CN204349204U - For control device and the optical-electronic oscillator control system of optical-electronic oscillator - Google Patents
For control device and the optical-electronic oscillator control system of optical-electronic oscillator Download PDFInfo
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- CN204349204U CN204349204U CN201420555413.1U CN201420555413U CN204349204U CN 204349204 U CN204349204 U CN 204349204U CN 201420555413 U CN201420555413 U CN 201420555413U CN 204349204 U CN204349204 U CN 204349204U
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Abstract
The utility model discloses a kind of control device for optical-electronic oscillator and optical-electronic oscillator control system.Wherein, control device comprises: phase shifter, is connected with injection source, for carrying out phase shift to secondary signal; Collecting unit, is connected with the output of optical-electronic oscillator, the feedback signal that the output signal for gathering optical-electronic oscillator is coupled out; Frequency mixer, is connected with collecting unit respectively with phase shifter, for carrying out phase demodulation to the secondary signal after phase shift and feedback signal; Servo module, is connected with optical-electronic oscillator respectively with frequency mixer, for the PGC demodulation of the output signal according to the signal controlling optical-electronic oscillator after phase demodulation in secondary signal.By the utility model, solve the problem that in prior art, the long-time stability of optical-electronic oscillator are low, reach the effect that control OEO outputs signal long-time stability.
Description
Technical field
The utility model relates to photoelectric field, in particular to a kind of control device for optical-electronic oscillator and optical-electronic oscillator control system.
Background technology
Overstable oscillation device is the core of electronic communication system.High-quality microwave oscillator plays an important role in directions such as optical communication, satellite communication, microwave communication and high-acruracy surveys.Traditional microwave source generally obtain by the many times frequency multiplication of crystal oscillator, but along with the increase of frequency multiplication number of times, make an uproar mutually (short-term stability) can be increasing, and that is, making an uproar mutually increase along with the increase of carrier frequency.Optical-electronic oscillator (Opto-Electronic Oscillator, referred to as OEO) utility model solve this problem, making an uproar mutually of OEO based on fiber delay time does not increase with the rising of frequency of oscillation, be overstable microwave, millimeter wave oscillation source high-quality alternative.Its general principle is: the continuous light that laser sends is transmitted through the fiber to photodetector front end through electrooptic modulator by after oscillator signal intensity modulated, photodetector is converted to the signal of telecommunication modulated optical signal, then through frequency-selecting, amplification, finally feed back to modulator electrical input, and then circulate next time, the frequency meeting Barkhausen oscillation condition (open-loop gain is greater than 1, and difference is the integral multiple of 2 π) finally forms stable oscillator signal.
When other device performance index is constant, making an uproar mutually of OEO and square being inversely proportional to of fiber delay time amount.Optical fiber is longer, makes an uproar mutually lower, but free spectral limit can more and more less (the free spectral limit that 1km SMF optical fiber is corresponding be about 200kHz), the narrow band filter of high q-factor like this cannot be found effectively to suppress the spuious of oscillator signal at microwave frequency band.Injection locking mode is adopted to be suppress spuious effective means: to adopt the microwave signal injection long optical fibers ring OEO that stable, control Injection Signal frequency, certain pattern respective frequencies when allowing it vibrate separately with long optical fibers ring OEO is consistent, this mode signal of long optical fibers ring OEO can be allowed to get the mastery in " mode competition ", and then suppress other pattern, finally realize single-mode output.
Because the temperature susceplibility of glass communications optical fiber is higher, along with the amount of delay of stable change optical fiber also can change thereupon, the frequency of oscillator signal can be drifted about, moreover, other external disturbance all can destroy its long-time stability, causes the long-time stability of optical-electronic oscillator low.Current Domestic generally adopts the long-time stability of the mode control OEO of thermostatic control and damping outward, and this kind of mode structure is numerous and diverse and consume energy larger; Also have part researcher to adopt to fluctuate the mode compensated to fiber delay time in area of light.
For the problem that the long-time stability of optical-electronic oscillator in prior art are low, at present effective solution is not yet proposed.
Utility model content
Main purpose of the present utility model is to provide a kind of control device for optical-electronic oscillator and optical-electronic oscillator control system, to solve the problem that in prior art, the long-time stability of optical-electronic oscillator are low.
To achieve these goals, according to an aspect of the utility model embodiment, a kind of control device for optical-electronic oscillator is provided.Wherein, optical-electronic oscillator is connected with injection source, and injection source is used for exporting the first signal to optical-electronic oscillator, and export secondary signal, comprise according to the control device for optical-electronic oscillator of the present utility model: phase shifter, be connected with injection source, for carrying out phase shift to secondary signal; Collecting unit, is connected with the output of optical-electronic oscillator, the feedback signal that the output signal for gathering optical-electronic oscillator is coupled out; Frequency mixer, is connected with collecting unit respectively with phase shifter, for carrying out phase demodulation to the secondary signal after phase shift and feedback signal; Servo module, is connected with optical-electronic oscillator respectively with frequency mixer, for the PGC demodulation of the output signal according to the signal controlling optical-electronic oscillator after phase demodulation in secondary signal.
Further, optical-electronic oscillator is built-in with voltage-controlled phase shifter, and servo module is connected with voltage-controlled phase shifter, and servo module controls the PGC demodulation of the output signal of optical-electronic oscillator in secondary signal for the voltage by changing voltage-controlled phase shifter.
Further, servo module is also for carrying out amplification process to the signal after phase demodulation, and the voltage fluctuation size controlling the feedback signal after phase demodulation just covers the phase shift range of voltage-controlled phase shifter 0-360 degree.
Further, control device also comprises: the first microwave amplifier, is connected between phase shifter and frequency mixer, for carrying out amplification process to the secondary signal after phase shift; Second microwave amplifier, is connected between collecting unit and frequency mixer, for carrying out amplification process to feedback signal.
Further, control device also comprises: low pass filter, is connected between frequency mixer and servo module, for carrying out low-pass filtering to the signal after phase demodulation.
Further, phase shifter is 90 degree to the angle of secondary signal phase shift.
To achieve these goals, according to the another aspect of the utility model embodiment, provide a kind of optical-electronic oscillator control system.Comprise according to optical-electronic oscillator control system of the present utility model: inject source, for exporting the first signal and secondary signal; Optical-electronic oscillator, is connected with injection source, for receiving the first signal, and is outputed signal by the first signal; Control device, control device is the above-mentioned control device provided, and is connected respectively with optical-electronic oscillator with injection source, for controlling the PGC demodulation of output signal in secondary signal.
Further, optical-electronic oscillator comprises the first optical-electronic oscillator and the second optical-electronic oscillator, the output of the first optical-electronic oscillator is connected with the input of the second optical-electronic oscillator, control device comprises first control device and second control device, wherein, first control device is connected with the first optical-electronic oscillator respectively with injection source, for controlling the PGC demodulation of the output signal of the first optical-electronic oscillator in secondary signal; First control device is connected with the second optical-electronic oscillator respectively with the output of the first optical-electronic oscillator, for controlling the output signal of PGC demodulation at the first optical-electronic oscillator of the output signal of the second optical-electronic oscillator.
According to the utility model embodiment, the signal injecting source is divided into two parts, a part injects OEO, its single-mode output is ensured while guarantee OEO oscillator signal Low phase noise (short-term stability), another part is as reference signal, output signal long-time stability by mixing phase demodulation control OEO, thus solve the problem that in prior art, the long-time stability of optical-electronic oscillator are low, reach the effect that control OEO outputs signal long-time stability.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model, for explaining the utility model, is not formed improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 is the schematic diagram of the control device for optical-electronic oscillator according to the utility model embodiment; And
Fig. 2 is the schematic diagram of a kind of optical-electronic oscillator control system according to the utility model embodiment.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the utility model in detail in conjunction with the embodiments.
The utility model scheme is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the embodiment of the utility model part, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the utility model protection.
It should be noted that, term " first ", " second " etc. in specification of the present utility model and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiment of the present utility model described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those components and parts that the system of a series of components and parts, product or equipment are not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other components and parts of these systems, product or equipment.
The utility model embodiment provides a kind of control device for optical-electronic oscillator.This control device may be used for optical-electronic oscillator, can be the optical-electronic oscillator once injecting microwave source, also can enter the optical-electronic oscillator of microwave source by secondary injection.
Fig. 1 is the schematic diagram of the control device for optical-electronic oscillator according to the utility model embodiment.As shown in Figure 1, optical-electronic oscillator 20 is connected with injection source 10, this optical-electronic oscillator 20 can be long optical fibers ring OEO, injection source 10 is for exporting the first signal to optical-electronic oscillator 20, and export secondary signal, wherein, the signal that this injection source 10 exports is divided into two parts, a part i.e. the first signal realizes the injection locking to long optical fibers ring OEO, and another part and secondary signal carry out phase demodulation as the output signal of stable reference signal and OEO output signal and fiber optic loop.
As shown in Figure 1, control device comprises phase shifter 301, collecting unit (not shown), frequency mixer 302 and servo module 303.Phase shifter 301 is connected with injection source 10, for carrying out phase shift to secondary signal.Collecting unit is connected by the output of port 2 with optical-electronic oscillator 20, outputs signal for gathering optical-electronic oscillator 20 feedback signal be coupled out.Frequency mixer 302 is connected with collecting unit respectively with phase shifter 301, for carrying out phase demodulation to the secondary signal after phase shift and feedback signal; Servo module 303 is connected with optical-electronic oscillator 20 respectively with frequency mixer 302, for the PGC demodulation of the output signal according to the signal controlling optical-electronic oscillator 20 after phase demodulation in secondary signal.
Preferably, this phase shifter is used for secondary signal being carried out 90 degree of phase shifts, so that carry out phase demodulation process by frequency mixer to it.Then, voltage signal after phase demodulation can be fed back to the voltage controling end of the voltage-controlled phase shifter in OEO ring, controlled the phase place of output signal by the phase in-migration of voltage-controlled phase shifter, until output signal is synchronous with reference signal and secondary signal, finally obtain stable output signal.Preferably, servo module major function comprises two parts, a part realizes amplifying to voltage signal faint in the signal after phase demodulation, the voltage of another part to the feedback in the signal after phase demodulation manages, and ensures that its value fluctuation size just covers the phase shift range of voltage-controlled phase shifter 0-360 degree in OEO ring.
According to the utility model embodiment, the signal injecting source is divided into two parts, a part injects OEO, its single-mode output is ensured while guarantee OEO oscillator signal Low phase noise (short-term stability), another part is as reference signal, output signal long-time stability by mixing phase demodulation control OEO, thus solve the problem that in prior art, the long-time stability of optical-electronic oscillator are low, reach the effect that control OEO outputs signal long-time stability.
Compared with traditional OEO control device for stability, the utility model signal processing is all carried out in electrical domain, overcomes the complexity of area of light control system and has higher control precision.
Preferably, optical-electronic oscillator 20 is built-in with voltage-controlled phase shifter, and servo module 303 is connected with voltage-controlled phase shifter, and this servo module 303 controls the PGC demodulation of the output signal of optical-electronic oscillator in secondary signal for the voltage by changing voltage-controlled phase shifter.Servo module 303 controls the phase place outputed signal by the voltage changing voltage-controlled phase shifter, finally make the PGC demodulation outputed signal in reference signal, realizes stable output.
Preferably, control device also comprises: the first microwave amplifier 304, is connected between phase shifter 301 and frequency mixer 302, for carrying out amplification process to the secondary signal after phase shift; Second microwave amplifier 305, is connected between collecting unit and frequency mixer 302, for carrying out amplification process to feedback signal.
Particularly, the first microwave amplifier is for amplifying reference signal (secondary signal), and the second microwave amplifier, for amplifying feedback signal, makes frequency mixer reach capacity, and suppresses the amplitude noise of frequency mixer.
Preferably, control device also comprises: low pass filter 306, is connected between frequency mixer 302 and servo module 303, for carrying out low-pass filtering to the signal after phase demodulation.Adopt the baseband signal after low pass filter 306 pairs of phase demodulations to realize low-pass filtering, suppress the high fdrequency component after mixing.
Particularly, phase shifter is used for Reference Signal and secondary signal carries out 90 degree of phase shifts, realizes the object of mixing phase demodulation; Microwave amplifier, for amplifying reference signal and feedback signal, makes frequency mixer reach capacity, and suppresses the amplitude noise of frequency mixer; Employing frequency mixer realizes the microwave reference source after 90 degree of phase shifts and feedback signal phase demodulation; Adopt low pass filter to realize low-pass filtering to the baseband signal after phase demodulation, suppress the high fdrequency component after mixing; Servo module major function comprises two parts, and a part realizes amplifying to faint voltage signal, and the voltage of another part to feedback manages, and ensures that its value fluctuation size just covers the phase shift range of voltage-controlled phase shifter 0-360 degree in OEO ring.
Inject source signal and be divided into two parts, a part, by the phase shifter of port one connection control device, realizes 90 degree of phase shifts; Another part injects long optical fibers ring OEO, injection locking is carried out to one of them oscillation mode, suppresses the growth of other pattern, realize Low phase noise single-mode output, output signal is coupled out partial feedback signal, is connected with the frequency mixer of control device for stability by port 2.Two-way orthogonal signalling realize phase demodulation at frequency mixer, after low pass filter, feedback signal is amplified in servo module, be connected with the voltage-controlled phase shifter in long optical fibers ring by port 3 after adjustment, the phase place outputed signal is controlled by the voltage changing phase shifter, finally make the PGC demodulation outputed signal in reference signal, realize stable output.
From structure, the control device involved by the utility model can be considered three port devices, and port one connects reference signal, and port 2 connects feedback signal, and port 3 connects the built-in voltage-controlled phase shifter of long optical fibers ring OEO as output port.
The utility model embodiment this provide a kind of optical-electronic oscillator control system.This optical-electronic oscillator control system comprises: inject source, optical-electronic oscillator and control device.
Injection source is for exporting the first signal and secondary signal.Optical-electronic oscillator is connected with injection source, for receiving the first signal, and is outputed signal by the first signal.The control device of control device for providing in the utility model above-described embodiment, this control device is connected with optical-electronic oscillator respectively with injection source, for controlling the PGC demodulation of output signal in secondary signal.
Particularly, the operation principle of the control system of the utility model embodiment can see in above-described embodiment to the description of control device, do not repeat here.
According to the utility model embodiment, the signal injecting source is divided into two parts, a part injects OEO, its single-mode output is ensured while guarantee OEO oscillator signal Low phase noise (short-term stability), another part is as reference signal, output signal long-time stability by mixing phase demodulation control OEO, thus solve the problem that in prior art, the long-time stability of optical-electronic oscillator are low, reach the effect that control OEO outputs signal long-time stability.
Utilize this control device not only can control the stability of an injection locking OEO, and stability control can be realized to secondary, even more times injection locking OEO.
Fig. 2 is the schematic diagram of a kind of optical-electronic oscillator control system according to the utility model embodiment.As shown in Figure 2, optical-electronic oscillator comprises the first optical-electronic oscillator (i.e. long optical fibers ring OEO1) and the second optical-electronic oscillator (long optical fibers ring OEO2), the output of the first optical-electronic oscillator is connected with the input of the second optical-electronic oscillator, control device comprises first control device and second control device, wherein, first control device is connected with the first optical-electronic oscillator respectively with injection source, for controlling the PGC demodulation of the output signal of the first optical-electronic oscillator in secondary signal; First control device is connected with the second optical-electronic oscillator respectively with the output of the first optical-electronic oscillator, for controlling the output signal of PGC demodulation at the first optical-electronic oscillator of the output signal of the second optical-electronic oscillator.Wherein, the output signal of the second optical-electronic oscillator is final output signal.
Another embodiment as shown in Figure 2, adopts two control device (first control device and second control device) to realize controlling to the stability of secondary injection locking OEO.Making an uproar mutually that long optical fibers ring OEO outputs signal is relevant with making an uproar mutually of Injection Signal, and the Injection Signal more low more Low phase noise being more conducive to long optical fibers ring OEO of making an uproar mutually exports, and adopts repeatedly to inject and is intended to reduce making an uproar mutually of Injection Signal further.Secondary injection locking OEO structure is shown in Fig. 2, adopt and stablize injection source injection locking long optical fibers ring OEO1, in conjunction with a slice control device for stability, realize stable, single mode, Low phase noise secondary and inject source, then injection locking long optical fibers ring OEO2, finally realizes stablizing in conjunction with the second tablet stability control device, single mode, to make an uproar lower output signal mutually.
These are only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection range of the present utility model.
Claims (8)
1. for a control device for optical-electronic oscillator, it is characterized in that, described optical-electronic oscillator is connected with injection source, and described injection source is used for exporting the first signal to described optical-electronic oscillator, and exports secondary signal, and wherein, described control device comprises:
Phase shifter, is connected with described injection source, for carrying out phase shift to described secondary signal;
Collecting unit, is connected with the output of described optical-electronic oscillator, the feedback signal that the output signal for gathering described optical-electronic oscillator is coupled out;
Frequency mixer, is connected with described collecting unit respectively with described phase shifter, for carrying out phase demodulation to the secondary signal after described phase shift and described feedback signal;
Servo module, is connected with described optical-electronic oscillator respectively with described frequency mixer, for the PGC demodulation of the output signal of optical-electronic oscillator according to the signal controlling after described phase demodulation in described secondary signal.
2. control device according to claim 1, it is characterized in that, described optical-electronic oscillator is built-in with voltage-controlled phase shifter, described servo module is connected with described voltage-controlled phase shifter, and described servo module controls the PGC demodulation of the output signal of described optical-electronic oscillator in described secondary signal for the voltage by changing described voltage-controlled phase shifter.
3. control device according to claim 2, it is characterized in that, described servo module is also for carrying out amplification process to the signal after phase demodulation, and the voltage fluctuation size controlling the feedback signal after phase demodulation just covers the phase shift range of described voltage-controlled phase shifter 0-360 degree.
4. control device according to claim 1, is characterized in that, described control device also comprises:
First microwave amplifier, is connected between described phase shifter and described frequency mixer, for carrying out amplification process to the secondary signal after described phase shift;
Second microwave amplifier, is connected between described collecting unit and described frequency mixer, for carrying out amplification process to described feedback signal.
5. control device according to claim 1, is characterized in that, described control device also comprises:
Low pass filter, is connected between described frequency mixer and described servo module, for carrying out low-pass filtering to the signal after described phase demodulation.
6. control device according to claim 1, is characterized in that, the angle of described phase shifter to described secondary signal phase shift is 90 degree.
7. an optical-electronic oscillator control system, is characterized in that, comprising:
Injection source, for exporting the first signal and secondary signal;
Optical-electronic oscillator, is connected with described injection source, for receiving described first signal, and is outputed signal by described first signal;
Control device, the control device of described control device according to any one of claim 1 to 6, is connected with described optical-electronic oscillator respectively with described injection source, for controlling the PGC demodulation of described output signal in described secondary signal.
8. optical-electronic oscillator control system according to claim 7, it is characterized in that, described optical-electronic oscillator comprises the first optical-electronic oscillator and the second optical-electronic oscillator, the output of described first optical-electronic oscillator is connected with the input of described second optical-electronic oscillator, described control device comprises first control device and second control device, wherein
Described first control device is connected with described first optical-electronic oscillator respectively with described injection source, for controlling the PGC demodulation of the output signal of described first optical-electronic oscillator in described secondary signal;
Described first control device is connected with described second optical-electronic oscillator respectively with the output of described first optical-electronic oscillator, for controlling the output signal of PGC demodulation at described first optical-electronic oscillator of the output signal of described second optical-electronic oscillator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420555413.1U CN204349204U (en) | 2014-01-27 | 2014-09-25 | For control device and the optical-electronic oscillator control system of optical-electronic oscillator |
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| CN2014100391217 | 2014-01-27 | ||
| CN201410039121.7A CN103794979A (en) | 2014-01-27 | 2014-01-27 | Stability control circuit for injection locking opto-electronic oscillator |
| CN201420555413.1U CN204349204U (en) | 2014-01-27 | 2014-09-25 | For control device and the optical-electronic oscillator control system of optical-electronic oscillator |
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| CN201410039121.7A Pending CN103794979A (en) | 2014-01-27 | 2014-01-27 | Stability control circuit for injection locking opto-electronic oscillator |
| CN201420555413.1U Withdrawn - After Issue CN204349204U (en) | 2014-01-27 | 2014-09-25 | For control device and the optical-electronic oscillator control system of optical-electronic oscillator |
| CN201410497708.2A Expired - Fee Related CN104242042B (en) | 2014-01-27 | 2014-09-25 | Control device and optical-electronic oscillator control system for optical-electronic oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242042A (en) * | 2014-01-27 | 2014-12-24 | 湖南工学院 | Control device for photoelectric oscillator and photoelectric oscillator control system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983846A (en) * | 2014-05-28 | 2014-08-13 | 北京邮电大学 | Weak signal detection method based on photoelectric oscillator |
| CN103996960B (en) * | 2014-05-30 | 2017-03-01 | 湖南工学院 | Oscillatory system |
| CN104767102B (en) * | 2015-04-29 | 2018-02-27 | 湖南工学院 | Optical-electronic oscillator |
| CN108183381A (en) * | 2018-01-16 | 2018-06-19 | 浙江大学 | A kind of high stable optical-electronic oscillator and its method using novel feedback controling mode |
| CN114244354B (en) * | 2021-12-21 | 2024-06-07 | 北京理工大学 | Quick start crystal oscillator based on secondary injection and digital frequency locking ring |
| CN115195069A (en) * | 2022-06-27 | 2022-10-18 | 佛山市南海区广工大数控装备协同创新研究院 | Universal data acquisition module and system for injection molding machine |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2361002C (en) * | 1999-01-28 | 2005-07-26 | California Institute Of Technology | Opto-electronic techniques for reducing phase noise in a carrier signal by carrier suppression |
| US6906309B2 (en) * | 2001-11-15 | 2005-06-14 | Hrl Laboratories, Llc | Injection-seeding of a multi-tone photonic oscillator |
| US7173749B2 (en) * | 2003-08-04 | 2007-02-06 | California Institute Of Technology | Opto-electronic feedback for stabilizing oscillators |
| CN103022857B (en) * | 2012-12-10 | 2015-03-25 | 贵州大学 | Highly-stable single-mode microwave optoelectronic oscillator |
| CN103794979A (en) * | 2014-01-27 | 2014-05-14 | 湖南工学院 | Stability control circuit for injection locking opto-electronic oscillator |
-
2014
- 2014-01-27 CN CN201410039121.7A patent/CN103794979A/en active Pending
- 2014-09-25 CN CN201420555413.1U patent/CN204349204U/en not_active Withdrawn - After Issue
- 2014-09-25 CN CN201410497708.2A patent/CN104242042B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242042A (en) * | 2014-01-27 | 2014-12-24 | 湖南工学院 | Control device for photoelectric oscillator and photoelectric oscillator control system |
| CN104242042B (en) * | 2014-01-27 | 2018-01-30 | 湖南工学院 | Control device and optical-electronic oscillator control system for optical-electronic oscillator |
Also Published As
| Publication number | Publication date |
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| CN103794979A (en) | 2014-05-14 |
| CN104242042B (en) | 2018-01-30 |
| CN104242042A (en) | 2014-12-24 |
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