CN110061783A - A kind of optical-fiber wireless Transmission system for completing I/Q modulation based on both arms MZ Mach-Zehnder - Google Patents
A kind of optical-fiber wireless Transmission system for completing I/Q modulation based on both arms MZ Mach-Zehnder Download PDFInfo
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
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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
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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
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/613—Coherent receivers including phase diversity, e.g., having in-phase and quadrature branches, as in QPSK coherent receivers
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/614—Coherent receivers comprising one or more polarization beam splitters, e.g. polarization multiplexed [PolMux] X-PSK coherent receivers, polarization diversity heterodyne coherent receivers
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Abstract
The present invention relates to technical field of photo communication, have used a both arms MZ Mach-Zehnder that the I/Q conversion that traditional I/Q modulator completes QPSK signal is substituted, and the signal of generation is used for the transmission of optical-fiber wireless system.The present invention is at optics baseband transmission end, since traditional I/Q modulator is substituted, technical costs can be reduced, and is conducive to the integrated of the following photonics.Signal first passes through the single mode optical fiber of 40km after generating, recycled the ka wave band (26.5-40GHz) that can accommodate large bandwidth signal to carry out 5m wireless transmission, which is widely used at present in 5G mobile communications network.Being transmitted rear signal will do it a series of offline DSP processing, including offset estimation, carrier phase recovery, the elimination of DC terms, clock recovery, dispersion compensation etc., can preferably restore QPSK signal.The system can guarantee the preferable bit error rate, the impact of performance with higher.
Description
Technical field
The present invention relates to optical fiber radio communication fields, are based on both arms MZ Mach-Zehnder more particularly, to one kind
Complete optical fiber-wireless transmitting system of I/Q modulation.
Background technique
With the arrival in 5G epoch, enhanced mobile broadband, super reliable low time delay and magnanimity machine type communication are thirdly big
Application scenarios.5G is intended to bring the network connection of higher bandwidth rates, lower more reliable time delay and larger capacity to user.
And the realization of enhanced mobile bandwidth scenarios requires that message transmission rate is significantly increased and increases data transfer bandwidth, with full
The applications such as foot following ubiquitous virtual reality and augmented reality (VR/AR), 4k/8k HD video, artificial intelligence.Cause
This, how research realizes that ultrahigh speed mobile data communication is a very popular project.In order to preferably meet enhanced shifting
The technology of signal is transmitted in the requirement of dynamic bandwidth scenarios using the system that the millimere-wave band and spread fiber of wide bandwidth be combined with each other
It is suggested therewith.
Ka wave band is a part of the microwave band of electromagnetic spectrum, and the frequency range of Ka wave band is 26.5-40GHz.Ka generation
Table the surface of K (K-above), in other words, which is directly higher than K-band.Ka wave band is also referred to as 30/20GHz wave
Section is commonly used in satellite communication.The most important feature of Ka wave band is exactly that frequency band is wider, and the bandwidth that is generally available of C frequency range is
500MHz~800MHz；The available bandwidth of Ku frequency range is 500MHz~1000MHz；And the available bandwidth of Ka frequency range can reach
3500MHz.Therefore, Ka band satellite communication system can be high speed satellite communication, gigabit grade broadband digital transmission, high-resolution
Degree TV (HDTV), etc. new business a kind of brand-new means are provided.Just because of the wide band advantage of Ka wave band, the present invention is just
The composition that system is carried out using the corresponding electromagnetic horn that can generate the wave band makes optical fiber and wirelessly be combined with each other to transmit signal.
It is also to carry out optical-fiber wireless to transmit being to realize that wireless network and optical-fiber network exist in terahertz wave band and millimeter wave band
The key of physical layer Seamless integration-, optical fiber-wireless topology based on fine (RoF) technology of wireless ultraphotic are to realize in physical layer wirelessly
The ideal chose of signal and optical signal bumpless transfer.And advanced Fibre Optical Communication Technology can be between optics and radio art
Realize high-precision direct waveform transfer.In order to realize bumpless transfer, by optics-Terahertz converter be configured to optical heterodyne with
Realize optics-Terahertz conversion.High speed light heterodyne technology can also directly form radio signal from input optical signal.Such as
The rapid development of the present, integrated optical circuit and device technology makes it possible that high-precision signal generates, and signal quality can
It compares favourably with radio communication.Therefore, high-order Multilevel modulation and advanced optical technology can also reinforce building for the system.
However, since the configuration of radio-optical signal converter has difficulties, all -fiber-Radio Link (optical fiber-is wireless-optical fiber company
Connect and/or the Double Faces to Install) be still a problem.
Traditional road I and the modulation of the road Q are modulated using an I/Q modulator, and light I/Q modulator is by two mach zhenders
Modulator and 90 ° of phase-shifters composition.Signal is modulated respectively, and two-way light carrier is mutually orthogonal, generally with sin and
Cos is indicated.I, Q two paths of signals modulates latter transmitting respectively, to improve the utilization rate of frequency spectrum.In all -fiber-Radio Link
In system building engineering, in order to which future preferably carries out integrated, need constantly to reduce the cost of system, it is therefore desirable to whole
The inexpensive consumptive material that replaceable high cost consumptive material is found in a system, realizes identical system effect.The problem values must be goed deep into visiting
It begs for.
Summary of the invention
The present invention is to propose a kind of based on the realization of both arms MZ Mach-Zehnder the shortcomings that overcoming the above-mentioned prior art
The optical-fiber wireless Transmission system of I/Q modulation solves the problems, such as to reduce following optical fiber-Radio Link integrated cost.Of the invention
Technical solution is: a kind of optical-fiber wireless Transmission system for realizing I/Q modulation based on both arms MZ Mach-Zehnder, wherein packet
Include following steps:
QPSK signal, signal length 8192 are first generated in MATLAB, bit rate is that 20Gbit/s signal length connects again
Do shaping pulse, be transmitted in DAC after being quantified；
The road I and the road Q that QPSK signal is generated with the digital analog converter (DAC) of 80Gsa/s, are respectively connected to thereafter two lines again
Property electric amplifier (EA), the amplitude and power of amplified signal；
The road I for passing through amplification and the road Q are respectively connected to the signal port of both arms MZ Mach-Zehnder, the optical fiber of modulator
Mouth is connected to the channel one in outside cavity gas laser (ECL-1), and constantly changes the DC offset voltage of modulator, reaches half-wave
Electrical voltage point not change arbitrarily after selecting the electrical voltage point, avoid enter into inelastic region and bring serious nonlinear effect；
The transmission that the signal light come passes through 40km single mode optical fiber is modulated, is generated with channel outside cavity gas laser (ECL-2) two
Local oscillator light coupled, need to be added Polarization Controller (PC) before this before local oscillator light is coupled to guarantee and signal light
Polarization state it is consistent, just can preferably carry out coherent operations；
Signal after coupling controls its optical power for inputting photodetector (PD) by adjustable optical attenuator (VOA), protects
For card in 0dBm hereinafter, avoiding breaking PD, the applied voltage of the PD is 3.1V, while can constantly change the optical power into PD,
Test error performance；
After photoelectric conversion, beat frequency then accesses a linear EA again and carries out electric signal signal at an intermediate-freuqncy signal
Amplification, the horn antenna (HA) for finally accessing Ka wave band again transmit signals to free space；
Signal adjusts the position and direction of receiving end HA, collecting signal after the wireless transmission of 5m, and is connected to
The oscillograph of 80Gsa/S, data are collected, in case subsequent DSP is handled；
The operation such as carry out DSP processing, such as the recovery of offset estimation, phase carrier, clock recovery by the signal of acquisition.And
Power, the distance of wireless transmission etc. before the changeable parameter of continuous regulation experiment device, such as input PD, calculate corresponding
The bit error rate draws curve graph.And can also be according to performance and delay when DSP is calculated the considerations of, constantly change direct current elimination algorithm
In tap length, choose suitable tap length.
Compared with prior art, advantage are as follows: the present invention can use a both arms Ma Zhen Zeng De at optics baseband transmission end
Your modulator carries out the modulation on the road QPSK signal I and the road Q, both can be while improving the availability of frequency spectrum, can also be well
Cost is reduced to original using the 1/3 of I/Q modulator.
Optical fiber is transmitted and is combined with wireless transmission, realizes 40km's by the advantages of recycling the wide bandwidth of Ka wave band
Optical fiber adds the radio transmission of 5m.
Present system also uses optical heterodyne detection structure, is conducive to the detection of small-signal, and remolding sensitivity is directly visited
Survey improves several orders of magnitude.It under certain condition,, still can be with even if signal light power very little as long as local oscillator light is sufficiently strong
Obtain required intermediate frequency output electric current.The structure has good space and polarization distinguishing ability simultaneously.Due to signal light and this
Shake light must directive photodetector in the same direction, and to keep identical polarization direction, it means that optical heterodyne detection
Inherently have the height distinguishing ability to detection light direction and the distinguishing ability to detection light polarization direction.And it is suitably selecting
In the case where taking local oscillation optical power, higher signal-to-noise ratio can be obtained.
In offline DSP processing, it has even more been put forward for the first time the algorithm for eliminating superelevation peak direct current caused by phase noise, it should
The execution of operation is more conducive to next CMA equilibrium, restores original signal, reduces the bit error rate, improve the performance of system.
Detailed description of the invention
Fig. 1 is the internal structure of both arms MZ Mach-Zehnder.
Fig. 2 is the bias voltage by adjusting both arms MZ Mach-Zehnder, measures light with -11dbm received optical power
The bit error rate of back-to-back (OBTB) reception signal.
Fig. 3 is the optical-fiber wireless Transmission system block diagram that I/Q modulation is realized based on both arms MZ Mach-Zehnder.
Fig. 4 is the spectrogram by oscillograph sampled signal.
Fig. 5 is the bit error rate for measuring the received optical power of -6dBm to -12dBm, has passed the experiment of the optical fiber and 2m of 40km
As a result.
Fig. 6 is the bit error rate for measuring different radio under.
Fig. 7 is the discrete DSP flow figure in receiving end.
Fig. 8 is after 40km SMF and 2m wireless transmission, to receive the actual measurement of signal using -7dBm received optical power (ROP)
The bit error rate with average symbol length change curve.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.
Fig. 3 is the experiment flow block diagram of this invention.Random pseudo-order is first generated in transmitting terminal, data length is
8192, QPSK mapping is carried out, the QPSK signal of generation is using pulsatile once shaping, up-sampling, finally further according to DAC's
Quantized value quantization leaves I, Q two paths of data to corresponding amplitude size, and is passed two paths of signals using DAC load data program
It is defeated into DAC.The DAC sampling rate of this system is 80Gsa/s, and the rate of QPSK signal is 20Gbit/s.
The signal come out from the road I of DAC and the road Q is amplified by linear EA respectively, amplified two paths of signals access
The signaling interface of both arms MZ Mach-Zehnder, and for the modulator, need to access light carrier, the frequency of light carrier to it
For 1549.425nm, power 14.5dBm.Before being modulated to the signal come in, first light passing is needed, bias voltage is added,
Output end connects power meter, is just connecing or is being reversely connected voltage and is finding the maximum value of output power, writes down the value, and constantly change biasing
The value of voltage makes its output power maximum power value reduce 3dBm, and voltage at this moment is exactly both arms Ma Zhen Zeng Deer modulation
The half-wave voltage of device.It is exactly adjusted to this point, QPSK signal just may make to complete the I/Q up-conversion in optical path.If no
It is adjusted to this half-wave voltage point, the amplitude of signal will enter nonlinear area, and it will cause the serious distortions of signal, thus
The bit error rate of reduction system.Fig. 2 is back-to-back and receives the experimental result that power is -11dBm, and 0.6V is half-wave voltage point, when
When modulation voltage is not at this, the bit error rate can be deteriorated.
Modulating the signal light completed will transmit by the single mode optical fiber of 40km, this optical fiber dispersion values at 1550nm are 0.1-
6.0ps/nm*km is lost as 0.22dB/km, therefore will cause the loss of 8.8dB, and the compensation of the loss will be handled in offline DSP
In dispersion compensation algorithm compensate.
The frequency of local oscillator light is 1549.65nm, there is the frequency shift (FS) of 28.8GHz, power 8dBm with signal light.The frequency
Offset must be sufficiently large, the shadow for the interference that the signal after beat frequency can just do not generated by DC component and signal light beat frequency
It rings, because at this moment the distracter is outer in band.Local oscillator light needs after coming out plus a PC is to guarantee local oscillator light and signal light
Polarization state is consistent, maximum when observing by the amplitude of observation oscilloscope signal to guarantee to can be carried out normal coherent operations
When amplitude, PC at this time is fixed.
Signal light and local oscillator light are coupled together by OC, control and receive end optical power using a VOA.Due to me
The power that must assure that into of the PD that uses lower than 0dBm, therefore in experiment, it is necessary to the signal power that strict control is come in,
Avoid breakdown PD.The optical power that input can constantly be changed during the test carries out the test of the bit error rate, the test model of test
It encloses and arrives -12dBm for -6dBm, passed the optical fiber of 40km and the radio transmission of 2m, experimental result is as shown in Figure 5.Finally it can also pass through again
Cross a linear EA, amplified signal.
During radio transmission, K is propagated using a pairaThe antenna horn of wave band carries out signal transmission, each antenna
Loudspeaker have the gain of 25-dBi.In this experimental system, the bit error rate of different standoff distances between two loudspeaker is tested, it is real
It is as shown in Figure 6 to test result.But should be noted that whether alignment issues are very sensitive for position for two loudspeaker, so necessary
Constantly adjustment two loudspeaker relative position, and in communication process best no-sundries blocking, otherwise can make signal weaker, cause
The sharply decline of the bit error rate.
The collected data of oscillograph are subjected to offline DSP processing, specific flow chart is as shown in Figure 7.First according to FFT
Carry out rough estimate frequency deviation, frequency deviation is about 10MHz, signal is carried out down coversion according to this value, at symbolization phase average
The method of the single order carrier phase estimation of reason, can largely reduce the influence of interference.The algorithm that direct current is eliminated can disappear
Except the DC component of ultrahigh peak is received to optimize average symbol length in the estimation of first stage carrier phase using -7dBm
Optical power (ROP) receives the actual measurement bit error rate of signal with the change of average symbol length after 40km SMF and 2 m wireless transmission
Change as shown in Figure 8.Average length after optimization is selected as 501, while considering performance and delay.In next test,
The length of average symbol is fixed on 501.The method for using resampling and dispersion compensation again, using when resetting and based on the equal of CMA
Weighing apparatus method carrys out recovery of Q PSK symbol.Before calculating the bit error rate, phase of the second stage based on Viterbi-Viterbi is carried out
Estimation.
Claims (5)
1. a kind of optical fiber-wireless transmitting system for completing I/Q modulation based on both arms MZ Mach-Zehnder, mainly by optics
Baseband transmitter, base station, wireless receiving end, offline DSP handle 4 parts and form, and the system is shown in specific step is as follows:
First part, in the optics baseband transmitter stage, by the double-side band 20Gbit/s QPSK signal modulation generated on electricity to light
It is upper:
Step 1: the road I and the road Q of QPSK signal are generated with the digital analog converter (DAC) of 80Gsa/s, the length of signal is 8192,
Thereafter it is respectively connected to two linear electric amplifiers (EA), the amplitude and power of amplified signal again；
Step 2: the road I for passing through amplification and the road Q being respectively connected to the signal port of both arms MZ Mach-Zehnder, exocoel is opened and swashs
Light device (ECL-1) light passing, and the DC offset voltage of modulator is adjusted, reach half-wave voltage point；
Second part carries out beat frequency with local oscillator light and the signal light by 40km transmission, generates intermediate-freuqncy signal in the base station stage,
Finally carry out the wireless transmission of 5m:
Step 3: signal light passes through the transmission of 40km, is coupled with outside cavity gas laser (ECL-2) local oscillator light generated, local oscillator light
It is consistent with the polarization state of signal light to guarantee that addition Polarization Controller (PC) is needed before coupling；
Step 4: the intermediate-freuqncy signal after beat frequency controls its function for inputting photodetector (PD) by adjustable optical attenuator (VOA)
Rate guarantees in 0dBm hereinafter, avoiding breaking PD；
Step 5: signal is after photoelectric conversion, then accesses an EA and carry out electric signal amplification, finally accesses number of Ka wave band again
Angle antenna (HA) transmits signals to free space；
Part III is accepted at wireless receiving end and acquires signal:
Step 6: signal adjusts the position and direction of receiving end HA, collecting signal after the wireless transmission of 5m, and is connected to
The oscillograph of 80Gsa/S, data are collected, in case subsequent processing；
Part IV makes the bit error rate lower than before hard decision in offline DSP processing stage with many algorithms recovery of Q psk signal
To the thresholding 3.8 × 10 of error correction3:
Step 7: by the carry out DSP processing of the signal of acquisition, and the changeable parameter of constantly regulation experiment device, such as input PD
The distance etc. of preceding power, wireless transmission calculates the corresponding bit error rate, draws curve graph.And it can also basis when DSP is calculated
The considerations of performance and delay, constantly changes the tap length in direct current elimination algorithm, chooses suitable tap length.
2. the step 2 of first part according to claim 1 completes I/Q conversion with a both arms MZ Mach-Zehnder,
The expression formula of output are as follows:
When the value very little of I (t) and Q (t), ej*xPart can be unfolded with Taylor's formula:
What is be worth after IQ is converted is similar to the Taylor expansion of sin (x), the Taylor expansion of sin (x) are as follows:
It can be found that there are additional even power series in approximation, these grade several to bring serious nonlinear effect,
Therefore we need to limit our modulated signal to a very small extent.And when modulated signal very little, pass through both arms Mach
The signal of Zeng Deer modulator output may be expressed as:
1-j item in expression formula is exactly the DC influence item generated, is eliminated.
3. the step 2 of first part according to claim 1 need to be by both arms when the I/Q conversion that claim 2 to be realized is completed
The DC offset voltage of MZ Mach-Zehnder is modulated to half-wave voltage point, that is, when Maximum Power Output reduction 3dBm
Voltage value.
4. according to the step 3 of second part according to claim 1, local oscillator light and signal light need the frequency deviation of 28.8GHz or so,
When the frequency deviation is sufficiently large, so that it may so that the beat frequency distracter that DC component and signal light generate is located at outside band, to eliminate straight
Flow component bring influences.
5. the step 7 of Part IV according to claim 1, specific DSP process flow includes offset estimation, single order rank carrier wave phase
Position estimation, the elimination of DC component (DC), resampling, dispersion (DC) compensation, clock recovery, constant modulus algorithm equilibrium (CMA), second order
The calculating of phase estimation, the bit error rate.It is noted that the phase noise in experiment can bring narrowband to interfere, the interference is in equilibrium
It can not restrain in the process, therefore single order carrier phase estimation method need to be used, reduce its value as far as possible, then use direct current again
Null method eliminates it.So the elimination algorithm of DC component (DC) is a very crucial step in the present invention.
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| CN112311469A (en) * | 2019-07-30 | 2021-02-02 | 华为技术有限公司 | Microwave photon down converter and microwave receiving system based on DPMZM |
| CN114370992A (en) * | 2021-12-31 | 2022-04-19 | 中山大学 | Novel microcavity dispersion detection device |
| WO2022134136A1 (en) * | 2020-12-25 | 2022-06-30 | 北醒（北京）光子科技有限公司 | Frequency-modulated continuous-wave lidar system and lidar scanning method |
| CN116149086A (en) * | 2023-04-23 | 2023-05-23 | 中山大学 | Multi-order optical modulator and modulation method for on-chip optical matrix calculation |
| CN117375719A (en) * | 2023-10-20 | 2024-01-09 | 北京红山信息科技研究院有限公司 | Optical fiber and wireless fusion single-input multi-output communication system and method |
| WO2024007118A1 (en) * | 2022-07-04 | 2024-01-11 | 嘉兴倍创网络科技有限公司 | Terahertz communication method that improves transmission rate |
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