CN103795472B - Based on the production method of the three-dimensional modulating UWB signal of single Dual Drive modulator - Google Patents
Based on the production method of the three-dimensional modulating UWB signal of single Dual Drive modulator Download PDFInfo
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- CN103795472B CN103795472B CN201410075540.6A CN201410075540A CN103795472B CN 103795472 B CN103795472 B CN 103795472B CN 201410075540 A CN201410075540 A CN 201410075540A CN 103795472 B CN103795472 B CN 103795472B
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Abstract
A kind of production method of the three-dimensional modulating UWB signal based on single Dual Drive modulator of communication technical field, first produce four circuit-switched data pulse signals by pulse signal source, every circuit-switched data pulse signal makes the voltage amplitude of the first data pulse signal and the 3rd data pulse signal higher than the voltage amplitude of the second data pulse signal and the 4th data pulse signal through precoding processing; Then respectively the first data pulse signal and the second data pulse signal are carried out superposing, the 3rd data pulse signal and the 4th data pulse signal being carried out superposing and forms two groups of superposed signals; Then by superposed signal respectively through after amplifying and be loaded on the two ends of Dual Drive Mach-Zehnder modulators after phase bias process, make Dual Drive Mach-Zehnder modulators export the UWB signal of three dimensions after coherent superposition.The present invention the bandwidth sum of effective elevator system can produce the dimension of UWB signal.
Description
Technical field
What the present invention relates to is a kind of method of communication technical field, specifically one utilizes single Dual Drive Mach-Zehnder modulators (Dual-driveMach – ZehnderModulator, DDMZM) method of three-dimensional modulating UWB signal (Ultrawideband, UWB) is at a high speed produced.
Background technology
Wireless communication system has been with a lot of facility to modern society, phone, TV, Wireless Fidelity (Wireless-fidelity, Wi-Fi), the technology such as global-positioning technology (GlobalPositionSystem, GPS) are all huge on the life impact of people, can say that the mankind cannot leave radio communication today.Meanwhile ultra-broadband signal (Ultrawideband, UWB) is widely studied as a kind of wireless communication technique, has many advantages mainly due to it: with coexisting of other wireless communication system, high bandwidth, low power spectral density etc.Along with the increase of various wireless traffic bandwidth, the bandwidth demand of system increases gradually, therefore the research direction that UWB signal at a high speed becomes people is produced, produced by the technology of photonic propulsion and transmit the bandwidth sum transmission range that UWB signal effectively can improve system, reduce the complexity of generation simultaneously, therefore need to produce UWB data at a high speed by the technology of photonic propulsion.
The photon of UWB signal produces technology, mainly by the technology of various opto-electronic conversion, low speed gaussian signal in electrical domain is modulated to area of light, produces a reverse energy signal by various full light technology simultaneously, corresponding UWB waveform and signal after time domain staggers, can be obtained.Produce UWB signal and can adopt multiple technologies, the class Gaussian pulse of a 10GHz low repeatability can effectively be reduced radio frequency (Radiofrequency by dispersive transmission, RF) energy of signal low frequency, thus make the signal of output meet the spectrum requirement of UWB signal.But existing UWB signal great majority are UWB signal of low speed, most signal is all in same dimension simultaneously, comprises the phase-modulation of UWB pulse, amplitude modulation(PAM), pulses shape modulation, and pulse strength is modulated, the technology such as pulse position modulation.Therefore how to produce at a high speed by easy method, the UWB signal of multiple dimension is called a kind of challenge.
Through finding the retrieval of prior art, the paper of PhotonicsTechnologyLetter the 18th volume 19 phase in 2006: FeiZengandJianpingYao, " Ultrawidebandimpulseradiosignalgenerationusingahigh-spee delectroopticphasemodulatorandafiber-Bragg-grating-based frequencydiscriminator, " Yao of Canadian University of Ottawa builds equality people and propose, by the class Gaussian pulse string of low repeatability, phase signal is should be mutually by electrooptic modulation technology, then phase modulated signal wavelength is placed on filtering rising edge and the trailing edge of Fiber Bragg Grating FBG (FBG), according to the principle of frequency discrimination technology, the UWB signal of two kinds or more of different wave can be produced, but a kind of waveform can only be produced in the same moment, the switching produced between different wave signal needs the centre wavelength regulating light carrier.
Further retrieval finds, the paper of OpticsLetters the 31st volume 21 phase in 2009: QingWang, FeiZeng, SebastienBlais, andJianpingYao " OpticalUWBmonocyclepulsegenerationbasedoncross-gainmodul ationinasemiconductoropticalamplifier ", Yao of University of Ottawa of Canada builds equality people and proposes again, by the class Gaussian pulse string of low repeatability, phase signal is should be mutually by electro-optic intensity modulator modulation technique, reverse strength signal is created by the light of signal and another one wavelength is inputted semiconductor optical amplifier simultaneously, combination of staggering through the time domain of time delay obtains corresponding UWB signal, but the data of on-off keying (OOK) in addition can only be produced.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of method of three-dimensional modulating UWB signal is provided, the bandwidth sum of effective elevator system can produce the dimension of UWB signal.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
1) by pulse signal source (Patternpulsegenerator, PPG) produce four circuit-switched data pulse signals, every circuit-switched data pulse signal makes the voltage amplitude of the first data pulse signal and the 3rd data pulse signal higher than the voltage amplitude of the second data pulse signal and the 4th data pulse signal through precoding processing; Then respectively the first data pulse signal and the second data pulse signal are carried out superposing, the 3rd data pulse signal and the 4th data pulse signal being carried out superposing and forms two groups of superposed signals;
2) by superposed signal respectively through after amplifying and be loaded on the two ends of Dual Drive Mach-Zehnder modulators after phase bias process, make Dual Drive Mach-Zehnder modulators export the UWB signal of three dimensions after coherent superposition.
Described phase bias process refers to: be pi/2 by phase difference between the biased signal making that the two ends of Dual Drive Mach-Zehnder modulators load that regulates two groups of superposed signals.
The UWB signal of three described dimensions is:
Described precoding processing specifically refers to: four bits that the signal that will modulate is often adjacent are divided into one group, and then lookup table obtains 8 bit information of corresponding signal, thus obtains corresponding precoded signal.
The present invention relates to a kind of device realizing said method, comprising: laser, Dual Drive Mach-Zehnder modulators, pulse signal emission source, adder, amplifier, offset controller, Polarization Controller and receiver.Wherein: laser generation light carrier transfers to Dual Drive Mach-Zehnder modulators through Polarization Controller, pulse signal emission source produces four tunnels and makes the voltage amplitude of the first data pulse signal and the 3rd data pulse signal higher than the voltage amplitude of the second data pulse signal and the 4th data pulse signal through precoding processing data, first data pulse signal and the second data pulse signal, 3rd data pulse signal and the 4th data pulse signal obtain two groups of superposed signals respectively through adder, two groups of superposed signals transfer to Dual Drive Mach-Zehnder modulators respectively through amplifier and offset controller, Dual Drive Mach-Zehnder modulators exports the UWB signal of three dimensions to receiver.
Compared with prior art, the present invention just can produce the UWB signal containing three dimensions by simple Single wavelength light and Dual Drive Mach-Zehnder modulators, thus can when symbol rate is constant the data transfer rate that transmits of elevator system greatly.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention;
Fig. 2 is waveform schematic diagram of the present invention;
In figure: the waveform that (i)-(iv) is the different signal of 4 of being carried in Dual Drive Mach-Zehnder modulators two prevention at radio-frequency port and overlaid waveforms, (v) exports schematic diagram for the superposition that is modulated to phase information on light signal and output is relevant;
Fig. 3 is three dimensional signal UWB signal waveforms, the bit sequence of each self information of three dimensions and four road signals of corresponding bit information and its correspondence;
Fig. 4 is the two path signal generated after superposition in embodiment 1;
Fig. 5 is before transmitting under different time domain yardstick and the oscillogram of the rear signal of transmission;
Fig. 6 is the three-dimensional UWB signal electricity frequency spectrum producing signal in embodiment 1;
Fig. 7 be produce in embodiment 1 position corresponding to three-dimensional UWB signal waveform, phase place and amplitude information.
Embodiment
Elaborate to embodiments of the invention below, 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 is not limited to following embodiment.
Embodiment 1
The method of the present embodiment is specifically: first produce four circuit-switched data pulse signals by pulse signal source, namely the data 1 shown in Fig. 1, data 2, data 3 and data 4, each signal makes the first data pulse signal and the 3rd data pulse signal voltage amplitude higher than the voltage amplitude of the second data pulse signal and the 4th data pulse signal through precoding processing, first data pulse signal and the second data pulse signal superpose, 3rd data pulse signal and the 4th data pulse signal superpose, form two groups of superposed signals and respectively through after amplifying and be loaded on the two ends of Dual Drive Mach-Zehnder modulators after phase bias process, make the UWB signal of three dimensions after Dual Drive Mach-Zehnder modulators output coherent superposition.
Described phase bias process refers to: be pi/2 by phase difference between the biased signal making that the two ends of Dual Drive Mach-Zehnder modulators load that regulates two groups of superposed signals.
The UWB signal of three described dimensions comprises: the pulse position modulation signal of precoded signal determining positions, determine displacement modulation signal by the phase information entrained by Direct/Reverse pulse relative position simultaneously, then by pulse amplitude modulated signal that UWB signal pulse amplitude determines.
Described precoding processing specifically refers to: four often adjacent for the signal of transmission bits are divided into one group, then according to 8 bit information to corresponding signal of lookup table, thus obtains corresponding precoded signal.
As shown in Figure 1, the device that the present embodiment uses comprises: laser 1, Dual Drive Mach-Zehnder modulators 2, pulse signal emission source (not shown), adder 3, amplifier 4, offset controller 5, Polarization Controller 6, receiver 7.Wherein pulse signal emission source can produce the Gaussian pulse that four circuit-switched data are 10GHz, each signal carries out corresponding precoding processing simultaneously, in four signals, the first data pulse signal and the 3rd data pulse signal have high voltage amplitude, and the second data pulse signal and the 4th data pulse signal have low voltage amplitude simultaneously.First data pulse signal and the second data pulse signal have different voltage amplitudes, then superpose, then pass through the amplification of radio frequency driver amplifier 4, more then modulate radio frequency first port of Dual Drive Mach-Zehnder modulators 2 via offset controller 5.Meanwhile the 3rd data pulse signal and the 4th data pulse signal adopt same technology by the Data import after combination to radio frequency second port, by reasonably regulating the amplitude of the two paths of data after superposition, the two ends of Dual Drive Mach-Zehnder modulators 2 can produce the phase modulated signal of a pi/2 respectively, meanwhile the phase shift between upper and lower two paths of signals is made to reach pi/2 by adjustment two offset controllers 5, therefore two signals interfere conjunction road can produce corresponding strength signal in Dual Drive Mach-Zehnder modulators 2, thus obtain the UWB signal of three dimensions.Signal can be received machine 7 and detect after Optical Fiber Transmission, obtains the corresponding signal of telecommunication.Thus create three-dimensional UWB signal by the technology of full light.
Described laser 1 is a kind of laser 1 that can produce the light carrier of narrow linewidth, may be used for the signal madulation of electricity to area of light.
Described Dual Drive Mach-Zehnder modulators 2 is modulators of a kind of Dual Drive, and the upper and lower two-arm of modulator is made up of a phase-modulator respectively.Phase-modulation can be carried out respectively respectively in two ends under the driving of different external electric signals, and then in output, two-way phase modulated signal carries out interfering thus obtains the signal of telecommunication of three dimensions exported.
Described Transmission Fibers is the standard single-mode fiber that a segment length is about 25km, and its loss attenuation coefficient is 0.2dB/km.
Described modulation driving amplifier 4 is modulation driving amplifiers 4, the amplitude of the signal of telecommunication can be carried out corresponding amplitude of amplifying the demand that obtains.
Described offset controller 5 is a kind of offset signals that radiofrequency signal after amplification can load a direct current, with and the certificate that controls output signal to the relative phase shift between phase shift and two paths of signals.
Described optical receiver 7 is transformed into electrical domain for the UWB signal produced by light above, realizes opto-electronic conversion.
As shown in Figure 1, produce the general principle of three dimension UWB signal, the light that laser 1 exports can under the driving of four different road Signal averaging two paths of signals through the photoelectricity modulation of Dual Drive Mach-Zehnder modulators 2, in conjunction with adjustment two bias voltages with carry out rational precoding for each signal, can obtain at the relevant output port of Dual Drive Mach-Zehnder modulators 2 the Ultra-Wideband modulation signal containing three dimensions accordingly, the corresponding signal of telecommunication can be obtained through receiver 7.
As shown in Figure 2, four road precoded signal waveforms, amplify after first data pulse signal shown in i and the superposition of the second data pulse signal in Fig. 2, scheme the 3rd data pulse signal and the 4th data pulse signal shown in ii simultaneously and also carry out same process, shown in figure iii, figure iv, can obtain at two ports of Dual Drive Mach-Zehnder modulators 2 phase modulated signal that maximum phase shift is pi/2 through amplifying two paths of signals respectively.Control the phase shift between two-way, the passable relative phase shift at two ends that makes reaches pi/2, therefore interferes to export to obtain the corresponding UWB signal containing three dimensional information shown in figure v.The amplitude peak of the corresponding high level signal of A in the drawings, B represents the amplitude peak of the low level signal of telecommunication.Final single UWB signal can be expressed as:
Wherein Ei is the electrical power of input, Data
amplitudefor the amplitude information of signal transmission, A or B can be got, corresponding bit 1 and bit 0; Data
phasethe phase information of signal transmission, can get 1 or-1 corresponding bit 1 and bit 0; Data
amplitudefor the positional information of signal transmission, can ' 01100000 ' be got, ' 00110000 ', ' 00011000 ', and ' 00001100 ', corresponding bit 00,01,10, and 11, or-1 corresponding bit 1 and bit 0;
As shown in Figure 3, the information of often kind of different UWB waveform three dimensions of correspondence in the symbol period in 8 time intervals, 4 positions that wherein UWB signal can provide respectively in the drawings occur, corresponding respectively: ' 01100000 ', ' 00110000 ', ' 00011000 ', and ' 00001100 '.The data of high and low corresponding 1 bit respectively of amplitude of UWB pulse simultaneously, moreover the phase place of UWB pulse can transmit the phase signal of a bit.
As shown in the table, the pulse position that in transmitting bit sequences different in 16, every circuit-switched data is corresponding, data in figure give the ' 1 ' position in the cycle of 8 bits, can obtain the data of corresponding four tunnel pulses according to different transmitted bits through figure thus.Such as bit sequence ' 0000 ', the first data pulse signal, the second data pulse signal, the 3rd data pulse signal and the 4th data pulse signal are ' 00000000 ' respectively, ' 01000000 ', ' 00000000 ' and ' 00100000 '.
As shown in Figure 4, the different signal of four containing the first data pulse signal-four data pulse signal of 10GHz repetition rate is modulated to Dual Drive Mach-Zehnder modulators 2 after superposition between two two ends respectively by offset controller 5 are produced, what the individual bit ' 1 ' of 10GHz was approximate can think class Gaussian pulse signal by pulse signal emission source.Light signal after modulation is through the transmission of monomode fiber, and then light signal is converted to the three-dimensional ultra-broadband signal of electricity by signal by receiver 7.
As shown in Figure 5, first data pulse signal and the superposition of the second data pulse signal, the signal waveform obtained after 3rd data pulse signal and the 4th data pulse signal superpose, precoding processing in Fig. 2, can produce the UWB signal of corresponding three dimensions modulation when the two ends driving Dual Drive Mach-Zehnder modulators 2.
As shown in Figure 6, left side a is signal b-t-b, and the right b is the oscillogram of transmission 25km, and wherein time scale is respectively 1000ps/div, 500ps/div and 200ps/div.
As shown in Figure 7, through the electricity spectrum of the three-dimensional UWB signal that electric spectrometer equipment obtains, the UWB signal centre wavelength of generation is 3.5GHz, 10dB bandwidth is 5.7GHz, and from 1.2GHz to 6.9GHz, therefore the relative 10dB bandwidth of signal is approximately 163%.
As shown in Figure 7, produce the signal bit of three dimensions corresponding to three-dimensional UWB waveform, pulse position signal corresponding to UWB pulse is ' 10 ', ' 10 ', ' 11 ', ' 00 ', ' 01 ' and ' 00 '.The bit meanwhile transmitted by signal amplitude and phase modulated signal is ' 11 ', ' 01 ', ' 00 ', ' 11 ', ' 01 ' and ' 10 '.Therefore the signal bit that the UWB signal pulse of each three-dimensional is corresponding is ' 1011 ' respectively, ' 1001 ', ' 1100 ', ' 0011 ', ' 0101 ' and ' 0010 '.
Claims (3)
1., based on a production method for the three-dimensional modulating UWB signal of single Dual Drive modulator, it is characterized in that, comprise the following steps:
1) produce four circuit-switched data pulse signals by pulse signal source, every circuit-switched data pulse signal makes the voltage amplitude of the first data pulse signal and the 3rd data pulse signal higher than the voltage amplitude of the second data pulse signal and the 4th data pulse signal through precoding processing; Then respectively the first data pulse signal and the second data pulse signal are carried out superposing, the 3rd data pulse signal and the 4th data pulse signal being carried out superposing and forms two groups of superposed signals;
2) by superposed signal respectively through after amplifying and be loaded on the two ends of Dual Drive Mach-Zehnder modulators after phase bias process, make Dual Drive Mach-Zehnder modulators export the UWB signal of three dimensions after coherent superposition.
2. method according to claim 1, is characterized in that, described phase bias process refers to: be pi/2 by phase difference between the biased signal making that the two ends of Dual Drive Mach-Zehnder modulators load that regulates two groups of superposed signals.
3. the implement device based on method described in above-mentioned any one claim, it is characterized in that, comprise: laser, Dual Drive Mach-Zehnder modulators, pulse signal emission source, adder, amplifier, offset controller, Polarization Controller and receiver, wherein: laser generation light carrier transfers to Dual Drive Mach-Zehnder modulators through Polarization Controller, pulse signal emission source produces four tunnels and makes the voltage amplitude of the first data pulse signal and the 3rd data pulse signal higher than the voltage amplitude of the second data pulse signal and the 4th data pulse signal through precoding processing data, first data pulse signal and the second data pulse signal, 3rd data pulse signal and the 4th data pulse signal obtain two groups of superposed signals respectively through adder, two groups of superposed signals transfer to Dual Drive Mach-Zehnder modulators respectively through amplifier and offset controller, Dual Drive Mach-Zehnder modulators exports the UWB signal of three dimensions to receiver.
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| CN106842631B (en) * | 2015-12-07 | 2020-09-11 | 桂林 | Integrated multifunctional optical modulator |
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