CN115441951B - Device and method for suppressing periodic fading of microwave photon link transmission - Google Patents
Device and method for suppressing periodic fading of microwave photon link transmission Download PDFInfo
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- CN115441951B CN115441951B CN202210765256.6A CN202210765256A CN115441951B CN 115441951 B CN115441951 B CN 115441951B CN 202210765256 A CN202210765256 A CN 202210765256A CN 115441951 B CN115441951 B CN 115441951B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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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
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50575—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulator DC bias
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
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Abstract
The invention provides a device and a method for restraining periodic fading of microwave photon link transmission, and relates to the technical field of fiber optics. The device provided by the invention comprises a laser, a double parallel modulator, an optical circulator, a first light detector and a voltage feedback control circuit, wherein the double parallel modulator comprises a first sub-modulator, a second sub-modulator and a third sub-modulator. The periodic fading phenomenon of the radio frequency signal caused by the dispersion effect in the optical transmission (especially long-distance optical transmission) is realized through the components such as the double-parallel modulator and the stimulated Brillouin effect in the optical fiber, the dispersion effect suppression effect is automatically kept under the condition of changing the transmission distance, the influence of the power change of the laser can be eliminated by further optimizing the result, and the device has strong flexibility and reconfigurability.
Description
Technical Field
The invention relates to the technical field of fiber optics, in particular to a device and a method for restraining periodic fading of microwave photon link transmission.
Background
The use of optical links to transmit microwave signals has many advantages, such as low loss, large bandwidth, electromagnetic interference immunity, etc., but the inherent polarization effects of the optical fiber medium, fiber dispersion, and nonlinear effects can adversely affect the transmission of microwave signals.
For a microwave photon system, due to the influence of optical fiber dispersion, in a microwave photon transmission link, two sidebands of an optical carrier wave modulated by double sidebands generate relative phase shift, so that the amplitude of an output signal can periodically fluctuate along with the length of an optical fiber, namely, the power of a microwave signal has a periodic fading phenomenon, and the transmission performance of the microwave photon signal is limited. In order to avoid the influence of fiber dispersion on the double sideband modulation format, a novel modulation mode is required. The reason that the amplitude of the radio frequency signal output by the photoelectric detector changes periodically along with the optical fiber is that the signal on the two sidebands and the carrier beat frequency caused by dispersion obtain the result caused by superposition of radio frequency signals with the same frequency and different phases. This periodic fading phenomenon is typically avoided by single sideband modulation.
The single sideband modulation mode is mainly realized in two ways, one is a phase shift method and the other is a filtering method. The phase shift method requires that the radio frequency signals of two arms loaded on the electro-optic modulator introduce pi/2 phase difference, which is difficult to implement when compared with ultra-wideband radio frequency. The filtering method is to make the double-sideband signal pass through a sideband filter to filter out unwanted sidebands and keep the needed sidebands. The filtering method has simple structure, but is not easy to realize, especially in the case of a microwave photon link working in ultra-wideband, because the modulation sidebands are very close to the optical carrier at low frequency, the optical filter with very fine and wide passband is very difficult to obtain. And the single sideband modulation is followed by cancellation of the single sideband modulated signal, which reduces the gain of the overall transmission link by 6dB.
Disclosure of Invention
(One) solving the technical problems
Aiming at the defects of the prior art, the invention provides a device and a method for restraining the periodic fading of microwave photon link transmission, which solve the technical problem that the periodic fading phenomenon exists in microwave signal power.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme:
A microwave photon link transmission periodic fading suppression device comprises a laser, a double parallel modulator, an optical circulator, a first optical detector and a voltage feedback control circuit; the dual parallel modulator includes first, second and third sub-modulators;
The light inlet of the first sub-modulator and the light inlet of the second sub-modulator are both connected with the light outlet of the laser, the light outlet of the first sub-modulator and the light outlet of the second sub-modulator are both connected with the light inlet of the third sub-modulator, and the light outlet of the third sub-modulator is connected with the first port of the optical circulator;
The radio frequency input end of the first sub-modulator is used for receiving radio frequency signals, and the radio frequency input end of the second sub-modulator is grounded;
The second port of the optical circulator is connected to the receiving end, the third port of the optical circulator is connected with the input end of the first optical detector, the output end of the first optical detector is connected with the input end of the voltage feedback control circuit, and the output end of the voltage feedback control circuit is connected with the bias voltage input end of the third sub-modulator.
Preferably, the optical detector further comprises an optical coupler and a second optical detector;
the input end of the optical coupler is connected with the second port of the optical circulator, the first output end is connected to the receiving end through an optical fiber, the second output end is connected with the input end of the second optical detector, and the output end of the second optical detector is connected with the input end of the voltage feedback control circuit.
Preferably, the receiving end further comprises a photoelectric converter;
the photoelectric converter is connected with a second port of the optical circulator or a first output end of the optical coupler.
The method for restraining the periodic fading of the transmission of the microwave photon link adopts the device for restraining the periodic fading of the transmission of the microwave photon link, and is characterized by comprising the following steps:
the output optical signal of the laser is input into a double parallel modulator;
the first sub-modulator of the double-parallel modulator works in a carrier rejection double-sideband modulation mode, and the second sub-modulator works in a maximum light output mode;
After the optical modulation signals output by the double-parallel modulator pass through the optical circulator, stimulated Brillouin scattering generates reverse Stokes light in the optical fiber transmission process, and the reverse Stokes light is input into a first optical detector after passing through the optical circulator and is converted into a first voltage signal;
the voltage feedback control circuit adjusts the bias voltage of the third sub-modulator according to the first voltage signal so as to control the output signal of the second sub-modulator to generate phase shift relative to the output signal of the first sub-modulator, and the periodic fading phenomenon of the radio frequency power of the radio frequency signal after photoelectric conversion is avoided.
Preferably, the phase offset is defined as phi, and
Wherein D is the dispersion coefficient of the optical fiber, lambda is the wavelength of the optical signal in the optical fiber, c is the speed of light propagation in vacuum, and f m is the frequency of the radio frequency signal;
l is the distance travelled by the optical signal, and is solved by:
Where g=gi p (0) is the brillouin gain, I p (0) is the incident optical power, G is related only to the material of the optical fiber; i s (z) is an optical signal of Stokes frequency injected at the fiber termination, taking the optical field noise.
Preferably, when the power variation of the laser output optical signal needs to be considered, the method further comprises:
The coupler divides a small part of optical signals according to a preset proportion, and enters a second optical detector to be converted into a second voltage signal; and after the second voltage signal is compared with the first voltage signal, the voltage feedback control circuit adjusts the bias voltage loaded on the third sub-modulator according to the comparison result, so that the influence of the change of the output optical power of the laser is eliminated.
(III) beneficial effects
The invention provides a device and a method for restraining periodic fading of microwave photon link transmission. Compared with the prior art, the method has the following beneficial effects:
the invention realizes the periodic fading phenomenon of the radio frequency signal caused by the dispersion effect in the optical transmission (especially long-distance optical transmission) through the stimulated Brillouin effect in the double-parallel modulator and the optical fiber, the method automatically maintains the effect of inhibiting the dispersion effect under the condition of changing the transmission distance, the further optimized result can eliminate the influence of the power change of the laser, and the device has strong flexibility and reconfigurability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a device for suppressing periodic fading in microwave photon link transmission according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another periodic fading suppression device for microwave photon link transmission according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. 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.
The embodiment of the application solves the technical problem that the periodic fading phenomenon exists in the microwave signal power by providing the device and the method for suppressing the periodic fading of the microwave photon link transmission.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
Aiming at the defects of the conventional method for inhibiting the periodic fading phenomenon of long-distance transmission of a microwave photon link, the embodiment of the invention provides a method and a device for inhibiting the periodic fading phenomenon caused by the dispersion effect of a double-sideband modulated microwave photon link, the phase difference of radio frequency signals of which the upper and lower sidebands are subjected to beat frequency conversion at an optical detector and caused by the dispersion effect is regulated to be in homodromous superposition by modulating a carrier wave to the double-sideband modulator, and the optical signals reflected by the stimulated Brillouin scattering effect in an optical fiber are combined and processed to acquire the phase quantity to be regulated, so that the periodic variation of the radio frequency signals can be prevented in the variable optical fiber transmission (especially long-distance optical fiber transmission).
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1:
As shown in fig. 1, an embodiment of the present invention provides a device for suppressing periodic fading of microwave photon link transmission, which includes a laser, a double parallel modulator, an optical circulator, a first photodetector and a voltage feedback control circuit.
Wherein the dual parallel modulator comprises a first, a second and a third sub-modulator (i.e. sub-modulators 1, 2, 3 in fig. 1).
The light inlet of the first sub-modulator and the light inlet of the second sub-modulator are both connected with the light outlet of the laser, the light outlet of the first sub-modulator and the light outlet of the second sub-modulator are both connected with the light inlet of the third sub-modulator, and the light outlet of the third sub-modulator is connected with the first port of the optical circulator;
The radio frequency input end of the first sub-modulator is used for receiving radio frequency signals, and the radio frequency input end of the second sub-modulator is grounded;
The second port of the optical circulator is connected to the receiving end, the third port of the optical circulator is connected to the input end of the first optical detector (i.e., optical detector 1 in fig. 1), the output end of the first optical detector is connected to the input end of the voltage feedback control circuit, and the output end of the voltage feedback control circuit is connected to the bias voltage input end of the third sub-modulator.
In particular, the receiving end further comprises a photoelectric converter; the photoelectric converter is connected with a second port of the optical circulator or a first output end of the optical coupler.
Example 2:
On the basis of embodiment 1, in order to avoid the influence of the variation of the power of the output optical signal of the laser on the control voltage, that is, when the incident optical power varies, as shown in fig. 2, the device for suppressing the periodic fading of the microwave photon link transmission provided by the embodiment of the invention further comprises an optical coupler and a second optical detector.
The input end of the optical coupler is connected with the second port of the optical circulator, the first output end is connected to the receiving end through an optical fiber, the second output end is connected with the input end of a second optical detector (namely the optical detector 2 in fig. 2), and the output end of the second optical detector is connected with the input end of the voltage feedback control circuit.
In particular, the receiving end further comprises a photoelectric converter; the photoelectric converter is connected with a second port of the optical circulator or a first output end of the optical coupler.
Example 3:
the embodiment of the invention provides a method for restraining the transmission periodic fading of a microwave photon link, which adopts the device for restraining the transmission periodic fading of the microwave photon link provided by the embodiment, and comprises the following steps:
the output optical signal of the laser is input into a double parallel modulator;
the first sub-modulator of the double-parallel modulator works in a carrier rejection double-sideband modulation mode, and the second sub-modulator works in a maximum light output mode;
After the optical modulation signals output by the double-parallel modulator pass through the optical circulator, stimulated Brillouin scattering generates reverse Stokes light in the optical fiber transmission process, and the reverse Stokes light is input into a first optical detector after passing through the optical circulator and is converted into a first voltage signal;
the voltage feedback control circuit adjusts the bias voltage of the third sub-modulator according to the first voltage signal so as to control the output signal of the second sub-modulator to generate phase shift relative to the output signal of the first sub-modulator, and the periodic fading phenomenon of the radio frequency power of the radio frequency signal after photoelectric conversion is avoided.
To better illustrate that the present embodiment can suppress the periodic fading phenomenon of microwave photon link transmission, the following discussion is now provided:
when an optical signal is transmitted in an optical fiber, the generated phase change amount θ is proportional to the transmission distance L: θ=βl, where β is the propagation constant of the optical signal in the fiber.
Considering the dispersion of light, the phase change amount θ and the propagation constant β of the optical signal of different frequencies after the optical signal propagates by the same distance are both the amounts that change with the angular frequency ω of the optical signal, that is, θ (ω) =β (ω) L.
The dependence of β (ω) on angular frequency within the signal bandwidth can be represented by a taylor expansion at the optical carrier frequency:
Where ω 0 is the angular frequency of the optical carrier signal, β 0 is the propagation constant of the optical signal at ω 0, Higher order terms above 2 nd order are ignored in the formula for the n-th derivative of the propagation constant.
For double-sideband modulation, after the upper and lower sidebands and the optical carrier signal enter the optical detector at the same time, the upper and lower sidebands and the optical carrier signal are subjected to beat frequency respectively, the current intensity is proportional to the power of the optical signal, direct current and high-order terms of the current are ignored, and the current i + of 1 order output by the upper sideband and the carrier beat frequency and the current i - of 1 order output by the lower sideband and the carrier beat frequency can be respectively expressed as:
where ω m is the angular frequency of the loaded radio frequency signal.
Therefore, the current i o after the beat signals of the upper and lower sidebands are superimposed can be expressed as:
As can be seen from the above equation, the amplitude of the output signal is related to L, i.e. to the transmission distance. The power P o of the output radio frequency signal of the photoelectric converter is proportional to the square of the output current, namely:
The dispersion coefficient of the optical fiber Substitution into the above formula can be obtained:
where λ is the wavelength of the optical signal in the fiber and c is the speed at which the light propagates in vacuo.
As can be seen from the above equation, due to the dispersion effect, the output rf signal power varies periodically with the increase of the transmission distance L.
When by the method, by introducing a corresponding phase offset phi in the optical carrier, the current signal of its beat frequency output for the upper sideband is changed to:
the current signal of its beat frequency output for the lower sideband varies as:
Thus, the current after the beat signals of the upper and lower sidebands are superimposed can be expressed as:
The power of the output rf signal after the photoelectric conversion at the receiving end can be expressed as follows:
As can be seen from the above equation, for practical application system, if the frequency f m of the transmitted RF signal, the dispersion coefficient D of the selected optical fiber, the wavelength lambda of the optical carrier, etc. are all assumed to be fixed, the variation of phi is adjusted only according to the variation of L of the propagation distance of the modulated optical signal, so that The power of the output radio frequency signal is ensured to be irrelevant to the transmission distance, thereby achieving the aim of restraining the periodic fading.
In order to determine the optical signal propagation distance L, stimulated brillouin scattering is introduced, which is a typical nonlinear effect, and when an optical signal is transmitted in an optical fiber system, inverse stokes light is generated by scattering of incident light, the frequency of which is lower than that of the incident wave, the frequency shift of which is determined by the material of the optical fiber and the incident wavelength, and the power of the inverse stokes light at each point along its transmission direction in an optical fiber transmission link can be expressed as:
Where g=gi p (0) is the brillouin gain, I p (0) is the incident optical power, and G is related to the material of the optical fiber only. I s (z) is an optical signal of stokes frequency injected at the fiber termination, where it is considered that there is no input signal at the output termination of the fiber, so I s (z) can take the optical field noise.
It can be seen from the above equation that, for a determined optical fiber transmission link, the power of the inverse stokes optical signal at the optical fiber incident position is related to the incident optical signal power and the transmission distance L, when the incident optical power does not change, it is only in an exponential relationship with the transmission distance L, so when the inverse transmitted signal passes through the circulator and enters the photodetector, after the voltage of the optical power conversion is obtained, the voltage feedback control circuit can adjust the offset voltage control phase offset of the third sub-modulator of the dual-parallel modulator, that is, phi, according to the voltage and the corresponding relationship with the optical fiber transmission link length L, to achieve the effect of eliminating the periodic fading.
Example 4:
As can be seen from example 3, for a certain optical fiber transmission link, the power of the inverted stokes optical signal at the incidence of the optical fiber is related to both the incident optical signal power and the transmission distance L. When the situation that the incident light power is changed needs to be considered, the transmission distance cannot be determined directly through stimulated Brillouin scattering, so that the specific change situation of the incident light power needs to be clarified first, and a coupler and a second light detector are further introduced into the device adopted by the embodiment of the invention correspondingly.
Specifically, when the incident light power is required to be considered to be changed, the coupler divides a small part of light signals according to a preset proportion, and the light signals enter a second light detector to be converted into a second voltage signal; the converted second voltage signal is directly proportional to the power of the optical carrier wave transmitted by the entering optical fiber (namely, the change of the incident optical power can be deduced), after the second voltage signal is compared with the first voltage signal, the voltage feedback control circuit (which is equivalent to the voltage comparison feedback control circuit at the moment) adjusts the bias voltage loaded on the third sub-modulator according to the comparison result, so that the influence of the change of the output optical power of the laser is eliminated.
It should be separately noted that, the method for suppressing the periodic fading of the microwave photon link transmission provided by the implementation of the present invention is suitable for any scenario where the periodic fading phenomenon exists in the microwave signal power, wherein the method is preferably suitable for a long-distance optical fiber transmission system, the threshold value of stimulated brillouin scattering is lower, reverse stokes light is easier to generate, and the optical power is larger, so that the purpose of suppressing is easier to achieve.
In summary, compared with the prior art, the method has the following beneficial effects:
According to the embodiment of the invention, the periodic fading phenomenon of the radio frequency signal caused by the dispersion effect in the optical transmission (especially long-distance optical transmission) is realized through the stimulated Brillouin effect in the double-parallel modulator and the optical fiber, the effect of inhibiting the dispersion effect is automatically maintained under the condition of changing the transmission distance, the influence of the power change of the laser can be eliminated by further optimizing the result, and the device has strong flexibility and reconfigurability.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; 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 technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. The device is characterized by comprising a laser, a double-parallel modulator, an optical circulator, a first optical detector and a voltage feedback control circuit; the dual parallel modulator includes first, second and third sub-modulators;
The light inlet of the first sub-modulator and the light inlet of the second sub-modulator are both connected with the light outlet of the laser, the light outlet of the first sub-modulator and the light outlet of the second sub-modulator are both connected with the light inlet of the third sub-modulator, and the light outlet of the third sub-modulator is connected with the first port of the optical circulator;
The radio frequency input end of the first sub-modulator is used for receiving radio frequency signals, and the radio frequency input end of the second sub-modulator is grounded;
The second port of the optical circulator is connected to the receiving end, the third port of the optical circulator is connected with the input end of the first optical detector, the output end of the first optical detector is connected with the input end of the voltage feedback control circuit, and the output end of the voltage feedback control circuit is connected with the bias voltage input end of the third sub-modulator;
the method for restraining the periodic fading of the microwave photon link transmission by adopting the device for restraining the periodic fading of the microwave photon link transmission comprises the following steps:
the output optical signal of the laser is input into a double parallel modulator;
the first sub-modulator of the double-parallel modulator works in a carrier rejection double-sideband modulation mode, and the second sub-modulator works in a maximum light output mode;
After the optical modulation signals output by the double-parallel modulator pass through the optical circulator, stimulated Brillouin scattering generates reverse Stokes light in the optical fiber transmission process, and the reverse Stokes light is input into a first optical detector after passing through the optical circulator and is converted into a first voltage signal;
The voltage feedback control circuit adjusts the bias voltage of the third sub-modulator according to the first voltage signal so as to control the output signal of the second sub-modulator to generate phase shift relative to the output signal of the first sub-modulator, and the periodic fading phenomenon of the radio frequency power of the radio frequency signal after photoelectric conversion is avoided;
defining phase offset as phi, setting
Wherein D is the dispersion coefficient of the optical fiber, lambda is the wavelength of the optical signal in the optical fiber, c is the speed of light propagation in vacuum, and f m is the frequency of the radio frequency signal;
l is the distance travelled by the optical signal, and is solved by:
Where g=gi p (0) is the brillouin gain, I p (0) is the incident optical power, G is related only to the material of the optical fiber; i s (z) is an optical signal with Stokes frequency injected into the optical fiber terminal, and light field noise is taken;
when the power variation of the laser output optical signal needs to be considered, the method further comprises:
dividing a small part of optical signals according to a preset proportion, and enabling the small part of optical signals to enter a second optical detector to be converted into second voltage signals; and after the second voltage signal is compared with the first voltage signal, the voltage feedback control circuit adjusts the bias voltage loaded on the third sub-modulator according to the comparison result, so that the influence of the change of the output optical power of the laser is eliminated.
2. The microwave photon link transmission periodic fading suppression device as in claim 1 further comprising an optical coupler and a second optical detector;
the input end of the optical coupler is connected with the second port of the optical circulator, the first output end is connected to the receiving end through an optical fiber, the second output end is connected with the input end of the second optical detector, and the output end of the second optical detector is connected with the input end of the voltage feedback control circuit.
3. The microwave photon link transmission periodic fading suppressing apparatus as claimed in claim 1 or 2 wherein the receiving end further comprises an optical-to-electrical converter;
the photoelectric converter is connected with a second port of the optical circulator or a first output end of the optical coupler.
4. A method for suppressing periodic fading of microwave photon link transmission, characterized in that the device for suppressing periodic fading of microwave photon link transmission according to any one of claims 1-3 is adopted, comprising:
the output optical signal of the laser is input into a double parallel modulator;
the first sub-modulator of the double-parallel modulator works in a carrier rejection double-sideband modulation mode, and the second sub-modulator works in a maximum light output mode;
After the optical modulation signals output by the double-parallel modulator pass through the optical circulator, stimulated Brillouin scattering generates reverse Stokes light in the optical fiber transmission process, and the reverse Stokes light is input into a first optical detector after passing through the optical circulator and is converted into a first voltage signal;
the voltage feedback control circuit adjusts the bias voltage of the third sub-modulator according to the first voltage signal so as to control the output signal of the second sub-modulator to generate phase shift relative to the output signal of the first sub-modulator, and the periodic fading phenomenon of the radio frequency power of the radio frequency signal after photoelectric conversion is avoided.
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| CN111048969A (en) * | 2019-12-30 | 2020-04-21 | 电子科技大学 | Frequency doubling photoelectric oscillator based on stimulated Brillouin scattering effect |
| CN111092659A (en) * | 2019-11-29 | 2020-05-01 | 电子科技大学 | Double-chirp signal generation system based on stimulated Brillouin scattering |
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