CN106850075A - The system and optimization method of high-frequency vector ripple signal are produced using single electrode modulator - Google Patents
The system and optimization method of high-frequency vector ripple signal are produced using single electrode modulator Download PDFInfo
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- CN106850075A CN106850075A CN201710137258.XA CN201710137258A CN106850075A CN 106850075 A CN106850075 A CN 106850075A CN 201710137258 A CN201710137258 A CN 201710137258A CN 106850075 A CN106850075 A CN 106850075A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5055—Laser transmitters using external modulation using a pre-coder
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
- H04B10/541—Digital intensity or amplitude modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
Abstract
The invention belongs to light carrier radio communication technical field, specially a kind of utilization single electrode modulator produces the system and optimization method of high-frequency vector ripple signal.The scheme of the vector millimeter wave of frequency multiplication is produced in the present invention based on a single electrode modulator, is greatly reduced to photoelectric device bandwidth requirement.And the bit error rate performance of system is improve using the optimization method for flexibly dividing decision region so that receiver sensitivity is improved.The present invention is suitable for any vector signal produced by a single electrode modulator frequency multiplication.
Description
Technical field
The invention belongs to light carrier radio communication technical field, specifically, it is related to a kind of using the generation of single electrode modulator
The system and optimization method of high-frequency vector ripple signal.
Background technology
Up to the present, it has been proposed that the scheme of many generation light vector ripples, simple structure, low cost are to producing vector
Ripple signal is extremely important.It is demonstrated experimentally that based on optical carrier suppression technology light vector millimeter wave can be produced with frequency multiplication.Because frequency multiplication
Phase expands corresponding multiple simultaneously, so generation of the precoding to millimeter wave is extremely important.Produce W-waveband vector millimeter wave
During signal, high-order carrier wave is selected using optical filter, this mode is complex and high cost.It is demonstrated experimentally that one can be used
Individual single electrode modulator produces the millimeter wave of 72GHz, but this millimeter wave not to carry by the frequency multiplication of optical carrier suppression mode six
Data-signal.More than 60GHz, it can provide more bandwidth to the bandwidth of D wave bands for following millimetre-wave attenuator.
The content of the invention
In order to overcome the deficiencies in the prior art, produced using single electrode modulator frequency multiplication it is an object of the invention to provide one kind
The system and its system optimization method of high-frequency vector ripple signal.The present invention is with a single electrode modulator by suppressing centered carrier
Mode frequency multiplication produce millimeter-wave signal, and using optimization arbitration schemes improve communication system bit error rate performance.
Technical scheme is specifically described as follows.
The present invention provides the system that a kind of utilization single electrode modulator produces high-frequency vector ripple signal, it include transmitting terminal and
Receiving terminal；Wherein：
The transmitting terminal is made up of extra-cavity modulator ECL, digital analog converter DAC, electric amplifier EA and single electrode modulator；
The precoded sequence that MATLAB is produced is converted into analog signal by digital analog converter DAC, after two grades of electric amplifier EA amplify,
Signal passes through on the continuous wave laser that single electrode modulators modulate is produced to extra-cavity modulator ECL, and output light carries millimeter wave；
The receiving terminal is by erbium-doped optical fiber amplifier EDFA, optical attenuator ATT, photodetector PD, low-noise amplifier
LNA, blender, electric amplifier EA and real-time oscilloscope composition；The light of transmitting terminal output carries millimeter wave by Erbium-doped fiber amplifier
After device EDFA amplifies, the luminous power for being input to photodetector PD is adjusted by optical attenuator ATT, photodetector PD turns optical signal
Become electric signal；After low-noise amplifier LNA amplifies, the millimeter wave produced with local vibration source mixes electric signal in blender,
Beat frequency is carried out, beat signal is obtained；Beat signal amplifies through electric amplifier EA, finally carries out data acquisition by real-time oscilloscope,
And processed by computer.
In said system, the single electrode modulator is selected from intensity modulator, phase-modulator or directly modulation laser
In any one.
In said system, adjust the bias voltage of single electrode modulator and drive radiofrequency signal peak-to-peak voltage value, just obtain
Two certain rank sidebands, the two sideband beat frequencies obtain corresponding millimeter-wave signal.
In said system, real-time oscilloscope gathered data by computer carry out treatment include following algorithm, 1) under be transformed into
Base band；2) with the twice resampling of baud rate；3) clock is extracted with peak value searching method；4) transverse mode algorithm；5) carrier auxiliary, bag
Including FFT methods carries out the feed-forward skew estimation of offset estimation and blind phase search；6) pi/2 phase mould is eliminated with differential decoding
Paste.
The present invention furthermore provides a kind of optimization method of said system, and the data of real-time oscilloscope collection are by calculating
Machine MATLAB obtains planisphere after being processed, and using the decision method of optimization, i.e., according to the phase information for obtaining, takes each star
The median of seat point repartitions decision region as decision threshold.
Compared to the prior art, the beneficial effects of the present invention are：
(1) present invention is greatly reduced to photoelectric device bandwidth requirement, it is adaptable to any utilization single electrode modulator (intensity
Modulator, phase-modulator and directly modulation laser) frequency multiplication (2 ranks, 3 ranks or higher) produce vector millimeter-wave signal side
Case, including QPSK, 8QAM, 8PSK, 16QAM, 64QAM and higher order QAM.
(2) data of present invention experiment collection obtain final planisphere by computer MATLAB processed offlines.To most
Whole demodulating data makes decisions, higher using traditional average dividing method bit error rate.The present invention is excellent using what is flexibly divided
Change decision method, and result is compared with conventional method, sensitivity improves 3dB, obtain the conclusion of systematic function raising.
Brief description of the drawings
The experimental provision of Fig. 1 embodiments 1.
The modulator transmission curve of Fig. 2 embodiments 1.
The intensity modulator output spectrum of Fig. 3 embodiments 1.
The modulation 4Gbaud data spectrum of Fig. 4 embodiments 1.
Only clock and the unmodulated data spectrum of Fig. 5 embodiments 1.
The input power of Fig. 6 embodiments 1 is 9dBm, transmission rate for the electricity of 4Gbaud is composed.
The optimization of line phase decision threshold is not entered when the input power of Fig. 7 embodiments 1 is 9dBm, transmission rate is 4Gbaud
Demodulating process.
The planisphere of traditional arbitration schemes of Fig. 8 embodiments 1.
The phase distribution of the QPSK signals of Fig. 9 embodiments 1.
The planisphere of the optimization arbitration schemes of Figure 10 embodiments 1.
4Gbaud QPSK signal error rate curves before and after the phase decision threshold optimization of Figure 11 embodiments 1.
Specific embodiment
It is fully described by producing D wave bands in the least based on a frequency multiplication of single electrode modulator six in the present invention below in conjunction with accompanying drawing
Metric wave signal, and the detailed process of systematic function is improved using optimization arbitration schemes.
Embodiment 1
Experimental provision of the invention is as shown in Figure 1.It is put by extra-cavity modulator (ECL), digital analog converter (DAC), electricity
Big device (EA), intensity modulator (IM), optical attenuator (ATT), photodetector (PD), low-noise amplifier (LNA), blender and
Real-time oscilloscope is constituted.The precoded sequence that MATLAB is produced is converted into analog signal by DAC, after two grades of EA amplify, should
Signal is modulated on the continuous wave laser produced to ECL by single electrode IM, and this is transmitting terminal.In receiving terminal, light carries D wave bands millimeter
By after EDFA amplifications, the luminous power for being input to PD being adjusted by ATT, PD converts optical signals into electric signal to ripple.The electric signal
By after LNA amplifications, the frequency produced with local vibration source mixes for 112GHz millimeter waves.The beat signal amplifies through electric amplifier,
Data acquisition is finally carried out by real-time oscilloscope.
The present invention is the principle sake of clarity that millimeter wave will be produced using single electrode modulator frequency multiplication, and definition is input into by ECL
The light field of IM is
Ein(t)=E0cos(ω0t)
To the single electrode modulator with identical input and Y-branch light splitting ratio, the optical signal of output end is
Ideally, it is assumed that extinction ratio is infinitely great and ignores insertion loss.Half-wave voltage is
Vi(t)=Vbi+VmodiV (t), (i=1,2)
The present invention is driven using single electrode, so the peak-to-peak voltage value of another electrode is 0.By adjust bias voltage and
RF driving signal peak-to-peak voltage value, can obtain different output sidebands.Consider that Vb1 is 0, output light field is
Above formula is launched with Bessel functions, obtaining output light field is
Section 1 can suppress light carrier for 0 rank Bessel functions, and the repressed light field of light carrier is
Bias voltage is neatly adjusted in an experiment and radiofrequency signal peak-to-peak voltage value is driven, and just can obtain two certain ranks
Sideband, the two sideband beat frequencies are that can obtain corresponding millimeter-wave signal.
In embodiment 1, extra-cavity modulator power output is 16dBm, and line width is 100kHz, completely tunable in C-band.By force
Degree modulator model FTM H74M-5208, transmission curve by bias point in the present invention as shown in Fig. 2 be set to 5.7V, 1GHz
Place's half-wave voltage is 2.7V, and the peak-to-peak value of driving voltage is 20.2V, and bandwidth is 37GHz, and insertion loss is 4dB.Digital analog converter
Sample rate be 80GSa/s, with a width of 20GHz, effective word 24GHz at is long about 4.Two-stage electric amplifier model
SHF804 and SHF816, free transmission range is respectively 30kHz~45GHz and 17GHz~27GHz.The passband model of low-noise amplifier
It is 110~170GHz to enclose, and average gain is 16dB, and saturation power is 2dBm.The sample rate of real-time oscilloscope is 120GSa/s, band
Width is 45GHz.
Because phase also occurs corresponding change while frequency shift after frequency multiplication, so QPSK signal precodings very must
Will.The code phase that prelists is preferable QPSK signal phases (π/4,3 π/4,5 π/4,1/ α of 7 π/4).It is based on six frequencys multiplication in the present invention
D wave band millimeter waves, so α values be 6.
The QPSK sequences of precoding are produced with MATLAB, then the penetrating for the DAC converting analogues of 80GSa/s by sample rate
Frequency signal.The radiofrequency signal is amplified by the two-stage electric amplifier that SHF 804 and SHF816 are constituted, the free transmission range of two electric amplifiers
Respectively 30kHz~45GHz and 17GHz~27GHz.By the intensity modulator of model FTM H74M-5208, after amplification
Radiofrequency signal is modulated onto on the C-band laser of ECL generations.It is 5.7V, the peak-to-peak value of driving voltage rationally to set bias voltage
During for 20.2V, just generate the light that frequency is 144GHz and carry millimeter wave, the spectrum of modulator output is as shown in Figure 2.When modulation
When radiofrequency signal is operated at 24GHz, baud rate is 4Gbaud, the spectrum of transmitting terminal is as shown in Figure 3.When only clock and it is uncomfortable
When making any data, transmitting terminal spectrum is as shown in Figure 4.
In receiving terminal, light carries millimeter wave by that after EDFA amplifications, can decay so that control input is to a width of by ATT
Luminous power in the D wave band photodetectors of 150GHz.The optical millimeter wave signal that photodetector will be received is transformed into electric millimeter
Ripple signal, is then amplified by low-noise amplifier.By the blender of D wave bands, the signal after amplification is with 112GHz's
Local oscillator Millimeter-Wave Source mixes, and carries out beat frequency, and frequency spectrum is as shown in Figure 7.Electric amplifier at 50GHz is operated in by the signal after beat frequency
Amplify, by real-time oscilloscope gathered data.
By computer MATLAB treatment, the algorithm for using successively includes the data of real-time oscilloscope collection：1) under
It is transformed into base band；2) with the twice resampling of baud rate；3) clock is extracted with peak value searching method；4) transverse mode algorithm；5) carrier wave
Recover, including FFT methods carry out the feed-forward phase estimation of offset estimation and blind phase search；6) with differential decoding eliminate π/
2 phase ambiguities.Corresponding planisphere is as shown in fig. 7, planisphere, transverse mode are calculated respectively after initial data planisphere, clock recovery
Planisphere after planisphere, phase recovery after planisphere, frequency retrieval after method.
Planisphere to finally giving makes decisions, and traditional method is averagely to divide whole decision region, such as Fig. 8 institutes
Show.Operation MATLAB orders are as follows, make decisions (note, BER_Ix is the bit error rate of Ix roads signal, by that analogy)：
BER_Ix=0
BER_Qx=0.0063488
BER_Iy=0
BER_Qy=0.0063488
BER=0.0031744
The bit error rate being calculated is up to 0.0031744.Be can see from the final planisphere for obtaining, A and B, B and C, C
It is smaller with the distance between D, and the distance between A and D is larger.The demodulating data that will be finally given with MATLAB is further located
Reason, very can clearly compare the phase magnitude relationship of each constellation, as shown in Figure 9.The present invention proposes a kind of optimization
Arbitration schemes, whole decision region are neatly divided, as shown in Figure 10.According to the distance between each constellation, by angle
Scope is respectively divided into 15 °~90 °, 90 °~165 °, 165 °~270 ° and 270 °~15 °.Operation MATLAB orders are as follows, its
Middle X_phase is the phase information for obtaining, and phase () is the order that MATLAB seeks plural number phase, and mod () is asked for MATLAB
Cofunction, Xdata_cpe, X_phase are constellation of complex point：
X_phase=phase (Xdata_cpe)/pi*180-15；
X_phase=mod (X_phase, 360)；
figure；plot(X_phase,'.')；
X_i1=(X_phase>=260) * 2-1；
X_i2=((X_phase<260)&(X_phase>=75)) * 2-1；
Judgement is re-started, the result for obtaining is less than 3.8 × 10-3The hard-decision forward error correction bit error rate.Sentence with traditional
Certainly method is compared, and causes that systematic function is greatly improved using the decision method of optimization.
By adjusting optical attenuator, the luminous power size of control input to photodetector has obtained being used under different capacity
The bit error rate of traditional decision method and optimization decision method, and it is as shown in figure 11 to be depicted as ber curve.Can from figure
Arrive, the sensitivity of 3dB improve than traditional decision method using the decision method of optimization, and this performance raising with light
The increase of detector input power and further improve.
Claims (5)
1. the system that a kind of utilization single electrode modulator produces high-frequency vector ripple signal, it includes transmitting terminal and receiving terminal；It is special
Levy and be,
The transmitting terminal is made up of extra-cavity modulator ECL, digital analog converter DAC, electric amplifier EA and single electrode modulator；Number
The precoded sequence that MATLAB is produced is converted into analog signal by weighted-voltage D/A converter DAC, after two grades of electric amplifier EA amplify, letter
On number continuous wave laser produced to extra-cavity modulator ECL by single electrode modulators modulate, output light load millimeter wave；
The receiving terminal is by erbium-doped optical fiber amplifier EDFA, optical attenuator ATT, photodetector PD, low-noise amplifier LNA, mixed
Clutch, electric amplifier EA and real-time oscilloscope composition；The light of transmitting terminal output carries millimeter wave by erbium-doped optical fiber amplifier EDFA
After amplification, the luminous power for being input to photodetector PD is adjusted by optical attenuator ATT, photodetector PD converts optical signals into electricity
Signal；Electric signal carries out beat frequency by after low-noise amplifier LNA amplifications, producing millimeter wave to mix in blender with local vibration source,
Obtain beat signal；Beat signal amplifies through electric amplifier EA, finally carries out data acquisition by real-time oscilloscope, and by computer
Processed.
2. system according to claim 1, it is characterised in that the single electrode modulator is selected from intensity modulator, phase
In modulator or directly modulation laser any one.
3. system according to claim 1, it is characterised in that the bias voltage of adjustment single electrode modulator and drive radio frequency
Signal peak-to-peak magnitude of voltage, just obtains two certain rank sidebands, and the two sideband beat frequencies obtain corresponding millimeter-wave signal.
4. system according to claim 1, it is characterised in that real-time oscilloscope gathered data carries out treatment bag by computer
Include following algorithm, 1）Under be transformed into base band；2）With the twice resampling of baud rate；3）Clock is extracted with peak value searching method；4）
Transverse mode algorithm；5）Carrier auxiliary, including FFT methods carry out offset estimation and the feed-forward skew of blind phase search is estimated；6）
Pi/2 phase is eliminated with differential decoding to obscure.
5. a kind of optimization method of system as claimed in claim 1, it is characterised in that the data of real-time oscilloscope collection are by meter
Calculation machine MATLAB obtains planisphere after being processed, and using the decision method of optimization, i.e., according to the phase information for obtaining, takes each
The median of constellation point repartitions decision region as decision threshold.
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Cited By (1)
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| CN109697336A (en) * | 2019-01-29 | 2019-04-30 | 中国电子科技集团公司第二十九研究所 | A kind of amplitude equalization parameters simulation method that dual-modulator multiwavelength laser generates |
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| CN109697336A (en) * | 2019-01-29 | 2019-04-30 | 中国电子科技集团公司第二十九研究所 | A kind of amplitude equalization parameters simulation method that dual-modulator multiwavelength laser generates |
| CN109697336B (en) * | 2019-01-29 | 2022-06-28 | 中国电子科技集团公司第二十九研究所 | Amplitude balance parameter simulation method generated by dual-modulator multi-wavelength laser |
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