CN102769496A - Device and method for generating octuple-frequency optical millimeter waves - Google Patents
Device and method for generating octuple-frequency optical millimeter waves Download PDFInfo
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- CN102769496A CN102769496A CN2012102651991A CN201210265199A CN102769496A CN 102769496 A CN102769496 A CN 102769496A CN 2012102651991 A CN2012102651991 A CN 2012102651991A CN 201210265199 A CN201210265199 A CN 201210265199A CN 102769496 A CN102769496 A CN 102769496A
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Abstract
The invention discloses a device and a method for generating octuple-frequency optical millimeter waves in the field of optical communication. The device comprises an adjustable light source, a radio-frequency signal source, an electric amplifier, a Mach-Zehnder modulator and a delay interferometer, wherein an output end of the adjustable light source is connected with an optical input end of the Mach-Zehnder modulator, an output end of the radio-frequency signal source is connected with an input end of the electric amplifier, an output end of the electric amplifier is connected with a radio-frequency drive end of the Mach-Zehnder modulator, and an output end of the Mach-Zehnder modulator is connected with an input end of the delay interferometer. The method includes: reasonably setting a delay for delaying the delay interferometer and bias voltage and modulation depth of the Mach-Zehnder modulator. The device is simple in configuration, so that the cost of the system is reduced, and the requirements of the system on device bandwidth are lowered.
Description
Technical field
The present invention relates to optical communication field, relate in particular to a kind of apparatus and method that octonary light carries millimeter wave that produce.
Background technology
In recent years, along with the increase rapidly of number of mobile users, radio communication service transmits the business such as transfer of data, video playback that expanded to from speech, and transmission bandwidth has become restriction radio communication development key problem.On the other hand, though Fibre Optical Communication Technology provides magnanimity bandwidth and superelevation speed, its mobility is not enough.In view of the demand and development of the communication of following vast capacity ultrahigh speed,, will become a kind of effective solution in conjunction with the optical fiber-wireless communication system of optical fiber and wireless advantage.For optical fiber-wireless communication system, the high-frequency carrier wave can provide high modulation rate, can improve the system channel capacity then.Therefore, in optical fiber-wireless communication system, it is one of key technology that high-frequency light carries the millimeter wave generation.In recent years, both at home and abroad the researcher has proposed many light and has carried millimeter wave generating method, comprises that semiconductor laser is directly modulated, optics four wave mixing, the long-range extrapolation of optics, optics external modulation etc.Wherein, optics external modulation method can provide higher modulation bandwidth, and generation light carries millimeter wave and has little, the reliable and stable advantage of laser noise interference.
In traditional optical external modulation mode, generally only can produce and equate with frequency modulating signal or the light of twice carries millimeter wave.If the light that will produce such as higher frequencies such as 60GHz ~ 100GHz carries millimeter wave, then need the more modulation device of high bandwidth and the local oscillation signal of higher frequency.The radio-frequency signal source and the modulation device of commercialization are difficult to satisfy this requirement and at present.Therefore, carry millimeter-wave signal,, reduce system cost if can utilize low frequency local oscillation signal and the commercial modulation device of low bandwidth to produce high-frequency light improving the generation efficient that light carries millimeter wave effectively based on the method for multiple frequence.
Literature search through to prior art is found; People such as Jianxin Ma are at Optics Communications; 42 (2010): mention among the 64GHz optical millimeter-wave generation by octupling8GHz local oscillator via a nested LiNbO3 modulator that delivers on the 264-268 (" photon communication " 2010) (" the 8GHz local oscillation signal carries millimeter wave through the octonary light that nested Mach-Zehnder modulators produces 64GHz "), carry millimeter wave thereby bias voltage through controlling nested Mach-Zehnder modulators and sinusoidal local oscillator drive signal phase place produce octonary light.Yet this device need realize that optics is many through two nested two sub-modulators of Mach-Zehnder of three-dB coupler, and the insertion loss is bigger.In addition, this device need be divided into two sub-modulators that two-way drives nested Mach-Zehnder with sinusoidal local oscillation signal, and will accurately control the phase difference of the sinusoidal local oscillation signal of two-way, and whole device implements complicacy.
Summary of the invention
The present invention is directed to the deficiency of above-mentioned prior art, proposed a kind of octonary light simple in structure and carried millimeter wave generating device and method.The present invention adopts Mach-Zehnder modulators and delay interferometer; Based on optical nonlinearity modulation and interference technique; The bias voltage through Mach-Zehnder modulators rationally is set and the time delay of delay interferometer; Thereby produce 8 times of octonary light and carry millimeter wave, reduced the cost of system to frequency modulating signal.
The present invention adopts following concrete technical scheme to realize:
The octonary light that the present invention proposes carries millimeter wave generating device and comprises tunable light source, radio-frequency signal source, electric amplifier, Mach-Zehnder modulators, delay interferometer.The output of tunable light source links to each other with the light input end of Mach-Zehnder modulators; The output of radio-frequency signal source links to each other with the electric amplifier input; The output of electric amplifier links to each other with the radio-frequency driven end of Mach-Zehnder modulators; The Mach-Zehnder modulators output links to each other with the input port 1 of delay interferometer.
Said delay interferometer is two of τ by two three-dB couplers, time delay and interferes arms to be formed, and comprises two input ports and two output ports.
The octonary light that the present invention proposes carries millimeter wave generating method and may further comprise the steps:
Step 1, tunable light source generation frequency are that the continuous light wave input Mach-Zehnder modulators of fc is modulated, and radio-frequency signal source produces the sinusoidal local oscillation signal process electric amplifier amplification rear drive Mach-Zehnder modulators that frequency is fe;
The amplifying voltage of step 2, control electric amplifier; Make the centered carrier of Mach-Zehnder modulators output light signal be suppressed; The bias voltage of regulating Mach-Zehnder modulators is the peak of its transmission curve; Make the odd number sideband of Mach-Zehnder modulators output light signal be suppressed, then Mach-Zehnder modulators output comprises the light signal of six even number sidebands
Wherein, said optical signals second order upper sideband fc+2fe, second order lower sideband fc-2fe, quadravalence upper sideband fc+4fe, quadravalence lower sideband fc-4fe, six rank upper sideband fc+6fe and the six rank lower sideband fc-6fe that comprise six even number sidebands form;
Step 3, with the input port 1 of the light signal input delay interferometer of Mach-Zehnder modulators output; And the control lag interferometer two to interfere arm time delay τ be 0.25/fe, the octonary light that makes the output port 4 final output frequencies of delay interferometer be spaced apart 8fe carries millimeter wave;
Wherein, said frequency interval is that the octonary light of 8fe carries millimeter wave and is made up of quadravalence upper sideband fc+4fe and quadravalence lower sideband fc-4fe.
The invention has the beneficial effects as follows; The modulation signal of employing lower frequency just can produce 8 times of light to frequency modulating signal and carry millimeter-wave signal; As; The Mach-Zehnder modulators that only needs a 10GHz bandwidth and 10GHz sine local oscillation signal promptly can produce the light that frequency interval reaches 80GHz and carry millimeter-wave signal, greatly reduce the bandwidth requirement of light carrier radio communication system to device.In addition,, simplified the structure of device, had very strong operability, be easier to practical application owing to need not make electric devices such as electricity consumption phase-shifter, electric shunt.
Description of drawings
Fig. 1 produces schematic diagram for octonary light of the present invention carries millimeter wave;
Fig. 2 is embodiment of the invention figure as a result;
Wherein, Fig. 2 (a) is the time domain waveform of 10GHz sinusoidal drive signals; Fig. 2 (b) is the frequency spectrum of Mach-Zehnder modulators output light signal; Fig. 2 (c) is octonary light carries the electric millimeter-wave signal that millimeter-wave signal produces behind photodetector a time domain waveform; Fig. 2 (d) is the spectrum that the octonary light of delay interferometer output carries millimeter-wave signal; Fig. 2 (e) is that octonary light carries the electric millimeter-wave signal frequency spectrum that millimeter-wave signal produces behind photodetector.
Embodiment
Describe embodiment of the present invention in detail below in conjunction with accompanying drawing.
As shown in Figure 1, in the present embodiment, device comprises: tunable light source, radio-frequency signal source, electric amplifier, Mach-Zehnder modulators, delay interferometer.The output of tunable light source links to each other with the light input end of Mach-Zehnder modulators; The output of radio-frequency signal source links to each other with the electric amplifier input; The output of electric amplifier links to each other with the radio-frequency driven end of Mach-Zehnder modulators; The Mach-Zehnder modulators output links to each other with the input port 1 of delay interferometer.
In this instance, the practical implementation step of method is:
It is the continuous light wave of 1552.5nm that step 1, tunable optical source produce wavelength; Light wave is input to the Mach-Zehnder modulators that half-wave voltage is 4V continuously; The sinusoidal local oscillation signal of radio-frequency signal source output 10GHz is amplified the rear drive Mach-Zehnder modulators by electric amplifier;
The amplifying voltage of step 2, control electric amplifier; Make the sinusoidal local oscillation signal peak-to-peak value after electric amplifier amplifies be about 14V; And the bias voltage that Mach-Zehnder modulators is set is 0V, and then Mach-Zehnder modulators output comprises the light signal of second order upper sideband, second order lower sideband, quadravalence upper sideband, quadravalence lower sideband, six rank upper sidebands and six rank lower sidebands;
Step 3, with the input port 1 of the light signal input delay interferometer of Mach-Zehnder modulators output; And the control lag interferometer two to interfere arm time delay τ be 25ps, then delay interferometer output port 4 final output frequencies are spaced apart 80GHz, the octonary light that only comprises quadravalence upper sideband and quadravalence lower sideband carries millimeter wave;
The octonary light that step 4, said frequencies are spaced apart 80GHz carries millimeter wave through producing 80GHz electricity millimeter wave behind the photodetector.
Fig. 2 is that this exemplary application is in result shown in Figure 1.Wherein, Fig. 2 (a) is the time domain waveform of 10GHz sinusoidal drive signals, can see that its cycle is 100ps; Fig. 2 (b) is the frequency spectrum of Mach-Zehnder modulators output light signal, can see that it comprises six even number sidebands, is respectively second order upper sideband, second order lower sideband, quadravalence upper sideband, quadravalence lower sideband, six rank upper sidebands and six rank lower sidebands; Fig. 2 (c) is octonary light carries the electric millimeter-wave signal that millimeter-wave signal produces behind photodetector a time domain waveform, can see that its cycle is 12.5ps, and is consistent with the waveform of original 10GHz sinusoidal drive signals, and distortion does not take place; Fig. 2 (d) is the frequency spectrum that the octonary light of delay interferometer output carries millimeter-wave signal, can see that it comprises quadravalence upper sideband and two even number sidebands of quadravalence lower sideband, and frequency interval is 80GHz; Fig. 2 (e) is that octonary light carries the electric millimeter-wave signal frequency spectrum that millimeter-wave signal produces behind photodetector, can see the high about 28dB of other Frequency point power of power ratio of 80GH Frequency point.
In a word, the above embodiment is merely preferred embodiments of the present invention, is not only to be used to limit protection scope of the present invention.Should be understood that; Ordinary skill for the present technique field; On content disclosed by the invention; Can also make some equivalent variations and replacement, the frequency range of millimeter wave also is not limited to 80GHz, and the modulation of these equivalent variations and replacement and frequency range also should be regarded as protection scope of the present invention.
Claims (2)
1. an octonary light carries the generation device of millimeter wave, comprises tunable light source, radio-frequency signal source, electric amplifier, Mach-Zehnder modulators, delay interferometer, it is characterized in that:
The output of said tunable light source links to each other with the light input end of Mach-Zehnder modulators; The output of said radio-frequency signal source links to each other with the electric amplifier input; The output of said electric amplifier links to each other with the radio-frequency driven end of Mach-Zehnder modulators; Said Mach-Zehnder modulators output links to each other with the input port 1 of delay interferometer; Said delay interferometer is two of τ by two three-dB couplers, time delay and interferes arms to be formed, and comprises two input ports and two output ports.
2. an octonary light carries the production method of millimeter wave, it is characterized in that, comprises following steps:
Step 1, tunable light source generation frequency are that the continuous light wave input Mach-Zehnder modulators of fc is modulated, and radio-frequency signal source produces the sinusoidal local oscillation signal process electric amplifier amplification rear drive Mach-Zehnder modulators that frequency is fe;
The amplifying voltage of step 2, control electric amplifier; Make the centered carrier fc of Mach-Zehnder modulators output light signal be suppressed; The bias voltage of regulating Mach-Zehnder modulators is the peak of its transmission curve; Make the odd number sideband of Mach-Zehnder modulators output light signal be suppressed, then Mach-Zehnder modulators output comprises the light signal of six even number sidebands;
Wherein, said optical signals second order upper sideband fc+2fe, second order lower sideband fc-2fe, quadravalence upper sideband fc+4fe, quadravalence lower sideband fc-4fe, six rank upper sideband fc+6fe and the six rank lower sideband fc-6fe that comprise six even number sidebands form;
Step 3, the light signal of Mach-Zehnder modulators output is input to the input port 1 of delay interferometer; And the control lag interferometer two to interfere arm time delay τ be 0.25/fe, the octonary light that makes the output port 4 final output frequencies of delay interferometer be spaced apart 8fe carries millimeter wave;
Wherein, said frequency interval is that the octonary light of 8fe carries millimeter wave and is made up of quadravalence upper sideband fc+4fe and quadravalence lower sideband fc-4fe.
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Cited By (7)
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| CN103281130A (en) * | 2013-05-31 | 2013-09-04 | 上海交通大学 | Multiple frequency millimeter wave generating device based on single-drive Mach-Zehnder modulator |
| CN105007120A (en) * | 2015-07-08 | 2015-10-28 | 北京邮电大学 | Eightfold-frequency optical millimeter wave generation method and system based on polarization modulator cascading |
| CN105553510A (en) * | 2016-01-11 | 2016-05-04 | 北京航空航天大学 | Production method of Gaussian fourth-order differential ultra wide band pulse |
| CN106209250A (en) * | 2016-06-18 | 2016-12-07 | 西安电子科技大学 | Utilize IM manipulator and the device and method of the raw octonary millimeter wave of DPMZM modulator stage coproduction |
| CN107017945A (en) * | 2017-05-24 | 2017-08-04 | 华侨大学 | A kind of optical carrier suppression octonary optical millimeter wave generating device |
| CN111064522A (en) * | 2019-12-10 | 2020-04-24 | 北京邮电大学 | Method and system for generating 16 frequency multiplication millimeter waves based on cascade Mach-Zehnder modulators |
| CN111527443A (en) * | 2018-01-12 | 2020-08-11 | 斯科雅有限公司 | Optical signal modulator comprising a feedback loop |
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Cited By (13)
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| CN103281130B (en) * | 2013-05-31 | 2016-05-25 | 上海交通大学 | Based on single multiple frequence millimeter wave generating device that drives Mach zehnder modulators |
| CN103281130A (en) * | 2013-05-31 | 2013-09-04 | 上海交通大学 | Multiple frequency millimeter wave generating device based on single-drive Mach-Zehnder modulator |
| CN105007120B (en) * | 2015-07-08 | 2017-08-11 | 北京邮电大学 | The 8 times frequency optical millimeter waves production methods and system cascaded based on light polarization modulator |
| CN105007120A (en) * | 2015-07-08 | 2015-10-28 | 北京邮电大学 | Eightfold-frequency optical millimeter wave generation method and system based on polarization modulator cascading |
| CN105553510A (en) * | 2016-01-11 | 2016-05-04 | 北京航空航天大学 | Production method of Gaussian fourth-order differential ultra wide band pulse |
| CN105553510B (en) * | 2016-01-11 | 2019-06-18 | 北京航空航天大学 | A kind of production method of Gauss quadravalence derivative-type ultra-wideband pulse |
| CN106209250A (en) * | 2016-06-18 | 2016-12-07 | 西安电子科技大学 | Utilize IM manipulator and the device and method of the raw octonary millimeter wave of DPMZM modulator stage coproduction |
| CN106209250B (en) * | 2016-06-18 | 2018-10-16 | 西安电子科技大学 | Increase the method that the DPMZM cascades of Dare modulator generate octonary millimeter wave using intensity modulator IM and double parallel Mach |
| CN107017945A (en) * | 2017-05-24 | 2017-08-04 | 华侨大学 | A kind of optical carrier suppression octonary optical millimeter wave generating device |
| CN111527443A (en) * | 2018-01-12 | 2020-08-11 | 斯科雅有限公司 | Optical signal modulator comprising a feedback loop |
| CN111527443B (en) * | 2018-01-12 | 2023-11-21 | 斯科雅有限公司 | Optical signal modulator including feedback loop |
| CN111064522A (en) * | 2019-12-10 | 2020-04-24 | 北京邮电大学 | Method and system for generating 16 frequency multiplication millimeter waves based on cascade Mach-Zehnder modulators |
| CN111064522B (en) * | 2019-12-10 | 2021-01-12 | 北京邮电大学 | Method and system for generating 16 frequency multiplication millimeter waves based on cascade Mach-Zehnder modulators |
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Application publication date: 20121107 |