CN110212989A - RF hopping signal generating method and device based on circulating frequency shift - Google Patents
RF hopping signal generating method and device based on circulating frequency shift Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/713—Spread spectrum techniques using frequency hopping
- H04B1/7136—Arrangements for generation of hop frequencies, e.g. using a bank of frequency sources, using continuous tuning or using a transform
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B10/508—Pulse generation, e.g. generation of solitons
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
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Abstract
Frequency is by the invention discloses a kind of RF hopping signal generating method based on circulating frequency shiftf cOptical signal be divided into two-way；Reference optical signal is obtained after carrying out shift frequency to first via optical signal；Second road optical signal is converted into periodic light pulse signal by photoswitch, light pulse signal is then inputted into circulating frequency shift module, then from the circulating frequency shift module output light Frequency Hopping Signal；Beat frequency is carried out to the smooth Frequency Hopping Signal and reference optical signal to get RF hopping signal is arrived, and the centre frequency of the RF hopping signal can be adjusted by changing the shift frequency amount of first via optical signal.The invention also discloses a kind of RF hopping signal generation device based on circulating frequency shift.The bandwidth range of Frequency Hopping Signal can be improved in the present invention, realizes high-speed frequency-hopping, and Frequency Hopping Signal centre frequency and frequency hopping speed are controllable.
Description
Technical field
The present invention relates to a kind of RF hopping signal generating method more particularly to it is a kind of using microwave photon technology realize
RF hopping signal generating method and device.
Background technique
Frequency Hopping Signal is a kind of spread spectrum mode, there is good Anti-Jamming, is being communicated, in radar and electronic warfare system
Important role.In a communications system, message capacity and anti-interference ability can be improved in frequency hopping；In radar system,
The big time-bandwidth product (Time-Bandwidth Product, TBWP) of Frequency Hopping Signal can increase detection range, improve distance
Resolution ratio.Currently, the Frequency Hopping Signal that conditional electronic method generates, because being limited to electronic bottleneck, bandwidth it is small (GHz once), it is fast
Spend slow (for the kHz order of magnitude).With the development of microwave photon technology, the method for generating RF hopping signal in the optical domain is mentioned
Out.Microwave sweep signal can be generated by a distributed Bragg reflector laser or two distributed feedback lasers
Two wavelength it is different photo-beat frequency generate.But the line width of light increases in frequency sweep, so that the quality of the radiofrequency signal generated becomes
Difference.Simultaneously there are also space and time mapping method, reflection method when frequency.Li Wangzhe et al. exists " Frequency-hopping microwave
waveform generation based on a frequency-tunable optoelectronic oscillator"
(Li,Wangzhe,Weifeng Zhang,and Jianping Yao."Frequency-hopping microwave
waveform generation based on a frequency-tunable optoelectronic oscillator."
Optical FiberCommunication Conference.Optical Societyof America, 2014.) it is proposed in
Frequency Hopping Signal production method based on optical-electronic oscillator, frequency hopping speed reach 10MHz, and for TBWP up to 700, bandwidth is less than 10GHz.Week
It is abundant et al. in " Flexible frequency-hopping microwave generation by dynamic control
of optically injected semiconductor laser"(Zhou,Pei,et al."Flexible
frequency-hopping microwave generation by dynamic control of optically
Injected semiconductor laser. " IEEE Photonics Journal 8.6 (2016): 1-9.) pass through light in
Semiconductor Lasers produce the Frequency Hopping Signal that band is wider than 10GHz, and frequency hopping speed is 10MHz.
There is tremendous increase compared to traditional method for electrically using the Frequency Hopping Signal bandwidth that microwave photon technology generates.How into
One step expands bandwidth range still under study for action；Meanwhile how to realize high-speed frequency-hopping and control frequency hopping speed, also need further
Research.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of generations of RF hopping signal
The bandwidth range of Frequency Hopping Signal can be improved in method, realizes high-speed frequency-hopping, and Frequency Hopping Signal centre frequency and frequency hopping speed are controllable.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
Frequency is f by a kind of RF hopping signal generating method based on circulating frequency shiftcOptical signal be divided into two-way；It is right
First via optical signal obtains reference optical signal after carrying out shift frequency；Second road optical signal is converted into periodic light by photoswitch
Then light pulse signal is inputted circulating frequency shift module, and the following conditions is enabled to be met by pulse signal:
OrWherein T, τ are respectively the period of the light pulse signal, pulsewidth, TLFor light
The time required to taking a round in the loop of the circulating frequency shift module, N is the integer greater than 1, then from the circulating frequency shift module
Output light Frequency Hopping Signal；Beat frequency is carried out to get RF hopping signal is arrived to the smooth Frequency Hopping Signal and reference optical signal, and described
The centre frequency of RF hopping signal can be adjusted by changing the shift frequency amount of first via optical signal.
Preferably, the circulating frequency shift module includes:
Optical combiner, for the light pulse signal and the optical signal from optical splitter to be combined；
Double parallel MZ Mach-Zehnder is used by remaining parameter is identical but the radio frequency signals drive of phase by pi/2
In to institute's input optical signal carry out shift frequency, shift frequency amount be the radiofrequency signal frequency, the direction of shift frequency by double parallel Mach once
The bias state of Dare modulator determines；
Optical splitter, for the output signal of double parallel MZ Mach-Zehnder to be divided into two-way, all the way as described
The optical combiner is sent into the output of circulating frequency shift module all the way；
Optical filter is serially connected between optical combiner and optical splitter or connects the output in the circulating frequency shift module
End, for frequency in fc+ Δ f~fc+ N × Δ f optical signal is band logical, is f for frequencyc+ (N+1) × Δ f and frequencies above
Optical signal be band resistance.
It is further preferred that the circulating frequency shift module further includes that the light being serially connected between optical combiner and optical splitter is put
Big device.
Preferably, shift frequency, the double parallel are carried out to first via optical signal using double parallel MZ Mach-Zehnder
For MZ Mach-Zehnder by remaining parameter is identical but the radio frequency signals drive of phase by pi/2, shift frequency amount is radio frequency letter
Number frequency, the direction of shift frequency is determined by the bias state of double parallel MZ Mach-Zehnder.
Preferably, the photoswitch is MZ Mach-Zehnder, and the switch state of photoswitch passes through mach zhender tune
The bias state of device processed controls.
Following technical scheme can also be obtained according to identical invention thinking:
A kind of RF hopping signal generation device based on circulating frequency shift, comprising:
Light source is f for generating frequencycOptical signal；
First photo-coupler, for the optical signal of light source output to be divided into two-way；
Light shift frequency module obtains reference optical signal after carrying out shift frequency for the first via optical signal to light source output；
Photoswitch, for the second road optical signal of light source output to be converted to periodic light pulse signal；
Circulating frequency shift module, for carrying out circulating frequency shift to the light pulse signal with output light Frequency Hopping Signal, and with
Lower condition is met:OrWherein T, τ are respectively the period of the light pulse signal, arteries and veins
Width, TLThe time required to taking a round in the loop of the circulating frequency shift module for light, N is the integer greater than 1；
Second photo-coupler, for the reference optical signal and light Frequency Hopping Signal to be combined into all the way；
Photodetector is believed for output RF hopping after carrying out photoelectric conversion to the second photo-coupler output optical signal
Number.
Preferably, the circulating frequency shift module includes:
Optical combiner, for the light pulse signal and the optical signal from optical splitter to be combined；
Double parallel MZ Mach-Zehnder is used by remaining parameter is identical but the radio frequency signals drive of phase by pi/2
In to institute's input optical signal carry out shift frequency, shift frequency amount be the radiofrequency signal frequency, the direction of shift frequency by double parallel Mach once
The bias state of Dare modulator determines；
Optical splitter, for the output signal of double parallel MZ Mach-Zehnder to be divided into two-way, all the way as described
The optical combiner is sent into the output of circulating frequency shift module all the way；
Optical filter is serially connected between optical combiner and optical splitter or connects the output in the circulating frequency shift module
End, for frequency in fc+ Δ f~fc+ N × Δ f optical signal is band logical, is f for frequencyc+ (N+1) × Δ f and frequencies above
Optical signal be band resistance.
It is further preferred that the circulating frequency shift module further includes that the light being serially connected between optical combiner and optical splitter is put
Big device.
Preferably, the smooth shift frequency module is double parallel MZ Mach-Zehnder, the double parallel mach zhender tune
For device processed by remaining parameter is identical but the radio frequency signals drive of phase by pi/2, shift frequency amount is the frequency of the radiofrequency signal, shift frequency
Direction determined by the bias state of double parallel MZ Mach-Zehnder.
Preferably, the photoswitch is MZ Mach-Zehnder, and the switch state of photoswitch passes through mach zhender tune
The bias state of device processed controls.
Compared with prior art, technical solution of the present invention has the advantages that
One, the present invention breaches conventional method and limits the bandwidth of the signal of generation, and generated radio frequency letter can be improved
Number bandwidth, bandwidth is limited solely by the bandwidth of photodetector and optical filter.
Two, the present invention caused by Frequency Hopping Signal, frequency hopping speed be it is controllable, pass through change photoswitch open continue
Time, the gate cycle and light of photoswitch are in circulating frequency shift module around the time of a circle, so that it may change frequency hopping speed according to demand
Rate is, it can be achieved that high-speed frequency-hopping.
Detailed description of the invention
Fig. 1 is the basic structure schematic illustration of RF hopping signal generation device of the present invention；
Fig. 2 is a kind of preferred structure schematic diagram of circulating frequency shift module；
Fig. 3 is τ=TL, T=NTLWhen, the corresponding relationship signal between the RF hopping signal and clock signal waveform of generation
Figure, wherein top is RF hopping signal waveform, lower section is clock signal waveform, and τ is the duration that photoswitch is opened, namely
The time that light turns around in the loop, T are the opening period of photoswitch；
Fig. 4 (a), Fig. 4 (b) are the output waveform changed after the duration that photoswitch is opened, and wherein Fig. 4 (a) opens for light
The case where opening time shortens is closed, Fig. 4 (b) is the case where photoswitch opening time extends；
Fig. 5 (a), Fig. 5 (b) are the output waveform after the gate cycle for changing photoswitch, and wherein Fig. 5 (a) opens for photoswitch
The case where closed cycle phase extends, Fig. 5 (b) are the case where photoswitch gate cycle shortens；
Fig. 6 is TLThe waveform generated when=(N-1) τ, T=N τ, wherein the opening time of photoswitch is τ, and light is in the loop
Time around a circle is TL, the gate cycle of photoswitch is T；
Fig. 7 is TLThe waveform generated when=(N+1) τ, T=N τ, wherein the opening time of photoswitch is τ, and light is in the loop
Time around a circle is TL, the gate cycle of photoswitch is T.
Specific embodiment
In view of the deficiencies of the prior art, thinking of the invention is that light carrier is divided into two-way, carries out shift frequency, another way all the way
Light Frequency Hopping Signal is generated using the mutual cooperation of photoswitch and circulating frequency shift module, then by two paths of signals beat frequency, to obtain
The controllable RF hopping signal of bandwidth and centre frequency and frequency hopping rate greatly.
Specifically, the present invention is based on the RF hopping signal generating method of circulating frequency shift specifically includes the following steps: will
Frequency is fcOptical signal be divided into two-way；Reference optical signal is obtained after carrying out shift frequency to first via optical signal；By the second Lu Guangxin
Number periodic light pulse signal is converted to by photoswitch, light pulse signal is then inputted into circulating frequency shift module, and enable with
Lower condition is met:OrWherein T, τ are respectively the period of the light pulse signal, arteries and veins
Width, TLThe time required to taking a round in the loop of the circulating frequency shift module for light, N is the integer greater than 1, then from the circulation
Shift frequency module output light Frequency Hopping Signal；Beat frequency is carried out to the smooth Frequency Hopping Signal and reference optical signal to believe to get to RF hopping
Number, and the centre frequency of the RF hopping signal can be adjusted by changing the shift frequency amount of first via optical signal.
For the ease of public understanding, technical solution of the present invention is described in detail with reference to the accompanying drawing:
As shown in Figure 1, RF hopping signal generation device of the invention includes laser source, light shift frequency module, photoswitch, follows
Ring shift frequency module, photodetector and two photo-couplers；The frequency that laser source is issued is fcOptical signal through first
Photo-coupler is divided into two-way, is sent into circulating frequency shift module by photoswitch all the way, and carry out by the clock signal to photoswitch
Control obtains light Frequency Hopping Signal, the reference optical signal of another way beat frequency as after after light shift frequency module shift frequency；With light electrical resistivity survey
It surveys device and beat frequency is carried out to light Frequency Hopping Signal and reference optical signal to get RF hopping signal is arrived, and the RF hopping signal
Centre frequency can be adjusted by changing the shift frequency amount of first via optical signal.
Above-mentioned smooth shift frequency module can use existing various smooth frequency shift techniques, such as most common acousto-optic modulator, but
It is preferred that using the light frequency shift schemes based on double parallel MZ Mach-Zehnder, the double parallel MZ Mach-Zehnder is by it
Remaining parameter is identical but the radio frequency signals drive of phase by pi/2, and shift frequency amount is the frequency of the radiofrequency signal, the direction of shift frequency by
The bias state of double parallel MZ Mach-Zehnder determines.Shift frequency, such method shift frequency are carried out compared to acousto-optic modulator
Frequency it is bigger, the shift frequency range of acousto-optic modulator is in MHz magnitude, and the method shift frequency range is in GHz.
Circulating frequency shift module used in the present invention, as shown in Fig. 2, being includes double parallel MZ Mach-Zehnder
(DPMZM), a loop of optical combiner, optical splitter, optical filter, in addition, in order to compensate for the loss that modulation generates, in institute
It states and is additionally provided with image intensifer in loop.
The process basic principle that lower branch generates light Frequency Hopping Signal is specific as follows:
Photoswitch in the present embodiment increases Dare modulator (MZM) by Mach and constitutes, when MZM only has direct current biasing,
Output is EMZM=cos φ Ein, control clock signal, make φ 0 withTwo points alternately change, and switching function can be realized, when
So, other existing photoswitches can also be used.After opening photoswitch, frequency fcOptical signal enter in loop that (input light is), the phase for controlling the Dc bias of DPMZM and two radiofrequency signals of load can inhibit light
Single Side Band With Carrier (CS-SSB) modulation.The radio frequency signal frequency of the two prevention at radio-frequency port load of DPMZM is identical, and 90 ° of phase phase difference, if
Road load thereon is cosine signal, and lower road load is sinusoidal signal, the output of the road Ze Shang are as follows:
Road Dc bias in adjusting, so thatAccording to small signal approximation, get back:
Similarly, the output signal on lower road is obtained:
Third direct current biasing is adjusted again, makes two-way difference phase shift up and downWithThe output of entire DPMZM are as follows:
Thereby realize CS-SSB.This namely above-mentioned light frequency shift schemes based on double parallel MZ Mach-Zehnder
Basic principle.
MeetingWhen, if light in the loop around one circle time be τ, in order not to allow light front and light
Tail portion interfere, the opening time for needing to control photoswitch is also τ.Then after by the n τ time, light fieldFind out to have obtained light Frequency Hopping Signal from the formula, Hopping frequencies areIn order to
Guarantee that the power for generating signal is certain, (such as erbium-doped fiber amplifier (EDFA) or is partly led in loop comprising image intensifer
Body image intensifer (SOA)), the light loss of every revolution is compensated.[f is set by the stopband section of optical filterc+(N+
1) Δ f ,+∞), then the maximum frequency that can pass through is fc+ N Δ f, the circular time is T=N τ in the loop.By time T
Afterwards, so opening photoswitch, original optical signal will be made to be again introduced into loop, it can be seen that light there is no signal in optical path
The switch periods of switch are T.Obtained light Frequency Hopping Signal and reference optical signal are closed into beam, Etot=Ein+Eloop, it is re-fed into PD bat
Frequently:
Photodetector only exports AC compounent.It is therefore seen that this method generates in a cycle, frequency is followed successively by Δ f,
The Frequency Hopping Signal of 2 Δ f ..., N Δ f, as shown in Figure 3.Because the frequency of upper branch reference light can be tuned through light shift frequency module,
So the centre frequency of obtained RF hopping signal is also tunable.
If we change the duration of photoswitch opening, when decreased duration, then within the τ time, light cannot fill
Full entire loop, so shown in obtained waveform such as Fig. 4 (a)；When duration extension, then the front and tail portion of light occur mixed
It is folded, so shown in obtained waveform such as Fig. 4 (b).If we change the gate cycle of photoswitch, when the period is elongated, the last week
The optical signal of phase and the optical signal in latter period cannot be stitched together, as shown in Fig. 5 (a)；When shortening in the period, previous cycle
Aliasing occurs for optical signal and the optical signal in latter period, as shown in Fig. 5 (b).On this basis, we hold photoswitch opening
Continuous time, the gate cycle of photoswitch and light are controlled in circulating frequency shift module around the time of a circle, so that it may obtain frequency hopping
The faster Frequency Hopping Signal of speed.
Change the opening time of photoswitch, if it is τ, light is in the loop T around the time of a circleL, the opening and closing of photoswitch
Period is T, and following relationship is met between this three:At this point it is possible to the holding in a certain frequency by signal
The continuous time is reduced to the 1/N of the above method, and the speed of frequency hopping is faster.
Work as TLWhen=(N-1) τ, due to TL< T, so in time interval (TL,TL+ τ) it is inner, it may appear that complete the of shift frequency
One light pulse, in TL+ τ moment (namely T moment), second light pulse enter circulating frequency shift module, at this moment first and
Second light pulse carries out shift frequency again, and after shift frequency is completed in second light pulse, third light pulse enters circulating frequency shift module,
And so on, the bandwidth range of filter is set, frequency is greater than fcThe light of+N Δ f can not pass through, and can generate frequency and subtract
Small light Frequency Hopping Signal, whole process is as shown in fig. 6, then the combiner with upper road, feeding PD beat frequency can generate frequency
Reduced RF hopping signal.Work as TLWhen=(N+1) τ, process is similar with above situation, and process is as shown in fig. 7, can produce
The RF hopping signal that frequency increases.
Claims (10)
1. a kind of RF hopping signal generating method based on circulating frequency shift, which is characterized in that by frequency be fcOptical signal be divided into
Two-way；Reference optical signal is obtained after carrying out shift frequency to first via optical signal；Second road optical signal is converted into week by photoswitch
Then light pulse signal is inputted circulating frequency shift module, and the following conditions is enabled to be met by the light pulse signal of phase property:
OrWherein T, τ are respectively the period of the light pulse signal, pulsewidth, TLIt is light in institute
It states the time required to taking a round in the loop of circulating frequency shift module, N is the integer greater than 1, then exports from the circulating frequency shift module
Light Frequency Hopping Signal；Beat frequency is carried out to the smooth Frequency Hopping Signal and reference optical signal to get RF hopping signal, and the radio frequency is arrived
The centre frequency of Frequency Hopping Signal can be adjusted by changing the shift frequency amount of first via optical signal.
2. the RF hopping signal generating method based on circulating frequency shift as described in claim 1, which is characterized in that the circulation is moved
Frequency module includes:
Optical combiner, for the light pulse signal and the optical signal from optical splitter to be combined；
Double parallel MZ Mach-Zehnder, by remaining parameter is identical but the radio frequency signals drive of phase by pi/2, for pair
Institute's input optical signal carries out shift frequency, and shift frequency amount is the frequency of the radiofrequency signal, and the direction of shift frequency is by double parallel mach zhender
The bias state of modulator determines；
Optical splitter is used as the circulation for the output signal of double parallel MZ Mach-Zehnder to be divided into two-way all the way
The optical combiner is sent into the output of shift frequency module all the way；
Optical filter is serially connected between optical combiner and optical splitter or connects the output end in the circulating frequency shift module,
For frequency in fc+ Δ f~fc+ N × Δ f optical signal is band logical, is f for frequencycThe light of+(N+1) × Δ f and frequencies above
Signal is band resistance.
3. the RF hopping signal generating method based on circulating frequency shift as claimed in claim 2, which is characterized in that the circulation is moved
Frequency module further includes the image intensifer being serially connected between optical combiner and optical splitter.
4. the RF hopping signal generating method based on circulating frequency shift as described in claim 1, which is characterized in that use double parallel
MZ Mach-Zehnder to carry out shift frequency to first via optical signal, and the double parallel MZ Mach-Zehnder is by remaining parameter
Identical but phase by pi/2 radio frequency signals drives, shift frequency amount are the frequency of the radiofrequency signal, and the direction of shift frequency is by double parallel
The bias state of MZ Mach-Zehnder determines.
5. the RF hopping signal generating method based on circulating frequency shift as described in claim 1, which is characterized in that the photoswitch
Switch state for MZ Mach-Zehnder, photoswitch is controlled by the bias state of MZ Mach-Zehnder.
6. a kind of RF hopping signal generation device based on circulating frequency shift characterized by comprising
Light source is f for generating frequencycOptical signal；
First photo-coupler, for the optical signal of light source output to be divided into two-way；
Light shift frequency module obtains reference optical signal after carrying out shift frequency for the first via optical signal to light source output；
Photoswitch, for the second road optical signal of light source output to be converted to periodic light pulse signal；
Circulating frequency shift module, for carrying out circulating frequency shift to the light pulse signal with output light Frequency Hopping Signal, and following item
Part is met:OrWherein T, τ are respectively the period of the light pulse signal, pulsewidth, TL
The time required to taking a round in the loop of the circulating frequency shift module for light, N is the integer greater than 1；
Second photo-coupler, for the reference optical signal and light Frequency Hopping Signal to be combined into all the way；
Photodetector, for exporting RF hopping signal after carrying out photoelectric conversion to the second photo-coupler output optical signal.
7. the RF hopping signal generation device based on circulating frequency shift as claimed in claim 6, which is characterized in that the circulation is moved
Frequency module includes:
Optical combiner, for the light pulse signal and the optical signal from optical splitter to be combined；
Double parallel MZ Mach-Zehnder, by remaining parameter is identical but the radio frequency signals drive of phase by pi/2, for pair
Institute's input optical signal carries out shift frequency, and shift frequency amount is the frequency of the radiofrequency signal, and the direction of shift frequency is by double parallel mach zhender
The bias state of modulator determines；
Optical splitter is used as the circulation for the output signal of double parallel MZ Mach-Zehnder to be divided into two-way all the way
The optical combiner is sent into the output of shift frequency module all the way；
Optical filter is serially connected between optical combiner and optical splitter or connects the output end in the circulating frequency shift module,
For frequency in fc+ Δ f~fc+ N × Δ f optical signal is band logical, is f for frequencycThe light of+(N+1) × Δ f and frequencies above
Signal is band resistance.
8. the RF hopping signal generation device based on circulating frequency shift as claimed in claim 7, which is characterized in that the circulation is moved
Frequency module further includes the image intensifer being serially connected between optical combiner and optical splitter.
9. the RF hopping signal generation device based on circulating frequency shift as claimed in claim 6, which is characterized in that the smooth shift frequency
Module is double parallel MZ Mach-Zehnder, and the double parallel MZ Mach-Zehnder is by remaining parameter is identical but phase phase
The radio frequency signals drive of poor pi/2, shift frequency amount are the frequency of the radiofrequency signal, and the direction of shift frequency is by double parallel mach zhender tune
The bias state of device processed determines.
10. the RF hopping signal generation device based on circulating frequency shift as claimed in claim 6, which is characterized in that the light is opened
Closing is MZ Mach-Zehnder, and the switch state of photoswitch is controlled by the bias state of MZ Mach-Zehnder.
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| CN111965621A (en) * | 2020-09-04 | 2020-11-20 | 南京航空航天大学 | Method and device for generating radio frequency multi-chirp linear frequency modulation stepping signals |
| CN113556179A (en) * | 2021-07-21 | 2021-10-26 | 南京航空航天大学 | W-band broadband signal generation method and device based on time-frequency splicing |
| CN114337731A (en) * | 2021-11-30 | 2022-04-12 | 中国科学院半导体研究所 | Optical frequency hopping communication system and method |
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