CN115632714A - Radio frequency optical fiber link for parallel output of fundamental frequency signal and frequency multiplication signal and implementation method - Google Patents
Radio frequency optical fiber link for parallel output of fundamental frequency signal and frequency multiplication signal and implementation method Download PDFInfo
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Abstract
The invention discloses a radio frequency optical fiber link for parallel output of a base frequency signal and a frequency doubling signal and an implementation method, belonging to the technical field of broadband radio frequency signal transmission and processing. The link comprises an optical signal generating unit, an optical signal distributing and synthesizing unit and a multi-channel photoelectric conversion unit; the implementation method comprises the steps that a fundamental frequency signal is input into an optical signal generating unit to obtain a modulation optical signal and a local oscillation optical signal; modulating optical signals and local oscillator optical signals are input into an optical signal distribution and synthesis unit to obtain four paths of synthesized optical signals; the four paths of synthesized optical signals are input into the multi-channel photoelectric conversion unit, and two paths of radio frequency signals, namely, a base frequency signal and a frequency multiplication signal, are output. The invention obviously expands the capability of the existing radio frequency optical fiber link to output broadband signals, the output signals have the advantages of pure frequency spectrum, low noise, good phase coherence and the like, and the invention has important application value for realizing the generation and distribution of the broadband radio frequency signals of radio frequency photon sensing and other equipment in biomedical engineering.
Description
Technical Field
The invention belongs to the technical field of broadband radio frequency signal transmission and processing, and particularly relates to a radio frequency optical fiber link for parallel output of a base frequency signal and a frequency multiplication signal and an implementation method thereof, which can be applied to radio frequency photon sensing and other equipment in biomedical engineering to realize broadband radio frequency signal generation and distribution.
Background
Biomedical engineering adopts a radio frequency photon sensing technology to carry out high-precision monitoring on parameters of human body such as pressure, temperature, pulse, respiration and the like. 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 safety monitoring on human body parameters in various clinical environments, particularly Intensive Care Unit (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 variation of parameters to be measured of a human body is sensed through a high-precision optical sensing unit, the variation of the parameters is mapped to physical quantities such as amplitude, frequency and phase of a modulated optical signal, the modulated optical signal is converted back to the radio frequency signal through a photoelectric detector, and a signal processing part processes and extracts the variation characteristic of the radio frequency signal, so that the parameters to be measured of the human body are obtained. As a key part of radio frequency photon sensing, a radio frequency optical fiber link modulates a radio frequency signal onto a light wave, utilizes an optical fiber as a transmission medium, directly transmits and distributes a modulated optical signal, and converts the optical signal into a radio frequency signal at the tail end. The radio frequency optical fiber link can realize broadband, long-distance, low-loss and electromagnetic interference-free signal transmission by utilizing the characteristics of the optical fiber. Generally, the rf optical fiber link can only transmit a single low-noise baseband signal, for example, the patent No. CN 109286442B, entitled low-noise microwave optical fiber link device and implementation method thereof. When the radio frequency photon sensing system needs coherent fundamental frequency signals and frequency multiplication signals simultaneously to improve the accuracy of parameter measurement, the traditional radio frequency optical fiber link cannot meet the requirement.
Therefore, the present invention provides a radio frequency fiber link for parallel output of fundamental frequency signals and frequency multiplication signals and a realization method thereof, so as to solve at least some technical problems.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a radio frequency optical fiber link for parallel output of fundamental frequency signals and frequency multiplication signals and an implementation method are provided to solve at least some of the technical problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the radio frequency optical fiber link circuit comprises an optical signal generating unit, an optical signal distributing and synthesizing unit and a multi-channel photoelectric conversion unit, wherein the input of the optical signal generating unit is a base frequency signal, the optical signal generating unit is provided with a local oscillator optical signal output end and a modulation optical signal output end, the local oscillator optical signal output end and the modulation optical signal output end are both connected with the optical signal distributing and synthesizing unit, the optical signal distributing and synthesizing unit is provided with a first synthesized optical signal output end, a second synthesized optical signal output end, a third synthesized optical signal output end and a fourth synthesized optical signal output end, the first synthesized optical signal output end, the second synthesized optical signal output end, the third synthesized optical signal output end and the fourth synthesized optical signal output end are all connected with the multi-channel photoelectric conversion unit, and the multi-channel photoelectric conversion unit outputs the base frequency signal and the frequency multiplication signal.
Further, the optical signal generating unit includes a laser, a 1 × 2 optical coupler and an optical modulator, the laser is connected to the 1 × 2 optical coupler, the 1 × 2 optical coupler has a first output end and a second output end, the first output end is a local oscillator optical signal output end, the second output end is connected to the optical modulator, a fundamental frequency signal is input to an input end of the optical modulator, and an output end of the optical modulator is a modulated optical signal output end and outputs a modulated optical signal.
Further, the optical signal distribution and synthesis unit includes a 90 ° optical hybrid coupler, and both the local oscillator optical signal output end of the 1 × 2 optical coupler and the modulated optical signal output end of the optical modulator are connected to the input end of the 90 ° optical hybrid coupler.
Further, the multi-channel photoelectric conversion unit includes a first balanced optical detector and a second balanced optical detector, the first synthesized optical signal output end and the second synthesized optical signal output end are connected to the first balanced optical detector, the first balanced optical detector outputs a fundamental frequency signal, the third synthesized optical signal output end and the fourth synthesized optical signal output end are connected to the second balanced optical detector, and the second balanced optical detector outputs a frequency-doubled signal.
Further, the optical powers of the first, second, third and fourth combined optical signals are respectively expressed as:
in the formula, A 0 The intensity of the optical electric field after power division of the laser, C m For modulating the electric field loss coefficient, C, of the optical signal L The electric field loss coefficient of the local oscillator optical signal is phi, which is the optical wave phase change caused by the fundamental frequency signal.
The method for realizing the radio frequency optical fiber link for parallelly outputting the base frequency signal and the frequency multiplication signal comprises the following steps:
step 1, inputting a fundamental frequency signal into an optical signal generating unit to obtain a modulated optical signal and a local oscillator optical signal;
step 2, inputting the modulated optical signal and the local oscillator optical signal into an optical signal distribution synthesis unit to obtain four paths of synthesized optical signals which are a first synthesized optical signal, a second synthesized optical signal, a third synthesized optical signal and a fourth synthesized optical signal respectively;
and 3, inputting the four paths of synthesized optical signals into a multi-channel photoelectric conversion unit, and outputting two paths of radio frequency signals which are respectively a base frequency signal and a frequency doubling signal.
Further, the step 1 specifically comprises: a fundamental frequency signal is input into a light modulator, and laser emitted by the laser passes through a 1 x 2 optical coupler and is divided into two paths with equal power; one path is directly output as a local oscillation optical signal, and the other path enters an optical modulator and obtains a modulated optical signal under the amplitude modulation of an input fundamental frequency signal.
Further, the step 2 specifically includes: the local oscillator optical signal and the modulated optical signal are respectively input into a 90-degree optical hybrid coupler, and four paths of synthetic optical signals, namely a first synthetic optical signal, a second synthetic optical signal, a third synthetic optical signal and a fourth synthetic optical signal, are obtained after branching, phase shifting, superposition and beat in the 90-degree optical hybrid coupler.
Further, the optical powers of the first, second, third and fourth combined optical signals are respectively expressed as:
in the formula, A 0 Intensity of the optical electric field after power division of the laser, C m For modulating the electric field loss coefficient, C, of optical signals L The electric field loss coefficient of the local oscillator optical signal is phi, which is the optical wave phase change caused by the fundamental frequency signal.
Further, the step 3 specifically includes: the first synthesized optical signal and the second synthesized optical signal are input into a first balanced optical detector for photoelectric subtraction detection, and a fundamental frequency signal is obtained through output; and inputting the third synthetic optical signal and the fourth synthetic optical signal into a second balanced optical detector for photoelectric subtraction detection, and outputting to obtain a frequency doubling signal.
Compared with the prior art, the invention has the following beneficial effects:
the invention obtains four paths of synthetic optical signals by carrying out coherent processing on laser emitted by the same laser, wherein every two of the four paths form a group, and then photoelectric subtraction detection is carried out on the two groups respectively to obtain a fundamental frequency signal and a frequency doubling signal at the same time. The method provided by the invention obviously expands the capability of the existing radio frequency fiber link for outputting the broadband signal, the output signal has the advantages of pure frequency spectrum, low noise, good phase coherence and the like, and the method has important application value in realizing the generation and distribution of the broadband radio frequency signal in equipment such as radio frequency photon sensing in biomedical engineering and the like.
Drawings
Fig. 1 is a general block diagram of a radio frequency fiber link according to the present invention.
Fig. 2 is a block diagram of an optical signal generating unit according to the present invention.
Fig. 3 is a block diagram of an optical signal distribution and synthesis unit according to the present invention.
Fig. 4 is a block diagram of a multi-channel photoelectric conversion unit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 1, a radio frequency optical fiber link for outputting a fundamental frequency signal and a frequency doubling signal in parallel includes an optical signal generating unit, an optical signal distribution and synthesis unit, and a multi-channel photoelectric conversion unit, where an input of the optical signal generating unit is a fundamental frequency signal, the optical signal generating unit has a local oscillator optical signal output end and a modulated optical signal output end, both the local oscillator optical signal output end and the modulated optical signal output end are connected to the optical signal distribution and synthesis unit, the optical signal distribution and synthesis unit has a first synthesized optical signal output end, a second synthesized optical signal output end, a third synthesized optical signal output end, and a fourth synthesized optical signal output end, all of which are connected to the multi-channel photoelectric conversion unit, and the multi-channel photoelectric conversion unit outputs a fundamental frequency signal and a frequency doubling signal.
In this embodiment, the radio frequency optical fiber link is composed of an optical signal generation unit, an optical signal distribution and synthesis unit, and a multi-channel photoelectric conversion unit. Inputting the fundamental frequency signal into an optical signal generating unit to obtain a modulated optical signal and a local oscillator optical signal; after the modulated optical signal and the local oscillator optical signal are transmitted by a distance of optical fibers, the modulated optical signal and the local oscillator optical signal enter an optical signal distribution and synthesis unit and four paths of synthesized optical signals are output; the four paths of synthesized optical signals enter a multi-channel photoelectric conversion unit, and two paths of parallel radio frequency signals are output, namely fundamental frequency signals and frequency doubling signals. In the embodiment, optical beat is utilized to generate multiple paths of optical signals through coherent processing of homologous laser, and coherent frequency multiplication signals are generated and transmitted simultaneously on the basis of fiber transmission of fundamental frequency signals.
As an embodiment, as shown in fig. 2, the optical signal generating unit includes a laser, a 1 × 2 optical coupler, and an optical modulator, where the laser is connected to the 1 × 2 optical coupler, the 1 × 2 optical coupler has a first output end and a second output end, the first output end is a local oscillator optical signal output end, the second output end is connected to the optical modulator, a fundamental frequency signal is input at an input end of the optical modulator, and an output end of the optical modulator is a modulated optical signal output end and outputs a modulated optical signal. A fundamental frequency signal is input into a light modulator, and laser emitted by the laser passes through a 1 x 2 optical coupler and is divided into two paths with equal power; one path is directly output as a local oscillation optical signal; and the other path enters an optical modulator, and a modulated optical signal is obtained under the amplitude modulation of the input fundamental frequency signal. The optical modulator is of the single-arm drive type, and the operating point of the optical modulator is set at the minimum value of optical power.
As an embodiment, as shown in fig. 3, the optical signal distribution and synthesis unit includes a 90 ° optical hybrid coupler, and the local oscillator optical signal output end of the 1 × 2 optical coupler and the modulated optical signal output end of the optical modulator are both connected to the input end of the 90 ° optical hybrid coupler. The local oscillator optical signal and the modulated optical signal are respectively input into a 90-degree optical hybrid coupler, and four paths of synthesized optical signals are obtained after branching, phase shifting, superposing and beating in the 90-degree optical hybrid coupler: a first combined optical signal, a second combined optical signal, a third combined optical signal, and a fourth combined optical signal.
As an embodiment, as shown in fig. 4, the multi-channel photoelectric conversion unit includes a first balanced photodetector and a second balanced photodetector, the first synthesized optical signal output end and the second synthesized optical signal output end are connected to the first balanced photodetector, the first balanced photodetector outputs a fundamental frequency signal, the third synthesized optical signal output end and the fourth synthesized optical signal output end are connected to the second balanced photodetector, and the second balanced photodetector outputs a frequency-doubled signal. The first synthesized optical signal and the second synthesized optical signal are input into a first balanced optical detector for photoelectric subtraction detection, and a base frequency signal is obtained through output; and inputting the third synthesized optical signal and the fourth synthesized optical signal into a second balanced optical detector for photoelectric subtraction detection, and outputting to obtain a frequency doubling signal.
The following provides a specific embodiment of the optical power calculation scheme for the first combined optical signal, the second combined optical signal, the third combined optical signal, and the fourth combined optical signal:
in the formula, A 0 Intensity of the optical electric field after power division of the laser, C m For modulating the electric field loss coefficient, C, of optical signals L The electric field loss coefficient of the local oscillator optical signal is phi, which is the optical wave phase change caused by the fundamental frequency signal. The expressions (1), (2), (3) and (4) correspond to optical power calculation expressions for the first combined optical signal, the second combined optical signal, the third combined optical signal and the fourth combined optical signal, respectively.
Example 2
The method for realizing the radio frequency optical fiber link for parallelly outputting the base frequency signal and the frequency multiplication signal comprises the following steps:
step 1, inputting a fundamental frequency signal into an optical signal generating unit to obtain a modulated optical signal and a local oscillator optical signal;
step 2, inputting the modulated optical signal and the local oscillator optical signal into an optical signal distribution synthesis unit to obtain four paths of synthesized optical signals which are a first synthesized optical signal, a second synthesized optical signal, a third synthesized optical signal and a fourth synthesized optical signal respectively;
and 3, inputting the four paths of synthesized optical signals into a multi-channel photoelectric conversion unit, and outputting two paths of radio frequency signals which are respectively a fundamental frequency signal and a frequency doubling signal.
The embodiment provides a method for simultaneously generating and converting a base frequency signal and a frequency doubling signal, wherein two balanced optical detectors respectively perform photoelectric subtraction detection on two paths of input four paths of synthesized optical signals, and then obtain two paths of parallel base frequency signals and two paths of parallel frequency doubling signals.
As an embodiment, the step 1 specifically includes: a fundamental frequency signal is input into a light modulator, and laser emitted by the laser passes through a 1 x 2 optical coupler and is divided into two paths with equal power; one path is directly output as a local oscillation optical signal; and the other path enters an optical modulator, and a modulated optical signal is obtained under the amplitude modulation of the input fundamental frequency signal.
As an embodiment, the step 2 specifically includes: the local oscillation optical signal and the modulation optical signal are respectively input into the 90-degree optical hybrid coupler, and four paths of synthetic optical signals are obtained after branching, phase shifting, overlapping and beating in the 90-degree optical hybrid coupler: a first combined optical signal, a second combined optical signal, a third combined optical signal, and a fourth combined optical signal.
As an embodiment, the step 3 specifically includes: the first synthesized optical signal and the second synthesized optical signal are input into a first balanced optical detector for photoelectric subtraction detection, and a base frequency signal is obtained through output; and inputting the third synthesized optical signal and the fourth synthesized optical signal into a second balanced optical detector for photoelectric subtraction detection, and outputting to obtain a frequency doubling signal.
The following provides a specific embodiment of the optical power calculation scheme for the first combined optical signal, the second combined optical signal, the third combined optical signal, and the fourth combined optical signal:
in the formula, A 0 The intensity of the optical electric field after power division of the laser, C m For modulating the electric field loss coefficient, C, of the optical signal L The electric field loss coefficient of the local oscillator optical signal is phi, which is the optical wave phase change caused by the fundamental frequency signal. The expressions (1), (2), (3) and (4) correspond to optical power calculation expressions for the first combined optical signal, the second combined optical signal, the third combined optical signal and the fourth combined optical signal, respectively.
The invention provides a brand-new radio frequency optical fiber link and a method for parallelly outputting fundamental frequency signals and frequency doubling signals, has the advantages of high performance, simple and convenient structure and the like, and has important application value for realizing generation and distribution of broadband radio frequency signals for radio frequency photon sensing and other equipment in biomedical engineering.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention to illustrate the technical solutions of the present invention, but not to limit the technical solutions, and certainly not to limit the scope of the present invention; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention; that is, the technical problems to be solved by the present invention are still consistent with the present invention, and all the modifications or changes made without substantial meaning in the spirit and scope of the present invention should be 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 of the invention is included in the patent protection scope of the invention.
Claims (10)
1. The radio frequency optical fiber link is characterized by comprising an optical signal generating unit, an optical signal distribution and synthesis unit and a multi-channel photoelectric conversion unit, wherein the input of the optical signal generating unit is a base frequency signal, the optical signal generating unit is provided with a local oscillator optical signal output end and a modulation optical signal output end, the local oscillator optical signal output end and the modulation optical signal output end are both connected with the optical signal distribution and synthesis unit, the optical signal distribution and synthesis unit is provided with a first synthesis optical signal output end, a second synthesis optical signal output end, a third synthesis optical signal output end and a fourth synthesis optical signal output end, the first synthesis optical signal output end, the second synthesis optical signal output end, the third synthesis optical signal output end and the fourth synthesis optical signal output end are all connected with the multi-channel photoelectric conversion unit, and the multi-channel photoelectric conversion unit outputs the base frequency signal and the frequency multiplication signal.
2. The rf optical fiber link according to claim 1, wherein the optical signal generating unit includes a laser, a 1 x 2 optical coupler and an optical modulator, the laser is connected to the 1 x 2 optical coupler, the 1 x 2 optical coupler has a first output end and a second output end, the first output end is a local oscillator optical signal output end, the second output end is connected to the optical modulator, the fundamental frequency signal is input to the input end of the optical modulator, and the output end of the optical modulator is a modulated optical signal output end and outputs a modulated optical signal.
3. The rf optical fiber link according to claim 2, wherein the optical signal distribution and synthesis unit comprises a 90 ° optical hybrid coupler, and the local oscillator optical signal output end of the 1 x 2 optical coupler and the modulation optical signal output end of the optical modulator are both connected to the input end of the 90 ° optical hybrid coupler.
4. The rf optical fiber link according to claim 3, wherein the multi-channel optical-to-electrical conversion unit includes a first balanced optical detector and a second balanced optical detector, the first and second combined optical signal outputs are connected to the first balanced optical detector, the first balanced optical detector outputs a baseband signal, the third and fourth combined optical signal outputs are connected to the second balanced optical detector, and the second balanced optical detector outputs a frequency-doubled signal.
5. The RF optical fiber link of claim 4, wherein the optical powers of the first, second, third and fourth synthesized optical signals are expressed as:
in the formula, A 0 The intensity of the optical electric field after power division of the laser, C m For modulating the electric field loss coefficient, C, of the optical signal L The electric field loss coefficient of the local oscillator optical signal is phi, which is the optical wave phase change caused by the fundamental frequency signal.
6. The method for realizing the radio frequency optical fiber link for parallelly outputting the base frequency signal and the frequency doubling signal is characterized by comprising the following steps of:
step 1, inputting a fundamental frequency signal into an optical signal generating unit to obtain a modulated optical signal and a local oscillator optical signal;
step 2, inputting the modulated optical signal and the local oscillator optical signal into an optical signal distribution synthesis unit to obtain four paths of synthesized optical signals which are a first synthesized optical signal, a second synthesized optical signal, a third synthesized optical signal and a fourth synthesized optical signal respectively;
and 3, inputting the four paths of synthesized optical signals into a multi-channel photoelectric conversion unit, and outputting two paths of radio frequency signals which are respectively a base frequency signal and a frequency doubling signal.
7. The method for implementing the rf optical fiber link in which the baseband signal and the frequency-doubled signal are output in parallel according to claim 6, wherein the step 1 specifically comprises: a fundamental frequency signal is input into a light modulator, and laser emitted by the laser passes through a 1 x 2 optical coupler and is divided into two paths with equal power; one path is directly output as a local oscillator optical signal, and the other path enters an optical modulator and obtains a modulated optical signal under the amplitude modulation of an input fundamental frequency signal.
8. The method for implementing the rf optical fiber link according to claim 7, wherein the step 2 is specifically as follows: the local oscillation optical signal and the modulated optical signal are respectively input into the 90-degree optical hybrid coupler, and four paths of synthetic optical signals, namely a first synthetic optical signal, a second synthetic optical signal, a third synthetic optical signal and a fourth synthetic optical signal, are obtained after branching, phase shifting, superposition and beating in the 90-degree optical hybrid coupler.
9. The method according to claim 8, wherein the optical powers of the first synthesized optical signal, the second synthesized optical signal, the third synthesized optical signal, and the fourth synthesized optical signal are respectively expressed as:
in the formula, A 0 The intensity of the optical electric field after power division of the laser, C m For modulating the electric field loss coefficient, C, of optical signals L Is the electric field loss coefficient of the local oscillator optical signal, phi is the fundamental frequency signal indexThe phase of the light wave changes.
10. The method for implementing the rf optical fiber link according to claim 6, wherein the step 3 is specifically as follows: the first synthesized optical signal and the second synthesized optical signal are input into a first balanced optical detector for photoelectric subtraction detection, and a base frequency signal is obtained through output; and inputting the third synthesized optical signal and the fourth synthesized optical signal into a second balanced optical detector for photoelectric subtraction detection, and outputting to obtain a frequency doubling signal.
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| CN116707650A (en) * | 2023-08-07 | 2023-09-05 | 四川省医学科学院·四川省人民医院 | Replication frequency shift system of broadband transient signal and implementation method thereof |
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| CN116707650A (en) * | 2023-08-07 | 2023-09-05 | 四川省医学科学院·四川省人民医院 | Replication frequency shift system of broadband transient signal and implementation method thereof |
| CN116707650B (en) * | 2023-08-07 | 2023-10-10 | 四川省医学科学院·四川省人民医院 | Replication frequency shift system of broadband transient signal and implementation method thereof |
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