CN116232463A - Electric signal generating device and method thereof - Google Patents
Electric signal generating device and method thereof Download PDFInfo
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- CN116232463A CN116232463A CN202310513848.3A CN202310513848A CN116232463A CN 116232463 A CN116232463 A CN 116232463A CN 202310513848 A CN202310513848 A CN 202310513848A CN 116232463 A CN116232463 A CN 116232463A
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Abstract
The application provides an electric signal generating device and a method thereof. The device comprises a laser light source, an optical coupler, a first electro-optical modulation module, a second electro-optical modulation module, a signal generator, a single-mode optical fiber, an optical circulator, a photoelectric detector and an electric power divider. The laser light source is connected with the optical coupler, and the first coupling output port and the second coupling output port of the optical coupler are respectively connected with the first electro-optic modulation module and the second electro-optic modulation module; the optical output port of the first electro-optical modulation module is connected with a single-mode optical fiber, the optical output port of the second electro-optical modulation module is connected to the first port of the optical circulator, and the radio frequency port of the second electro-optical modulation module is connected with a signal generator; the second port of the optical circulator is connected with the single-mode optical fiber, and the third port of the optical circulator is connected with the photoelectric detector; the electric output port of the photoelectric detector is connected with the electric power divider, the first power divider output port of the electric power divider is connected to the radio frequency port of the first electro-optical modulation module, and the second power divider output port is used for outputting an electric signal with adjustable frequency.
Description
Technical Field
The present disclosure relates to the field of signal generation technologies, and in particular, to an electrical signal generating device and a method thereof.
Background
In recent years, optical fiber communication using an optical signal as a carrier and an optical fiber as a medium has been widely studied by students at home and abroad, and with the application of various multiplexing and advanced coding techniques, optical interconnection transmission represented by optical fiber communication has the advantages of large transmission bandwidth, low transmission loss, high transmission rate and long transmission distance. With the vigorous development of optical technology, a method for solving the problem in the microwave field by utilizing the optical technology gradually goes into the field of view, and the microwave photonics technology starts to be researched more and more, so that the method becomes a hot spot in recent years. The microwave photonics technology for transmitting, processing and other operations of the microwave signals by taking the optical signals as carriers combines the optical field and the microwave field, amplifies the advantages of the optical field and the microwave field, and derives a plurality of photoelectric devices and photonics microwave signal processing systems with excellent performance, which work in the microwave frequency band.
Conventional devices and methods for generating electrical signals in pure electronics have difficulty maintaining high extinction ratio, low noise, narrow bandwidth electrical signal output, and are susceptible to electromagnetic interference at low cost.
Disclosure of Invention
The purpose of the present application is to provide an electric signal generating device and method that can generate an electric signal with a high extinction ratio, low noise, a narrow bandwidth, and adjustable frequency, and that can reduce the cost.
One aspect of the present application provides an electrical signal generating device. The electric signal generating device comprises a laser light source, an optical coupler, a first electro-optical modulation module, a second electro-optical modulation module, a signal generator, a single-mode optical fiber, an optical circulator, a photoelectric detector and an electric power divider, wherein the laser light source is connected with a coupling input port of the optical coupler, a first coupling output port of the optical coupler is connected with the first electro-optical modulation module, and a second coupling output port of the optical coupler is connected with the second electro-optical modulation module; the optical output port of the first electro-optical modulation module is connected with the single-mode optical fiber, the optical output port of the second electro-optical modulation module is connected to the first port of the optical circulator, and the radio frequency port of the second electro-optical modulation module is connected with the signal generator; the second port of the optical circulator is connected with the single-mode optical fiber, and the third port of the optical circulator is connected with the photoelectric detector; and the electric output port of the photoelectric detector is connected with the electric power divider, the first power divider output port of the electric power divider is connected to the radio frequency port of the first electro-optical modulation module, and the second power divider output port of the electric power divider is used for outputting an electric signal with adjustable frequency.
Further, the electrical signal generating device further includes an optical amplifier, and the optical output port of the second electro-optical modulation module is connected to the first port of the optical circulator through the optical amplifier.
Further, the electric signal generating device further comprises an electric amplifier, and the first power division output port of the electric power divider is connected to the radio frequency port of the first electro-optical modulation module through the electric amplifier.
Further, the frequency of the electric signal outputted is equal to the frequency of the signal generated by the signal generator minus the stimulated brillouin shift of the stimulated brillouin scattering effect generated in the single mode optical fiber.
Further, the magnitude of the stimulated brillouin shift is determined by the single mode optical fiber.
Further, the electric signal generating device further comprises a signal analyzer, wherein the signal analyzer is connected to the second power division output port of the electric power divider and is used for monitoring the output electric signal.
Further, the laser light source comprises a continuous light source capable of outputting light in a wavelength range of 1500 nm-1600 nm.
Further, the signal generator comprises a high-frequency signal generator capable of outputting an electric signal within a frequency range of 0-40GHz, and the response bandwidth of the photoelectric detector is 0-40 GHz.
Further, the optocoupler comprises a split-two optocoupler, and the ratio of the optical power of the first and second coupling-out ports of the optocoupler comprises 50:50, 20:80, or 30:70.
Further, the electric power divider comprises a one-to-two electric power divider, and the electric power ratio of the first power division output port to the second power division output port of the electric power divider comprises 50:50, 20:80 or 30:70.
Further, the first electro-optic modulation module and the second electro-optic modulation module each include a single sideband modulation module, a double sideband modulation module, a carrier rejection double sideband rejection module, an intensity modulation module, or a phase modulation module.
Further, the electro-optical modulation bandwidths of the first electro-optical modulation module and the second electro-optical modulation module are all in the range of 0-40 GHz.
Further, the first electro-optic modulation module includes a phase modulator and the second electro-optic modulation module includes a Mach-Zehnder modulator.
Further, the first electro-optic modulation module includes an intensity modulator and an optical filter, and the second electro-optic modulation module includes a Mach-Zehnder modulator.
Another aspect of the present application provides a method of generating an electrical signal. The electric signal generating method comprises the following steps: outputting continuous light by using a laser light source; dividing light into a first path of light and a second path of light by utilizing an optical coupler, and respectively inputting the first path of light and the second path of light into a first electro-optical modulation module and a second electro-optical modulation module; modulating the electric signal output by the signal generator onto the second path of light by using the second electro-optical modulation module so as to generate a first optical modulation signal; inputting the first optical modulation signal into a single-mode optical fiber through a first port and a second port of an optical circulator; the first optical modulation signal generates stimulated Brillouin scattering effect in the single-mode optical fiber so as to amplify the light output by the first electro-optical modulation module transmitted in the opposite direction; inputting the amplified light into a photoelectric detector through a second port and a third port of the optical circulator to generate a beat frequency signal; inputting at least a part of the beat frequency signal to a radio frequency port of the first electro-optic modulation module through a first power division output port of an electric power divider; modulating the beat signal onto the first path of light by using the first electro-optic modulation module to generate a second optical modulation signal; the generated second optical modulation signal is continuously amplified by the stimulated Brillouin scattering effect generated by the first optical modulation signal, so that a closed loop photoelectric link is formed; and the beat frequency signal is continuously and circularly amplified in the closed loop photoelectric link, and finally, an electric signal with adjustable frequency is output through a second power division output port of the power divider.
Further, the electric signal generating method further includes: and amplifying the first optical modulation signal by an optical amplifier and then entering the single-mode optical fiber through a first port and a second port of the optical circulator.
Further, the causing the first optical modulation signal to generate stimulated brillouin scattering effect in the single mode optical fiber includes: the amplification of the optical amplifier is adjusted to cause the first optical modulation signal to produce stimulated brillouin scattering effects in the single mode optical fiber.
Further, the electric signal generating method further includes: and amplifying the beat frequency signal output by the first power division output port of the electric power divider by an electric amplifier and inputting the beat frequency signal to the radio frequency port of the first electro-optic modulation module.
Further, the electric signal generating method further includes: the frequency of the output electrical signal is adjusted by adjusting the frequency of the signal generator.
The electric signal generating device and the method thereof can at least obtain the following beneficial technical effects:
(1) The stimulated Brillouin scattering effect in the single-mode fiber is utilized to convert the beat frequency signal generated by the photoelectric detector from the microwave field to the optical field for amplification, and the amplification in the optical field has the remarkable advantages of high gain, narrow bandwidth, low threshold value and the like; the beat frequency signal is amplified in the optical field and then transferred to the microwave field to form a stable photoelectric oscillation loop, and the beat frequency signal is circularly amplified in the loop to finally form a stable electric signal output. The beat frequency signal is circularly amplified to transfer the advantages of the optical field into the electric signal of the microwave field, and the output electric signal has the advantages of high extinction ratio, low noise and narrow bandwidth.
(2) The method and the device ingeniously utilize the principle that pumping light with different frequencies in the stimulated Brillouin effect corresponds to the same Brillouin frequency shift, and linearly correspond the frequency of the signal generated by the signal generator with the frequency of the generated electric signal, so that the frequency of the generated electric signal is flexible and adjustable.
Drawings
Fig. 1 is a schematic structural diagram of an electrical signal generating device according to an embodiment of the present application.
Fig. 2 is a schematic spectrum diagram of the stimulated brillouin scattering effect in the electric signal generating apparatus shown in fig. 1.
Fig. 3 is a schematic structural diagram of a first embodiment of the electrical signal generating device shown in fig. 1.
Fig. 4 is a schematic diagram of spectrum and beat frequency spectrum in the optical path of the electric signal generating device shown in fig. 3.
Fig. 5 is a schematic structural diagram of a second embodiment of the electrical signal generating device shown in fig. 1.
Fig. 6 is a schematic diagram of spectrum and beat frequency spectrum in the optical path of the electric signal generating device shown in fig. 5.
Fig. 7 is a flowchart of an electrical signal generating method according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus consistent with some aspects of the present application as detailed in the accompanying claims.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. As used in the specification of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The embodiment of the application provides an electric signal generating device and a method thereof, which have the advantages of low cost, high extinction ratio, low noise, narrow bandwidth and the like by applying the photonics technology to the microwave field, can be used for generating electric signals with high extinction ratio, low noise, narrow bandwidth and adjustable frequency, can reduce the cost, and can be applied to a plurality of fields such as communication, radar detection and the like.
Fig. 1 discloses a schematic structure of an electrical signal generating device 100 according to an embodiment of the present application. As shown in fig. 1, an electrical signal generating device 100 according to one embodiment of the present application includes a laser light source 101, an optical coupler 102, a first electro-optical modulation module 103, a second electro-optical modulation module 104, a signal generator 105, a single-mode optical fiber 106, an optical circulator 108, a photodetector 109, and an electric power divider 110.
The laser light source 101 is connected to a coupling-in port of the optical coupler 102, a first coupling-out port of the optical coupler 102 is connected to the first electro-optical modulation module 103, and a second coupling-out port of the optical coupler 102 is connected to the second electro-optical modulation module 104.
The optical output port of the first electro-optical modulation module 103 is connected to a single-mode optical fiber 106, the optical output port of the second electro-optical modulation module 104 is connected to a first port of an optical circulator 108, and the radio frequency port of the second electro-optical modulation module 104 is connected to a signal generator 105.
A second port of the optical circulator 108 is connected to the single mode optical fiber 106 and a third port of the optical circulator 108 is connected to the photodetector 109. The electrical output port of the photodetector 109 is connected to the power divider 110, and the first power divider output port of the power divider 110 is connected to the radio frequency port of the first electro-optical modulation module 103, and the second power divider output port of the power divider 110 is used for outputting an electrical signal with adjustable frequency.
In some embodiments, the electrical signal generating apparatus 100 of the present application may further include an optical amplifier 107. Wherein the optical output port of the second electro-optical modulation module 104 is connected to a first port of an optical circulator 108 via an optical amplifier 107.
In some embodiments, the electrical signal generating apparatus 100 of the present application may further include an electrical amplifier 111. Wherein the first power division output port of the power divider 110 is connected to the radio frequency port of the first electro-optical modulation module 103 through an electrical amplifier 111.
In some embodiments, the electrical signal generating apparatus 100 of the present application may further include a signal analyzer 112. The signal analyzer 112 is connected to the second power division output port of the power divider 110, and may be used to monitor the output electrical signal.
In the electric signal generating device 100 of the present application, a laser light source 101 outputs continuous light, which is split into two paths through two coupling output ports of an optical coupler 102, and the first path of light enters a single-mode optical fiber 106 after being modulated by a first electro-optical modulation module 103; the second path of light is input to the second electro-optical modulation module 104, modulated by the second electro-optical modulation module 104, amplified by the optical amplifier 107, and the radio frequency port of the second electro-optical modulation module 104 is accessed by the signal generator 105. The second path of light is modulated and amplified and then enters the single mode optical fiber 106 where the first path of light is located through the optical circulator 108. When the modulation sidebands of the second path of light are amplified sufficiently to exceed the brillouin threshold, stimulated brillouin scattering effects are generated as pump light in the single mode optical fiber 106, and maximum gain is generated for light of the first path of light transmitted in the opposite direction in the single mode optical fiber 106, which is different from the pump light in frequency by the brillouin shift, as shown in fig. 2. Fig. 2 discloses a spectral diagram of the stimulated brillouin scattering effect in the electrical signal generating apparatus 100 shown in fig. 1. In the case of the figure of the drawings in which,
for the carrier frequency of the second path of light, +.>
Frequency of the signal generated for the signal generator 105, < >>
The second path of light is modulated by a second electro-optic lightModulation sideband frequency generated after modulation by modulation module 104, < >>
Is the stimulated brillouin shift. In the first light path at->
The light at the frequency is amplified and passed through an optical circulator 108 and then beaten with the carrier wave in a photodetector 109, generating a frequency +.>
Is a beat signal of (a). The beat frequency signal is divided into two parts by an electric power divider 110, one part is amplified by an electric amplifier 111 and then is connected to a radio frequency port of a first electro-optical modulation module 103, and is modulated onto a first path of light and then is amplified by stimulated Brillouin effect generated by a modulation sideband of a second path of light, and the above processes are repeated continuously and circularly; another part of the beat signal is output as a stable electric signal, which can be detected by the signal analyzer 112 and has a frequency of
。
The electrical signal generating device 100 of the present application forms a closed loop photoelectric link between the first electro-optical modulation module 103, the single-mode optical fiber 106, the optical circulator 108, the photodetector 109, the first power division output port of the power divider 110, and the electrical amplifier 111, and generates photoelectric oscillation. The beat signal can be circularly amplified continuously in the closed loop photoelectric link, the extinction ratio is increased continuously, the noise is reduced continuously, the bandwidth is narrowed continuously, and finally, the beat signal tends to be stable, and is output by the second power division output port of the power divider 110.
The frequency of the electric signal generated by the electric signal generating device 100 according to the embodiment of the present application is
I.e. the frequency of the signal generated by the signal generator 105 minus the stimulated brillouin shift of the stimulated brillouin scattering effect generated in the single mode fibre 106. Wherein the magnitude of the stimulated brillouin shift is determined by the single mode fiber 106 and does not follow the signal generator 105, and the frequency of the signal generated by the power supply circuit is changed. Therefore, the frequency of the electric signal generated by the electric signal generating device 100 according to the embodiment of the present application can be flexibly adjusted by the frequency of the signal generated by the signal generator 105.
The stimulated brillouin scattering effect in the single-mode fiber 106 has excellent characteristics of high gain, narrow bandwidth, easiness in implementation and the like, and has wide application in various fields such as optical communication, optical sensing, optical amplification, spectral analysis, optical remote sensing, microwave photonics and the like. The stimulated Brillouin scattering effect is combined with the microwave photonics technology, so that a closed-loop photoelectric link can be realized, stable photoelectric oscillation is generated, the device has the advantages of electromagnetic interference resistance, low cost and the like, high-quality electric signals with high extinction ratio, low noise and narrow bandwidth can be output, and meanwhile, the frequency of the output electric signals can be flexibly adjusted.
Optionally, the laser light source 101 includes a continuous light source capable of outputting light in a wavelength range of 1500nm to 1600 nm.
Optionally, the signal generator 105 includes a high-frequency signal generator that can output an electrical signal in a frequency range of 0 to 40ghz, so that the frequency adjustable range of the generated electrical signal can be enlarged.
Alternatively, signal analyzer 112 includes a high frequency signal analyzer that can analyze electrical signals in the 0-40GHz frequency range, and can monitor electrical signals in a wide frequency range.
Alternatively, the first electro-optic modulation module 103 and the second electro-optic modulation module 104 may each comprise an electro-optic modulation module that may perform single sideband modulation, double sideband modulation, carrier suppressed double sideband modulation, intensity modulation, phase modulation, or any other modulation mode. Optionally, the electro-optical modulation bandwidths of the first electro-optical modulation module 103 and the second electro-optical modulation module 104 are all in the range of 0-40 ghz.
Optionally, the response bandwidth of the photodetector 109 is 0 to 40ghz, so that the frequency adjustable range of the generated electrical signal can be enlarged.
Optionally, the optocoupler 102 includes a split optocoupler 102, and the optical power ratio of the first and second coupling-out ports of the optocoupler 102 may include 50:50, 20:80, 30:70, or any other optical power ratio that satisfies the condition.
Optionally, the electric power divider 110 includes a one-to-two electric power divider 110, and the electric power ratio of the first power division output port and the second power division output port of the electric power divider 110 includes 50:50, 20:80, 30:70, or any other electric power ratio satisfying the condition.
The relevant principles involved in the electrical signal generating apparatus 100 of the present application will be described in detail below in connection with two specific embodiments.
First embodiment
Fig. 3 discloses a schematic structural diagram of a first embodiment of the electrical signal generating apparatus 100 shown in fig. 1. As shown in fig. 3, in the first embodiment, the first electro-optical modulation module 103 is a phase modulator 201, and generates two modulation sidebands with opposite phases, equal amplitude and equal frequency difference of the carrier wave during modulation; the second electro-optical modulation module 104 is a mach-zehnder modulator 202, and the modulation format is carrier-suppressed double-sideband modulation, and when in modulation, two modulation sidebands with equal phases and amplitudes and equal frequency difference with the carrier are generated. The stimulated Brillouin frequency shift determined by the single-mode fiber 106 is 10.6GHz, and the signal frequency outputted by the signal generator 105
From 10.6GHz to 40GHz.
Fig. 4 shows a schematic diagram of spectrum and beat spectrum in the optical path of the electric signal generating apparatus 100 shown in fig. 3. Referring to fig. 4 in combination, the second path of light is modulated by the mach-zehnder modulator 202, and the radio frequency port of the mach-zehnder modulator 202 is connected to the signal generator 105 and is on a carrier wave
Two modulation sidebands are respectively generated on the upper side and the lower side of the (a)>
、/>
. The modulation sideband of the second path of light is amplified and then enters through the optical circulator 108Is introduced into the single-mode optical fiber 106 to generate stimulated Brillouin scattering effect, and the first light transmitted in the opposite direction is amplified>
Light of a frequency. The first light is amplified and then enters the photodetector 109 through the optical circulator 108, < ->
Light and carrier at frequency->
Beat frequency generation frequency is +.>
Is a beat signal of (a). The beat signal passes through the power divider 110, and a part of the beat signal is amplified by the electric amplifier 111 and then modulated on the first path of light by the phase modulator 201 to generate +.>
And->
Two modulation sidebands, one of which is->
And a portion of it is amplified by the stimulated brillouin effect as described above, and another portion of it is directly output monitored by the signal analyzer 112. Modulation sideband->
Amplified and then enters the photodetector 109 and carrier wave through the optical circulator 108>
Generating beat signal->
Then the electric power is modulated by the phase modulator 201 through the electric power divider 110 and the electric amplifier 111, and then amplified by the stimulated brillouin scattering effect to form a closed loop photoelectric link. Beat frequency signalNumber->
Is continuously amplified in a cyclic manner in the closed-loop photoelectric link, the extinction ratio of the cyclic amplification is continuously increased, the noise is continuously reduced, the bandwidth is continuously narrowed, and finally, a stable electric signal is formed and output from the electric power divider 110 is monitored by the signal analyzer 112.
The frequency of the electrical signal generated in the first embodiment is
Wherein->
The frequency of the frequency-adjustable electric signal generated in the first embodiment is adjusted to be within the range of 0-29.4 GHz from 10.6GHz to 40GHz.
Second embodiment
Fig. 5 discloses a schematic structural diagram of a second embodiment of the electrical signal generating apparatus 100 shown in fig. 1. As shown in fig. 5, in a second embodiment, the first electro-optic modulation module 103 includes an intensity modulator 203 and an optical filter 204, which can implement single sideband modulation, producing one modulation sideband; the second electro-optical modulation module 104 is a mach-zehnder modulator 202, and the modulation format is carrier-suppressed double-sideband modulation, and when in modulation, two modulation sidebands with equal phases and amplitudes and equal frequency difference with the carrier are generated. The stimulated Brillouin frequency shift determined by the single-mode fiber 106 is 11.2GHz, and the signal frequency output by the signal generator 105 is
From 11.2GHz to 40GHz.
Fig. 6 shows a schematic diagram of spectrum and beat frequency spectrum in the optical path of the electric signal generating apparatus 100 shown in fig. 5. Referring to fig. 6 in combination, the second path of light is modulated by the mach-zehnder modulator 202, and the radio frequency port of the mach-zehnder modulator 202 is connected to the signal generator 105 and is on a carrier wave
Respectively generates two modulation edges on the upper and lower sides of (a)Belt->
、/>
. The modulation sideband of the second path of light is amplified and then enters the single-mode optical fiber 106 through the optical circulator 108 to generate stimulated Brillouin scattering effect, and the first path of light transmitted in the opposite direction is amplified and positioned at +.>
Light of a frequency. The first light is amplified and then enters the photodetector 109 through the optical circulator 108, < ->
Light and carrier at frequency->
Beat frequency generation frequency is
Is a beat signal of (a). The beat signal passes through the power divider 110, a part of the beat signal is amplified by the electric amplifier 111 and then modulated on the first path of light by the intensity modulator 203, one sideband is filtered by the optical filter 204, single sideband modulation is realized, and the single sideband modulation is generated at the position ∈ ->
A portion of this sideband is again amplified by the stimulated brillouin effect as described above; the other part is directly output and monitored by the signal analyzer 112. Modulation sideband->
Amplified and then enters the photodetector 109 and carrier wave through the optical circulator 108>
Generating beat signal->
Then pass through the power divider 110 and the electric amplifierThe modulator 111 is modulated by an intensity modulator 203, and one sideband is filtered by an optical filter 204 and then amplified by the stimulated brillouin scattering effect to form a closed loop optical link. Beat signal->
Is continuously amplified in a circulating way in the closed loop photoelectric link, the extinction ratio is continuously increased, the noise is continuously reduced, the bandwidth is continuously narrowed, and finally, a stable electric signal is formed and output from the electric power divider 110 and is monitored by the signal analyzer 112.
The frequency of the electrical signal generated in the second embodiment is
Wherein->
Changing from 11.2GHz to 40GHz, the frequency adjustment range of the frequency tunable electrical signal produced in the second embodiment is 0-28.8GHz.
Fig. 7 discloses a flowchart of an electrical signal generation method according to one embodiment of the present application. As shown in fig. 7, the electrical signal generating method according to an embodiment of the present application may include steps S1 to S10.
In step S1, continuous light is output by the laser light source 101.
In step S2, the light is split into a first path of light and a second path of light by the optical coupler 102, and input to the first electro-optical modulation module 103 and the second electro-optical modulation module 104, respectively.
In step S3, the electrical signal output from the signal generator 105 is modulated onto the second path of light by the second electro-optical modulation module 104 to generate a first optical modulation signal.
In step S4, the first optical modulation signal is input into the single-mode optical fiber 106.
For example, a first optical modulation signal may be input into the single mode optical fiber 106 through the first port and the second port of the optical circulator 108.
In step S5, the first optical modulation signal is caused to generate the stimulated brillouin scattering effect in the single-mode optical fiber 106 to amplify the light output from the first electro-optical modulation module 103 transmitted in the opposite direction.
In step S6, the amplified light is input to the photodetector 109, generating a beat signal.
For example, the amplified light may be input into the photodetector 109 through the second port and the third port of the optical circulator 108.
In step S7, at least a part of the beat signal is input to the radio frequency port of the first electro-optical modulation module 103 via the first power division output port of the power divider 110.
In step S8, the beat signal is modulated onto the first path of light by the first electro-optical modulation module 103 to generate a second optical modulation signal.
In step S9, the generated second optical modulation signal is further amplified by the stimulated brillouin scattering effect generated by the first optical modulation signal to form a closed loop optical-electrical link.
In step S10, the beat signal is continuously circularly amplified in the closed loop optical-electrical link, and finally, the frequency-adjustable electric signal is output through the second power division output port of the power divider 110.
In some embodiments, the electrical signal generating method of the present application may further include: the first optical modulation signal is amplified by the optical amplifier 107 and then enters the single-mode optical fiber 106 through the first port and the second port of the optical circulator 108.
In some embodiments, causing the first optical modulation signal to produce the stimulated brillouin effect in the single mode optical fiber 106 in step S5 comprises: the amplification of the optical amplifier 107 is adjusted so that the first optical modulation signal generates stimulated brillouin scattering effect in the single mode optical fiber 106.
In some embodiments, the electrical signal generating method of the present application may further include: the beat signal output through the first power division output port of the power divider 110 is amplified by the electric amplifier 111 and then input to the radio frequency port of the first electro-optical modulation module 103.
In some embodiments, the electrical signal generating method of the present application may further include: the magnitude of the frequency of the output electrical signal is adjusted by adjusting the frequency of the signal generator 105.
The electrical signal generating device 100 and the method thereof according to the embodiments of the present application can at least obtain the following beneficial technical effects:
(1) The stimulated Brillouin scattering effect in the single-mode fiber 106 is utilized, the beat frequency signal generated by the photoelectric detector 109 is converted from the microwave field to the optical field for amplification, and the amplification in the optical field has the remarkable advantages of high gain, narrow bandwidth, low threshold value and the like; the beat frequency signal is amplified in the optical field and then transferred to the microwave field to form a stable photoelectric oscillation loop, and the beat frequency signal is circularly amplified in the loop to finally form a stable electric signal output. The beat frequency signal is circularly amplified to transfer the advantages of the optical field into the electric signal of the microwave field, and the output electric signal has the advantages of high extinction ratio, low noise and narrow bandwidth.
(2) The principle that pumping light with different frequencies in stimulated Brillouin effect corresponds to the same Brillouin frequency shift is ingeniously utilized, the frequency of a signal generated by the signal generator 105 is linearly corresponding to the frequency of the generated electric signal, and the frequency of the generated electric signal is flexible and adjustable.
The electric signal generating device and the method thereof provided by the embodiment of the application are described in detail above. Specific examples are used herein to describe the electrical signal generating device and the method thereof according to the embodiments of the present application, and the description of the above embodiments is only for helping to understand the core ideas of the present application, and is not intended to limit the present application. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made herein without departing from the spirit and principles of the invention, which should also fall within the scope of the appended claims.
Claims (19)
1. An electrical signal generating device, characterized in that: comprises a laser light source, an optical coupler, a first electro-optical modulation module, a second electro-optical modulation module, a signal generator, a single-mode optical fiber, an optical circulator, a photoelectric detector and an electric power divider,
the laser light source is connected with a coupling input port of the optical coupler, a first coupling output port of the optical coupler is connected with the first electro-optical modulation module, and a second coupling output port of the optical coupler is connected with the second electro-optical modulation module;
the optical output port of the first electro-optical modulation module is connected with the single-mode optical fiber, the optical output port of the second electro-optical modulation module is connected to the first port of the optical circulator, and the radio frequency port of the second electro-optical modulation module is connected with the signal generator;
the second port of the optical circulator is connected with the single-mode optical fiber, and the third port of the optical circulator is connected with the photoelectric detector; a kind of electronic device with high-pressure air-conditioning system
The electric output port of the photoelectric detector is connected with the electric power divider, the first power divider output port of the electric power divider is connected to the radio frequency port of the first electro-optical modulation module, and the second power divider output port of the electric power divider is used for outputting an electric signal with adjustable frequency.
2. The electrical signal generating apparatus according to claim 1, wherein: the optical output port of the second electro-optic modulation module is connected to the first port of the optical circulator through the optical amplifier.
3. The electrical signal generating apparatus according to claim 1 or 2, wherein: the first power division output port of the electric power divider is connected to the radio frequency port of the first electro-optical modulation module through the electric amplifier.
4. The electrical signal generating apparatus according to claim 1, wherein: the frequency of the electric signal outputted is equal to the frequency of the signal generated by the signal generator minus the stimulated brillouin shift of the stimulated brillouin scattering effect generated in the single mode optical fiber.
5. The electrical signal generating apparatus according to claim 4, wherein: the magnitude of the stimulated brillouin shift is determined by the single mode optical fiber.
6. The electrical signal generating apparatus according to claim 1, wherein: the power divider also comprises a signal analyzer, wherein the signal analyzer is connected to a second power divider output port of the power divider and is used for monitoring the output electric signal.
7. The electrical signal generating apparatus according to claim 1, wherein: the laser light source comprises a continuous light source capable of outputting light within a wavelength range of 1500 nm-1600 nm.
8. The electrical signal generating apparatus according to claim 1, wherein: the signal generator comprises a high-frequency signal generator capable of outputting an electric signal within a frequency range of 0-40GHz, and the response bandwidth of the photoelectric detector is 0-40 GHz.
9. The electrical signal generating apparatus according to claim 1, wherein: the optocoupler comprises a split-two optocoupler, and the ratio of optical power of the first and second coupled-out ports of the optocoupler comprises 50:50, 20:80, or 30:70.
10. The electrical signal generating apparatus according to claim 1, wherein: the electric power divider comprises a one-to-two electric power divider, and the electric power ratio of a first power division output port to a second power division output port of the electric power divider comprises 50:50, 20:80 or 30:70.
11. The electrical signal generating apparatus according to claim 1, wherein: the first electro-optical modulation module and the second electro-optical modulation module comprise a single sideband modulation module, a double sideband modulation module, a carrier suppression double sideband suppression module, an intensity modulation module or a phase modulation module.
12. The electrical signal generating apparatus according to claim 11, wherein: the electro-optical modulation bandwidths of the first electro-optical modulation module and the second electro-optical modulation module are all in the range of 0-40 GHz.
13. The electrical signal generating apparatus according to claim 11, wherein: the first electro-optic modulation module includes a phase modulator and the second electro-optic modulation module includes a Mach-Zehnder modulator.
14. The electrical signal generating apparatus according to claim 11, wherein: the first electro-optic modulation module includes an intensity modulator and an optical filter, and the second electro-optic modulation module includes a Mach-Zehnder modulator.
15. A method of generating an electrical signal, comprising:
outputting continuous light by using a laser light source;
dividing light into a first path of light and a second path of light by utilizing an optical coupler, and respectively inputting the first path of light and the second path of light into a first electro-optical modulation module and a second electro-optical modulation module;
modulating the electric signal output by the signal generator onto the second path of light by using the second electro-optical modulation module so as to generate a first optical modulation signal;
inputting the first optical modulation signal into a single-mode optical fiber through a first port and a second port of an optical circulator;
the first optical modulation signal generates stimulated Brillouin scattering effect in the single-mode optical fiber so as to amplify the light output by the first electro-optical modulation module transmitted in the opposite direction;
inputting the amplified light into a photoelectric detector through a second port and a third port of the optical circulator to generate a beat frequency signal;
inputting at least a part of the beat frequency signal to a radio frequency port of the first electro-optic modulation module through a first power division output port of an electric power divider;
modulating the beat signal onto the first path of light by using the first electro-optic modulation module to generate a second optical modulation signal;
the generated second optical modulation signal is continuously amplified by the stimulated Brillouin scattering effect generated by the first optical modulation signal, so that a closed loop photoelectric link is formed; a kind of electronic device with high-pressure air-conditioning system
The beat frequency signal is continuously circularly amplified in the closed loop photoelectric link, and finally, an electric signal with adjustable frequency is output through a second power division output port of the electric power divider.
16. The electrical signal generating method of claim 15, wherein: further comprises:
and amplifying the first optical modulation signal by an optical amplifier and then entering the single-mode optical fiber through a first port and a second port of the optical circulator.
17. The electrical signal generating method of claim 16, wherein: the causing the first optical modulation signal to produce stimulated brillouin scattering effects in the single mode optical fiber comprises:
the amplification of the optical amplifier is adjusted to cause the first optical modulation signal to produce stimulated brillouin scattering effects in the single mode optical fiber.
18. The electrical signal generating method of claim 15, wherein: further comprises:
and amplifying the beat frequency signal output by the first power division output port of the electric power divider by an electric amplifier and inputting the beat frequency signal to the radio frequency port of the first electro-optic modulation module.
19. The electrical signal generating method of claim 15, wherein: further comprises:
the frequency of the output electrical signal is adjusted by adjusting the frequency of the signal generator.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2515395A1 (en) * | 2011-04-19 | 2012-10-24 | Deutsche Telekom AG | Method and device for reducing the bandwidth of stimulated brillouin scattering |
| WO2014183412A1 (en) * | 2013-05-17 | 2014-11-20 | 国家电网公司 | Multi-parameter distributed optical fiber sensing apparatus |
| CN109586798A (en) * | 2018-12-17 | 2019-04-05 | 吉林大学 | A kind of photonics generation device of tunable multi output microwave signal |
| CN109842444A (en) * | 2019-03-11 | 2019-06-04 | 中国科学院半导体研究所 | Infant laser signal detection amplification system and method based on optical-electronic oscillator |
| CN113078545A (en) * | 2021-03-30 | 2021-07-06 | 电子科技大学 | Tunable dual-frequency photoelectric oscillator device based on stimulated Brillouin scattering |
| CN113777402A (en) * | 2021-08-31 | 2021-12-10 | 华东师范大学 | Photon-assisted microwave signal time-frequency analysis device and method based on stimulated Brillouin scattering effect |
| CN114966197A (en) * | 2021-12-30 | 2022-08-30 | 昆明理工大学 | Transient microwave frequency measuring device and method based on stimulated Brillouin scattering effect |
-
2023
- 2023-05-09 CN CN202310513848.3A patent/CN116232463A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2515395A1 (en) * | 2011-04-19 | 2012-10-24 | Deutsche Telekom AG | Method and device for reducing the bandwidth of stimulated brillouin scattering |
| WO2014183412A1 (en) * | 2013-05-17 | 2014-11-20 | 国家电网公司 | Multi-parameter distributed optical fiber sensing apparatus |
| CN109586798A (en) * | 2018-12-17 | 2019-04-05 | 吉林大学 | A kind of photonics generation device of tunable multi output microwave signal |
| CN109842444A (en) * | 2019-03-11 | 2019-06-04 | 中国科学院半导体研究所 | Infant laser signal detection amplification system and method based on optical-electronic oscillator |
| CN113078545A (en) * | 2021-03-30 | 2021-07-06 | 电子科技大学 | Tunable dual-frequency photoelectric oscillator device based on stimulated Brillouin scattering |
| CN113777402A (en) * | 2021-08-31 | 2021-12-10 | 华东师范大学 | Photon-assisted microwave signal time-frequency analysis device and method based on stimulated Brillouin scattering effect |
| CN114966197A (en) * | 2021-12-30 | 2022-08-30 | 昆明理工大学 | Transient microwave frequency measuring device and method based on stimulated Brillouin scattering effect |
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