CN110190907A - A kind of I/Q signal phase error control method and system - Google Patents
A kind of I/Q signal phase error control method and system Download PDFInfo
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- CN110190907A CN110190907A CN201910687292.3A CN201910687292A CN110190907A CN 110190907 A CN110190907 A CN 110190907A CN 201910687292 A CN201910687292 A CN 201910687292A CN 110190907 A CN110190907 A CN 110190907A
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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
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6165—Estimation of the phase of the received optical signal, phase error estimation or phase error correction
Abstract
The invention discloses a kind of I/Q signal phase error control method and systems, it is related to relevant optical module technical field, method includes the following steps: realizing the control to I/Q signal phase error by the strength factor for adjusting channel corresponding to the road I signal and the road Q signal.The present invention is not necessarily to phase-shifter, and the orthogonal angle phase error of I/Q signal can be reduced or even eliminated in the case where not changing original coherent optical communication system framework, improves coherent optical communication system performance.
Description
Technical field
The present invention relates to relevant optical module technical fields, and in particular to a kind of I/Q signal phase error control method and is
System.
Background technique
It, can be substantially in order to carry out I, Q modulation and demodulation to signal using the phase information of light in coherent optical communication system
Improve coherent optical communication system capacity and distance.Coherent receiver can demodulate to obtain using Primary Components such as optical mixers
Mutually orthogonal I, Q signal.
However, since device is there are certain fabrication error, I, the Q signal demodulated is not during actual demodulation
It is perfect orthogonal, demodulation performance is reduced there are orthogonal angle phase error (referred to as phase error), deteriorating process performance, as light is believed
It makes an uproar than (OSNR).Also, traffic rate, encoder complexity are still further improving, and the phase of coherent receiver is integrated on piece
Position error, which proposes requirements at the higher level or even phase error, gradually becomes the key parameter of system for restricting performance.
In addition to technique correlation, phase error also has temperature dependency, wavelength dependence.In addition, different materials phase
Error is also different.Compared to PLC, the materials such as InP, soi chip refringence is larger, and phase error is usually bigger.Reduce silicon substrate
The phase error of opto chip is more difficult.
There are three types of the methods for reducing IQ phase error in coherent receiver at present: the first is optimization passive frequency mixer knot
Structure.The passive frequency mixer reported at present, such as based on the frequency mixer of 2x4MMI, after design optimization, theoretically, phase error
Can be less than 5 degree in operating wavelength range, ideally even less than 3 degree.However, this method is very sensitive to technique,
Between chip, all there is very big fabrication error between wafer.Therefore, in practice, product phase error is usually within a large range
Fluctuation, or even it is far longer than design value, cause product yield very low.
Second method needs directly to adjust the inside phase of frequency mixer by feeding back using active mixer structure.Such as
Three-dB coupler+phase-shifter structure frequency mixer adjusts phase inside frequency mixer by phase-shifter, can reduce IQ phase error.
However, the phase-shifter that this method introduces can bring additional cost, it such as can cause to export unbalanced, increase using PN junction phase-shifter
Insertion Loss.Hot crosstalk can then be introduced using thermoelectricity polar form phase-shifter, be easy to be interfered by temperature change.Meanwhile phase-shifter can also be additional
Increase power consumption, brings integrity problem.
The third method is compensated using DSP orthogonalization algorithm.This method is handled data stream in the side DSP, will be former
The none I/Q data of beginning is converted to the I/Q data of orthonomalization.However, in practical application, due to shadows such as noise, dispersions
The presence of the factor of sound, constrains algorithm compensation range.Meanwhile the algorithm introduces biggish calculated load, increases DSP power consumption, greatly
It is big reduce can application scenarios, as data center may not support the algorithm with DSP.In addition, still can not after algorithm compensation
Coherent optical communication system performance caused by phase error is eliminated to deteriorate.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of I/Q signal phase error controlling parties
Method, this method are not necessarily to phase-shifter, and IQ letter can be reduced or even eliminated in the case where not changing original coherent optical communication system framework
Number orthogonal angle phase error, improve coherent optical communication system performance.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of I/Q signal phase error control method, method includes the following steps:
By adjusting the strength factor in channel corresponding to the road I signal and the road Q signal, the control to I/Q signal phase error is realized
System.
Based on the above technical solution, pass through the intensity system in channel corresponding to the adjusting road I signal and the road Q signal
Number is realized the control to I/Q signal phase error, is specifically included:
Acquisition obtains the value of electrical signals vector of the road I signal and the road Q signal；
The functional value of target component is calculated, target component is using the value of electrical signals vector of the road I signal and the road Q signal as independent variable
Function, and target component is configured as: when the functional value of target component approaches most value, I/Q signal phase error approach is minimum
Value；
The strength factor for adjusting channel corresponding to the road I signal and the road Q signal approaches the functional value of target component and is most worth.
Based on the above technical solution, the expression formula of the target component are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th telecommunications of the road I signal in n times acquisition
Number value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
Based on the above technical solution, the expression formula of the target component may be:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th telecommunications of the road I signal in n times acquisition
Number value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
Based on the above technical solution, the strength factor for adjusting channel corresponding to the road I signal and the road Q signal, makes
The functional value approach of target component is most worth, and then I/Q signal phase error is made to approach minimum value, specifically includes.
S31. the initial strength coefficient for presetting each channel, according to the initial of the value of electrical signals vector of the road I signal and the road Q signal
Value, calculates the initial value of target componenty o 。
S32. 4 paths are divided into two groups to correspond to the road I signal and the road Q signal, and the phase of the two paths in every group
Potential difference is default degree, the boundary condition of the strength factor based on channel, by default alternately intensity system of the rule to two groups of channels
Number is adjusted, and when to wherein one group of channel is adjusted, using the channel first adjusted as reference channel, records the reference channel
Adjusting direction, when the reference channel is adjusted it is primary after, the strength factor in the channel adjusted after the group is persistently adjusted, is counted in real time
It calculatesE{|I|}WithE{|Q|}, until meeting, whereinAFor preset threshold value.
S33. satisfaction is utilizedWhen the n times I road signal of the corresponding acquisition and electricity of the road n times Q signal
Signal value calculates the correction value of target component, if correction value is greater than initial value, thens follow the steps S34, if correction value is less than initially
Valuey o , then follow the steps S35.
S34. return step S32, and change the adjusting direction of the strength factor of reference channel.
S35. return step S32, and keep the adjusting direction of the strength factor of reference channel constant.
S36. step S32 to S35 is repeated, the correction value of target component is approached and is most worth.
Based on the above technical solution, acquisition obtains the value of electrical signals vector of the road I signal and the road Q signal, specific to wrap
It includes:
Using the voltage value of the upper road I collected signal of each period in N number of period or the road Q signal as vector element, the road I is established
The voltage value vector of signal and the road Q signal；
Or, being established using the current value of the upper road I collected signal of each period in N number of period or the road Q signal as vector element
The current value vector of the road I signal and the road Q signal.
Based on the above technical solution, with the upper road I collected signal of each period in N number of period or the road Q signal
Voltage value as vector element, establish the voltage value vector of the road I signal and the road Q signal, specifically include:
The voltage value of the road an I signal is acquired on each period in N number of period, the voltage value of the road I signal meets:；
The voltage value of the road a Q signal is acquired on each period in N number of period, the voltage value of the road Q signal meets；
Wherein, R i (i=1~4)Indicate theiThe strength factor of paths,ωOptical frequency for signal light and local oscillator light is poor,Indicate thejPaths with respect to the 1st paths phase difference,R I WithR Q The respectively strength factor of I, Q,Indicate phase error；
Using the voltage value of N number of road I signal of acquisition as the value of N number of element of the voltage value vector of the road I signal；
Using the voltage value of N number of road Q signal of acquisition as the value of N number of element of the voltage value vector of the road Q signal.
Based on the above technical solution, pass through the optical power of adjusting optical mixer output light path, photodiode
The strength factor in channel is adjusted in PD responsiveness and/or trans-impedance amplifier TIA gain coefficient.
It is another object of the present invention to provide a kind of I/Q signal phase error control systems, are not necessarily to phase-shifter, energy
The orthogonal angle phase error of I/Q signal is reduced or even eliminated in the case where not changing original coherent optical communication system framework, is improved
Coherent optical communication system performance.
To achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of I/Q signal phase error control system, comprising:
Control unit is used for the strength factor by adjusting channel corresponding to the road I signal and the road Q signal, realizes and believes IQ
The control of number phase error.
Based on the above technical solution, described control unit includes:
Acquisition module is used to acquire the value of electrical signals vector for obtaining the road I signal and the road Q signal.
Computing module, is used to calculate the functional value of target component, and the target component is with the road I signal and the road Q signal
Value of electrical signals vector be independent variable function, and the target component is configured as: when target component functional value approach most
When value, I/Q signal phase error approaches minimum value；And.
Adjustment module is used to adjust the strength factor in channel corresponding to the road I signal and the road Q signal, makes target component
Functional value approach be most worth, and then make I/Q signal phase error approach minimum value.
Based on the above technical solution, the light function that the adjustment module passes through adjusting optical mixer output light path
The strength factor in channel is adjusted in rate, photodiode PD responsiveness and/or trans-impedance amplifier TIA gain coefficient.
Compared with the prior art, the advantages of the present invention are as follows:
The present invention defines target component by acquiring the electric current or voltage value of the road I signal and the road Q signal, to characterize phase
Error.The strength factor of 4 paths is individually adjusted, so that target component reaches minimum value or maximum value, and then is made pair
The phase error answered reaches minimum value, to realize the compensation to systematic phase error.And the method used in the present invention is not
The original hardware composition of change system, is not necessarily to phase-shifter, low in energy consumption, at low cost, can satisfy super 100G coherent optical communication system pair
The requirement of phase error.
Detailed description of the invention
Fig. 1 is the flow chart of I/Q signal phase error control method in the embodiment of the present invention.
Fig. 2 is the flow chart of step S3 in Fig. 1.
Fig. 3 is adjusted result schematic diagram in the embodiment of the present invention.
Fig. 4 is the schematic diagram of I/Q signal phase error control system in the embodiment of the present invention.
Fig. 5 is the schematic diagram of control unit in the embodiment of the present invention.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
The embodiment of the present invention provides a kind of I/Q signal phase error control method, method includes the following steps:
By adjusting the strength factor in channel corresponding to the road I signal and the road Q signal, the control to I/Q signal phase error is realized
System.
In the present embodiment, by way of adjusting the strength factor in channel corresponding to the road I signal and the road Q signal, to change
Become the value of electrical signals of the road I signal and the road Q signal, and then I/Q signal phase error can be influenced, to reach control I/Q signal phase
The purpose of position error.
Specifically, it is shown in Figure 1, by adjusting the strength factor in channel corresponding to the road I signal and the road Q signal,
It realizes the control to I/Q signal phase error, specifically includes:
S1. acquisition obtains the value of electrical signals vector of the road I signal and the road Q signal；
It is with the upper road I collected signal of each period in N number of period for the value of electrical signals vector of the road I signal and the road Q signal
Or the value of electrical signals of the road Q signal is usually established as element vector.The value of N wants moderate, needs to comprehensively consider accuracy and meter
Calculation amount.In the present embodiment, it can be 103、104Or 105, it is preferable that the value of N is 105。
Once completely acquisition can acquire 2N data in N number of period to the present embodiment, and complete acquisition can be another next time
Outer N number of period acquires 2N data.The electric signal of acquisition refers to the voltage or electric current that change with the time.
As a preferable embodiment, the present embodiment is at the respective determination point of each period in N number of period, respectively
Acquire the value of electrical signals of the road an I signal and the road a Q signal.For determination point for eye figure, eye figure is with twilight sunset side
Formula accumulate the bit of the collected serial signal of Overlapping display as a result, when signal-to-noise ratio reaches optimum value, the opening of eye figure
Reach maximum, is the Best Times of sampling at this time, is also determination point.
It is collection voltages or electric current that the present embodiment, which can according to need selection:
When collection voltages, establish the voltage value vector of the road I signal and the road Q signal, the voltage value of the road I signal or the road Q signal to
The value of N number of element in amount are as follows: the voltage value of the road I collected signal or the road Q signal on each period in N number of period.
When acquiring electric current, the current value vector of the road I signal and the road Q signal, the electric current of the road I signal or the road Q signal are established
It is worth the value of N number of element in vector are as follows: the electric current of the road I collected signal or the road Q signal on each period in N number of period
Value.
It is specifically introduced by taking voltage as an example below:
Optical mixer in the present embodiment is 90 degree of optical mixers, and output is 4 tunnels.To determine the quantity in channel
It is 4, while also determines the phase difference between channel.
The voltage value of the road an I signal is acquired on each period in N number of period, the voltage value of the road I signal meets:；
The voltage value of the road a Q signal is acquired on each period in N number of period, the voltage value of the road Q signal meets；
Wherein, R i (i=1~4)Indicate theiThe strength factor of paths,ωOptical frequency for signal light and local oscillator light is poor,Indicate thejPaths with respect to the 1st paths phase difference,R I WithR Q The respectively strength factor of I, Q,Indicate phase error；AndR I 、R Q 、△θ I With△θ Q Meet:
Using the voltage value of N number of road I signal of acquisition as the value of N number of element of the voltage value vector of the road I signal；
Using the voltage value of N number of road Q signal of acquisition as the value of N number of element of the voltage value vector of the road Q signal.
Similarly, it is similar with voltage if desired to acquire electric current, numerically, difference has been resistance or impedance more.
In the foregoing description, the strength factor in channel mainly reflects strength information, in other words amplitude size.
On physical layer, theiPaths are practical including but not limited to the of optical mixeriRoad output light path, theiRoad
Photodiode PD, theiThe trans-impedance amplifier TIA on road.
Therefore, the strength factor in channel is at least related to following factor: theiThe optical power of pathsP i , theiThe sound of road PD
ResponseRE i , the gain coefficient of the i-th road TIAA i .TheiThe strength factor on road can approximation meet following relationship:。
So as to by adjust the optical power of optical mixer output light path, photodiode PD responsiveness and/or across
Impedance amplifier TIA gain coefficient is adjusted the strength factor in channel.
I, the strength factor of Q refers mainly to the amplitude of the electric signal of the road I signal and the road Q signal, is voltage if collection voltages
Amplitude, if acquisition electric current, for the amplitude of electric current.
S2. the functional value of target component is calculated, target component is to be with the value of electrical signals vector of the road I signal and the road Q signal
The function of independent variable, and target component is configured as: when the functional value of target component approaches most value, I/Q signal phase error becomes
Nearly minimum value；
Goal parameter can be rationally arranged according to actual needs, need the condition met are as follows: when target component becomes
When being closely most worth, I/Q signal phase error approaches minimum value.That is only need to meet: when target component approach maximum value or
When minimum value, I/Q signal phase error can be made to approach minimum value.
The expression formula of target component in the present embodiment are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th telecommunications of the road I signal in n times acquisition
Number value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
Using the target component in the present embodiment expression formula when, the condition met is: when target component approach it is minimum
When value, I/Q signal phase error approaches minimum value.
Another target component is given below, when meeting target component approach maximum value, I/Q signal phase error is approached most
Small value.
That is the expression formula of target component are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th telecommunications of the road I signal in n times acquisition
Number value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
S3. the strength factor for adjusting channel corresponding to the road I signal and the road Q signal, approaches the functional value of target component
Most it is worth, and then I/Q signal phase error is made to approach minimum value.
Shown in Figure 2, step S3 specifically includes following steps.
S31. the initial strength coefficient for presetting each channel, according to the initial of the value of electrical signals vector of the road I signal and the road Q signal
Value, calculates the initial value of target componenty o 。
S32. 4 paths are divided into two groups to correspond to the road I signal and the road Q signal, and the phase of the two paths in every group
Potential difference is default degree, the boundary condition of the strength factor based on channel, by default alternately intensity system of the rule to two groups of channels
Number is adjusted, and when to wherein one group of channel is adjusted, using the channel first adjusted as reference channel, records the reference channel
Adjusting direction, when the reference channel is adjusted it is primary after, the strength factor in the channel adjusted after the group is persistently adjusted, is counted in real time
It calculatesE{|I|}WithE{|Q|}, until meeting, wherein for preset threshold value.
Optical mixer in the present embodiment is 90 degree of optical mixers, and output is 4 tunnels.To determine the number in channel
Amount is also 4, while also determining the phase difference between channel.Therefore it needs that initial strength coefficient is respectively set to 4 paths.So
The value of electrical signals of the road the I signal and the road Q signal that are acquired afterwards using within certain N number of period is calculated as initial value, obtains target ginseng
Several initial valuesy o 。
4 paths are divided into two groups to correspond to the road I signal and the road Q signal, the grouping condition to be met is in every group
The phase difference of two paths is default degree, and usually the ideal value of this default degree is 180 degree.
In the present embodiment, adjustable optical attenuator (VOA) can be used or semiconductor optical amplifier (SOA) adjusts optics and mixes
Frequency device Output optical power, or the modes such as TIA gain coefficient are adjusted to realize the adjusting to the strength factor in channel.Channel it is strong
The boundary condition of degree coefficient refers to the adjustable range of the strength factor in channel, for example is arranged in [x1, x2] this range adjusted
Section.Default alternately rule refers to: according to first adjusting one group of channel P time, then adjust another group of channel Q time mode conduct it is primary
Two groups of channels are adjusted in circulation, repetition.If being 1 than P and Q, then be two groups of channels successively alternately, if P and Q are equal
It is 10, then first continuously one group of channel is adjusted 10 times, then another group of channel is continuously adjusted 10 times, and follows in this manner
Ring.
SettingThis condition is to judgeE{|I|}Whether it is equal toE{|Q|}, usually come
It says when the difference between the two meets in preset threshold range, i.e., it is believed that the two is equal.When the two is equal, can be very good to protect
Demonstrate,prove the quality of signal.
For the adjusting direction of reference channel, adjusts direction and refer to that the strength factor of reference channel is increased or subtracted
It is small, it refers to that selection at the beginning increases the strength factor of reference channel if changing and adjusting direction, is reduced by when adjusting next time
The strength factor of the reference channel.
In practical adjustments, regulated quantity, namely adjust step-lengthδR, every adjusting is primary to increase or decrease an adjusting step
It is longδR。δRIt can be fixed value, adaptive algorithm can also be designed, i.e., with this step-length of the deep change of adjusting.This step
Long relevant algorithm is also conventional algorithm.
S33. satisfaction is utilizedWhen the n times I road signal of the corresponding acquisition and electricity of the road n times Q signal
Signal value calculates the correction value of target component, if correction value is greater than initial valuey o , S34 is thened follow the steps, if correction value is less than just
Initial valuey o , then follow the steps S35.
S34. return step S32, and change the adjusting direction of the strength factor of reference channel.
S35. return step S32, and keep the adjusting direction of the strength factor of reference channel constant.
S36. step S32 to S35 is repeated, the correction value of target component is approached and is most worth, and then make I/Q signal phase error
Approach minimum value.
It can be seen from the above, by needing to meet in this present embodiment: when target component approaches minimum value, I/Q signal phase is missed
Difference approach minimum value.If therefore correction value is greater than initial valuey o , show that the value of target component becomes larger, need to change the tune of reference channel
Direction is saved, if correction value is less than initial valuey o , then show that the adjusting of reference channel is in the right direction, keep this to adjust direction and continue
It adjusts, target component is made gradually to approach minimum value, and then I/Q signal phase error is made to approach minimum value.
Based on the target component that embodiment provides, obtaining adjusted result such as Fig. 3 by emulation (includes (a) and (b) two
Point).Simulated conditions ignore sampling error, ignore signal noise etc., using random value as signal code stream, phase error before compensating
For 20 degree (at this point,R 1= R 2= R 3= R 4 ).In emulation, the adjusting on the road I and the road Q uses alternate mode.The road I, the road Q carry out primary
After adjusting, then it is assumed that complete an iteration.
In Fig. 3 abscissa be the number of iterations, in (a) ordinate be adjusting strength compensating coefficient after phase error, (b) in
The value that ordinate is target component y after iteration each time.It can be seen that phase error is mended after by adjusting strength coefficient
It repays.
In conclusion electric current or voltage value of the present invention by the acquisition road I signal and the road Q signal, and define target ginseng
Number, to characterize phase error.The strength factor of 4 paths is individually adjusted, so that target component reaches minimum value or most
Big value, and then corresponding phase error is made to reach minimum value, to realize the compensation to systematic phase error.And in the present invention
The method of use does not change the original hardware composition of system, is not necessarily to phase-shifter, low in energy consumption, at low cost, and it is relevant to can satisfy super 100G
Requirement of the optical communication system to phase error.
Shown in Figure 4, the embodiment of the present invention also provides a kind of I/Q signal phase error control system, comprising: optics is mixed
Frequency device, the road I photodetector, the road Q photodetector and control unit.It is shown in Figure 5, control unit include acquisition module,
Computing module and adjustment module.
Wherein, optical mixer is used to export after received signal light and local oscillator photomixing；
The road I photodetector, input terminal are connected with the output end of the optical mixer；
The road Q photodetector, input terminal are connected with the output end of the optical mixer；
Acquisition module, input terminal is connected with the output end of the road I photodetector and the road Q photodetector respectively, described
Acquisition module is used to acquire the value of electrical signals vector for obtaining the road I signal and the road Q signal.
Electric signal refers to the voltage or electric current changed with the time, and it is acquisition electricity that the present embodiment, which can according to need selection,
Pressure or electric current.
When collection voltages, acquisition module on each period in N number of period for acquiring the road I signal and the road Q signal
Voltage value, the value of N number of element as the voltage value vector for establishing the road I signal and the road Q signal.
When acquiring electric current, acquisition module on each period in N number of period for acquiring the road I signal and the road Q signal
Current value, the value of N number of element as the current value vector for establishing the road I signal and the road Q signal.
It is specifically introduced by taking acquisition module collection voltages as an example below:
Optical mixer in the present embodiment is 90 degree of optical mixers, and output is 4 tunnels.To determine the quantity in channel
It is 4, while also determines the phase difference between channel.
The voltage value of the road an I signal is acquired on each period in N number of period, the voltage value of the road I signal meets:；
The voltage value of the road a Q signal is acquired on each period in N number of period, the voltage value of the road Q signal meets；
Wherein,R i (i=1~4)Indicate theiThe strength factor of paths,ωOptical frequency for signal light and local oscillator light is poor,Indicate thejPaths with respect to the 1st paths phase difference,R I WithR Q The respectively strength factor of I, Q,Indicate phase error；AndR I 、R Q 、△θ I With△θ Q Meet:
Using the voltage value of N number of road I signal of acquisition as the value of N number of element of the voltage value vector of the road I signal；
Using the voltage value of N number of road Q signal of acquisition as the value of N number of element of the voltage value vector of the road Q signal.
In the present embodiment, control unit can be DSP(Digital Signal Processing, at digital signal
Reason) chip.The road I photodetector and the road Q photodetector include photodiode PD or I road photodetector and the road Q light
Electric explorer includes photodiode PD and trans-impedance amplifier TIA.Photodiode PD is for converting optical signals to electric current
Signal, trans-impedance amplifier TIA are used to the current signal of photodiode PD being converted to voltage signal.Pass through above two realization
Mode can determine acquisition current value or voltage value.
Further, the present embodiment acquires the road an I letter at the respective determination point of each period in N number of period respectively
Number and the road a Q signal value of electrical signals.For determination point for eye figure, eye figure is to accumulate Overlapping display with twilight sunset mode
The bit of collected serial signal as a result, when signal-to-noise ratio reaches optimum value, the opening of eye figure reaches maximum, is at this time
The Best Times of sampling, are also determination point.Determination point calculates determination by control unit, such as the general-purpose algorithm of dsp chip.
Computing module, is used to calculate the functional value of target component, and the target component is with the road I signal and the road Q signal
Value of electrical signals vector be independent variable function, and the target component is configured as: when target component approaches most value, IQ believes
Number phase error approaches minimum value.
As a preferable embodiment, the expression formula of the target component are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th telecommunications of the road I signal in n times acquisition
Number value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
Another target component is given below, when meeting target component approach maximum value, I/Q signal phase error is approached most
Small value.
That is the expression formula of target component are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th telecommunications of the road I signal in n times acquisition
Number value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
Adjustment module is used to adjust the strength factor in channel corresponding to the road I signal and the road Q signal, makes target component
Functional value approach be most worth, and then make I/Q signal phase error approach minimum value.
Preferably, optical power, photodiode PD responsiveness that adjustment module passes through adjusting optical mixer output light path
And/or trans-impedance amplifier TIA gain coefficient is adjusted the strength factor in channel.
As a preferable embodiment, channel corresponding to the road I signal and the road Q signal is adjusted using adjustment module
Strength factor is worth target component approach most, and then I/Q signal phase error is made to approach minimum value, and detailed process includes.
S31. the initial strength coefficient for presetting each channel, according to the road I signal and the road Q signal initial electrical signal value vector, meter
Calculate the initial value of target componenty o 。
S32. 4 paths are divided into two groups to correspond to the road I signal and the road Q signal, and the phase of the two paths in every group
Potential difference is default degree, the boundary condition of the strength factor based on channel, by default alternately intensity system of the rule to two groups of channels
Number is adjusted, and when to wherein one group of channel is adjusted, using the channel first adjusted as reference channel, records the reference channel
Adjusting direction, when the reference channel is adjusted it is primary after, the strength factor in the channel adjusted after the group is persistently adjusted, is counted in real time
It calculatesE{|I|}WithE{|Q|}, until meeting, whereinAFor preset threshold value.
Default alternately rule refers to: according to first adjusting one group of channel P times, then adjusting the mode in another group of channel Q times and makees
For one cycle, two groups of channels are adjusted in repetition.Referring to shown in figure, 4 paths can be divided into two groups, first group includes
Channel 1 and channel 2, second group includes channel 3 and channel 4.First group and second group of adjusting sequence can be interchanged, in first group
Channel 1 and the adjusting sequence in channel 2 can be interchanged, the adjusting in channel 3 and channel 4 in second group sequence also can be interchanged.
If being 1 than P and Q, then be first group and second group successively alternately, if P and Q are 10, can be
First continuously to first group adjusting 10 times, then second group is continuously adjusted 10 times, and recycles in this manner.
S33. satisfaction is utilizedWhen the n times I road signal of the corresponding acquisition and electricity of the road n times Q signal
Signal value calculates the correction value of target component, if correction value is greater than initial valuey o , S34 is thened follow the steps, if correction value is less than just
Initial valuey o , then follow the steps S35.
S34. return step S32, and change the adjusting direction of the strength factor of reference channel.
S35. return step S32, and keep the adjusting direction of the strength factor of reference channel constant.
S36. step S32 to S35 is repeated, the correction value of target component is approached and is most worth, and then make I/Q signal phase error
Approach minimum value.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (10)
1. a kind of I/Q signal phase error control method, which is characterized in that method includes the following steps:
Acquisition obtains the value of electrical signals vector of the road I signal and the road Q signal；
The functional value of target component is calculated, target component is using the value of electrical signals vector of the road I signal and the road Q signal as independent variable
Function, and target component is configured as: when the functional value of target component approaches most value, I/Q signal phase error approach is minimum
Value；
The strength factor for adjusting channel corresponding to the road I signal and the road Q signal approaches the functional value of target component and is most worth.
2. a kind of I/Q signal phase error control method as described in claim 1, which is characterized in that the table of the target component
Up to formula are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th electric signal of the road I signal in n times acquisition
Value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
3. a kind of I/Q signal phase error control method as described in claim 1, which is characterized in that the table of the target component
Up to formula are as follows:
IWithQThe respectively value of electrical signals vector of the road I signal and the road Q signal,I N For the n-th electric signal of the road I signal in n times acquisition
Value,Q N For the n-th value of electrical signals of the road Q signal in n times acquisition, N is positive integer.
4. a kind of I/Q signal phase error control method as claimed in claim 2 or claim 3, which is characterized in that adjust the road I signal and
The strength factor in channel corresponding to the signal of the road Q approaches the functional value of target component and is most worth, and then makes I/Q signal phase error
Minimum value is approached, is specifically included:
S31. the initial strength coefficient for presetting each channel, according to the initial value of the road I signal and the value of electrical signals vector of the road Q signal,
Calculate the initial value of target componenty o ；
S32. 4 paths are divided into two groups to correspond to the road I signal and the road Q signal, and the phase difference of the two paths in every group
To preset degree, the boundary condition of the strength factor based on channel, by default alternately rule to the strength factor in two groups of channels into
Row is adjusted, and when to wherein one group of channel is adjusted, using the channel first adjusted as reference channel, records the tune of the reference channel
Direction is saved, after the reference channel is adjusted once, the strength factor in the channel adjusted after the group is persistently adjusted, is calculated in real timeE {|I|}WithE{|Q|}, until meeting, whereinAFor preset threshold value；
S33. satisfaction is utilizedWhen the n times I road signal of the corresponding acquisition and telecommunications of the road n times Q signal
Number value, calculate the correction value of target component, if correction value be greater than initial valuey o , S34 is thened follow the steps, if correction value is less than initially
Valuey o , then follow the steps S35；
S34. return step S32, and change the adjusting direction of the strength factor of reference channel；
S35. return step S32, and keep the adjusting direction of the strength factor of reference channel constant；
S36. step S32 to S35 is repeated, the correction value of target component is approached and is most worth.
5. a kind of I/Q signal phase error control method as claimed in claim 4, which is characterized in that acquisition obtains the road I signal
With the value of electrical signals vector of the road Q signal, specifically include:
Using the voltage value of the upper road I collected signal of each period in N number of period or the road Q signal as vector element, the road I is established
The voltage value vector of signal and the road Q signal；
Or, being established using the current value of the upper road I collected signal of each period in N number of period or the road Q signal as vector element
The current value vector of the road I signal and the road Q signal.
6. a kind of I/Q signal phase error control method as claimed in claim 5, which is characterized in that each with N number of period
The voltage value of the road I collected signal or the road Q signal establishes the voltage of the road I signal and the road Q signal as vector element on period
It is worth vector, specifically includes:
The voltage value of the road an I signal is acquired on each period in N number of period, the voltage value of the road I signal meets:；
The voltage value of the road a Q signal is acquired on each period in N number of period, the voltage value of the road Q signal meets；
Wherein,R i (i=1 ~ 4) indicate theiThe strength factor of paths,ωOptical frequency for signal light and local oscillator light is poor,Indicate thejPaths with respect to the 1st paths phase difference,R I WithR Q The respectively strength factor of I, Q,Indicate phase error；
Using the voltage value of N number of road I signal of acquisition as the value of N number of element of the voltage value vector of the road I signal；
Using the voltage value of N number of road Q signal of acquisition as the value of N number of element of the voltage value vector of the road Q signal.
7. a kind of I/Q signal phase error control method as described in claim 1, it is characterised in that: by adjusting optical frequency mixing
Optical power, photodiode PD responsiveness and/or the trans-impedance amplifier TIA gain coefficient of device output light path carry out the intensity to channel
Coefficient is adjusted.
8. a kind of I/Q signal phase error control system characterized by comprising
Control unit is used for the strength factor by adjusting channel corresponding to the road I signal and the road Q signal, realizes and believes IQ
The control of number phase error.
9. a kind of I/Q signal phase error control system as claimed in claim 8, which is characterized in that described control unit packet
It includes:
Acquisition module is used to acquire the value of electrical signals vector for obtaining the road I signal and the road Q signal；
Computing module, is used to calculate the functional value of target component, and the target component is with the electricity of the road I signal and the road Q signal
Signal value vector is the function of independent variable, and the target component is configured as: when the functional value of target component approaches most value,
I/Q signal phase error approaches minimum value；And
Adjustment module is used to adjust the strength factor in channel corresponding to the road I signal and the road Q signal, makes the letter of target component
Numerical value approach is most worth, and then I/Q signal phase error is made to approach minimum value.
10. a kind of I/Q signal phase error control system as claimed in claim 9, which is characterized in that the adjustment module is logical
Overregulate the optical power, photodiode PD responsiveness and/or trans-impedance amplifier TIA gain coefficient of optical mixer output light path
The strength factor in channel to be adjusted.
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| PCT/CN2019/126870 WO2021017382A1 (en) | 2019-07-29 | 2019-12-20 | Method and system for controlling iq signal phase error |
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