CN102571144B - Optical-carrier ultra wideband radio signal generator with tunable frequency band - Google Patents
Optical-carrier ultra wideband radio signal generator with tunable frequency band Download PDFInfo
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Abstract
The invention relates to an optical-carrier ultra wideband radio signal generator with a tunable frequency band. The generator comprises a laser light source and a microwave sine signal source, wherein a port 1 of a 2*2 high-speed optical switch is connected with the laser light source; one end of an adjustable optical delay line is connected with a port 4 of the 2*2 high-speed optical switch; one end of an adjustable optical attenuator is connected with the other end of the adjustable optical delay line; an optical port 1 of a light intensity modulator is connected with a port 3 of the 2*2 high-speed optical switch; the port 1 of an optical coupler is connected with an optical port 2 of the light intensity modulator; the port 2 of the optical coupler is connected with the other end of the adjustable optical attenuator; the optical port 1 of a high-speed optical detector is connected with the port 3 of the optical coupler; one end of a low-pass filter is connected with an electric port 5 of the 2*2 high-speed optical switch; the port 2 of a code pattern generator is connected with the other end of the low-pass filter; the port 2 of a microwave power divider is connected with an electric port 3 of the light intensity modulator; the port 3 of the microwave power divider is connected with the port 1 of the code pattern generator; and the port of the microwave sine signal source is connected with the port 1 of the microwave power divider.
Description
Technical field
The invention belongs to the Microwave photonics field, say that more specifically the tunable light of a kind of frequency band based on high-speed optical switch carries the super wideband wireless electric signal generator.
Background technology
With respect to traditional narrow band communication, ultra broadband (UWB:Ultra-Wideband) technology has many excellent properties, as: low power consumption, anti-interference, anti-multipath fading, high-resolution, strong penetrability detection performance etc.Therefore, super-broadband tech is one of fighting technique of US military use always for many years.
In February, 2002, the FCC of FCC (FCC:Federal Communications Commission) has passed through one and has approved that super-broadband tech is used for the final regulation of civilian purposes.FCC has stipulated that three purposes of super-broadband tech are respectively: imaging system, automobile collision-proof transducer and RFDC and measuring system.According to the regulation of FCC, the super wideband wireless signal of telecommunication of 3.1GHz to 10.6GHz frequency band and 22GHz to 31GHz frequency band is used for radio communication and the automobile collision avoidance radar field is open.2004, European commission (EC) made regulation at super-broadband tech in the application aspect car radar: from 2013, the former UWB car radar general who works in the 24GHz frequency range was all replaced by the ULTRA-WIDEBAND RADAR of 77GHz to 81GHz frequency band.As seen, the radio ultra wide band system that works in each frequency range prospect that has a very wide range of applications.
frequency spectrum is plastic, the generation of the super wideband wireless signal of telecommunication that frequency band is adjustable, modulation not only can break with further application the mechanism such as FCC for avoiding system interference to the frequency spectrum control of UWB signal, make UWB system self good characteristic perform to ultimate attainment, more likely give and comprise cognitive radio (Cognitive Radio), wireless sense network (Wireless Sensor Networks), light-carried wireless electricity (Radio over Fiber) and intelligent adaptive radar (Knowledge-based adaptiveradar) in interior new scientific and trechnolocial undertaking in technological incorporation, new chance is brought in the aspects such as performance boost.
On the other hand, due to the transmission power limit of the super wideband wireless signal of telecommunication (power spectral density less than-41dBm) and the intersymbol interference problem under two-forty, the transmission range of radio ultra wide band system generally is restricted in the scope of several meters.In order to overcome this transmission range restriction of the super wideband wireless signal of telecommunication, people have proposed the concept that light carries ultra-broadband radio (UWB-over-fiber) in recent years, namely utilize the Optical Fiber Transmission super wideband wireless signal of telecommunication.The researcher is also attempting simultaneously directly producing the super wideband wireless signal of telecommunication in the light territory, and this technology can overcome the shortcomings that electric territory produces the super wideband wireless signal of telecommunication, such as having reduced unnecessary electric light conversion links, having overcome the limit bandwidth of electronic device etc.
The super wideband wireless signal of telecommunication has comprised the most frequently used form of two classes: pulse ultra-broad band radio and multi-band ultra-broadband radio, photoproduction super-broadband tech correspondingly has a variety of.The photon technology that produces the pulse ultra-broad band radio signal mainly contains following a few class: 1) utilize the non-linear modulation characteristic of optical modulator the base band Gaussian pulse directly to be converted to single order or the second order Gauss pulse in light territory; 2) utilize optical phase modulator and light frequency discriminator that the light signal after modulating through the base band Gaussian pulse is differentiated, thereby obtain single order or the second order Gauss pulse in light territory; 3) shaping is carried out in the output spectrum of mode-locked laser, then utilize the frequency-time mapping relations to obtain the pulse ultra-broad band radio signal; 4) utilize the pulse ultra-broad band radio signal of the relaxation oscillation effect generation higher-order of directly modulated laser.The common deficiency of said method is: 1) can't carry out the frequency band of the pulse ultra-broad band radio signal that produces tuning, therefore for 22GHz to 31GHz frequency band and more the application of high frequency band have larger restriction; 2) be difficult to produce the High Order Impulsive super wideband wireless signal of telecommunication, the signal spectrum that therefore produces is not the radiation mask regulation that extremely satisfies the federal committee of American Communications; 3) system is comparatively complicated, is difficult to realize that monolithic is integrated.
Produce present study less of photon technology of the multi-band super wideband wireless signal of telecommunication, mainly by following two kinds: a plurality of light pulses that 1) utilize the Cross polarization modulation in optical phase modulator to produce polarized orthogonal, thereby then utilize birefringece crystal that these light pulses are misplaced in time and produce the multi-band super wideband wireless signal of telecommunication, the shortcoming of this method is that system is very complicated, be difficult to integratedly, simultaneously can't carry out tuning flexibly to the frequency band of the signal that produces; 2) utilize Mach Ceng Deer (Mach-Zehnder) optical modulator in the multiple-frequency modulation characteristic at its maximum bias point place, directly produce the multi-band super wideband wireless signal of telecommunication, the shortcoming of this method is, contain larger harmonic frequency composition in its signal spectrum that produces, therefore will there be larger cross-interference issue in the signal for adjacent frequency bands.
In sum, existing smooth territory produces the super wideband wireless telecommunications and still has defective, and the radiation mask regulation, frequency band that meets the federal committee of American Communications in the urgent need to a kind of frequency spectrum at present be the tunable and generator that can produce the polytype super wideband wireless signal of telecommunication flexibly.
Summary of the invention
The object of the invention is to, provide the tunable light of a kind of frequency band to carry the super wideband wireless electric signal generator, it can solve existing light and carry super wideband wireless electric signal generator frequency band and be difficult to tuning, frequency spectrum and do not satisfy the radiation mask regulation of the American Communications federal committee and the problem that is difficult to produce the polytype super wideband wireless signal of telecommunication.
The tunable light of a kind of frequency band provided by the invention carries the super wideband wireless electric signal generator, comprising:
One LASER Light Source;
One 2 * 2 high-speed optical switches, the port one of this 2 * 2 high-speed optical switch is connected with LASER Light Source;
One variable optical delay line, an end of this variable optical delay line is connected with the port 4 of 2 * 2 high-speed optical switches;
One adjustable optical attenuator, an end of this adjustable optical attenuator is connected with the other end of variable optical delay line;
One light intensity modulator, the optical port 1 of this light intensity modulator is connected with the port 3 of 2 * 2 high-speed optical switches;
One optical coupler, the port one of this optical coupler is connected with the optical port of light intensity modulator 2, and the port 2 of this optical coupler is connected with the other end of adjustable optical attenuator, and the port 4 of this optical coupler carries the optical output port of super wideband wireless electric signal generator for light;
One high speed photodetector, the optical port 1 of this high speed photodetector is connected with the port 3 of optical coupler, and the electric port 2 of this high speed photodetector carries the electric output port of super wideband wireless electric signal generator for light;
One low pass filter, an end of this low pass filter is connected with the electric port 5 of 2 * 2 high-speed optical switches;
One pattern generator, the port 2 of this pattern generator is connected with the other end of low pass filter;
One microwave power distributor, the port 2 of this microwave power distributor is connected with the electric port 3 of light intensity modulator, and the port 3 of this microwave power distributor is connected with the port one of pattern generator;
One microwave sine signal source, the port of this microwave sine signal source is connected with the port one of microwave power distributor;
Wherein said LASER Light Source, 2 * 2 high-speed optical switches, variable optical delay line, adjustable optical attenuator, light intensity modulator, optical coupler and high speed photodetector interconnect with the discrete device form, or adopt the photonic semiconductor integrated technology to make photon integrated chip.
Can find out from technique scheme, the present invention has following beneficial effect:
The tunable light of this frequency band carries the super wideband wireless electric signal generator both can produce the pulse ultra-broad band radio signal, also can produce the multi-band super wideband wireless signal of telecommunication.
The tunable light of this frequency band carries the frequency band that the super wideband wireless electric signal generator produces the pulse ultra-broad band radio signal can be tuning arbitrarily.
The tunable light of this frequency band carries the requirement that frequency spectrum that the super wideband wireless electric signal generator produces the pulse ultra-broad band radio signal meets FCC's radiation mask (FCC Mask).
It is can monolithic integrated that the tunable light of this frequency band carries the super wideband wireless electric signal generator, thereby make this system more compact and realize miniaturization.
Description of drawings
In order to further illustrate structure of the present invention and feature, the present invention is described further below in conjunction with example and accompanying drawing, wherein:
Fig. 1 is that the tunable light of this frequency band carries super wideband wireless electric signal generator structural representation;
Fig. 2 a-Fig. 2 d is that the tunable light of this frequency band carries super wideband wireless electric signal generator structural representation operation principle schematic diagram;
Fig. 3 a-Fig. 3 c is time domain waveform and the frequency spectrum that the tunable light of this frequency band carries the pulse ultra-broad band radio signal of super wideband wireless electric signal generator generation;
Fig. 4 a-Fig. 4 c is time domain waveform and the frequency spectrum that the tunable light of this frequency band carries the multi-band super wideband wireless signal of telecommunication of super wideband wireless electric signal generator generation.
Embodiment
See also shown in Figure 1ly, the invention provides the tunable light of a kind of frequency band and carry the super wideband wireless electric signal generator, comprising:
One LASER Light Source a, centered by this LASER Light Source a, wavelength is the semiconductor laser light resource of 1550nm wave band or 1310nm wave band;
One 2 * 2 high-speed optical switch b, the port one of this 2 * 2 high-speed optical switch b is connected with LASER Light Source a, and this 2 * 2 high-speed optical switch b is made by GaAs, silicon materials or indium phosphate material;
One variable optical delay line c, the end of this variable optical delay line c is connected with the port 4 of 2 * 2 high-speed optical switch b;
One adjustable optical attenuator d, the end of this adjustable optical attenuator d is connected with the other end of variable optical delay line c;
One light intensity modulator e, the optical port 1 of this light intensity modulator e is connected with the port 3 of 2 * 2 high-speed optical switch b, and this light intensity modulator e is the once light intensity modulator of moral ear structure of Mach, or is the electroabsorption modulator of based semiconductor material;
One optical coupler f, the port one of this optical coupler f is connected with the optical port 2 of light intensity modulator e, the port 2 of this optical coupler f is connected with the other end of adjustable optical attenuator d, and the port 4 of this optical coupler f carries the optical output port of super wideband wireless electric signal generator for light;
One high speed photodetector g, the optical port 1 of this high speed photodetector g is connected with the port 3 of optical coupler f, described high speed photodetector g carries with light the super wideband wireless signal of telecommunication that the super wideband wireless signal of telecommunication is converted into electric territory, and the electric port 2 of this high speed photodetector g carries the electric output port of super wideband wireless electric signal generator for light;
one low pass filter j, the end of this low pass filter j is connected with the electric port 5 of 2 * 2 high-speed optical switch b, the cut-off frequency of described low pass filter j needs the different working modes that light tunable according to this frequency band carries the super wideband wireless electric signal generator to select, when the tunable light of this frequency band carries the super wideband wireless electric signal generator with pulse ultra-broad band radio signal work pattern, the cut-off frequency of this low pass filter j is 6GHz to 8GHz, when the tunable light of this frequency band carries the super wideband wireless electric signal generator and works with multi-band ultra-broadband radio signal mode, the cut-off frequency 1GHz of this low pass filter j,
The port 2 of one this pattern generator of pattern generator i i is connected with the other end of low pass filter j, this pattern generator i is in the process of coding, if the tunable light of this frequency band carries the super wideband wireless electric signal generator and works in pulse ultra-broad band radio signal pattern, coding " 11000 ... 0 " is data " 1 ", and coding " 00000 ... 0 " is data " 0 "; This pattern generator i is in the process of coding, if the tunable light of this frequency band carries the super wideband wireless electric signal generator and works in multi-band ultra-broadband radio signal mode, coding " 111 ... 11000 ... 0 " is data " 1 ", and coding " 00000 ... 0 " is data " 0 ";
One microwave power distributor k, the port 2 of this microwave power distributor k is connected with the electric port 3 of light intensity modulator e, and the port 3 of this microwave power distributor k is connected with the port one of pattern generator i;
One microwave sine signal source h, the port of this microwave sine signal source h is connected with the port one of microwave power distributor k, described microwave sine signal source h is the frequency-tunable microwave signal source, the frequency of described microwave sine signal source signal that h sends has determined that the tunable light of this frequency band carries the frequency band of the super wideband wireless signal of telecommunication that the super wideband wireless electric signal generator produces, and can produce the tunable light of frequency band by the signal frequency that changes this microwave sine signal source h and carry the super wideband wireless signal of telecommunication;
Wherein said LASER Light Source a, 2 * 2 high-speed optical switch b, variable optical delay line c, adjustable optical attenuator d, light intensity modulator e, optical coupler f and high speed photodetector g interconnect with the discrete device form, or adopt the photonic semiconductor integrated technology to make photon integrated chip.
This frequency band is tunable, and the ultra-broadband signal generator is essentially a high speed photon microwave switch, namely utilizes the method realization of photonic propulsion to the speed-sensitive switch function of microwave signal.The specific works principle is as follows: the laser that LASER Light Source a sends is modulated by 2 * 2 high-speed optical switch b, and modulation signal is produced by pattern generator i.The pattern that pattern generator i produces is synchronizeed with microwave sine signal source h, be achieved in that synchronously signal that microwave sine signal source h produces enters microwave power distributor k and shunts, wherein one road signal after shunting penetrates and enters the signal synchronous port 1 of pattern generator i from the port 3 of microwave power distributor k.The optical output port of 2 * 2 high-speed optical switch b has two: port 3 and port 4, both light signal patterns of output are opposite, as shown in Fig. 2 a and Fig. 2 c.For example, when the pattern of port 3 output of 2 * 2 high-speed optical switch b be " 01100000000 ", the pattern that port 4 is exported was " 10011111111 ".When being admitted to light intensity modulator e, modulates the light pulse signal of port 3 output of 2 * 2 high-speed optical switch b, modulation signal is a sinusoidal microwave signal, produced by microwave sine signal source h, through penetrate and send into the modulation port 3 of light intensity modulator after microwave power distributor k shunting by the port 2 of microwave power distributor k.When the light signal that enters light intensity modulator e was logical one, light signal was by the microwave sinusoidal signal modulation, and when light signal was logical zero, light signal strength was that " 0 " does not modulate generation.The light signal of port 2 outputs of light intensity modulator e is as shown in Fig. 2 b.The light signal of port 4 output of 2 * 2 high-speed optical switch b is through variable optical delay line c and adjustable optical attenuator d delays time and power is controlled, and guarantees that the light intensity of this light branch road and light time-delay are identical with the lower branch road at light intensity modulator e place.The light signal of up and down branch road closes ripple in optical coupler f, consisted of final light and carried the super wideband wireless signal of telecommunication, as shown in Fig. 2 d.The port 4 of optical coupler f carries the light output end of super wideband wireless electric signal generator for the tunable light of this frequency band, with the formal output of this super wideband wireless signal of telecommunication with light.The port 3 of optical coupler f is connected with the port one of high speed photodetector g, light carries the super wideband wireless signal of telecommunication that is converted into electric form after the super wideband wireless signal of telecommunication is surveyed through high speed photodetector g, therefore, the port 2 of high speed photodetector g carries the electric output of super wideband wireless electric signal generator for the tunable light of this frequency band.
The centre frequency that the tunable light of this frequency band carries the signal band that the super wideband wireless electric signal generator produces is consistent with the centre frequency of microwave sine signal source h, therefore, by the centre frequency of microwave sine signal source h, the tunable light of tuning this frequency band carries the frequency band of the signal that the super wideband wireless electric signal generator produces easily.
In practical application, the tunable light of this frequency band carries the super wideband wireless electric signal generator and has two kinds of mode of operations: 1) produce pulse ultra-broad band radio signal, 2) the generation multi-band super wideband wireless signal of telecommunication.If it is data " 1 " that pattern generator i coding " 11000 ... 0 " is set, coding " 00000 ... 0 " is data " 0 ", and the tunable light of this frequency band carries the super wideband wireless electric signal generator and produces the pulse ultra-broad band radio signal, as shown in Fig. 3 a-c; If it is data " 1 " that pattern generator i coding " 111 ... 11000 ... 0 " is set, coding " 00000 ... 0 " is data " 0 ", and the tunable light of this frequency band carries the super wideband wireless electric signal generator and produces the multi-band super wideband wireless signal of telecommunication, as shown in Fig. 4 a-c.
The pattern that pattern generator i produces is approximate rectangular electric pulse, and low pass filter j is shaped as approximate gaussian shape pulse with this electric pulse, is loaded in the electric port 5 of 2 * 2 high-speed optical switch b through the electric pulse pattern after low pass filter j shaping.The pulse ultra-broad band radio signal of exporting after process low pass filter j shaping is as shown in Fig. 3 b, as seen from the figure, the envelope of signal pulse is compared not the super wideband wireless signal of telecommunication (as shown in Fig. 3 a) exported through low pass filter j shaping more near gaussian shape.Therefore the frequency spectrum of this signal also more satisfies FCC's radiation mask (FCC Mask), as shown in Fig. 3 c.The multi-band super wideband wireless signal of telecommunication that Fig. 4 a produces for not passing through low pass filter j shaping, the multi-band super wideband wireless signal of telecommunication that Fig. 4 b produces for the shaping through low pass filter j, Fig. 4 c are that the final multi-band super wideband wireless signal of telecommunication that produces is at the frequency spectrum of a plurality of frequency ranges.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (5)
1. the tunable light of frequency band carries the super wideband wireless electric signal generator, comprising:
One LASER Light Source;
One 2 * 2 high-speed optical switches, the port one of this 2 * 2 high-speed optical switch is connected with LASER Light Source;
One variable optical delay line, an end of this variable optical delay line is connected with the port 4 of 2 * 2 high-speed optical switches;
One adjustable optical attenuator, an end of this adjustable optical attenuator is connected with the other end of variable optical delay line;
One light intensity modulator, the optical port 1 of this light intensity modulator is connected with the port 3 of 2 * 2 high-speed optical switches;
One optical coupler, the port one of this optical coupler is connected with the optical port of light intensity modulator 2, and the port 2 of this optical coupler is connected with the other end of adjustable optical attenuator, and the port 4 of this optical coupler carries the optical output port of super wideband wireless electric signal generator for light;
One high speed photodetector, the optical port 1 of this high speed photodetector is connected with the port 3 of optical coupler, and the electric port 2 of this high speed photodetector carries the electric output port of super wideband wireless electric signal generator for light;
One low pass filter, an end of this low pass filter is connected with the electric port 5 of 2 * 2 high-speed optical switches;
One pattern generator, the port 2 of this pattern generator is connected with the other end of low pass filter;
One microwave power distributor, the port 2 of this microwave power distributor is connected with the electric port 3 of light intensity modulator, and the port 3 of this microwave power distributor is connected with the port one of pattern generator;
One microwave sine signal source, the port of this microwave sine signal source is connected with the port one of microwave power distributor, and this microwave sine signal source is the frequency-tunable microwave signal source;
Wherein said LASER Light Source, 2 * 2 high-speed optical switches, variable optical delay line, adjustable optical attenuator, light intensity modulator, optical coupler and high speed photodetector interconnect with the discrete device form, or adopt the photonic semiconductor integrated technology to make photon integrated chip.
2. the tunable light of frequency band according to claim 1 carries the super wideband wireless electric signal generator, and wherein centered by LASER Light Source, wavelength is the semiconductor laser light resource of 1550nm wave band or 1310nm wave band.
3. the tunable light of frequency band according to claim 1 carries the super wideband wireless electric signal generator, and wherein 2 * 2 high-speed optical switches are made by GaAs, silicon materials or indium phosphate material.
4. the tunable light of frequency band according to claim 1 carries the super wideband wireless electric signal generator, and wherein light intensity modulator is the once light intensity modulator of moral ear structure of Mach, or is the electroabsorption modulator of based semiconductor material.
5. the tunable light of frequency band according to claim 1 carries the super wideband wireless electric signal generator, and wherein high speed photodetector carries with light the super wideband wireless signal of telecommunication that the super wideband wireless signal of telecommunication is converted into electric territory.
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| CN103166706B (en) * | 2013-02-05 | 2016-03-30 | 上海交通大学 | Based on the photoelectric oscillation device of the frequency-tunable of wide spectrum light source |
| CN108594479A (en) * | 2018-03-30 | 2018-09-28 | 张晗 | It is a kind of based on the full optical phase modulator of black phosphorus material and its application |
| CN109193318B (en) * | 2018-11-12 | 2020-04-21 | 中国科学院半导体研究所 | Up-down frequency conversion system based on mode-locked laser |
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| CN1835422A (en) * | 2006-04-18 | 2006-09-20 | 浙江大学 | Microwave photon down conversion method and device based on electrooptical modulator and optical fiber raster |
| CN101483483A (en) * | 2009-01-08 | 2009-07-15 | 浙江大学 | Method and apparatus for generating multi-frequency microwave signal source |
| CN102281107A (en) * | 2011-09-13 | 2011-12-14 | 大连理工大学 | Dispersion measuring device and method for fiber optical device |
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| CN1835422A (en) * | 2006-04-18 | 2006-09-20 | 浙江大学 | Microwave photon down conversion method and device based on electrooptical modulator and optical fiber raster |
| CN101483483A (en) * | 2009-01-08 | 2009-07-15 | 浙江大学 | Method and apparatus for generating multi-frequency microwave signal source |
| CN102281107A (en) * | 2011-09-13 | 2011-12-14 | 大连理工大学 | Dispersion measuring device and method for fiber optical device |
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