CN107395289A - One kind is used to compensate the unbalanced method of multiple-channel output coherent receiver output intensity - Google Patents
One kind is used to compensate the unbalanced method of multiple-channel output coherent receiver output intensity Download PDFInfo
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- CN107395289A CN107395289A CN201710656039.2A CN201710656039A CN107395289A CN 107395289 A CN107395289 A CN 107395289A CN 201710656039 A CN201710656039 A CN 201710656039A CN 107395289 A CN107395289 A CN 107395289A
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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
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
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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
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Abstract
It is used to compensate the unbalanced method of multiple-channel output coherent receiver output intensity the present invention relates to one kind, comprises the following steps：1) signal of special characteristic is inputted into multiple-channel output coherent receiver；2) parallel acquisition multiple-channel output coherent receiver is per output signal all the way, a length of T during collection；3) each road output collected is averaged, and the direct current biasing of signal is characterized with the value；4) direct current biasing of time T Nei Ge roads output is excluded；5) standard deviation of time T Nei Ge roads output is calculated, and the AC-amplitudes of signal are characterized with the value；6) AC-amplitudes of unified time T Nei Ge roads output.Requirement of the present invention for input signal feature is loose, it is applicable for different types of multiple-channel output coherent receiver, and real-time is high, system architecture and digital signal processing method that need not be complicated, the direct current biasing and AC-amplitudes of multiple-channel output coherent receiver output can be corrected and compensated in real time, ensures the uniformity of direct current biasing and AC-amplitudes.
Description
Technical field
The present invention relates to signal processing method, belongs to signal processing technology field, it is more particularly related to a kind of
For compensating the unbalanced method of multiple-channel output coherent receiver output intensity.
Background technology
Multiple-channel output coherent receiver has great applying value in communication, sensing and field of radar.It utilizes this
The light that shakes provides gain for flashlight, and its per two-way between fixed phase difference and polarization diversity reception technique with for
Intensity, phase and the polarization state of demodulated signal provide possibility simultaneously.Multiple-channel output coherent receiver has numerous species, such as transports
The polarization diversity type formed with 90 ° of optical mixers and balanced detector in the same direction/orthogonal signalling demodulating system (I/Q demodulation system
System), the phase demodulating system being mixed with 2 × 2 couplers or 3 × 3 couplers, and phase generated carrier demodulation system
System.
But due to inevitable hardware deficiency, multiple-channel output coherent receiver in practice per defeated all the way
Imbalance, i.e. mismatch problems may be present by going out.It is embodied in the intensity imbalance of every two-way output signal and phase not
Balance.Wherein, intensity imbalance can cause the signal to noise ratio of output signal to decline, and can influence to demodulate the envelope shape of signal.
Meanwhile the hardware parameter of receiver can occur slowly to change over time.Therefore, for the letter of multiple-channel output coherent receiver
It is necessary that number intensity, which carries out real-Time Compensation,.
The content of the invention
Based on above technical problem, it is used to compensate multiple-channel output coherent receiver output intensity not the invention provides one kind
The method of balance, so as to solve, the direct current biasing and AC-amplitudes of conventional multiple-channel output coherent receiver output are inconsistent, lose
The technical problem matched somebody with somebody.
To solve above technical problem, the technical solution adopted by the present invention is as follows：
One kind is used to compensate the unbalanced method of multiple-channel output coherent receiver output intensity, and this method includes following step
Suddenly：
1) multiple-channel output coherent receiver is input a signal into；
2) parallel acquisition multiple-channel output coherent receiver is per output signal all the way, a length of T during collection；
3) each road output collected is averaged, and the direct current biasing of signal is characterized with the value；
4) direct current biasing of time T Nei Ge roads output is excluded；
5) standard deviation of time T Nei Ge roads output is calculated, and the AC-amplitudes of signal are characterized with the value；
6) AC-amplitudes of unified time T Nei Ge roads output.
In the step 1), the signal of input meets claimed below：The signal is by periodically moving processing, at [0,2 π]
Upper obedience is uniformly distributed.
In the step 2), duration T scope meets claimed below：Signal within the time is by periodically moving place
Obey and be uniformly distributed on [0,2 π] after reason.
In the step 4), direct current biasing excludes by the following method：Subtracted correspondingly by each road output collected
Average value.
In the step 6), the output of each road divided by corresponding standard deviation, obtained result by sampling are AC-amplitudes
Unified signal.
In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows：The present invention is for input signal
The requirement of feature is loose, is applicable for different types of multiple-channel output coherent receiver, and real-time is high, it is not necessary to complicated
System architecture and digital signal processing method, can correct and compensate in real time multiple-channel output coherent receiver output direct current biasing and
AC-amplitudes, ensure the uniformity of direct current biasing and AC-amplitudes.
Brief description of the drawings
Fig. 1 is the system schematic that the present invention carries out signal compensation using multiple-channel output coherent receiver；
Fig. 2 is the experimental system sketch using multiple-channel output coherent receiver application example；
Embodiment
The present invention is further illustrated below in conjunction with the accompanying drawings.Embodiments of the present invention include but is not limited to following reality
Apply example.
One kind is used to compensate the unbalanced method of multiple-channel output coherent receiver output intensity, and this method includes following step
Suddenly：
1) multiple-channel output coherent receiver is input a signal into；
2) parallel acquisition multiple-channel output coherent receiver is per output signal all the way, a length of T during collection；
3) each road output collected is averaged, and the direct current biasing of signal is characterized with the value；
4) direct current biasing of time T Nei Ge roads output is excluded；
5) standard deviation of time T Nei Ge roads output is calculated, and the AC-amplitudes of signal are characterized with the value；
6) AC-amplitudes of unified time T Nei Ge roads output.
Requirement of the present embodiment method for input signal feature is loose, such as the Rayleigh scattering light of pulsed light in a fiber
Just meet the requirements；This method is applicable for different types of multiple-channel output coherent receiver, such as in coherent receiver
Mixing unit can compensate in aforementioned manners for the system of 90 ° of optical mixers and 3 × 3 couplers；The reality of this method
Shi Xinggao, and do not need complicated system architecture and digital signal processing method.Pass through above method, you can amendment and compensation are more
Each road output direct current biasing of road output coherent receiver and AC-amplitudes, ensure output signal strength, phase equilibrium.
The AC-amplitudes of the present embodiment unified time T Nei Ge roads output, you can eliminate output channel AC response coefficient not
Consistent influence.
Based on above example, in the step 1), the signal of input meets claimed below：The signal is by periodically removing
Shifting is handled, and is obeyed and is uniformly distributed on [0,2 π], and T value is as far as possible small.
Based on above example, in the step 2), duration T scope meets claimed below：Signal within the time
Obey and be uniformly distributed on [0,2 π] after periodically moving processing.
Based on above example, in the step 4), direct current biasing excludes by the following method：It is each by what is collected
Road output subtracts corresponding average value.
Based on above example, in the step 6), the output of each road divided by corresponding standard deviation by sampling, obtained knot
Fruit is the unified signal of AC-amplitudes.
For the complete present invention, the present invention is done in detail below with specific embodiment and combination concrete structure, data and step
Describe in detail bright.
Specific embodiment
Fig. 1 is the system schematic that signal compensation is carried out using multiple-channel output coherent receiver；
Fig. 2 is the experimental system sketch using multiple-channel output coherent receiver application example；
As shown in Figure 1, multiple-channel output coherent receiver is made up of mixing unit and detector, and this kind of receiver can be realized
The mixing of flashlight and local oscillator light, and all demodulated for the output of every road plus a stationary phase for signal phase.Multichannel is defeated
The SLM Signal Label Mismatch for going out every road output of coherent receiver may result in the Signal-to-Noise reduction demodulated, so that losing
Very, therefore using following methods signal compensation is carried out.
If the output channel number of multiple-channel output coherent receiver is N.Ideally, the direct current of coherent receiver output
Component is completely removed, completely the same per AC compounent intensity all the way, is appointed and is taken multiple-channel output coherent receiver wherein 2 roads to believe
Number, in the ideal case, output signal is shown below：
In above formula (1), Ix and Iy represents the output signal on xth Lu Yu y roads, x≤N, y≤N, x ≠ y respectively；A, which is represented, to be handed over
Flow the amplitude of signal；Represent the signal phase changed over time；θ is represented due to stationary phase caused by mixing unit
Difference.
Due to hardware it is inevitable the defects of, the DC component of signal may be completely removed, meanwhile, any 2 tunnel
The energy of signal communication component mismatch may occur, in the case, the output signal on any 2 tunnel is shown below：
In above formula (2), ix and iy represent respectively intensity mismatch multiple-channel output coherent receiver xth road and y roads it is defeated
Go out signal, Dx and Dy represents the direct current signal of xth Lu Yu y roads residual respectively；Ax and Ay represents xth Lu Yu y roads respectively
The amplitude of AC signal.
The phase for sampling output signal in duration T is proceeded through and periodically moved, that is, after normalizing, on [0,2 π]
Obedience is uniformly distributed, and according to the output signal of formula (2), the statistical law on xth Lu Yu y roads can be represented by following formula (3)：
In above formula (3), Ex and Ey represents the average value of xth Lu Yu y roads output signal respectively；WithIs represented respectively
The variance of x roads and y roads output signal, then δxWith δyX roads and the standard deviation of y roads output signal are represented respectively.Can by formula (3)
Know, in the case of sampling duration is sufficiently long, the DC component of signal can be represented by the average value of signal；The exchange of signal point
The amplitude of amount can be represented that therefore, the signal intensity for compensating multiple-channel output coherent receiver is unbalanced by the standard deviation of signal
Method can be represented by following formula (4)：
In sampling duration long enough it can be seen from formula (4), the phase of input signal is obeyed on [0,2 π] to be uniformly distributed
In the case of, first subtraction signal average can be used, then divided by signal standards difference method real-Time Compensation multiple-channel output phase stem grafting
The intensity of receipts machine is uneven.
In order to realize real-Time Compensation, sampling duration is substantially obeyed uniform after normalization in the phase for meeting demodulated signal
On the premise of distribution, minimum value is taken.
Requirement of the method for the present embodiment for input signal feature is loose, in the phase-sensitive optical time domain shown in Fig. 2
In reflectometer, laser caused by narrow linewidth laser passes through 1：99 couplers, 1% light as local oscillator light, 99% laser by
Light modulator modulates pass through circulator into pulsed light, pulsed light, into test optical fiber, in light in transmitting procedure caused by after
Pass through circulator again to Rayleigh scattering light, as flashlight.Pulsed light transmit in a fiber caused by Rayleigh scattering light due to
Randomness spatially, so the probability distribution of scattering light phase meets to be uniformly distributed at [0,2 π].It is 100 to take time T
It pulse period, both can guarantee that sampled point was enough, and met the Probability Distribution of sample close to probability distribution, and can ensures T to observation
Person is short enough, ensures real-time, the data of the scattering light in time T are averaged as direct current biasing, ask standard deviation conduct
AC-amplitudes.
The method of the present embodiment is applicable for different types of multiple-channel output coherent receiver, such as coherent reception
Mixing unit can compensate in aforementioned manners for the system of 90 ° of optical mixers and 3 × 3 couplers in machine；This method
Real-time it is high, and need not be complicated system architecture and digital signal processing method.
It is embodiments of the invention as described above.Each preferred embodiment described previously for the present invention, it is each preferred
Preferred embodiment in embodiment if not obvious contradictory or premised on a certain preferred embodiment, it is each preferably
Embodiment arbitrarily stack combinations can use, and the design parameter in the embodiment and embodiment is merely to understand table
The invention verification process of inventor is stated, and is not used to the scope of patent protection of the limitation present invention, scope of patent protection of the invention
Still it is defined by its claims, the equivalent structure change that every specification and accompanying drawing content with the present invention is made, together
Reason should be included within the scope of the present invention.
Claims (5)
1. one kind is used to compensate the unbalanced method of multiple-channel output coherent receiver output intensity, it is characterised in that this method bag
Include following steps：
1) signal of special characteristic is inputted into multiple-channel output coherent receiver；
2) parallel acquisition multiple-channel output coherent receiver is per output signal all the way, a length of T during collection；
3) each road output collected is averaged, and the direct current biasing of signal is characterized with the value；
4) direct current biasing of time T Nei Ge roads output is excluded；
5) standard deviation of time T Nei Ge roads output is calculated, and the AC-amplitudes of signal are characterized with the value；
6) AC-amplitudes of unified time T Nei Ge roads output.
2. according to the method for claim 1, it is characterised in that in the step 1), the signal satisfaction of special characteristic is following
It is required that：The signal is obeyed on [0,2 π] and is uniformly distributed by periodically moving processing.
3. according to the method for claim 1, it is characterised in that in the step 2), duration T scope meets following want
Ask：Signal within the time is obeyed after periodically moving processing on [0,2 π] to be uniformly distributed.
4. according to the method for claim 1, it is characterised in that in the step 4), the direct current biasing is by gathering
To each road output subtract corresponding to be averagely worth to.
5. according to the method for claim 1, it is characterised in that in the step 6), by each road of sampling output divided by right
The standard deviation answered, obtained result are the unified signal of AC-amplitudes.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109710172A (en) * | 2019-01-11 | 2019-05-03 | 北京无线电测量研究所 | The method for parameter configuration of multi-channel high-speed modulus conversion chip, device and system |
| CN113483790A (en) * | 2021-06-18 | 2021-10-08 | 安徽龙联智能光电有限公司 | Distributed acoustic sensing phase demodulation method and system |
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| CN86100077A (en) * | 1985-03-07 | 1986-11-05 | 国际标准电气公司 | Balanced coherent is received device |
| CN101398485A (en) * | 2007-09-26 | 2009-04-01 | 中国科学院电子学研究所 | Antisaturation quantization encoding and decoding method for spaceborne SAR raw data |
| CN101453435A (en) * | 2007-12-04 | 2009-06-10 | 中兴通讯股份有限公司 | Method and apparatus for DC offset correction in zero intermediate frequency receiver |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109710172A (en) * | 2019-01-11 | 2019-05-03 | 北京无线电测量研究所 | The method for parameter configuration of multi-channel high-speed modulus conversion chip, device and system |
| CN109710172B (en) * | 2019-01-11 | 2022-03-25 | 北京无线电测量研究所 | Parameter configuration method, device and system of multi-channel high-speed analog-to-digital conversion chip |
| CN113483790A (en) * | 2021-06-18 | 2021-10-08 | 安徽龙联智能光电有限公司 | Distributed acoustic sensing phase demodulation method and system |
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Application publication date: 20171124 |