CN103795472A - Three-dimensional modulation ultra-wide band signal generation method based on single double-drive modulator - Google Patents
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Abstract
一种通信技术领域的基于单个双驱动调制器的三维调制超宽带信号的产生方法，首先由脉冲信号源产生四路数据脉冲信号，每路数据脉冲信号经过预编码处理使得第一数据脉冲信号和第三数据脉冲信号的电压幅度高于第二数据脉冲信号和第四数据脉冲信号的电压幅度；然后分别将第一数据脉冲信号和第二数据脉冲信号进行叠加、将第三数据脉冲信号和第四数据脉冲信号进行叠加并形成两组叠加信号；然后将叠加信号分别经过放大后及相位偏置处理后加载至双驱动马赫-曾德尔调制器的两端，使得双驱动马赫-曾德尔调制器输出相干叠加后的三个维度的UWB信号。本发明能够有效的提升系统的带宽和产生UWB信号的维度。
A method for generating a three-dimensionally modulated ultra-wideband signal based on a single dual-drive modulator in the field of communication technology. First, a pulse signal source generates four data pulse signals, and each data pulse signal undergoes precoding processing so that the first data pulse signal and The voltage amplitude of the third data pulse signal is higher than the voltage amplitude of the second data pulse signal and the fourth data pulse signal; then respectively superpose the first data pulse signal and the second data pulse signal, and combine the third data pulse signal and the second data pulse signal The four data pulse signals are superimposed to form two sets of superimposed signals; then the superimposed signals are respectively amplified and phase biased and loaded to both ends of the dual-drive Mach-Zehnder modulator, so that the dual-drive Mach-Zehnder modulator Output the three-dimensional UWB signal after coherent superposition. The invention can effectively improve the bandwidth of the system and the dimension of generating UWB signals.
Description
Technical field
What the present invention relates to is a kind of method of communication technical field, specifically one is utilized single Dual Drive Mach-Zehnder modulators (Dual-drive Mach – Zehnder Modulator, DDMZM) method of generation three-dimensional modulating UWB signal (Ultra wideband, UWB) at a high speed.
Background technology
Wireless communication system has been with a lot of facilities to modern society, phone, TV, Wireless Fidelity (Wireless-fidelity, Wi-Fi), the technology such as global-positioning technology (Global Position System, GPS) are all huge on people's life impact, can say that the mankind cannot leave radio communication today.Meanwhile ultra-broadband signal (Ultra wideband, 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 produce UWB signal at a high speed and become a people's research direction, produce and transmit UWB signal and can effectively improve bandwidth and the transmission range of system by the technology of photonic propulsion, reduce the complexity producing simultaneously, therefore need to produce UWB data at a high speed by the technology of photonic propulsion.
The photon of UWB signal produces technology, it is mainly the technology by various opto-electronic conversion, low speed gaussian signal on electric territory is modulated to light territory, produces a reverse energy signal by various full light technology simultaneously, after staggering, can obtain corresponding UWB waveform and signal in time domain.Produce UWB signal and can adopt multiple technologies, the class Gaussian pulse of a 10GHz low repeatability is transmitted and can effectively be reduced radio frequency (Radio frequency by dispersion, RF) energy of signal low frequency, thus make the signal of output meet the spectrum requirement of UWB signal.But the UWB signal that existing UWB signal great majority are low speed, most signal is all in same dimension simultaneously, comprises the phase-modulation of UWB pulse, amplitude modulation(PAM), pulses shape modulation, pulse strength modulation, the technology such as pulse position modulation.Therefore how to produce at a high speed by easy method, the UWB signal of multiple dimensions is called a kind of challenge.
Through the retrieval of prior art is found, the paper of the 18th 19 phases of volume of Photonics Technology Letter in 2006: Fei Zeng and Jianping Yao, " Ultra wideband impulse radio signal generation using a high-speed electrooptic phase modulator and a fiber-Bragg-grating-based frequency discriminator, " Yao of Canadian University of Ottawa builds equality people and propose, by the class Gaussian pulse string of low repeatability, obtain should be mutually phase signal by electrooptic modulation technology, then phase modulated signal wavelength is placed on to filtering rising edge and the trailing edge of Fiber Bragg Grating FBG (FBG), according to the principle of frequency discrimination technology, can produce the UWB signal of two kinds or more of different wave, but can only produce a kind of waveform in the same moment, produce the centre wavelength that switching between different wave signal need to regulate light carrier.
Further retrieval is found, the paper of the 31st 21 phases of volume of Optics Letters in 2009: Qing Wang, Fei Zeng, Sebastien Blais, and Jianping Yao " Optical UWB monocycle pulse generation based on cross-gainmodulation in a semiconductor optical amplifier ", Yao of University of Ottawa of Canada builds equality people and proposes again, by the class Gaussian pulse string of low repeatability, obtain should be mutually phase signal by electric light intensity modulator modulation technique, by being inputted to semiconductor optical amplifier simultaneously, the light of signal and another one wavelength produces reverse strength signal, the combination of staggering of the time domain of process time delay has obtained corresponding UWB signal, but can only produce the data of on-off keying (OOK) in addition.
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, effectively the dimension of the bandwidth of elevator system and generation UWB signal.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
1) by pulse signal source (Pattern pulse generator, 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 superposeed, the 3rd data pulse signal and the 4th data pulse signal are superposeed and form two groups of superposed signals;
2) by superposed signal respectively after amplifying and phase bias be loaded on the two ends of Dual Drive Mach-Zehnder modulators after processing, make the UWB signal of three dimensions after Dual Drive Mach-Zehnder modulators output coherent superposition.
Described phase bias processing refers to: be pi/2 by regulating phase difference between the signal that the biasing of two groups of superposed signals makes to load on the two ends of Dual Drive Mach-Zehnder modulators.
The UWB signal of three described dimensions is:
Described precoding processing specifically refers to: every four the adjacent bits of signal that will modulate are divided into one group, and then lookup table obtains 8 bit information of corresponding signal, thereby obtains corresponding precoded signal.
The present invention relates to a kind of device of 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, the first data pulse signal and the second data pulse signal, the 3rd data pulse signal and the 4th data pulse signal obtain two groups of superposed signals through adder respectively, two groups of superposed signals transfer to Dual Drive Mach-Zehnder modulators through amplifier and offset controller respectively, the UWB signal of three dimensions of Dual Drive Mach-Zehnder modulators output is to receiver.
Compared with prior art, the present invention just can produce the UWB signal that contains three dimensions by simple single wavelength light and Dual Drive Mach-Zehnder modulators, thus data transfer rate that can elevator system is transmitted greatly in the situation that symbol rate is constant.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present invention;
Fig. 2 is waveform schematic diagram of the present invention;
In figure: (i)-(iv) for being carried in waveform and the overlaid waveforms of 4 different signals of two prevention at radio-frequency port of Dual Drive Mach-Zehnder modulators, (v) for being modulated to phase information on light signal and the relevant output of the stack schematic diagram of output;
Fig. 3 is three dimension signal UWB signal waveforms, the bit sequence of each self information of three dimensions and corresponding bit information and its corresponding Si road signal;
Fig. 4 is the two path signal generating after stack 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 that produces signal in embodiment 1;
Fig. 7 is corresponding position, phase place and the amplitude information of three-dimensional UWB signal waveform producing in embodiment 1.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The method of the present embodiment is specifically: first produce four circuit-switched data pulse signals by pulse signal source, be 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 voltage amplitude higher than the second data pulse signal and the 4th data pulse signal through precoding processing, the first data pulse signal and the second data pulse signal superpose, the 3rd data pulse signal and the 4th data pulse signal superpose, form two groups of superposed signals and respectively after amplifying and phase bias be loaded on the two ends of Dual Drive Mach-Zehnder modulators after processing, make the UWB signal of three dimensions after Dual Drive Mach-Zehnder modulators output coherent superposition.
Described phase bias processing refers to: be pi/2 by regulating phase difference between the signal that the biasing of two groups of superposed signals makes to load on the two ends of Dual Drive Mach-Zehnder modulators.
The UWB signal of three described dimensions comprises: the pulse position modulation signal of precoded signal determining positions, determined impulse phase modulation signal by the entrained phase information of Direct/Reverse pulse relative position simultaneously, then the pulse amplitude modulated signal determining by UWB signal pulse amplitude.
Described precoding processing specifically refers to: every the signal of transmission four adjacent bits are divided into one group, then according to 8 bit information to corresponding signal of lookup table, thereby obtain 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 four circuit-switched data and be the Gaussian pulse of 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.The first data pulse signal and the second data pulse signal have different voltage amplitudes, then superpose, then by the amplification of radio frequency driver amplifier 4, then follow radio frequency the first port of modulating 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 that the data after combination are loaded into radio frequency the second port, by the amplitude of the two paths of data after rational adjusting stack, two ends that can Dual Drive Mach-Zehnder modulators 2 produce respectively the phase modulated signal of a pi/2, meanwhile by regulating two offset controllers 5 to make the phase shift between upper and lower two paths of signals reach pi/2, therefore two signals are interfered and are closed road and can produce corresponding strength signal in Dual Drive Mach-Zehnder modulators 2, thereby 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.Thereby produce three-dimensional UWB signal by the technology of full light.
Described laser 1 is a kind of laser 1 of the light carrier that can produce narrow linewidth, can be for electric signal is modulated to light territory.
Described Dual Drive Mach-Zehnder modulators 2 is modulators of a kind of Dual Drive, and upper and lower two arms of modulator are 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, thereby two-way phase modulated signal is interfered the signal of telecommunication of three dimensions that obtain output.
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 to corresponding amplitude of amplifying the demand that obtains.
Described offset controller 5 is a kind of offset signals that load a direct current on can the radiofrequency signal after amplification, use and control output signal according to the relative phase shift between phase shift and two paths of signals.
Described optical receiver 7 is transformed into electric territory for the UWB signal that light is produced above, realizes opto-electronic conversion.
As shown in Figure 1, produce the basic principle of three dimension UWB signals, the light that laser 1 is exported can be under the driving of different Si road signal stack two paths of signals through the photoelectricity modulation of Dual Drive Mach-Zehnder modulators 2, in conjunction with regulating two bias voltages and carrying out rational precoding for each signal, the ultra broadband modulation signal of three dimensions can be obtained containing accordingly at the relevant output port of Dual Drive Mach-Zehnder modulators 2, the corresponding signal of telecommunication can be obtained through receiver 7.
As shown in Figure 2, four road precoded signal waveforms, in Fig. 2, after the first data pulse signal shown in i and the stack of the second data pulse signal, amplify, in Fig. 2, the 3rd data pulse signal shown in ii and the 4th data pulse signal also carry out same processing simultaneously, in Fig. 2, in iii, Fig. 2 shown in iv, can obtain respectively 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.Control the phase shift between two-way, the passable relative phase shift that makes two ends reaches pi/2, therefore interferes output to obtain containing accordingly shown in figure v the UWB signal of three dimensional information.The amplitude peak of the corresponding high level signal of A in the drawings, B has represented 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 that signal transmits, can get A or B, corresponding bit 1 and bit 0; Data
phasethe phase information that signal transmits, can get 1 or-1 corresponding bit 1 and bit 0; Data
amplitudefor the positional information that signal transmits, can get ' 01100000 ', ' 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 every kind of different UWB waveform three corresponding dimensions 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 respectively corresponding 1 bit of the amplitude of UWB pulse simultaneously, moreover the phase place of UWB pulse can be transmitted the phase signal of a bit.
As shown in the table, pulse position corresponding to every circuit-switched data in different transmitting bit sequence in 16, data in figure have provided the ' 1 ' position in the cycle of 8 bits, can obtain the data of corresponding four tunnel pulses through figure thus according to different transmitted bits.For example, for 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 respectively ' 00000000 ', ' 01000000 ', ' 00000000 ' and ' 00100000 '.
As shown in Figure 4, four the different signals that contain the first data pulse signal-tetra-data pulse signals that produced 10GHz repetition rate by pulse signal emission source are modulated to respectively the two ends of Dual Drive Mach-Zehnder modulators 2 after stack between two by offset controller 5, what the individual bit ' 1 ' of 10GHz was approximate can think class Gaussian pulse signal.Light signal after modulation is through the transmission of monomode fiber, and then signal converts light signal to electric three-dimensional ultra-broadband signal by receiver 7.
As shown in Figure 5, the first data pulse signal and the stack of the second data pulse signal, the signal waveform obtaining after the 3rd data pulse signal and the stack of the 4th data pulse signal, through the precoding processing in Fig. 2, can in the two ends that drive Dual Drive Mach-Zehnder modulators 2, produce the UWB signal of corresponding three dimensions modulation.
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, the electricity spectrum of the three-dimensional UWB signal obtaining through electric spectrometer equipment, the UWB signal center wavelength of generation is 3.5GHz, and 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 that three-dimensional UWB waveform is corresponding, pulse position signal corresponding to UWB pulse is ' 10 ', ' 10 ', ' 11 ', ' 00 ', ' 01 ' and ' 00 '.Be meanwhile ' 11 ', ' 01 ' by the bit of signal amplitude and phase modulated signal transmission, ' 00 ', ' 11 ', ' 01 ' and ' 10 '.Therefore the signal bit corresponding to UWB signal pulse of each three-dimensional is respectively ' 1011 ', ' 1001 ', ' 1100 ', ' 0011 ', ' 0101 ' and ' 0010 '.
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| CN108429581A (en) * | 2018-01-16 | 2018-08-21 | 北京理工大学 | A Hybrid Modulation and Demodulation Method for Atmospheric Laser Communication |
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