CN105099558A - Frequency octupling millimeter wave generation device by means of DP-QPSK modulator and method thereof - Google Patents
Frequency octupling millimeter wave generation device by means of DP-QPSK modulator and method thereof Download PDFInfo
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Abstract
The invention discloses a frequency octupling millimeter wave generation device by means of a double polarization-quadrature phase shift keying (DP-QPSK) modulator and a method thereof, relates to the technical fields of microwave and optical communication, and is mainly applied to generation of high-frequency millimeter wave. According to the method shown in the appended drawings, the device comprises a light source, a radio frequency signal source, the DP-QPSK modulator, a phase shifter, a power divider, a polarization controller, a polarizer and a photoelectric detector. The nonlinear characteristics and the interference superposition characteristics of the two sub-modulators X-QPSK and Y-QPSK of the DP-QPSK modulator are utilized, and polarization controller is properly adjusted when the two sub-modulators XI and XQ of X-QPSK and a main modulator work at the maximum point so that frequency octupling millimeter wave signals can be generated, the radio frequency index required by generation of high-frequency/extremely-high-frequency signals can be greatly reduced and thus system cost can be reduced. Use of a filter is avoided by the method, and frequency adjustment performance is great. Meanwhile, the generated signals are great in phase noise and frequency spectrum purity.
Description
Technical field
The present invention relates to technical field of photo communication and microwave technical field, particularly relate to a kind of method producing octonary millimeter-wave signal based on external modulation technology utilizing comparative maturity in optical communication technique.
Background technology
Along with the continuous progress of science and technology, especially information technology updates fast, and the generation technology with high-quality microwave signals such as spectral purity are high, radio frequency stability is high, phase noise is low becomes the key of microwave applications.High-quality microwave signal has a wide range of applications in a lot of field, as: radar system, wireless communication system and electronic warfare system.But for traditional electronic technology, the generation of millimeter-wave signal faces bandwidth bottleneck, and in coaxial cable or air, transmit millimeter-wave signal can produce very large loss, this is unfavorable for the transmission of the signal of telecommunication.Therefore in a broadband wireless communication system, light carries radio frequency (ROF) technology as the potential scheme of a kind of very tool by positive research.
No matter military or civil in application, band is roomy, dynamic range large and sensitivity high all to require microwave system to have.Especially also can be more and more higher to the requirement of microwave system at military radar and electronic countermeasures field.Simultaneously, along with the raising of message complexity, information are abundanter, therefore propose higher, stricter requirement to the performance of information system, especially more and more higher requirement is proposed to the frequency stability of the signal source in microwave system and the purity of frequency spectrum.Therefore, the microwave signal producing high-frequency, high spectral purity, band wide tunable and phase noise low seems most important.
A very crucial problem in the generation of ROF system medium-high frequency millimeter wave, tradition electrical domain method is difficult to the generation that even almost cannot complete very complicated extremely high frequency millimeter-wave signal, it is mainly because generally use crystal oscillator to pass through frequency multiplication phase-locked generation high frequency millimeter ripple signal in electrical domain, because the rate limit of electronic device and the limitation of technique are difficult to produce high-frequency, high-quality signal.In addition, using electrical domain method to produce high frequency millimeter ripple signal has very high requirement to device, and complicated processing technology thereof may reduce the performance of device greatly.
Existing millimeter wave produces scheme has light heterodyne method, investigation mission outside the city or town method for making, based on nonlinear effect four-wave mixing effect method and stimulated Brillouin scattering method.In all these research methods, the external modulation scheme based on lithium niobate MZ Mach-Zehnder is considered to the most reliable and effective method usually.Because the frequency response of the microwave devices such as the local vibration source used in external modulation frequency-doubling method and modulator reduces all greatly, and two light waves carrying out beat frequency in photodetector all have extraordinary phase coherence from same lasing light emitter.Therefore, external modulation technology becomes the one preferred technique producing millimeter-wave signal.
Summary of the invention
In order to solve technical problem existing in background technology, the present invention proposes one utilizes dual-polarization Quadrature Phase Shift Keying (DP-QPSK) modulator to produce the method for octonary millimeter wave, device frequency index required for generation high frequency/extremely high frequency signal is reduced greatly, and then reduce system cost, and by regulating radio frequency amplitude, higher radio frequency spur suppression ratio can be obtained.
Technical solution of the present invention is: utilize DP-QPSK modulator to produce the device of octonary millimeter wave, it is characterized in that: described device comprises light source, radio-frequency signal source, DP-QPSK modulator, phase shifter, electric shunt, Polarization Controller, the polarizer and photodetector; The output port of light source is connected with DP-QPSK modulator, the output of radio-frequency signal source is connected with electric shunt input, an output of electric shunt is connected with a rf inputs mouth of DP-QPSK modulator, another output is connected with the input of phase shifter, the output of phase shifter is connected with another rf input port of DP-QPSK modulator, the output of DP-QPSK modulator is connected with Polarization Controller, the output of Polarization Controller is connected with the polarizer, and the output of the polarizer is input to the input of photodetector.
Above-mentioned DP-QPSK modulator is made up of two qpsk modulators and a polarized light beam combining device.
Above-mentioned two qpsk modulators are respectively X-QPSK and Y-QPSK, two qpsk modulator parallel connections.
Above-mentioned two qpsk modulators include three Mach-Zehnder modulators, and one of them Mach-Zehnder modulators is as MAIN MUX, and two other Mach-Zehnder modulators is embedded in MAIN MUX as sub-modulator.
Above-mentioned sub-modulator has independently radio-frequency (RF) signal input end mouth and offset port; Also have a main offset port in addition, can be used to the phase difference output of adjustment two sub-modulators.
Utilize DP-QPSK modulator to produce the method for octonary millimeter wave, it is characterized in that: said method comprising the steps of:
1) wavelength sent from laser is that the linear polarized beams of λ incides DP-QPSK modulator through polarization maintaining optical fibre;
2) frequency be the radio-frequency (RF) local oscillator of f through the identical two-way of electric shunt point success rate, a road drives the XI modulator of X-QPSK modulator, and another road is through the XQ modulator of phase shifter phase shift pi/2 rear drive X-QPSK modulator;
3) XI and XQ two sub-modulators of X-QPSK modulator are all biased in the maximum point of its transmission curve, and MAIN MUX is biased in maximum point.Introduce the phase difference of pi/2 between modulator XI and XQ, therefore the phase difference of the positive and negative second order sideband on road is π up and down, positive and negative quadravalence sideband homophase, and after such two ways of optical signals superposition, the positive and negative second order sideband in upper and lower road is offset, and positive and negative quadravalence sideband strengthens;
4) the Y-QPSK modulator of DP-QPSK modulator does not load radio frequency and direct current signal, thus only exports optical carrier;
5) light signal that X-QPSK modulator and Y-QPSK modulator export exports after a PBC is coupled;
6) regulate Polarization Controller, make light signal after the polarizer, light carrier is inhibited;
7) polarizer exports pure positive and negative quadravalence sideband, and frequency interval is therebetween 8f, carries out by photodetector the octonary signal that beat frequency obtains radio-frequency (RF) driving signal.
The present invention proposes a kind of method of novel octonary photoproduction millimeter wave, the program utilizes the nonlinear characteristic of DP-QPSK modulator and interferes superimposed characteristics, create the optical millimeter wave signal that frequency is local oscillation signal frequency octuple, greatly reduce the frequency of radio-frequency (RF) local oscillator signal and the response frequency requirement of modulator.Such as, we only need frequency to be the radio-frequency (RF) local oscillator signal of 3GHz, just can produce the millimeter-wave signal of 24GHz.The present invention sends out standby simple, has very strong actual operability.This structure does not need stationary phase modulation index, can flexible radiofrequency signal amplitude, suppresses spuious sideband, obtains higher suppress sideband ratio.This structure does not need to use any filter simultaneously, therefore can be applied in wdm system.
Accompanying drawing explanation
Fig. 1 is that the present invention utilizes DP-QPSK modulator to produce frequency octuple in the schematic diagram of the millimeter wave of local oscillation signal;
Fig. 2 is the optical signal magnitude everywhere of Fig. 1 and the output spectrum schematic diagram of phase place;
Fig. 3 is the octonary spectrum produced by 3GHz local oscillator in experiment;
Fig. 4 is after in experiment, optical millimeter wave signal passes through high-speed photodetector, the 24GHz local oscillation signal spectrogram that beat frequency obtains;
Fig. 5 is the phase noise of 24GHz local oscillation signal and the comparison diagram of 3GHz local vibration source phase noise of experiment generation;
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention are not limited to following embodiment:
As shown in Figure 1, in the present embodiment, device comprises: light source 1, radio-frequency signal source 2, DP-QPSK modulator 3, phase shifter 4, electric shunt 5, Polarization Controller 6, the polarizer 7, photodetector 8.The output port of light source 1 is connected with DP-QPSK modulator 3, the output of radio-frequency signal source 2 is connected with electric shunt 5 input, an output of electric shunt 5 is modulated with XI of the X-QPSK modulator of DP-QPSK modulator 3 and is connected, another output of electric shunt 5 is modulated with XQ of the X-QPSK modulator of DP-QPSK modulator 3 and is connected after phase shifter 4, DP-QPSK modulator 3 exports and obtains light carrier and positive and negative quadravalence sideband, DP-QPSK modulator 3 is connected with Polarization Controller 6 after exporting, Polarization Controller 6 is connected with the polarizer 7 after exporting, after the polarizer 7, the light signal light carrier exported is suppressed, only leave positive and negative quadravalence sideband, then, the output of the polarizer 7 is connected with the input of photodetector 8.Finally, after photodetector 8 beat frequency, octonary millimeter-wave signal is obtained at output.
In this example, the concrete implementation step of method is:
Step one, light source produce the continuous light wave that operation wavelength λ is 1552.153nm, continuous light wave is input to the DP-QPSK modulator that half-wave voltage is 3.5V, radio-frequency signal source exports the local oscillation signal two-way that point success rate is equal after electric shunt of 3GHz, one tunnel is modulated for driving XI of the X-QPSK modulator of DP-QPSK modulator, separately lead up to phase shifter phase shift pi/2 rear drive DP-QPSK modulator X-QPSK modulator XQ modulation;
The bias voltage of step 2, the bias voltage arranging the XI modulator of the X-QPSK modulator of DP-QPSK modulator to be the bias voltage of the XQ modulator of the X-QPSK modulator of 0V, DP-QPSK modulator be 0V, X-QPSK modulator MAIN MUX is 0V.The XI modulator of X-QPSK modulator exports and mainly comprises light sanction ripple, positive and negative second order sideband and positive and negative quadravalence sideband, the XQ modulator of X-QPSK modulator exports and mainly comprises light carrier, positive and negative second order sideband and positive and negative quadravalence sideband, and Y-QPSK modulator exports light carrier;
Step 3, phase difference owing to driving the radiofrequency signal of XI and XQ two sub-modulators to have pi/2, therefore the positive and negative second order that exports of MI modulator and the positive and negative second order that exports of XQ modulator have the phase difference of π, and positive and negative quadravalence sideband homophase, therefore cancel out each other at the positive and negative second order sideband of the output of X-QPSK modulator, positive and negative quadravalence sideband strengthens.Y-QPSK modulator exports light carrier.Therefore at the output of DP-QPSK modulator, light carrier and positive and negative quadravalence sideband is only had;
Step 4, adjustment Polarization Controller, make the light carrier in the spectrum exported by DP-QPSK modulator be inhibited, and like this after the polarizer, only leaves 4 purer rank sidebands and+4 rank sidebands in spectrum.
The light signal incident light electric explorer that step 5, the polarizer export carries out opto-electronic conversion, thus creates the millimeter-wave signal that frequency is 24GHz.The program obtains the electricity spectrum that frequency is 24GHz as seen from Figure 4, and radio frequency spur suppression ratio reaches 12.68dB.The octonary microwave signal that the program generates as seen from Figure 5 has good phase noise characteristic, worsens 18dB with the phase noise of the first local oscillator of radio frequency.
To sum up, the present invention achieves the generation of millimeter wave octonary signal due to the coherent superposition characteristic and nonlinear characteristic that make use of DP-QPSK modulator.Reduce the frequency requirement to electrooptic modulator and radio-frequency (RF) local oscillator in millimeter-wave systems, and the millimeter-wave signal frequency high purity produced.This invention makes high frequency, the generation of extremely high frequency millimeter-wave signal has had actual operability.
In a word; the above embodiment is only preferred embodiment of the present invention; not only for limiting protection scope of the present invention; should be understood that; for those skilled in the art; in content disclosed by the invention; some equivalent variations and replacement can also be made; the frequency range of millimeter wave is not limited to 24GHz; if use the radio-frequency (RF) local oscillator of 5GHz; this system can produce the millimeter-wave signal of 40GHz, and the adjustment of these equivalent variations and replacement and frequency range also should be considered as the scope of protection of the invention.
Claims (6)
1. utilize DP-QPSK modulator to produce the device of octonary millimeter wave, comprise light source, radio-frequency signal source, DP-QPSK modulator, phase shifter, electric shunt, Polarization Controller, the polarizer and photodetector; Described DP-QPSK modulator is arranged on the emitting light path of light source, it is characterized in that: the output of described DP-QPSK modulator is connected with Polarization Controller, and the output of described Polarization Controller is connected with the polarizer, and the described polarizer is connected with photodetector;
The underarm prevention at radio-frequency port of the X-QPSK of described DP-QPSK modulator is connected with electric phase shifter microwave signal being produced to phase shift, 90 ° of phase shifts introduced by electricity phase shifter, the input of described electric phase shifter is connected with an output of electric shunt, another output of described electric shunt is connected with the upper arm prevention at radio-frequency port of X-QPSK, the input input microwave signal of described electric shunt, two son modulation of X-QPSK are all operated in maximum point, the MAIN MUX of X-QPSK is operated in maximum point, and the sub-modulator of X-QPSK exports as carrier wave and positive and negative quadravalence sideband;
The upper underarm modulation of the Y-QPSK of described DP-QPSK modulator does not all add radiofrequency signal, and the modulation of Y-QPSK exports and only comprises light carrier, and DP-QPSK exports after Polarization Controller and the polarizer, and photodetector exports as octonary signal.
2. optics according to claim 1 produces the device of microwave octonary signal, it is characterized in that: described electric phase shifter can be connected between the upper arm prevention at radio-frequency port of the X-QPSK modulator of DP-QPSK modulator and an output port of electric shunt or between underarm prevention at radio-frequency port and an output port of electric shunt.
3. the optics according to claims 1 produces the device of microwave octonary signal, it is characterized in that: arrange between described DP-QPSK modulator and photodetector and only have Polarization Controller and the polarizer.
4. the DP-QPSK that utilizes according to claims 1 modulates the device producing octonary millimeter wave, it is characterized in that: described DP-QPSK modulator comprises the two parallel Mach-Zehnder modulators (DPMZM) of X-QPSK with Y-QPSK two, DPMZM modulator includes three Mach-Zehnder modulators, one of them Mach-Zehnder modulators is as MAIN MUX, and two other Mach-Zehnder modulators is embedded in MAIN MUX as sub-modulator.
5. the device utilizing DP-QPSK modulator to produce octonary millimeter wave according to claim 4, is characterized in that: described X-QPSK and Y-QPSK modulator has identical stuctures and properties.
6. the device utilizing DP-QPSK modulator to produce octonary millimeter wave according to claim 5, is characterized in that: described X-QPSK and Y-QPSK modulator has independently radio-frequency (RF) signal input end mouth and offset port also having a main offset port in addition.
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