CN107666349B - High-precision multichannel high-speed data transmission link isometric detection method - Google Patents
High-precision multichannel high-speed data transmission link isometric detection method Download PDFInfo
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- CN107666349B CN107666349B CN201710729795.3A CN201710729795A CN107666349B CN 107666349 B CN107666349 B CN 107666349B CN 201710729795 A CN201710729795 A CN 201710729795A CN 107666349 B CN107666349 B CN 107666349B
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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
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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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
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
- H04B10/0775—Performance monitoring and 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
- H04B10/07—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
- H04B10/07—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
- H04B10/07953—Monitoring or measuring OSNR, BER or Q
Abstract
The invention discloses a high-precision multichannel high-speed data transmission link isometric detection method, which comprises the following steps: (1) acquiring a reference signal and a sampling signal of each transmission channel to be detected through an oscilloscope; (2) the acquired reference signal and sampling signal are led into a data processor (3) and the data processor extracts the sampling signal and the reference signal corresponding to each transmission channel and calculates the reference optical path difference; (4) the data processor calculates the relative optical path difference of any two transmission channels; and comparing the absolute value of the obtained relative optical path difference with a reference value to evaluate the data transmission consistency of each transmission channel. The invention can accurately detect the equal length and consistency of data transmission of each channel in the multi-channel high-speed data transmission link, has high measurement precision and wide application range, integrates the detection of the error rate into the transmission link, avoids secondary installation and adjustment, improves the working efficiency and reduces the cost.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a high-precision multichannel high-speed data transmission link isometric detection method.
Background
At present, when multi-channel data synchronous transmission detection is carried out, a coherent light coupling optical path measuring method is mostly adopted, and the optical coupling time is long, so that the precision of the measured optical path is poor, the consistency of data of each channel cannot be accurately measured, and the method is generally applied to a low-speed data transmission scene with low requirement on the consistency of data transmission of each channel. Meanwhile, in the prior art, the error rate and the signal consistency of the multichannel optical communication signals are respectively detected, and secondary installation and adjustment of corresponding equipment and components are needed, so that damage and waste of easily damaged original components such as optical fibers are easily caused.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a high-precision multichannel high-speed data transmission link isometric detection method, aiming at the above-mentioned deficiencies in the prior art. The method carries out accurate detection of high-consistency multichannel high-speed data synchronous transmission, and effectively integrates detection of the error rate of communication signals and detection of the consistency of data transmission of each channel, thereby avoiding secondary adjustment, improving the working efficiency and saving the cost.
It can be known from the prior knowledge that to ensure high consistency of data transmission of each channel, the optical path difference between any two channels needs to satisfy the following conditions:
△ represents optical path difference, c represents optical speed, N represents code element number, R represents data transmission rate, and A is influence coefficient, so as to ensure consistency of data of each channel, and can be detected by accurate optical path measurement.
In order to solve the technical problems, the invention adopts the technical scheme that: a high-precision multichannel high-speed data transmission link isometric detection method comprises the following steps:
(1) acquiring a reference signal and a sampling signal of each transmission channel to be detected through an oscilloscope;
(2) leading the acquired reference signal and sampling signal into a data processor to detect the data transmission consistency of each transmission channel;
(3) the data processor extracts a sampling signal and a reference signal corresponding to each transmission channel, calculates an optical path difference between the sampling signal and the reference signal, and records the optical path difference as a reference optical path difference;
(4) the data processor carries out difference operation on the calculated reference optical path difference of any two transmission channels, and calculates to obtain a relative optical path difference; comparing the absolute value of the obtained relative optical path difference with a reference value so as to evaluate the data transmission consistency of each transmission channel; and if the absolute value of the relative optical path difference between any two of all the transmission channels is not greater than the reference value, judging that the data transmission of each transmission channel meets the requirement of consistency.
Preferably, in the step (1), the method for acquiring the reference signal and the sampling signal specifically includes: transmitting an initial signal through an error code meter, wherein the initial signal is divided into two paths, one path is directly input into the oscilloscope and is collected by the oscilloscope to be used as a final reference signal; the other path of the sampling signal passes through a transmission channel to be detected to form a sampling signal, the sampling signal is divided into two paths, one path of the sampling signal is directly input into the oscilloscope and is collected by the oscilloscope to be used as a final sampling signal, the other path of the sampling signal returns to the error code meter, and the error rate of the transmission channel is synchronously detected; and repeating the operation so as to acquire the reference signal and the sampling signal of each transmission channel to be detected.
Preferably, in the step (1), the initial signal input to each transmission channel is kept the same, and the reference signal of each transmission channel is also the same.
Preferably, the step (1) further comprises: and the oscilloscope compares the acquired sampling signal with the reference signal to obtain a signal eye diagram for visual observation.
Preferably, in the step (3), the step of calculating the reference optical path difference of each transmission channel includes: the data processor extracts a sampling signal and a reference signal corresponding to the ith transmission channel, respectively performs signal spectrum analysis on the sampling signal and the reference signal to obtain a sampling signal spectrum and a reference signal spectrum, and respectively takes a phase value at the maximum value in the absolute value of the spectrum in the sampling signal spectrum
Reference to the phase value at the maximum of the absolute values of the frequency spectrum in the frequency spectrum of the signal
And making difference, calculating to obtain phase difference
Namely, it is
Will obtain the phase difference
Substituting the following formula to calculate the reference optical path difference △ of the ith transmission channeli；
Preferably, the step (4) includes taking the reference optical path difference △ of any two transmission channelsiAnd △jPerforming difference operation, namely the ith transmission channel and the jth transmission channel, to obtain a relative optical path difference △ijI.e. △ij＝△i-△jThe relative optical path difference is △ijComparing the data transmission with the reference value to evaluate the consistency of the data transmission of each transmission channel; wherein the reference value is
Wherein c represents the speed of light, N represents the number of symbols, R represents the data transmission rate, and A is an influence coefficient;
if the absolute value of the relative optical path difference between any two of all the transmission channels is not greater than the reference value, that is to say
Judging that the data transmission of each transmission channel meets the requirement of consistency;
where i ≠ 1,2,3 …, n, j ≠ 1,2,3 …, n, and i ≠ j, n denotes the total number of transmission channels.
Preferably, in the step (3), the data processor is preset to extract the sampling frequencies of the sampling signal and the reference signal corresponding to each transmission channel, and the sampling frequencies of each transmission channel are ensured to be the same.
Preferably, the transmission channel comprises an electrical amplifier, a laser, an intensity modulator, an optical amplifier, an optical splitter, a spatial optical path and an opto-electrical conversion module.
The invention has the beneficial effects that: the method for detecting the equal length of the high-precision multi-channel high-speed data transmission link can accurately detect the equal length and the consistency of the data transmission of each channel in the multi-channel high-speed data transmission link, has high measurement precision and wide application range, and integrates the detection of the error rate into the transmission link, thereby avoiding secondary installation and adjustment, improving the working efficiency and reducing the cost.
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FIG. 1 is a schematic diagram of a detection flow of the isometric detection method of the high-precision multi-channel high-speed data transmission link according to the present invention;
fig. 2 is a simplified process flow diagram of a data processor according to the present invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
It can be known from the prior knowledge that to ensure high consistency of data transmission of each channel, the optical path difference between any two channels needs to satisfy the following conditions:
△ represents optical path difference, c represents optical speed, N represents code element number, R represents data transmission rate, and A is influence coefficient, so as to ensure consistency of data of each channel, and can be detected by accurate optical path measurement.
The method for detecting the isometric performance of the high-precision multichannel high-speed data transmission link is characterized by comprising the following steps:
(1) acquiring a reference signal and a sampling signal of each transmission channel to be detected through an oscilloscope;
transmitting an initial signal through an error code meter, wherein the initial signal is divided into two paths, one path is directly input into the oscilloscope and is collected by the oscilloscope to be used as a final reference signal; the other path of the sampling signal passes through a transmission channel to be detected to form a sampling signal, the sampling signal is divided into two paths, one path of the sampling signal is directly input into the oscilloscope and is collected by the oscilloscope to be used as a final sampling signal, and the oscilloscope compares the collected sampling signal with a reference signal to obtain a signal eye diagram for an operator to visually observe; the other path of sampling signal returns to the error code meter, and the error rate of the transmission channel is synchronously detected so as to judge the data transmission accuracy of the transmission channel;
and repeating the operation so as to acquire the reference signal and the sampling signal of each transmission channel to be detected.
The initial signals input to each transmission channel are kept the same, and the reference signals of each transmission channel are the same as the initial signals of each transmission channel.
The transmission channel comprises an electric amplifier, a laser, an intensity modulator, an optical amplifier, an optical splitter (with a collimator at the front end), a spatial light path and a photoelectric conversion module.
(2) Leading the acquired reference signal and sampling signal into a data processor to detect the data transmission consistency of each transmission channel;
(3) the data processor extracts a sampling signal and a reference signal corresponding to each transmission channel, calculates an optical path difference between the sampling signal and the reference signal, and records the optical path difference as a reference optical path difference;
the step of calculating the reference optical path difference of each transmission channel comprises the following steps: the data processor extracts a sampling signal and a reference signal corresponding to the ith transmission channel, and respectively performs signal spectrum analysis on the sampling signal and the reference signal to obtain a sampling signalThe frequency spectrum and the reference signal frequency spectrum respectively take the maximum value in the absolute value of the frequency spectrum in the sampling signal frequency spectrum and the maximum value in the absolute value of the frequency spectrum in the reference signal frequency spectrum, and then respectively take the phase value at the maximum value in the absolute value of the frequency spectrum in the sampling signal frequency spectrum
Reference to the phase value at the maximum of the absolute values of the frequency spectrum in the frequency spectrum of the signal
And making difference, calculating to obtain phase difference
Namely, it is
Will obtain the phase difference
Substituting the following formula to calculate the reference optical path difference △ of the ith transmission channeli；
The preset data processor extracts the sampling frequency of the sampling signal and the reference signal corresponding to each transmission channel, and ensures that the sampling frequency for extracting the signal from each transmission channel is the same so as to eliminate interference.
In the signal spectrum analysis, a Fourier transform is adopted to process a sampling signal and a reference signal to obtain a sampling signal spectrum and a reference signal spectrum.
(4) The data processor carries out difference operation on the calculated reference optical path difference of any two transmission channels, and calculates to obtain a relative optical path difference; comparing the absolute value of the obtained relative optical path difference with a reference value so as to evaluate the data transmission consistency of each transmission channel; and if the absolute value of the relative optical path difference between any two of all the transmission channels is not greater than the reference value, judging that the data transmission of each transmission channel meets the requirement of consistency.
The method comprises the following specific steps of taking the reference optical path difference △ of any two transmission channelsiAnd △jPerforming difference operation to obtain relative optical path difference △ijI.e. △ij＝△i-△jThe relative optical path difference is △ijComparing the data transmission with the reference value to evaluate the consistency of the data transmission of each transmission channel; wherein the reference value is
Wherein c represents the speed of light, N represents the number of symbols, R represents the data transmission rate, and A is an influence coefficient;
if the absolute value of the relative optical path difference between any two of all the transmission channels is not greater than the reference value, that is to say
Judging that the data transmission of each transmission channel meets the requirement of consistency;
where i ≠ 1,2,3 …, n, j ≠ 1,2,3 …, n, and i ≠ j, n denotes the total number of transmission channels.
Because the reference signals of each transmission channel are the same, the same reference signals are used as the comparison reference of the sampling signals of each transmission channel, the reference optical path difference of each transmission channel is calculated, the reference optical path differences of any two transmission channels are subjected to difference operation (the influence of the reference signals is eliminated by the difference operation), the relative optical path difference of any two transmission channels is calculated, and then the relative optical path difference is compared with the reference value so as to evaluate the data transmission consistency of each transmission channel. Whether the equal length and consistency of data transmission of each channel in the multi-channel high-speed data synchronous transmission meet the requirements or not is accurately detected. The invention detects the consistency of data transmission of each transmission channel through accurate optical path measurement calculation, and simultaneously integrates an error code meter to synchronously detect the data transmission accuracy.
In another embodiment, the error code detector is changed into other signal emission sources, the error code detector is separated, and the signal of the signal emission source and the signal passing through the communication optical path are respectively received, so that the corresponding error rate is obtained.
Fig. 1 shows a detection flow diagram of the high-precision multichannel high-speed data transmission link equal-length detection method of the present invention, and fig. 2 shows a processing flow diagram of the data processor of the present invention. To facilitate an understanding of the invention.
While embodiments of the invention have been disclosed above, it is not limited to the applications listed in the description and the embodiments, which are fully applicable in all kinds of fields of application of the invention, and further modifications may readily be effected by those skilled in the art, so that the invention is not limited to the specific details without departing from the general concept defined by the claims and the scope of equivalents.
Claims (6)
1. A high-precision multichannel high-speed data transmission link isometric detection method is characterized by comprising the following steps:
(1) acquiring a reference signal and a sampling signal of each transmission channel to be detected through an oscilloscope;
(2) leading the acquired reference signal and sampling signal into a data processor to detect the data transmission consistency of each transmission channel;
(3) the data processor extracts a sampling signal and a reference signal corresponding to each transmission channel, calculates an optical path difference between the sampling signal and the reference signal, and records the optical path difference as a reference optical path difference;
(4) the data processor carries out difference operation on the calculated reference optical path difference of any two transmission channels, and calculates to obtain a relative optical path difference; comparing the absolute value of the obtained relative optical path difference with a reference value so as to evaluate the data transmission consistency of each transmission channel; if the absolute value of the relative optical path difference between any two of all the transmission channels is not greater than the reference value, judging that the data transmission of each transmission channel meets the requirement of consistency;
in the step (1), the method for acquiring the reference signal and the sampling signal specifically includes: transmitting an initial signal through an error code meter, wherein the initial signal is divided into two paths, one path is directly input into the oscilloscope and is collected by the oscilloscope to be used as a final reference signal; the other path of the sampling signal passes through a transmission channel to be detected to form a sampling signal, the sampling signal is divided into two paths, one path of the sampling signal is directly input into the oscilloscope and is collected by the oscilloscope to be used as a final sampling signal, the other path of the sampling signal returns to the error code meter, and the error rate of the transmission channel is synchronously detected; repeating the operation, thereby acquiring the reference signal and the sampling signal of each transmission channel to be detected;
the transmission channel comprises an electric amplifier, a laser, an intensity modulator, an optical amplifier, an optical splitter, a spatial light path and a photoelectric conversion module.
2. The method as claimed in claim 1, wherein in step (1), the initial signal input to each transmission channel is the same, and the reference signal input to each transmission channel is the same.
3. The method for detecting the isometric property of the high-precision multichannel high-speed data transmission link according to claim 1, wherein the step (1) further comprises: and the oscilloscope compares the acquired sampling signal with the reference signal to obtain a signal eye diagram for visual observation.
4. The method for detecting the isometric property of the high-precision multichannel high-speed data transmission link according to claim 1, wherein in the step (3), the step of calculating the reference optical path difference of each transmission channel includes: the data processor extracts a sampling signal and a reference signal corresponding to the ith transmission channel, respectively performs signal spectrum analysis on the sampling signal and the reference signal to obtain a sampling signal spectrum and a reference signal spectrum, and respectively takes a phase value at the maximum value in the absolute value of the spectrum in the sampling signal spectrum
Reference to the phase value at the maximum of the absolute values of the frequency spectrum in the frequency spectrum of the signal
And making difference, calculating to obtain phase difference
Namely, it is
Will obtain the phase difference
Substituting the following formula to calculate the reference optical path difference delta of the ith transmission channeli；
Wherein λ is the wavelength in vacuum; i is 1,2,3 …, n represents the total number of transmission channels.
5. The method for detecting the isometric property of the high-precision multichannel high-speed data transmission link according to claim 4, wherein the step (4) comprises the following steps: taking the reference optical path difference delta of any two transmission channelsiAnd ΔjPerforming difference operation, namely the ith transmission channel and the jth transmission channel, to obtain a relative optical path difference deltaij，Δij＝Δi-Δj(ii) a Then the relative optical path difference delta is adjustedijComparing the data transmission with the reference value to evaluate the consistency of the data transmission of each transmission channel;
wherein the reference value is
Wherein c represents the speed of light, N represents the number of symbols, R represents the data transmission rate, and A is an influence coefficient;
if the absolute value of the relative optical path difference between any two of all the transmission channels is not greater than the reference value, that is to say
Judging that the data transmission of each transmission channel meets the requirement of consistency;
where i ≠ 1,2,3 …, n, j ≠ 1,2,3 …, n, and i ≠ j, n denotes the total number of transmission channels.
6. The method according to claim 1, wherein in step (3), the data processor is preset to extract the sampling frequencies of the sampling signal and the reference signal corresponding to each transmission channel, and the sampling frequencies of each transmission channel are guaranteed to be the same.
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