human body are obtained. Because of the limitation of high-speed acquisition and real-time processing capacity, the existing signal processing unit is difficult to capture and measure a single broadband transient signal which is abnormal, and only can process a radio frequency signal with a certain time stability, so that abnormal changes of blood flow dynamics parameters of the heart and blood vessels which occur accidentally cannot be perceived, and clinical accurate diagnosis and timely processing are affected. In order to measure a single wideband transient signal, the transient signal must be duplicated and frequency shifted prior to signal acquisition and processing, ensuring that a pulse signal sequence of a fixed period is generated in the time domain, while doppler frequency shifting is performed in the frequency domain to compensate for blood flow velocity variations.
Therefore, the invention provides a system for copying and frequency-shifting broadband transient signals and an implementation method thereof, so as to at least solve the technical problems.
Disclosure of Invention
The invention aims to solve the technical problems that: a system for copying and frequency-shifting broadband transient signals and its implementation method are provided to solve at least some of the above technical problems.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the system comprises a signal preprocessing unit, a multichannel electro-optic phase conversion unit, an optical signal processing unit and a multichannel photoelectric synthesis conversion unit, wherein the signal preprocessing unit comprises a transient signal input end, a frequency shift signal input end, an in-phase radio frequency signal output end and a quadrature radio frequency signal output end which correspond to the transient signal input end, and an in-phase frequency shift signal output end and a quadrature frequency shift signal output end which correspond to the frequency shift signal input end, the in-phase radio frequency signal output end, the quadrature radio frequency signal output end, the in-phase frequency shift signal output end and the quadrature frequency shift signal output end are connected to the multichannel electro-optic phase conversion unit, four-way phase modulation optical signal output ends of the multichannel electro-optic phase conversion unit are connected to the optical signal processing unit, and two-way copy optical signal output ends and two-way amplification optical signal output ends of the optical signal processing unit are connected to the multichannel photoelectric synthesis conversion unit.
Further, the signal preprocessing unit comprises a quadrature coupler 1 and a quadrature coupler 2, wherein the quadrature coupler 1 is used for receiving transient signals, and the quadrature coupler 2 is used for receiving frequency shift signals;
the transient signal is a pulse signal, the frequencies and pulse widths of the in-phase radio frequency signal, the quadrature radio frequency signal and the transient signal are the same, and the phase difference between the in-phase radio frequency signal and the quadrature radio frequency signal is 90 degrees; the frequency shift signal is a continuous wave signal, and the phase difference between the in-phase frequency shift signal and the quadrature frequency shift signal is 90 degrees.
Further, the multi-channel electro-optic phase conversion unit comprises a laser, a 1×4 optical coupler connected with the laser, and an optical phase modulator 1, an optical phase modulator 2, an optical phase modulator 3 and an optical phase modulator 4 connected with the 1×4 optical coupler, wherein the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4 are respectively connected with an in-phase radio frequency signal output end, a quadrature radio frequency signal output end, an in-phase shift frequency signal output end and a quadrature shift frequency signal output end.
Further, the optical signal processing unit includes an optical fiber reproduction loop 1, an optical fiber reproduction loop 2, an optical amplifier 3, and an optical amplifier 4, which are connected one-to-one with the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3, and the optical phase modulator 4, respectively;
the optical fiber replication loop 1 includes a 2×2 optical coupler 1, an optical amplifier 1 connected to the 2×2 optical coupler 1, an optical delay line 1 connected to the optical amplifier 1, and an adjustable optical attenuator 1 connected to the optical delay line 1 and connected to the 2×2 optical coupler 1; the optical fiber replication loop 2 includes a 2×2 optical coupler 2, an optical amplifier 2 connected to the 2×2 optical coupler 2, an optical delay line 2 connected to the optical amplifier 2, and an adjustable optical attenuator 2 connected to the optical delay line 2 and connected to the 2×2 optical coupler 2.
Further, the multi-channel photoelectric composite conversion unit includes a 2×2 optical switch, an adjustable optical attenuator 3, an adjustable optical attenuator 6, an adjustable optical attenuator 4 and an adjustable optical attenuator 5 connected to the 2×2 optical switch, a 1×2 optical coupler 1 connected to the adjustable optical attenuator 3 and the adjustable optical attenuator 4, a 1×2 optical coupler 2 connected to the adjustable optical attenuator 5 and the adjustable optical attenuator 6, and a balanced photodetector connected to the 1×2 optical couplers 1 and 1×2 optical coupler 2.
The invention also provides a realization method of the copying frequency shift system of the broadband transient signal, the method is that a signal preprocessing unit inputs a transient signal and a frequency shift signal at the same time, the signal preprocessing unit outputs an in-phase radio frequency signal and a quadrature radio frequency signal to a multi-channel electro-optic phase conversion unit based on the transient signal, and the signal preprocessing unit outputs the same phase shift signal and the quadrature frequency shift signal to the multi-channel electro-optic phase conversion unit based on the frequency shift signal; the multichannel electro-optic phase conversion unit outputs a phase-modulated optical signal 1, a phase-modulated optical signal 2, a phase-modulated optical signal 3 and a phase-modulated optical signal 4 and inputs the signals to the optical signal processing unit; the optical signal processing unit outputs a copy optical signal 1, a copy optical signal 2, an amplified optical signal 1 and an amplified optical signal 2 after processing; the duplicated optical signal 1, the duplicated optical signal 2, the amplified optical signal 1 and the amplified optical signal 2 finally obtain output signals through a multichannel photoelectric synthesis conversion unit.
Further, the laser emits one path of laser, the laser is divided into four paths of light waves with equal power through a 1×4 optical coupler, and the four paths of light waves are respectively input into the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4; the in-phase radio frequency signal, the quadrature radio frequency signal, the in-phase shift frequency signal and the quadrature shift frequency signal carry out parallel phase modulation on four light waves from the same laser, and the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4 respectively output a phase modulation optical signal 1, a phase modulation optical signal 2, a phase modulation optical signal 3 and a phase modulation optical signal 4.
Further, the phase modulation optical signal 1 is input into the 2×2 optical coupler 1, two paths of optical signals are output by the 2×2 optical coupler 1, one path of optical signals is directly output, the other path of optical signals is input into the 2×2 optical coupler 1 through the optical amplifier 1, the optical delay line 1 and the adjustable optical attenuator 1, the copy optical signal 1 is obtained repeatedly, the copy optical signal 1 is a phase modulation optical pulse signal sequence with a fixed period T, and each phase modulation optical pulse signal in the sequence carries the same-phase radio frequency signal;
the phase modulation optical signal 2 is input into the 2 x 2 optical coupler 2, two paths of optical signals are output by the 2 x 2 optical coupler 2, one path of optical signals are directly output, the other path of optical signals are input into the 2 x 2 optical coupler 2 through the optical amplifier 2, the optical delay line 2 and the adjustable optical attenuator 2, the optical signals are repeatedly and finally obtained, the optical signals are copied into a phase modulation optical pulse signal sequence with a fixed period T, and each phase modulation optical pulse signal in the sequence carries the orthogonal radio frequency signals;
the phase-modulated optical signal 3 is input into the optical amplifier 3, the optical amplifier 3 outputs an amplified optical signal 1, and the amplified optical signal 1 carries the same phase-shifted frequency signal; the phase modulated optical signal 4 is input to the optical amplifier 4, the optical amplifier 4 outputs the amplified optical signal 2, and the amplified optical signal 2 carries the quadrature frequency-shifted signal.
Further, the replica optical signal 1 and the replica optical signal 2 are respectively input into the variable optical attenuator 3 and the variable optical attenuator 6, and the amplified optical signal 1 and the amplified optical signal 2 are input into the 2×2 optical switch; under the switching allocation of a 2×2 optical switch, the amplified optical signal 1 is input to the adjustable optical attenuator 4, the amplified optical signal 2 is input to the adjustable optical attenuator 5, the replica optical signal 1 and the amplified optical signal 1 are input to the 1×2 optical coupler 1, the 1×2 optical coupler 1 outputs a composite optical signal 1, the replica optical signal 2 and the amplified optical signal 2 are input to the 1×2 optical coupler 2, and the 1×2 optical coupler 1 outputs a composite optical signal 2; the synthesized optical signal 1 and the synthesized optical signal 2 pass through a balance optical detector, and the balance optical detector outputs a copy frequency shift signal;
the useful optical power of the combined optical signal 1, which is the combination of the replica optical signal 1 and the amplified optical signal 1, and the useful optical power of the combined optical signal 2, which is the combination of the replica optical signal 2 and the amplified optical signal 2, are respectivelyAnd->；
；
；
In the method, in the process of the invention,and->First power coefficients of the composite optical signal 1 and the composite optical signal 2, respectively, +.>Is a first order Bessel function, +.>And->Modulation index of transient signal and frequency-shifted signal, respectively,/->Is the frequency of the transient signal, +.>For shifting the frequency of the frequency signal, < >>Is time.
Further, the replica optical signal 1 and the replica optical signal 2 are respectively input into the variable optical attenuator 3 and the variable optical attenuator 6, and the amplified optical signal 1 and the amplified optical signal 2 are input into the 2×2 optical switch; under the switching allocation of a 2×2 optical switch, the amplified optical signal 2 is input to the adjustable optical attenuator 4, the amplified optical signal 1 is input to the adjustable optical attenuator 5, the replica optical signal 1 and the amplified optical signal 2 are input to the 1×2 optical coupler 1, the 1×2 optical coupler 1 outputs a composite optical signal 1, the replica optical signal 2 and the amplified optical signal 1 are input to the 1×2 optical coupler 2, and the 1×2 optical coupler 1 outputs a composite optical signal 2; the synthesized optical signal 1 and the synthesized optical signal 2 pass through a balance optical detector, and the balance optical detector outputs a copy frequency shift signal;
the useful optical power of the composite optical signal 1 composed of the replica optical signal 1 and the amplified optical signal 2, and the useful optical power of the composite optical signal 2 composed of the replica optical signal 2 and the amplified optical signal 1 are respectivelyAnd->；
；
；
In the method, in the process of the invention,and->Second power coefficients of the composite optical signal 1 and the composite optical signal 2, respectively, +.>Is a first order Bessel function, +.>And->Modulation index of transient signal and frequency-shifted signal, respectively,/->Is the frequency of the transient signal, +.>For shifting the frequency of the frequency signal, < >>Is time.
Compared with the prior art, the invention has the following beneficial effects:
the invention modulates transient signals and frequency shift signals onto the phase of light waves, adopts optical technology to process multipath phase modulation light signals, and finally obtains the copy frequency shift signals with fixed period through photoelectric synthesis conversion. The invention can copy and shift frequency of single broadband transient signals, obviously improves the sensing capability of the existing photon sensing system on abnormal changes of the hemodynamic parameters of the heart and the blood vessels, has the advantages of large bandwidth, high signal-to-noise ratio, high response speed, high fidelity and the like, and has important application value for interception and measurement of broadband transient signals in the fields of biomedical sensing and the like.
Drawings
Fig. 1 is a block diagram of a general implementation of a replica frequency-shifting system for wideband transient signals.
Fig. 2 is a block diagram of an implementation of a signal preprocessing unit.
Fig. 3 is a block diagram of an implementation of a multi-channel electro-optic phase conversion unit.
Fig. 4 is a block diagram of an implementation of an optical signal processing unit.
Fig. 5 is a block diagram of an implementation of a multichannel photoelectric synthesis conversion unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a block diagram of a general implementation of a copy frequency shift system of a broadband transient signal, including a signal preprocessing unit, a multi-channel electro-optic phase conversion unit, an optical signal processing unit and a multi-channel photoelectric synthesis conversion unit, where the signal preprocessing unit includes a transient signal input end, a frequency shift signal input end, an in-phase radio frequency signal output end and a quadrature radio frequency signal output end corresponding to the transient signal input end, and an in-phase frequency shift signal output end and a quadrature frequency shift signal output end corresponding to the frequency shift signal input end, the in-phase radio frequency signal output end, the quadrature radio frequency signal output end, the in-phase frequency shift signal output end, the quadrature frequency shift signal output end are connected to the multi-channel electro-optic phase conversion unit, four-way phase modulation optical signal output ends of the multi-channel electro-optic phase conversion unit are connected to the optical signal processing unit, and two-way copy optical signal output ends and two-way amplification optical signal output ends of the optical signal processing unit are connected to the multi-channel photoelectric synthesis conversion unit.
The signal preprocessing unit preprocesses transient signals into in-phase radio frequency signals and quadrature radio frequency signals, preprocesses frequency shift signals into same-phase frequency shift signals and quadrature frequency shift signals, the multichannel electro-optic phase conversion unit maps the in-phase signals and the quadrature signals onto phases of four phase modulation optical signals, the optical signal processing unit circularly copies and amplifies the phase modulation optical signals, and the multichannel electro-optic synthesis conversion unit obtains output signals to realize photoelectric conversion of the copy signals and positive frequency or negative frequency shift. The invention has the advantages of high performance, simple structure and the like, and has important application value for capturing and measuring broadband transient signals in the fields of biomedical sensing and the like.
Fig. 2 is an implementation block diagram of a signal preprocessing unit, where the signal preprocessing unit includes a quadrature coupler 1 and a quadrature coupler 2, where the quadrature coupler 1 is used for receiving transient signals, and the quadrature coupler 2 is used for receiving frequency-shifted signals. The input end of the quadrature coupler 1 is the transient signal input end, and two output ends of the quadrature coupler 1 are the in-phase radio frequency signal output end and the quadrature radio frequency signal output end respectively; the input end of the quadrature coupler 2 is the frequency shift signal input end, and two output ends of the quadrature coupler 2 are the in-phase frequency shift signal output end and the quadrature frequency shift signal output end respectively. The quadrature coupler 1 inputs a transient signal from a transient signal input endThe state signal is respectively output by an in-phase radio frequency signal output end and a quadrature radio frequency signal output end, meanwhile, the quadrature coupler 2 is respectively input by a frequency shift signal input end, and respectively outputs a same phase shift signal and a quadrature frequency shift signal by a same phase shift signal output end and a quadrature frequency shift signal output end. The transient signal is a pulse signal with the frequency ofPulse width ofThe frequency and pulse width of the in-phase radio frequency signal, the quadrature radio frequency signal and the transient signal are the same, and the phase difference of the in-phase radio frequency signal and the quadrature radio frequency signal is 90 degrees; the frequency shift signal is a continuous wave signal with a frequency of +.>The phase difference between the in-phase shift signal and the quadrature shift signal is 90 °.
Fig. 3 is a block diagram of an implementation of a multi-channel electro-optic phase conversion unit, where the multi-channel electro-optic phase conversion unit includes a laser, a 1×4 optical coupler connected to the laser, and an optical phase modulator 1, an optical phase modulator 2, an optical phase modulator 3, and an optical phase modulator 4 connected to the 1×4 optical coupler, where the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3, and the optical phase modulator 4 are respectively connected to an in-phase radio frequency signal output terminal, a quadrature radio frequency signal output terminal, an in-phase shift frequency signal output terminal, and a quadrature shift frequency signal output terminal.
The laser emits one path of laser, the laser is divided into four paths of light waves with equal power through a 1×4 optical coupler, the four paths of light waves are respectively input into an optical phase modulator 1, an optical phase modulator 2, an optical phase modulator 3 and an optical phase modulator 4, meanwhile, an in-phase radio frequency signal is input into the optical phase modulator 1, a quadrature radio frequency signal is input into the optical phase modulator 2, an in-phase shift frequency signal is input into the optical phase modulator 3, and a quadrature shift frequency signal is input into the optical phase modulator 4; the optical phase modulator 1 outputs a phase-modulated optical signal 1, the optical phase modulator 2 outputs a phase-modulated optical signal 2, the optical phase modulator 3 outputs a phase-modulated optical signal 3, and the optical phase modulator 4 outputs a phase-modulated optical signal 4. The process is that the in-phase radio frequency signal, the quadrature radio frequency signal, the in-phase frequency shift signal and the quadrature frequency shift signal carry out parallel phase modulation on four paths of light waves from the same path of laser branching.
Fig. 4 is an implementation block diagram of an optical signal processing unit including an optical fiber replication loop 1, an optical fiber replication loop 2, an optical amplifier 3, and an optical amplifier 4, which are connected one-to-one with an optical phase modulator 1, an optical phase modulator 2, an optical phase modulator 3, and an optical phase modulator 4, respectively;
the optical fiber replication loop 1 includes a 2×2 optical coupler 1, an optical amplifier 1 connected to the 2×2 optical coupler 1, an optical delay line 1 connected to the optical amplifier 1, and an adjustable optical attenuator 1 connected to the optical delay line 1 and connected to the 2×2 optical coupler 1; the optical fiber replication loop 2 includes a 2×2 optical coupler 2, an optical amplifier 2 connected to the 2×2 optical coupler 2, an optical delay line 2 connected to the optical amplifier 2, and an adjustable optical attenuator 2 connected to the optical delay line 2 and connected to the 2×2 optical coupler 2. The input terminals of the 2×2 optical couplers 1,2×2 optical couplers 2, optical amplifiers 3, and 4 are connected to the output terminals of the optical phase modulators 1,2, 3, and 4, respectively.
The delay time of the optical delay line 1 is that the optical fiber replication loop 1 is prevented from generating self-oscillation by the adjustable optical attenuator 1; the delay time of the optical delay line 2 is the same, and the self-oscillation generated by the optical fiber replication loop 2 is avoided through the adjustable optical attenuator 2.
The phase modulation optical signal 1 is input into the 2 x 2 optical coupler 1, two paths of optical signals are output by the 2 x 2 optical coupler 1, one path of optical signals are directly output, the other path of optical signals are input into the 2 x 2 optical coupler 1 through the optical delay line 1 and the adjustable optical attenuator 1, two paths of optical signals are output by the 2 x 2 optical coupler 1, one path of optical signals are directly output, the other path of optical signals are input into the 2 x 2 optical coupler 1 through the optical amplifier 1, the optical delay line 1 and the adjustable optical attenuator 1, the copy optical signal 1 is obtained repeatedly and finally, the copy optical signal 1 is a phase modulation optical pulse signal sequence with a fixed period T, and each phase modulation optical pulse signal in the sequence carries the in-phase radio frequency signal;
the phase modulation optical signal 2 is input into the 2 x 2 optical coupler 2, two paths of optical signals are output by the 2 x 2 optical coupler 2, one path of optical signals are directly output, the other path of optical signals are input into the 2 x 2 optical coupler 2 through the optical amplifier 2, the optical delay line 2 and the adjustable optical attenuator 2, the optical signals are repeatedly and finally obtained, the optical signals are copied into a phase modulation optical pulse signal sequence with a fixed period T, and each phase modulation optical pulse signal in the sequence carries the orthogonal radio frequency signals;
the phase-modulated optical signal 3 is input into the optical amplifier 3, the optical amplifier 3 outputs an amplified optical signal 1, and the amplified optical signal 1 carries the same phase-shifted frequency signal; the phase modulated optical signal 4 is input to the optical amplifier 4, the optical amplifier 4 outputs the amplified optical signal 2, and the amplified optical signal 2 carries the quadrature frequency-shifted signal.
In order to ensure that adjacent phase modulated light pulses in the replica optical signal 1 and the replica optical signal 2 do not overlap in time, the following conditions need to be met:，/>delay time for optical delay line 1 and optical delay line 2, +.>Is the pulse width of the transient signal.
Fig. 5 is an implementation block diagram of a multi-channel photoelectric composite conversion unit including a 2×2 optical switch, an adjustable optical attenuator 3, an adjustable optical attenuator 6, an adjustable optical attenuator 4 and an adjustable optical attenuator 5 connected to the 2×2 optical switch, a 1×2 optical coupler 1 connected to the adjustable optical attenuator 3 and the adjustable optical attenuator 4, a 1×2 optical coupler 2 connected to the adjustable optical attenuator 5 and the adjustable optical attenuator 6, and a balanced photodetector connected to the 1×2 optical couplers 1 and 1×2 optical coupler 2.
The replica optical signal 1 and the replica optical signal 2 are respectively input into the adjustable optical attenuator 3 and the adjustable optical attenuator 6, and the amplified optical signal 1 and the amplified optical signal 2 are input into the 2×2 optical switch; with 2×2 optical switch switching distribution, the amplified optical signal 1 is input to the variable optical attenuator 4 or the variable optical attenuator 5, when the amplified optical signal 1 is input to the variable optical attenuator 4, the amplified optical signal 2 is input to the variable optical attenuator 5, and when the amplified optical signal 1 is input to the variable optical attenuator 5, the amplified optical signal 2 is input to the variable optical attenuator 4. And synthesizing different duplicated optical signals and amplified optical signals through a 2X 2 optical switch, and finally obtaining different output signals. The variable optical attenuator 3, the variable optical attenuator 4, the variable optical attenuator 5, and the variable optical attenuator 6 can equalize the power of the combined optical signal 1 and the combined optical signal 2. The replica frequency-shifted signal is formed by a fixed periodThe time domain characteristics of each pulse signal and the transient signal are identical, and the pulse width of each pulse signal and the transient signal are identical and are ∈>。
In one embodiment, the amplified optical signal 1 is input to the variable optical attenuator 4, the amplified optical signal 2 is input to the variable optical attenuator 5, the replica optical signal 1 and the amplified optical signal 1 are input to the 1×2 optical coupler 1, the 1×2 optical coupler 1 outputs the composite optical signal 1, the replica optical signal 2 and the amplified optical signal 2 are input to the 1×2 optical coupler 2, and the 1×2 optical coupler 2 outputs the composite optical signal 2; the synthesized optical signal 1 and the synthesized optical signal 2 pass through a balanced optical detector, and the output signal of the balanced optical detector is a copy frequency shift signal.
At this time, the useful optical powers of the composite optical signal 1, in which the replica optical signal 1 and the amplified optical signal 1 are combined, and the composite optical signal 2, in which the replica optical signal 2 and the amplified optical signal 2 are combined, are respectivelyAnd->，/>And->All are time->Is a function of:
；
；
in the method, in the process of the invention,and->First power coefficients of the composite optical signal 1 and the composite optical signal 2, respectively, +.>Is a first order Bessel function, +.>And->Modulation index of transient signal and frequency-shifted signal, respectively,/->Is the frequency of the transient signal, +.>For shifting the frequency of the frequency signal, < >>Is time. By adjusting the adjustable optical attenuator 3, the adjustable optical attenuator 4, the adjustable optical attenuator 5 and the adjustable optical attenuator6, can make->And->Equal. In this embodiment, the composite optical signal 1 and the composite optical signal 2 are input into a balanced photodetector, and the resulting replica frequency-shifted signal is output at a frequency equal to the frequency of the transient signal plus the frequency of the frequency-shifted signal, i.e.)>。
In another embodiment, the replica optical signal 1 and the replica optical signal 2 are respectively input into the adjustable optical attenuator 3 and the adjustable optical attenuator 6, and the amplified optical signal 1 and the amplified optical signal 2 are input into the 2×2 optical switch; under the switching allocation of a 2×2 optical switch, the amplified optical signal 2 is input to the adjustable optical attenuator 4, the amplified optical signal 1 is input to the adjustable optical attenuator 5, the replica optical signal 1 and the amplified optical signal 2 are input to the 1×2 optical coupler 1, the 1×2 optical coupler 1 outputs a composite optical signal 1, the replica optical signal 2 and the amplified optical signal 1 are input to the 1×2 optical coupler 2, and the 1×2 optical coupler 2 outputs a composite optical signal 2; the synthesized optical signal 1 and the synthesized optical signal 2 pass through a balanced optical detector, and the output signal of the balanced optical detector is a copy frequency shift signal;
at this time, the useful optical power of the composite optical signal 1 composed of the replica optical signal 1 and the amplified optical signal 2, and the useful optical power of the composite optical signal 2 composed of the replica optical signal 2 and the amplified optical signal 1 are respectivelyAnd->，/>And->All are time->Is a function of:
；
；
in the method, in the process of the invention,and->Second power coefficients of the composite optical signal 1 and the composite optical signal 2, respectively, +.>Is a first order Bessel function, +.>And->Modulation index of transient signal and frequency-shifted signal, respectively,/->Is the frequency of the transient signal, +.>For shifting the frequency of the frequency signal, < >>Is time. By adjusting the adjustable optical attenuator 3, the adjustable optical attenuator 4, the adjustable optical attenuator 5 and the adjustable optical attenuator 6, it is possible to make +.>And->Equal. In this embodiment, the composite optical signal 1 and the composite optical signal 2 are input to a balanced photodetector, and the resulting replica frequency-shifted signal is output at a frequencyFor subtracting the frequency of the frequency-shifted signal from the frequency of the transient signal, i.e. +.>。
Finally, it should be noted that: the above embodiments are merely preferred embodiments of the present invention for illustrating the technical solution of the present invention, but not limiting the scope of the present invention; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions; that is, even though the main design concept and spirit of the present invention is modified or finished in an insubstantial manner, the technical problem solved by the present invention is still consistent with the present invention, and all the technical problems are included in the protection scope of the present invention; in addition, the technical scheme of the invention is directly or indirectly applied to other related technical fields, and the technical scheme is included in the scope of the invention.
Claims (6)
1. The system is characterized by comprising a signal preprocessing unit, a multichannel electro-optic phase conversion unit, an optical signal processing unit and a multichannel photoelectric synthesis conversion unit, wherein the signal preprocessing unit comprises a transient signal input end, a frequency-shift signal input end, an in-phase radio frequency signal output end and a quadrature radio frequency signal output end which correspond to the transient signal input end, and an in-phase frequency-shift signal output end and a quadrature frequency-shift signal output end which correspond to the frequency-shift signal input end, the in-phase radio frequency signal output end, the quadrature radio frequency signal output end, the in-phase frequency-shift signal output end and the quadrature frequency-shift signal output end are connected to the multichannel electro-optic phase conversion unit, four-way phase-modulation optical signal output ends of the multichannel electro-optic phase conversion unit are connected to the optical signal processing unit, and two-way copy optical signal output ends and two-way amplification optical signal output ends of the optical signal processing unit are connected to the multichannel photoelectric synthesis conversion unit;
the signal preprocessing unit comprises a quadrature coupler 1 and a quadrature coupler 2, wherein the quadrature coupler 1 is used for receiving transient signals, and the quadrature coupler 2 is used for receiving frequency shift signals;
the transient signal is a pulse signal, the frequencies and pulse widths of the in-phase radio frequency signal, the quadrature radio frequency signal and the transient signal are the same, and the phase difference between the in-phase radio frequency signal and the quadrature radio frequency signal is 90 degrees; the frequency shift signal is a continuous wave signal, and the phase difference between the in-phase frequency shift signal and the quadrature frequency shift signal is 90 degrees;
the multichannel electro-optic phase conversion unit comprises a laser, a 1 multiplied by 4 optical coupler connected with the laser, and an optical phase modulator 1, an optical phase modulator 2, an optical phase modulator 3 and an optical phase modulator 4 connected with the 1 multiplied by 4 optical coupler, wherein the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4 are respectively connected with an in-phase radio frequency signal output end, a quadrature radio frequency signal output end, an in-phase shift frequency signal output end and a quadrature shift frequency signal output end;
the optical signal processing unit comprises an optical fiber replication loop 1, an optical fiber replication loop 2, an optical amplifier 3 and an optical amplifier 4 which are respectively connected with the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4 in one-to-one mode;
the optical fiber replication loop 1 includes a 2×2 optical coupler 1, an optical amplifier 1 connected to the 2×2 optical coupler 1, an optical delay line 1 connected to the optical amplifier 1, and an adjustable optical attenuator 1 connected to the optical delay line 1 and connected to the 2×2 optical coupler 1; the optical fiber replication loop 2 includes a 2×2 optical coupler 2, an optical amplifier 2 connected to the 2×2 optical coupler 2, an optical delay line 2 connected to the optical amplifier 2, and an adjustable optical attenuator 2 connected to the optical delay line 2 and connected to the 2×2 optical coupler 2;
the multi-channel photoelectric composite conversion unit comprises a 2×2 optical switch, an adjustable optical attenuator 3, an adjustable optical attenuator 6, an adjustable optical attenuator 4 and an adjustable optical attenuator 5 connected with the 2×2 optical switch, a 1×2 optical coupler 1 connected with the adjustable optical attenuator 3 and the adjustable optical attenuator 4, a 1×2 optical coupler 2 connected with the adjustable optical attenuator 5 and the adjustable optical attenuator 6, and a balanced photodetector connected with the 1×2 optical coupler 1 and the 1×2 optical coupler 2.
2. The method for implementing a system for copying and shifting a broadband transient signal according to claim 1, wherein the signal preprocessing unit inputs a transient signal and a frequency-shifted signal at the same time, the signal preprocessing unit outputs an in-phase radio frequency signal and a quadrature radio frequency signal to the multi-channel electro-optic phase conversion unit based on the transient signal, and the signal preprocessing unit outputs the same-phase frequency-shifted signal and the quadrature frequency-shifted signal to the multi-channel electro-optic phase conversion unit based on the frequency-shifted signal; the multichannel electro-optic phase conversion unit outputs a phase-modulated optical signal 1, a phase-modulated optical signal 2, a phase-modulated optical signal 3 and a phase-modulated optical signal 4 and inputs the signals to the optical signal processing unit; the optical signal processing unit outputs a copy optical signal 1, a copy optical signal 2, an amplified optical signal 1 and an amplified optical signal 2 after processing; the duplicated optical signal 1, the duplicated optical signal 2, the amplified optical signal 1 and the amplified optical signal 2 finally obtain output signals through a multichannel photoelectric synthesis conversion unit.
3. The method for implementing a system for copying and frequency-shifting a broadband transient signal according to claim 2, wherein the laser emits a path of laser light, and the laser light is divided into four paths of optical waves with equal power through a 1×4 optical coupler, and the four paths of optical waves are respectively input into the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4; the in-phase radio frequency signal, the quadrature radio frequency signal, the in-phase shift frequency signal and the quadrature shift frequency signal carry out parallel phase modulation on four light waves from the same laser, and the optical phase modulator 1, the optical phase modulator 2, the optical phase modulator 3 and the optical phase modulator 4 respectively output a phase modulation optical signal 1, a phase modulation optical signal 2, a phase modulation optical signal 3 and a phase modulation optical signal 4.
4. The method for implementing a copy frequency shift system of broadband transient signals according to claim 3, wherein the phase modulation optical signal 1 is input into the 2×2 optical coupler 1, two paths of optical signals are output from the 2×2 optical coupler 1, one path of optical signals is directly output, the other path of optical signals is input into the 2×2 optical coupler 1 through the optical amplifier 1, the optical delay line 1 and the adjustable optical attenuator 1, the copy optical signal 1 is obtained repeatedly, the copy optical signal 1 is a phase modulation optical pulse signal sequence with a fixed period T, and each phase modulation optical pulse signal in the sequence carries the in-phase radio frequency signal;
the phase modulation optical signal 2 is input into the 2 x 2 optical coupler 2, two paths of optical signals are output by the 2 x 2 optical coupler 2, one path of optical signals are directly output, the other path of optical signals are input into the 2 x 2 optical coupler 2 through the optical amplifier 2, the optical delay line 2 and the adjustable optical attenuator 2, the optical signals are repeatedly and finally obtained, the optical signals are copied into a phase modulation optical pulse signal sequence with a fixed period T, and each phase modulation optical pulse signal in the sequence carries the orthogonal radio frequency signals;
the phase-modulated optical signal 3 is input into the optical amplifier 3, the optical amplifier 3 outputs an amplified optical signal 1, and the amplified optical signal 1 carries the same phase-shifted frequency signal; the phase modulated optical signal 4 is input to the optical amplifier 4, the optical amplifier 4 outputs the amplified optical signal 2, and the amplified optical signal 2 carries the quadrature frequency-shifted signal.
5. The method for implementing a frequency shift system for copying a wideband transient signal according to claim 4, wherein the copied optical signal 1 and the copied optical signal 2 are respectively input to the adjustable optical attenuator 3 and the adjustable optical attenuator 6, and the amplified optical signal 1 and the amplified optical signal 2 are input to the 2 x 2 optical switch; under the switching allocation of a 2×2 optical switch, the amplified optical signal 1 is input to the adjustable optical attenuator 4, the amplified optical signal 2 is input to the adjustable optical attenuator 5, the replica optical signal 1 and the amplified optical signal 1 are input to the 1×2 optical coupler 1, the 1×2 optical coupler 1 outputs a composite optical signal 1, the replica optical signal 2 and the amplified optical signal 2 are input to the 1×2 optical coupler 2, and the 1×2 optical coupler 1 outputs a composite optical signal 2; the synthesized optical signal 1 and the synthesized optical signal 2 pass through a balance optical detector, and the balance optical detector outputs a copy frequency shift signal;
the useful optical power of the combined optical signal 1, which is the combination of the replica optical signal 1 and the amplified optical signal 1, and the useful optical power of the combined optical signal 2, which is the combination of the replica optical signal 2 and the amplified optical signal 2, are respectivelyAnd->；
；
；
In the method, in the process of the invention,and->First power coefficients of the composite optical signal 1 and the composite optical signal 2, respectively, +.>Is a first order Bessel function, +.>And->Modulation index of transient signal and frequency-shifted signal, respectively,/->Is the frequency of the transient signal, +.>For shifting the frequency of the frequency signal, < >>Is time.
6. The method for implementing a frequency shift system for copying a wideband transient signal according to claim 4, wherein the copied optical signal 1 and the copied optical signal 2 are respectively input to the adjustable optical attenuator 3 and the adjustable optical attenuator 6, and the amplified optical signal 1 and the amplified optical signal 2 are input to the 2 x 2 optical switch; under the switching allocation of a 2×2 optical switch, the amplified optical signal 2 is input to the adjustable optical attenuator 4, the amplified optical signal 1 is input to the adjustable optical attenuator 5, the replica optical signal 1 and the amplified optical signal 2 are input to the 1×2 optical coupler 1, the 1×2 optical coupler 1 outputs a composite optical signal 1, the replica optical signal 2 and the amplified optical signal 1 are input to the 1×2 optical coupler 2, and the 1×2 optical coupler 1 outputs a composite optical signal 2; the synthesized optical signal 1 and the synthesized optical signal 2 pass through a balance optical detector, and the balance optical detector outputs a copy frequency shift signal;
the useful optical power of the composite optical signal 1 composed of the replica optical signal 1 and the amplified optical signal 2, and the useful optical power of the composite optical signal 2 composed of the replica optical signal 2 and the amplified optical signal 1 are respectivelyAnd->；
；
；
In the method, in the process of the invention,and->Second power coefficients of the composite optical signal 1 and the composite optical signal 2, respectively, +.>Is a first order Bessel function, +.>And->Modulation index of transient signal and frequency-shifted signal, respectively,/->Is the frequency of the transient signal, +.>For shifting the frequency of the frequency signal, < >>Is time.
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