CN103873110B - Based on the generation device of the multiband ultra-wide band radio-frequency signal of Dual Drive modulator - Google Patents
Based on the generation device of the multiband ultra-wide band radio-frequency signal of Dual Drive modulator Download PDFInfo
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Abstract
A kind of production method of the multiband ultra-wide band radio-frequency signal based on Dual Drive modulator of the communications field, by loading the Gaussian pulse string containing different length metasequence on two phase-modulators of Dual Drive modulator respectively, then regulate amplitude and the relative phase shift of two Gaussian pulse string signals respectively, make the transverse electric mode light signal exported through Polarization Controller produce multiband ultra-wide band radio-frequency signal via Dual Drive modulator; The transverse electric mode through Polarization Controller is the invention enables to produce multiband ultra-wide band radio-frequency signal flexibly by Dual Drive modulator, therefore greatly reduce the complexity of flexible UWB pulse signal generation device, achieve low cost and the MB of simple and flexible UWB pulse signal produce.
Description
Technical field
What the present invention relates to is a kind of method and device of the communications field, specifically a kind of by Dual Drive modulator (DDMZM, Dual ?DriveMachZehnderModulator, also referred to as Dual Drive Mach zehnder modulators) obtain method and the device of multiwave ultra broadband (Multiband ?Ultrawideband, MB ?UWB) rf wireless signal.
Background technology
UWB ultra-broadband signal as a kind of valid wireless transmission technology, not only can with existing wireless technology simultaneously, and the transmitting power of system can be reduced, therefore be studied widely.
UWB signal in wireless system is mainly divided into two classes: the UWB signal (UWBpulse) of impulse form, this signal transmits corresponding signal by discrete pulse signal, the transport tape broadband of the signal of telecommunication is between 3.1GHz to 10.6GHz, therefore the ultra-broadband signal produced has very high bandwidth, is all in same electric wave length; Another is multiwave UWB signal (MultibandUWB, MB ?UWB), the multiple UWB signal formations of frequency higher than 500MHz are loaded with by the multiple wavelength in the scope that UWB transmits band, wavelength on each signal of telecommunication of this signal is less, therefore can effectively elevator system signal transmission flexibility ratio and reduce the granularity of data, the electric bandwidth demand of Receiver And Transmitter obviously reduces simultaneously, has application prospect widely.Due to MB ?the transmission range of UWB signal is shorter only has several meters or tens meters, produced by the technology of photonic propulsion and transmit MB ?the technology of UWB signal be suggested, UWBoF (UWBoverfiber) technology produced by the technology of photonic propulsion and transmission MB ?UWB signal, effectively can overcome the restriction of transmission range, receiving terminal by photodetection by MB ?UWB signal be transformed into electrical domain.Therefore by the technology of photonic propulsion produce MB ?UWB signal be very significant.
Through finding the retrieval of prior art, OSAOpticsExpress in 2008, the paper of the 16th volume 10 phase: HongweiChen, TiliangWang, MoLi, MinghuaChen, andShizhongXie, the loyalty of passing away of university of " OpticallytunablemultibandUWBpulsegeneration " Tsing-Hua University waits people to propose, by PPG (sequence timer, 1010 pulse trains of the low repeatability PulsePatternGenerator) produced are by the phase-modulator of cascade, then the signal of output is entered the optical fiber that polarization is relevant, at output because the transfer function in two polarized components is different, cause the pulse signal formed up and down, through reasonably regulating, can to obtain low speed bandwidth be in the multiband UWB signal of 500MHz one.But this technology production process too complexity needs cascaded modulator, multiple devices such as polarization maintaining optical fibre transmission.
Further retrieval finds, the IEEEPhotonicsTechnologyLetter delivered for 2014, the paper of the 26th volume 2 phase: ManuelRius, MarioBolea, JoseMora, BeatrizOrtega, andJos é Capmany, " Multiband ?UWBsignalsgenerationbasedonincoherentmicrowavephotonicfi lters ", the Jos é Capmany seminar of Spain's Valencia science and engineering proposes wide spectrum light source and obtains multiple wavelength through array waveguide grating, wherein odd and even number wavelength carries out forward modulation and the back-modulation of pulse strength respectively, corresponding tape pulse signal is obtained on each wavelength, the dispersion interaction through optical fiber can obtain different electrfic centre carrier wave output MB ?UWB signal.But system has quite complicated structure, thus make the high cost of production process.
Summary of the invention
The present invention is directed to prior art above shortcomings, a kind of production method and device of the multiband ultra-wide band radio-frequency signal based on Dual Drive modulator are provided, same data delay bit is loaded in the two-arm of DDMZM respectively, thus obtain corresponding MB ?UWB signal, by change metasequence Data duplication in the repetition rate of pulse signal in sequence and pulse number can variable generation MB ?the centre wavelength of UWB signal and bandwidth, substantially reduce the complexity of system simultaneously.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of production method of the multiband ultra-wide band radio-frequency signal based on Dual Drive modulator, two phase-modulators of Dual Drive modulator load Gaussian pulse string containing different length metasequence respectively, then amplitude and the relative phase shift of two Gaussian pulse string signals is regulated respectively, transverse electric mode (TE pattern, namely electric vector is vertical with the direction of propagation) light signal exported through Polarization Controller is made to produce multiband ultra-wide band radio-frequency signal via Dual Drive modulator.
Time delay between the described Gaussian pulse string containing different length metasequence is 1 bit.
Described relative phase shift refers to: control the phase shift between two Gaussian pulse string signals by bias voltage.
Described metasequence refers to the binary sequence of a 2bit, is preferably 10.
Described Gaussian pulse string signal refers to: baud rate be 6.5Gb/s ?14Gb/s, frame length is 128bit, and be provided with in fixed position 8,12,16 or 20 repeat metasequences.
Described fixed position is preferably the original position of signal.
Described relative time delay is realized by phase shifter, particular by the relative time time delay regulated between the Gaussian pulse string being input to two radio-frequency heads.
Described Dual Drive modulator comprises two phase-modulator (PM independently modulated, PhaseModulator), two phase-modulators are based on different size, the signal of telecommunication (as Gaussian pulse signal) of relative position and type drives, and control the relative phase shift between two phase-modulator output optical signals by the bias voltage putting on Dual Drive modulator, thus make the light signal of two phase-modulations carry out coherent interference at output port, obtain multiple different-waveband MB ?UWB signal, regulate the number that metasequence repeats simultaneously, realize the control to each wave band data bandwidth.
Described multiband ultra-wide band radio-frequency signal refers to: centre wavelength is with the pulse signal being wider than 500Mhz between 3.1 ?10.6GHz.
Described ultra-wide band radio-frequency signal refers to:
wherein: E
outfor the light field that Dual Drive modulator exports, E
infor the light field of input signal, V π is the half-wave voltage of phase-modulator, V
dcfor the bias voltage of phase-modulator, the signal being input to modulator two ends is S (t), and τ is the relative time delay between two pulse signals, when signal can obtain this light field E after DDMZM output is interfered
outdC component be:
wherein: V
dcfor DC offset voltage, for controlling the relative phase difference between two ways of optical signals.
By the signal baud rate regulating sequence timer to export, the centre wavelength of the MB ?UWB signal of generation can change thereupon, simultaneously by changing the number that metasequence occupies in each 128bit sequence, effectively can regulate the electric bandwidth producing signal.
The amplitude peak of the output signal of described sequence timer is 2.5V.
The present invention relates to a kind of device realizing said method, comprise: Polarization Controller, Dual Drive modulator, sequence timer, electricity line of time delay and direct current biasing, wherein: the signal input part of Dual Drive modulator is connected with Polarization Controller and receives transverse electric mode light signal, the first output series electrical line of time delay successively of sequence timer, direct current biasing is also connected with the first radio-frequency head of Dual Drive modulator and transmits the Gaussian pulse string containing metasequence, second output of sequence timer is connected with the second radio-frequency head of Dual Drive modulator and transmits the Gaussian pulse string containing different length metasequence.
Technique effect
The present invention by single Dual Drive modulator achieve adjustable MB ?the generation of UWB signal, greatly reduce the complexity producing signal process, and improve flexibility.
Accompanying drawing explanation
Fig. 1 is the simplified schematic diagram of Dual Drive modulator structure.
Fig. 2 be produce different MB ?the principle schematic of UWB ultra-broadband signal;
Fig. 3 is the schematic flow sheet of embodiment 1.
When Fig. 4 is the baud rate when PPG output signal in embodiment, the MB of generation ?UWB ultra-broadband signal centre wavelength situation about thereupon changing;
Fig. 5 be in embodiment in the 128bit sequence of PPG output signal, the number of metasequence changes when, the MB of generation ?UWB ultra-broadband signal bandwidth situation about thereupon changing;
In figure: light source 1, Polarization Controller 2, Dual Drive modulator 3, sequence timer 4, electric line of time delay 5, first radio frequency amplifier 6, second radio frequency amplifier 7, DC offset voltage 8, high-speed photodetector 9, for the electric spectrometer 10 that detects and oscilloscope 11, electric shunt 12.
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 present embodiment as described in Figure 3, the sequence length produced by sequence timer 4 is the sequence of 128bit, wherein then be divided into two-way by electric shunt 12 containing the continuous element sequence that data transfer rate is variable, amplify two radio-frequency heads being loaded into Dual Drive modulator 3 respectively, wherein: the relative position of signal is controlled by the line of time delay 5 of electricity, makes the delay between signal be 1 bit period.By controlling parameters, output signal interference obtains UWB pulse signal can obtain corresponding signal waveform and electricity spectrum respectively through oscilloscope 11 and electric spectrometer 10.
Described signal shunt, is divided into energy by the data sequence of generation identical, two signals containing same data.
Dual Drive modulator 3 is as described in Figure 1 made up of two phase-modulators that can independently modulate 3, half-wave voltage is about 4V, two phase-modulators 3 can use different size, the signal of amplitude and type carries out driving modulation, bias voltage 8 simultaneously by controlling Dual Drive modulator 3 effectively can control the relative phase shift between two phase-modulator 3 output optical signals, thus make the light signal of two phase-modulations carry out coherent interference at output port, obtain flexibility and changeability MB ?UWB pulse signal.
Described Gaussian pulse signal is the burst produced by sequence timer 4, the output speed of sequence timer 4 is by 6.5Gb/s ?14Gb/s, the sequence of synchronous signal is foregoing 128bit length, wherein containing 8 ?20 continuous print metasequences.The amplitude peak simultaneously outputed signal is 2.5V.
The device realizing said method related in the present embodiment, comprise: Polarization Controller 2, Dual Drive modulator 3, sequence timer 4, electricity line of time delay 5, first radio frequency amplifier 6 and direct current biasing 8, wherein: the signal input part of Dual Drive modulator 3 is connected with Polarization Controller 2, in two outputs of sequence timer 4, first output is successively through electric line of time delay 5, first radio frequency amplifier 6 is connected with the first radio-frequency head of Dual Drive modulator 3 with direct current biasing 8, second output is connected with the second radio-frequency head of Dual Drive modulator 3 through the two the first radio frequency amplifiers 6.
Described Polarization Controller 2 controls the polarization state entering the light signal of Dual Drive modulator 3, makes transverse electric mode enter Dual Drive modulator, thus TE pattern is entered light signal that modulator obtains maximum output.
The light signal that described light source 1 sends obtains corresponding TE pattern through Polarization Controller 2 (PC), then enters Dual Drive modulator 3.Two Gaussian pulse signals are loaded into two prevention at radio-frequency port of Dual Drive modulator 3 through different amplifications and timing_delay estimation, by the amplitude of control signal, the bias voltage 8 of relative position and modulator 3, different UWB ultra-broadband signals can carry out detection at output through PD and obtain.
Gaussian pulse signal from the signal amplitude being amplified to needs by a small margin, is amplified corresponding Gaussian pulse signal by radio circuit by the first described radio frequency amplifier 6, and its gain is 20dB.
Described signal time postpones to realize mainly through the phase shifter of electrical domain, transmission range particular by adjustment radiofrequency signal obtains the relative time delay between two paths of signals, can 200ps be postponed at most, according to different baud rates, need the time delay of signal to be adjusted to corresponding 1 bit.
Described Polarization Controller 2 controls the polarization state entering the light signal of Dual Drive modulator 3, makes transverse electric mode (TE) can enter modulator 3, thus makes the light signal of output maximum.
As shown in Figures 2 and 3, the radio-frequency head of Dual Drive modulator 3 receive respectively two amplify after Gaussian pulse signal V1 (t)=S (t) and V
2(t)=S (t-τ), wherein: S (t) for above-mentioned sequence length be 128 bits, the sequence containing variable continuous element sequence, τ is the relative time delay of signal.
The output signal square of Dual Drive modulator 3 is
wherein: E
infor the light field of input signal, V
πfor the half-wave voltage of phase-modulator, V
dcfor the bias voltage of phase-modulator, the signal being input to modulator two ends is S (t), and τ is the relative time delay between two pulse signals, is T in this scheme
0equal bit period, when signal can obtain this light field E after DDMZM output is interfered
outdC component be:
wherein: V
dcfor DC offset voltage, for controlling the relative phase difference between two ways of optical signals.
By regulating PPG to produce the baud rate of signal, the MB of generation ?the centre wavelength of UWB signal can change thereupon, simultaneously by changing the number that metasequence occupies in each 128bit sequence, effectively can regulate the electric bandwidth producing signal.
Simultaneously by signal baud rate and the corresponding signal bit of signal projector (PPG) 4, different UWB signal waveforms and corresponding electricity spectrum can be obtained.
As Fig. 4 (a) gives when baud rate is 6.5Gb/s, 8Gb/s, 9.5Gb/s, 11Gb/s, 12.5Gb/s and 14Gb/s, in 128 bit sequences, the signal containing 8 metasequences exports; Fig. 4 (b) gives at the variable electric spectrogram of centre wavelength, and the centre wavelength of its correspondence is respectively 3.2,4.0,4.6,5.4,6.2, and 6.8GHz.
As Fig. 5 (a) gives when baud rate is 12.5Gb/s, in 128 bit sequences, containing 8,12,16 and 20 metasequences, namely the signal of ' 10 ' sequence exports; Fig. 5 (b) gives the electric spectrogram at adaptive-bandwidth, its 10 ?dB bandwidth be respectively 1.3,0.9,0.5 and 0.4GHz.
Claims (1)
1. the generation device based on the multiband ultra-wide band radio-frequency signal of Dual Drive modulator, it is characterized in that, comprise: Polarization Controller, Dual Drive modulator, sequence timer, electricity line of time delay and direct current biasing, wherein: the signal input part of Dual Drive modulator is connected with Polarization Controller and receives transverse electric mode light signal, the first output series electrical line of time delay successively of sequence timer, direct current biasing is also connected with the first radio-frequency head of Dual Drive modulator and transmits the Gaussian pulse string containing metasequence, second output of sequence timer is connected with the second radio-frequency head of Dual Drive modulator and transmits the Gaussian pulse string containing different length metasequence, two phase-modulators of described Dual Drive modulator load Gaussian pulse string containing different length metasequence respectively, then amplitude and the relative phase shift of two Gaussian pulse string signals is regulated respectively, the transverse electric mode light signal exported through Polarization Controller is made to produce multiband ultra-wide band radio-frequency signal via Dual Drive modulator,
Time delay between the described Gaussian pulse string containing different length metasequence is 1 bit;
Described relative phase shift refers to: control the phase shift between two Gaussian pulse string signals by bias voltage;
Described metasequence refers to the binary sequence of a 2bit;
Described metasequence is 10;
Described Gaussian pulse string signal refers to: baud rate be 6.5Gb/s ?14Gb/s, frame length is 128bit, and be provided with in fixed position 8,12,16 or 20 repeat metasequences;
Described fixed position is the original position of signal;
Described multiband ultra-wide band radio-frequency signal refers to: centre wavelength is with the pulse signal being wider than 500Mhz between 3.1 ?10.6GHz;
Described ultra-wide band radio-frequency signal refers to:
wherein: E
outfor the light field that Dual Drive modulator exports, E
infor the light field of input signal, V
πfor the half-wave voltage of phase-modulator, V
dcfor the bias voltage of phase-modulator, the signal being input to modulator two ends is S (t), and τ is the relative time delay between two pulse signals, when signal can obtain this light field E after DDMZM output is interfered
outdC component be:
wherein: V
dcfor DC offset voltage, for controlling the relative phase difference between two ways of optical signals.
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Patent Citations (8)
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| CN1599288A (en) * | 2003-09-18 | 2005-03-23 | 电子科技大学 | Super-broadband integral optical waveguide microwave subcarrier electromagnetic wave receiver |
| CN101197619A (en) * | 2007-12-21 | 2008-06-11 | 清华大学 | Generation system for light loaded multi-frequency band ultra-broadband MB-UWB impulse |
| CN101848011A (en) * | 2010-04-21 | 2010-09-29 | 上海交通大学 | Generation device of bipolar ultra wide band monocyclic pulse |
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