CN103326775B - On-line detection method and device for optical network failures - Google Patents
On-line detection method and device for optical network failures Download PDFInfo
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- CN103326775B CN103326775B CN201210077852.1A CN201210077852A CN103326775B CN 103326775 B CN103326775 B CN 103326775B CN 201210077852 A CN201210077852 A CN 201210077852A CN 103326775 B CN103326775 B CN 103326775B
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Abstract
The invention provides an on-line detection method and device for optical network failures. The on-line detection method for the optical network failures comprises the steps that generated pseudorandom sequences with two-value correlated characteristics are used for modulating data signals to be sent, and then the data signals are continuously sent to an optical fiber; after the first set of pseudorandom sequences is sent, modulated optical signals which are reflected back or scattered back in the optical fiber are subjected to photovoltaic conversion, amplification and filtering processing, processed analog signals are subjected to synchronous sampling processing to obtain sampling data, and after the sampling data are subjected to accumulation and related processing, OTDR curve data are obtained for event detection. According to the on-line detection method and device for the optical network failures, the pseudorandom sequences with the two-value correlated characteristics are used for modulating the data signals, demodulation and related processing are carried out at a receiving end, and the problems of poor wave shape quality and the like in the prior art are well solved.
Description
Technical field
The present invention relates to technical field of optical fiber communication, more particularly, to a kind of optical network fault online test method and device.
Background technology
Fiber optic communication is the prevailing transmission means of modern communication networks, and its birth and development are once important in telecommunication history
Revolution, is listed as the technology of the nineties in 20th century with satellite communication, mobile communication.
With the ripe development of Fibre Optical Communication Technology and the continuous promotion of " integration of three networks " demand for services, in a lot of communication networks
In network, widely used fiber medium is transmitted, and at present in optical-fiber network test, diagnosis, is substantially all and adopts offline mode.
This method needs to force disconnection business, and coverage is big, efficiency is low, so being badly in need of the work(in optical-fiber network with on-line checking
Energy.At present also have in some optical network systems and adopt external traditional optical time domain reflectometer (otdr), carried out using the 3rd wavelength
Online light path detection, but this method high cost, operation and networking are complex.
Traditional otdr measuring method is pulse method, obtains the tool of fiber optic network case point by launching individual pulse
Body detailed information, such as fibre-optical splice, bending and breakpoint etc..
The patent of existing online otdr measurement has the European patent of Patent No. ep1884758a1, and it describes to use
The optical module control loop of the otdr measurement of sine sweep mode, is a kind of scheme of sine wave frequency sweep.As shown in figure 1, with height
Fast data obtains the frequency response (amplitude and phase place) of certain frequency signal as carrier wave, sine wave as modulated signal in receiving area, then
Frequency is tested one by one, is so obtained with certain frequency response, finally carries out inversefouriertransform it is possible to obtain
The shock response curve of its corresponding time domain.
Although said method is to identify strong case point in optical fiber, such scheme adopts sinusoidal signal frequency sweep, institute
The frequency of scanning is limited, and the waveform after the error in side circuit makes to convert deteriorates to a certain extent it is difficult to telling and being
Which type of event, also limits its range of application.
Content of the invention
Embodiments provide a kind of optical network fault online test method and device, swept using sine wave with overcoming
The shortcoming of the waveform difference that frequency method occurs after inversefouriertransform.
Embodiments provide a kind of optical network fault on-line measuring device, this device includes:
Test controller, for sending control signal to pseudo-random sequence generator, and is detecting described pseudorandom
After sequencer has sent first group of pseudo-random sequence, send synchronous sampling signal to analog-digital converter, receive described mould
The sampled data that number converter sends, obtains optical time domain reflection (otdr) after described sampled data is carried out with cumulative and relevant treatment
Curve data, then exported to the equipment for event detection by communication interface；
Described pseudo-random sequence generator, is connected with described test controller, for being sent according to described test controller
Described control signal generate the pseudo-random sequence with two-value correlation properties, and send described pseudorandom sequence to modulating driver
Row；
Described modulating driver, is connected with described pseudo-random sequence generator, occurs for receiving described pseudo-random sequence
The described pseudo-random sequence that device sends, is continuously transmitted after being modulated to sent data signal using described pseudo-random sequence
To optical fiber；
Described analogue signal receiving processing module, reflects or scatters for receiving the optical signal of returning in described optical fiber, right
Described optical signal exports to analog-digital converter after carrying out opto-electronic conversion, amplification and filtering；
Described analog-digital converter, is all connected with described test controller and analogue signal receiving processing module, for basis
The synchronous sampling signal that described test controller sends, the analogue signal after described analogue signal receiving processing module is processed is entered
Row synchronized sampling processes and obtains sampled data, and described sampling data transmitting is given described test controller.
Preferably, described test controller, specifically for the measurement parameter that inputted according to described communication interface to pseudorandom
Sequencer sends control signal；Described measurement parameter includes pulse width and sequence length；Or, pulse width and generation
The number of described pseudo-random sequence depositor.
Preferably, described test controller, specifically for carrying out to described sampled data calculating averagely after addition adds up
Value；Described pseudo-random sequence is transformed into bipolarity pseudo-random sequence, by described meansigma methodss and described bipolarity pseudo-random sequence
Carry out correlation, obtain described otdr curve data.
The embodiment of the present invention additionally provides a kind of optical network fault online test method, and the method includes:
Connect after being modulated to sent data signal using the pseudo-random sequence with two-value correlation properties generating
Supervention delivers to optical fiber；
After having sent pseudo-random sequence described in first group, after the modulation that reflection in described optical fiber or scattering are returned
Optical signal carry out opto-electronic conversion, amplification, Filtering Processing process after analogue signal synchronize sampling processing obtain sampled data,
Obtain optical time domain reflection (otdr) curve data after described sampled data is carried out with cumulative and relevant treatment and be used for event detection.
Preferably, the described pseudo-random sequence with two-value correlation properties using generation is entered to sent data signal
Continuously transmit after row modulation and include to optical fiber:
Measurement parameter according to setting generates the positive sequence with two-value correlation properties, using described positive sequence to be sent
Data signal be modulated after continuously transmit to optical fiber；And, the measurement parameter according to setting generates has the related spy of two-value
The antitone sequence of property, is continuously transmitted to described optical fiber after being modulated to sent data signal using described antitone sequence.
Preferably, described after having sent pseudo-random sequence described in first group, to reflecting in described optical fiber or be scattered back
Come modulation after optical signal carry out opto-electronic conversion, amplifications, Filtering Processing process after analogue signal synchronize sampling processing
Obtain sampled data, obtain optical time domain reflection (otdr) curve data after described sampled data is carried out with cumulative and relevant treatment and use
In event detection, comprising:
After having sent positive sequence described in first group, believe to reflecting in described optical fiber or scattering the light after the modulation returned
Number carry out opto-electronic conversion, the analogue signal after amplification, Filtering Processing are processed synchronizes sampling processing and obtains the first sampled data,
Described first sampled data is carried out addition add up after calculate the first meansigma methodss, from sent antitone sequence described in first group it
Afterwards, in described optical fiber reflect or scattering return modulation after optical signal carry out opto-electronic conversion, amplifications, Filtering Processing process after
Analogue signal synchronize sampling processing obtain the second sampled data, described second sampled data is carried out addition add up after count
Calculate the second meansigma methodss, the sequence of differences of described positive sequence and described first meansigma methodss and described second meansigma methodss is carried out phase
Close, obtain described otdr curve data.
Preferably, the described pseudo-random sequence with two-value correlation properties using generation is entered to sent data signal
Continuously transmit after row modulation and include to optical fiber:
Measurement parameter according to setting generates the pseudo-random sequence with two-value correlation properties, using described pseudo-random sequence
Continuously transmit to optical fiber after being modulated to sent data signal；
Described described sampled data is carried out with cumulative and relevant treatment after obtain optical time domain reflection (otdr) curve data and use
In event detection, comprising:
Described sampled data is carried out after addition adds up, calculate meansigma methodss；Described pseudo-random sequence is transformed into bipolarity
Pseudo-random sequence, described meansigma methodss and described bipolarity pseudo-random sequence is carried out related, obtains described otdr curve data.
Preferably, the described sequence of differences by described positive sequence and described first meansigma methodss and described second meansigma methodss is carried out
Related inclusion:
Described positive sequence is extended to carry out to described sequence of differences after two groups of identical sequences related；Or
Described sequence of differences is extended to carry out to described positive sequence after two groups of identical sequences related.
Preferably, methods described also includes:
The described measurement parameter according to setting generates pseudo-random sequence, positive sequence or the antitone sequence with two-value correlation properties
Afterwards, one or more code elements are inserted before each code element in corresponding pseudo-random sequence, or, every in corresponding pseudo-random sequence
One or more code elements are inserted after individual code element；Described code element is fixed numbers.
Preferably, described fixed numbers include zero.
Above-mentioned optical network fault online test method and device, using the pseudo-random sequence logarithm with two-value correlation properties
It is believed that number being modulated, being demodulated and relevant treatment in receiving terminal, preferably solving waveform matter present in prior art
Amount poor, detection has high demands, frequency sweep time length, algorithm complexity the problems such as.
Brief description
Fig. 1 is the output photosignal waveform schematic diagram of existing sine wave modulation high-speed data signal；
Fig. 2 is the structural representation of the optical network fault on-line measuring device embodiment of the present invention；
Fig. 3 a is the flow chart of pseudo-random sequence measuring method embodiment one of the present invention；
Fig. 3 b is the flow chart of pseudo-random sequence measuring method embodiment two of the present invention；
Fig. 4 a is the waveform diagram of pseudo-random sequence of the present invention；
Fig. 4 b uses the waveform diagram after pseudorandom sequence modulates for the present invention；
Fig. 4 c uses the envelope waveform schematic diagram after pseudo-random sequence demodulation for the present invention；
Fig. 5 is the conversion oscillogram of pseudo-random sequence of the present invention；
Fig. 6 is the oscillogram after pseudo-random sequence auto-correlation of the present invention.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, below in conjunction with accompanying drawing to the present invention
Embodiment be described in detail.It should be noted that in the case of not conflicting, in embodiment in the application and embodiment
Feature can mutual combination in any.
As shown in Fig. 2 the structural representation of the optical network fault on-line measuring device embodiment for the present invention, this device bag
Include: test controller 21, pseudo-random sequence generator 22, modulating driver 23, analogue signal receiving processing module 24 and modulus
Transducer (adc) 25, this analogue signal receiving processing module can include photodiode (pd), trans-impedance amplifier (tia), increase
Beneficial adjustable amplifier and wave filter, wherein:
Test controller, for sending control signal to pseudo-random sequence generator, and is detecting described pseudorandom
After sequencer has sent first group of pseudo-random sequence, send synchronous sampling signal to analog-digital converter, receive described mould
The sampled data that number converter sends, obtains optical time domain reflection (otdr) after described sampled data is carried out with cumulative and relevant treatment
Curve data, then exported to the equipment for event detection by communication interface；
Described pseudo-random sequence generator, is connected with described test controller, for being sent according to described test controller
Described control signal generate the pseudo-random sequence with two-value correlation properties, and send described pseudorandom sequence to modulating driver
Row；
Described modulating driver, is connected with described pseudo-random sequence generator, occurs for receiving described pseudo-random sequence
The described pseudo-random sequence that device sends, is continuously transmitted after being modulated to sent data signal using described pseudo-random sequence
To optical fiber；
Described analogue signal receiving processing module, reflects or scatters for receiving the optical signal of returning in described optical fiber, right
Described optical signal exports to analog-digital converter after carrying out opto-electronic conversion, amplification and filtering；
Described analog-digital converter, is all connected with described test controller and analogue signal receiving processing module, for basis
The synchronous sampling signal that described test controller sends, the analogue signal after described analogue signal receiving processing module is processed is entered
Row synchronized sampling processes and obtains sampled data, and described sampling data transmitting is given described test controller.
Above-mentioned wave filter can be band filter or low pass filter；Said apparatus are located at measurement point.
Above-mentioned test controller can be sent out to pseudo-random sequence generator according to the measurement parameter of described communication interface input
Send control signal；Described measurement parameter includes pulse width and sequence length；Or, pulse width and produce described pseudorandom sequence
The number of column register, the number of described depositor can be calculated using equation below:
Wherein, m is the number of described depositor, lmaxThe optical-fiber network measuring for described measurement point to described device farthest
The distance of point, v is spread speed in described optical fiber for the light,X is spatial resolution.
The embodiment of the present invention additionally provides a kind of optical network fault online test method, the method utilize pseudo-random sequence Lai
Modulate the amplitude of high-speed data signal to be sent, when receiving, filter reflection, back scattering in optical fiber with low pass filter
The high speed signal returned, retains the low-frequency component related to pseudo-random sequence.Here pseudo-random sequence auto-correlation has two-value
Characteristic, by carrying out simple transformation process to pseudo-random sequence, makes the waveform after correlation be otdr curve waveform, hence with this
Plant pseudo-random sequence and just can reproduce otdr curve.
The optical network fault online test method that the present invention provides includes:
Step one, using generate the pseudo-random sequence with two-value correlation properties adjusted to sent data signal
Continuously transmit to optical fiber after system；
This step can be: the measurement parameter according to input generates the pseudo-random sequence with two-value correlation properties；Described
Using generate the pseudo-random sequence with two-value correlation properties be modulated to sent data signal after continuously transmit to
Optical fiber includes: the measurement parameter according to setting generates the positive sequence with two-value correlation properties, using described positive sequence to pending
The data signal sent continuously transmits to optical fiber after being modulated；And, the measurement parameter according to setting generates has two-value correlation
The antitone sequence of characteristic, is continuously transmitted to described optical fiber after being modulated to sent data signal using described antitone sequence.
Step 2, after having sent pseudo-random sequence described in first group, in described optical fiber reflect or scattering return
Optical signal after modulation carry out opto-electronic conversion, amplification, Filtering Processing process after analogue signal synchronize sampling processing obtain
Sampled data, obtains otdr curve data after described sampled data is carried out with cumulative and relevant treatment and is used for event detection.
After having sent pseudo-random sequence described in first group, according to measurement parameter to reflecting in described optical fiber or be scattered back
Come modulation after optical signal carry out opto-electronic conversion, amplifications, Filtering Processing process after analogue signal synchronize sampling processing
Obtain sampled data, after described sampled data is carried out with cumulative relevant treatment, obtain otdr curve data.
The described modulation after having sent pseudo-random sequence described in first group, reflection in described optical fiber or scattering returned
Optical signal afterwards carry out opto-electronic conversion, amplification, Filtering Processing process after analogue signal synchronize sampling processing obtain sampling
Data, obtains optical time domain reflection (otdr) curve data after described sampled data is carried out with cumulative and relevant treatment and is used for event and examine
Survey, comprising:
After having sent positive sequence described in first group, believe to reflecting in described optical fiber or scattering the light after the modulation returned
Number carry out opto-electronic conversion, the analogue signal after amplification, Filtering Processing are processed synchronizes sampling processing and obtains the first sampled data,
Described first sampled data is carried out addition add up after calculate the first meansigma methodss, from sent antitone sequence described in first group it
Afterwards, in described optical fiber reflect or scattering return modulation after optical signal carry out opto-electronic conversion, amplifications, Filtering Processing process after
Analogue signal synchronize sampling processing obtain the second sampled data, described second sampled data is carried out addition add up after count
Calculate the second meansigma methodss, the sequence of differences of described positive sequence and described first meansigma methodss and described second meansigma methodss is carried out phase
Close, obtain described otdr curve data.
It should be noted that including after having sent pseudo-random sequence described in first group: start to send puppet described in second group
During random sequences；Certainly, include after having sent positive sequence described in first group: when starting to send positive sequence described in second group；Send out
Include after having sent antitone sequence described in first group: when starting to send antitone sequence described in second group.
As shown in Figure 3 a, be pseudo-random sequence measuring method embodiment one of the present invention flow chart, this process includes:
Step 301a, it is arranged as required to measurement of correlation parameter；
The parameter of pseudo-random sequence generator will be first set before measurement, and described measurement parameter includes pulse width and sequence
Length；Or, the number of pulse width and the described pseudo-random sequence depositor of generation.Need during the length calculating pseudo-random sequence
Estimate optical fiber maximum distance, pseudo-random sequence requires there is two-value correlation properties.
Step 302a, according to measurement parameter generate pseudo noise code, pseudo noise code is transformed into positive and negative two kinds of sequences, such as p
Sequence and (1-p) sequence；
Step 303a, continuously transmit using after p sequence modulation；
Modulating driver controls pseudo-random sequence waveform modulated on high-speed data signal, and in measurement process,
Pseudo-random sequence continuously transmits.If the corresponding luminous power of normalization high-speed data logical one is 1, modulation degree is a.Typically
In the case of, a is smaller, is between 5%～15%, to ensure not affecting proper communication." 0 " respective amplitude of pseudo-random sequence is
1-a, " 1 " corresponding amplitude of pseudo-random sequence is 1+a.
In order to remove the impact of the extra DC component of receiving terminal, measured using bipolarity measurement sequence here, examine
Considering light pulse does not have negative signal, sends out two kinds of unipolar sequences here, and after adc, correspondence is subtracted each other, and thus replaces bipolarity.
Step 304a- step 305a, analogue signal receiving processing module change into the optical signal of reception after the signal of telecommunication, with low
Logical or band filter can obtain the system response signal that pseudo-random sequence causes, then peak signal is amplified to suitable adc
The interval of sampling, and the signal when starting to send second group of sequence, after synchronized sampling amplification；
Step 306a, the sequence to sampling carry out addition and add up, and take average s after repeatedly measuringa；
If such as p sequence measuring n time of the first sequence in two kinds of unipolar sequences, then second sequence such as (1-
P) sequence also n time to be measured, after sampling, after the data of two kinds of sequence measurings is subtracted each other, then be averaging (or also subtract each other again after average
Can, at this moment the pendulous frequency of two kinds of sequences can be not quite identical).
Here one-shot measurement is calculated with one group of complete sequence of sampling from continuous sequence it is also possible to sampling is multigroup complete
Sequence calculates one-shot measurement.
Step 307a, according to the method shown in step 303a-3036a, using 1-p sequence modulation data signal, and sample,
Carry out addition to add up, repeatedly measurement takes average sb；
Step 308a, former pseudo-random sequence is p sequence and (sa-sb) related；
Related operation for convenience, before related operation, calculates the number of one-shot measurement for one group of complete sequence of sampling
According to, be at least extended to two groups of identical sequences, to former pseudo-random sequence carry out related；Or former pseudo-random sequence is at least extended to
Two groups of identical sequences, to the data surveyed carry out related.If in step 306a, to sample, multigroup complete sequence calculates one
If secondary measurement, just directly can carry out to former pseudo-random sequence related here, need not extend again.
Step 309a, correlated results is delivered to subsequent conditioning circuit process, terminate measurement.
This result is used for event detection.
As shown in Figure 3 b, be pseudo-random sequence measuring method embodiment two of the present invention flow chart, shown in this process and Fig. 2
Process is similar to, as long as difference is this process sends a kind of sequence, and only does addition and adds up, average after, p sequence associated with it
Row need to be transformed into bipolar sequence (2p-1).
It should be noted that in actual measurement, slotting " 0 " can be done during above two is realized and process, that is, exist
Before each code element, (or rear) insertion is single or continuously multiple " 0 ", and it still can ensure that the pseudo-random sequence after conversion has
Two-value correlation properties.
Pseudo-random sequence as shown in fig. 4 a can be generated using said method, using the sequence shown in Fig. 4 a adjustable make as
Waveform shown in Fig. 4 b, Fig. 4 c is the envelope waveform after demodulation.
In a word, using said method, reached the effect improving surveyed waveform quality, greatly reduced time of measuring and connect
Receive the complexity of algorithm, improve the accuracy of event recognition.
Embodiment one
As shown in figure 5, being the conversion oscillogram of pseudo-random sequence of the present invention, measurement sequence used is using pseudorandom sequence
There is after row auto-correlation the characteristic of two-value, the m-sequence 100010011010111 of such as 15 is produced by pseudo-random sequence generator,
Two kinds of sequences p and 1-p, continuous p sequence f is become after conversion1(n) representing, continuous 1-p sequence f2N () represents,
It is f with the former relation2(n)=1-f1(n), f1(n)-f2N () obtains one group of ambipolar continuous sequence f3(n), it and f1(n)
It is also diadic after correlation, as shown in Figure 6.
Wherein, m is the number producing pseudo-random sequence depositor, and k is any integer.
Sending pseudo-random sequence will have two parameters, and one is pulse width；Two is sequence length (2m, or produce pseudo- -1)
Number m of random sequences depositor.Spatial resolution data speed as needed arranges pulse width t to weigh, if comprehensive
The spatial resolution closed after considering is x, and v is light spread speed in a fiber, thenAdditionally need and estimate from survey
Amount point is to the solstics of optical-fiber network apart from lmax.
In order to reduce time of measuring, reduce computation complexity, need to calculate the number of minimum required depositor, if m is
The number of depositor, then meetM value, referred to as optimal preferred value.
The first two parameter setting is over, and can measure.When starting measurement, continuously transmit pseudo-random sequence p, previous group
Sequence and later group sequence can not have time interval, or time interval is 0, and the related binary feature of such guarantee is not broken
Bad.
Send p sequence, carry out after adc addition add up, during measurement it is noted that will from sent first group of p sequence it
Afterwards, start when sending second group of p sequence, to start synchronous averaging adc to be sampled, distribute one group of sequence p, sample one group
Data, calculates one-shot measurement, has retransmited another group of sequence p, samples another group of data again, calculates another one-shot measurement.Later group number
Add up according to carrying out corresponding to addition with the data above surveyed.
After measurement n time, send 1-p sequence elsewhere, carry out subtraction after adc and add up, carried out according to foregoing method
Measurement, is added to the data correspondence of measurement in the data of measurement former sequence p, also measures n time.It is actually by two kinds
The operation that not homotactic measurement data is subtracted each other, then be averaging, average after data be sequence s.P sequence and 1-p sequence
Transmission there is no tandem, only it is noted that addition or subtraction.
When s sequence is related with p sequence, in order to related operation is convenient, at least need for s (or p) to be extended to two groups of complete phases
Same sequence, then carry out correlation with another kind of sequence p (or s).Particularly relevant computational methods are as follows:
Wherein s2={ s, s }, p2={ p, p }
Finally the data after correlation is given subsequent process circuit analyzing and processing.
Embodiment two
Difference with embodiment one is that before each code element in pseudo-random sequence, (or rear) insertion " 0 ", can insert one
" 0 " is it is also possible to insert multiple continuous " 0 ".In order to ensure the binary feature of correlation, need to do some process.Herein for explanation
Convenient, taking insert one " 0 " as a example, the difference that with embodiment 1 process is discussed in detail.
In order to the difference with embodiment 1 is described, herein still, the pseudo-random sequence producing is carried out taking 15 m-sequence as a example
Insert " 0 " operation, the p sequence (100010011010111) of 15 is transformed to the p ' sequence (1x-0x-0x-0x-1x-0x- of 30
0x-1x-1x-0x-1x-0x-1x-1x-1x), the 1-p sequence (011 101100101000) of 15 be transformed to 30 (1-p) '
Sequence (0x-1x-1x-1x-0x-1x-1x-0x-0x-1x-0x-1x-0x-0x-0x).This is just continuously transmitted when sending measurement sequence
Two kinds of sequence p ' and (1-p) ', receiving circuit ad sampling clock needs synchronous with this sequence tranmitting data register.
Here explaining above-mentioned inserting in " 0 " method is that bipolarity pseudo-random sequence is inserted after " 0 " still the reason can insert " x "
Related binary feature can be kept, in the present embodiment, as long as after ensureing that two kinds of sequences are subtracted each other, the value of the position of " 0 " will be inserted
For 0 just, if that is, two sequence pair answer positional value the same, the value after they subtract each other is exactly 0.Here x can take in theory
Any value, as long as do not affect the communication of data service.
Before receiving circuit part relevant treatment, also in advance p sequence to be become p ' sequence, other operating procedures and enforcement
Example one is identical.
To the depositor number producing pseudo-random sequence, its calculation is equally also required to adjust.If light is in optical fiber
In speed be v, pulse width is t, and m is the number of depositor, and the number of every bit code insertion continuous " 0 " is n, then most preferably preferred
It is worth for meeting inequalityM value.
Embodiment three
In order to the difference with embodiment one is described, herein also, transmitting terminal only sends continuous p taking the m-sequence of 15 as a example
Sequence (100010011010111), i.e. f in embodiment one1N (), receiving terminal also only receives a kind of sequence, carries out cumulative mean
Carry out related operation afterwards again.Another sequence when related will do a down conversion, becomes continuous 2p-1 sequence (1-1-1-1 1-
1-1 1 1-1 1-1 11 1), i.e. f in embodiment 13N (), other method and steps are with embodiment one.
During this method measurement, as long as sending a kind of continuous pseudo-random sequence, simplify the complexity sending and receiving device
Degree.Shortcoming is that the extra DC component that receiving terminal is introduced is more sensitive, so it should be noted that dropping as much as possible during practical application
Low extra DC component, it is of course also possible to eliminate extra DC component by specific algorithm.
One of ordinary skill in the art will appreciate that all or part of step in said method can be instructed by program
Related hardware completes, and said procedure can be stored in computer-readable recording medium, such as read only memory, disk or CD
Deng.Alternatively, all or part of step of above-described embodiment can also be realized using one or more integrated circuits.Accordingly
Ground, each module/unit in above-described embodiment can be to be realized in the form of hardware, it would however also be possible to employ the shape of software function module
Formula is realized.The present invention is not restricted to the combination of the hardware and software of any particular form.
Above example only in order to technical scheme to be described and unrestricted, reference only to preferred embodiment to this
Bright it has been described in detail.It will be understood by those within the art that, technical scheme can be modified
Or equivalent, without deviating from the spirit and scope of technical solution of the present invention, all should cover the claim model in the present invention
In the middle of enclosing.
Claims (6)
1. a kind of optical network fault on-line measuring device is it is characterised in that this device includes:
Test controller, the measurement parameter for being inputted according to communication interface sends control signal to pseudo-random sequence generator,
And after described pseudo-random sequence generator is detected and having sent first group of pseudo-random sequence, send same to analog-digital converter
Step sampled signal, receives the sampled data that described analog-digital converter sends, and described sampled data is carried out calculate after addition adds up
Go out meansigma methodss, described pseudo-random sequence be transformed into bipolarity pseudo-random sequence, by pseudo- to described meansigma methodss and described bipolarity with
Machine sequence carries out correlation, obtains optical time domain reflection otdr curve data, then is exported to for event detection by communication interface
Equipment；Described measurement parameter includes pulse width and sequence length；Or, pulse width and the described pseudo-random sequence of generation are deposited
The number of device；
Described pseudo-random sequence generator, is connected with described test controller, for the institute being sent according to described test controller
State control signal and generate the pseudo-random sequence with two-value correlation properties, and send described pseudo-random sequence to modulating driver；
The positive sequence that the described pseudo-random sequence with two-value correlation properties includes having two-value correlation properties is related with having two-value special
The antitone sequence of property；
Described modulating driver, is connected with described pseudo-random sequence generator, sends out for receiving described pseudo-random sequence generator
The described pseudo-random sequence sent, is continuously transmitted to optical fiber after being modulated to sent data signal using described positive sequence,
Continuously transmit to described optical fiber after being modulated to sent data signal using described antitone sequence；
Analogue signal receiving processing module, for receive in described optical fiber reflect or scattering return optical signal, to described light believe
Export to analog-digital converter after number carrying out opto-electronic conversion, amplification and filtering；
Described analog-digital converter, is all connected with described test controller and analogue signal receiving processing module, for according to described
The synchronous sampling signal that test controller sends, the analogue signal after described analogue signal receiving processing module is processed carries out same
Step sampling processing obtains sampled data, and described sampling data transmitting is given described test controller.
2. a kind of optical network fault online test method is it is characterised in that the method includes:
Believed to sent data using the pseudo-random sequence with two-value correlation properties that the measurement parameter according to setting generates
Continuously transmit to optical fiber after number being modulated, comprising: the measurement parameter according to setting generates the positive sequence with two-value correlation properties
Row, are continuously transmitted to optical fiber after being modulated to sent data signal using described positive sequence；And, according to the survey of setting
Amount parameter generates the antitone sequence with two-value correlation properties, after being modulated to sent data signal using described antitone sequence
Continuously transmit to described optical fiber；Described measurement parameter includes pulse width and sequence length；Or, pulse width and generation are described
The number of pseudo-random sequence depositor；
After having sent pseudo-random sequence described in first group, believe to reflecting in described optical fiber or scattering the light after the modulation returned
Number carry out opto-electronic conversion, amplification, Filtering Processing, the analogue signal after process synchronizes sampling processing and obtains sampled data, right
Described sampled data carries out calculating meansigma methodss after addition adds up, and described pseudo-random sequence is transformed into bipolarity pseudorandom sequence
Row, described meansigma methodss and described bipolarity pseudo-random sequence are carried out related, obtain optical time domain reflection otdr curve data, are used for
Event detection.
3. method according to claim 2 it is characterised in that:
Described after having sent pseudo-random sequence described in first group, in described optical fiber reflect or scattering return modulation after
Optical signal carries out opto-electronic conversion, amplification, Filtering Processing, and the analogue signal after process synchronizes sampling processing and obtains hits
According to, obtain optical time domain reflection otdr curve data after described sampled data is carried out with cumulative and relevant treatment and be used for event detection,
Including:
After having sent positive sequence described in first group, the optical signal reflecting in described optical fiber or scatter after the modulation returned is entered
Row opto-electronic conversion, amplification, Filtering Processing, the analogue signal after process synchronizes sampling processing and obtains the first sampled data, right
Described first sampled data carries out calculating the first meansigma methodss after addition adds up, after having sent antitone sequence described in first group,
Opto-electronic conversion, amplification, Filtering Processing are carried out to the optical signal reflecting in described optical fiber or scatter after the modulation returned, after process
Analogue signal synchronizes sampling processing and obtains the second sampled data, described second sampled data is carried out calculate after addition adds up
Go out the second meansigma methodss, described positive sequence and the sequence of differences of described first meansigma methodss and described second meansigma methodss carried out related,
Obtain described otdr curve data.
4. method according to claim 3 it is characterised in that:
Described by described positive sequence and the sequence of differences of described first meansigma methodss and described second meansigma methodss carry out related include:
Described positive sequence is extended to carry out to described sequence of differences after two groups of identical sequences related；Or
Described sequence of differences is extended to carry out to described positive sequence after two groups of identical sequences related.
5. the method according to claim 2-4 any claim is it is characterised in that methods described also includes:
Described according to setting measurement parameter generate have two-value correlation properties pseudo-random sequence, positive sequence or antitone sequence it
Afterwards, insert one or more code elements before each code element in corresponding pseudo-random sequence, or, in corresponding pseudo-random sequence each
One or more code elements are inserted after code element；Described code element is fixed numbers.
6. method according to claim 5 it is characterised in that:
Described fixed numbers include zero.
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| CN103326776B (en) * | 2012-03-23 | 2016-12-14 | 南京中兴软件有限责任公司 | A kind of measuring method detecting optical network fault and device |
| CN104734778B (en) * | 2013-12-20 | 2018-01-30 | 中国移动通信集团公司 | The sending, receiving method and device of a kind of data-signal and monitoring signals |
| WO2016033812A1 (en) * | 2014-09-05 | 2016-03-10 | 华为技术有限公司 | Optical time domain reflectometer and method thereof for detecting optical fiber |
| CN105450293A (en) * | 2014-09-30 | 2016-03-30 | 华为技术有限公司 | Optical fiber connection state detection method, device and equipment |
| CN105763261B (en) * | 2016-02-24 | 2018-08-07 | 烽火通信科技股份有限公司 | A kind of carrier communication method and system based on laser load-modulate |
| CN107291422B (en) * | 2017-06-09 | 2020-08-11 | 中国电子科技集团公司第四十一研究所 | Method for generating user-defined length zero-replacement PRBS graph |
| CN114172565B (en) * | 2021-12-03 | 2023-05-23 | 上海橙科微电子科技有限公司 | Channel quality detection method and system |
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