CN107147440A - The apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel - Google Patents
The apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel Download PDFInfo
- Publication number
- CN107147440A CN107147440A CN201710094483.XA CN201710094483A CN107147440A CN 107147440 A CN107147440 A CN 107147440A CN 201710094483 A CN201710094483 A CN 201710094483A CN 107147440 A CN107147440 A CN 107147440A
- Authority
- CN
- China
- Prior art keywords
- channel
- signal
- measured
- noise
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H04B10/07955—Monitoring or measuring power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/0213—Groups of channels or wave bands arrangements
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0223—Conversion to or from optical TDM
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Abstract
The apparatus and method of nonlinear effect, belong to field of high-speed optical communications between a kind of measurement WDM fiber communication system channel.Step is：1) pilot signal is added to channel to be measured in transmitting terminal；2) receive channel signal to be measured and extract pilot frequency sequence signal；3) pilot signal is transformed into frequency domain, calculates the spontaneous emission noise power in channel to be measured；4) time-domain pilot signal is transformed into fractional order domain through Optimal order Fourier Transform of Fractional Order；5) calculate the power that Optimal order fractional order domain obtains all signals outside impulse, obtain in whole channel to be measured the power of spontaneous emission noise and interchannel nonlinear noise and, abbreviation power and；6) power of spontaneous emission noise and interchannel nonlinear noise and the spontaneous emission noise power in 3) channel to be measured is subtracted in channel to be measured, obtains the watt level of interchannel nonlinear noise.The present invention can more accurately measure the nonlinear noise power between WDM fiber communication system channel.
Description
Technical field
The present invention relates to a kind of apparatus and method of nonlinear effect between measurement WDM fiber communication system channel, wherein WDM
Wavelength-division multiplex is represented, belongs to field of high-speed optical communications.
Background technology
As user is to the raising of access network bandwidth and increasing for number of users, the capacity of optical fiber transmission network further adds
Greatly, this modulation format for being accomplished by higher order and Geng Gao spectrum efficiency；The thing followed is the increasing of fiber nonlinear effect,
Fiber nonlinear effect can cause systematic function to reduce, during following optical transmission system design and operation, nonlinear fiber
The monitoring of effect is most important.
The measurement index of nonlinear effect typically has two kinds in division multiplex fibre-optic communication wave system, and one kind is to non-linear effect
The measurement for the phase offset that should be caused, another is, as additive noise, to measure its absolute power nonlinear effect.
The phase offset that nonlinear effect is caused can change with the difference for sending signal and have randomness, and
The absolute power of measurement nonlinear noise is to take the average of multiple data points to obtain in time domain, when systematic parameter is constant,
Will not occur big change with the difference for sending signal, so the measurement of nonlinear noise absolute power is relatively reliable.
In optical fiber link and smaller receiver noise, with the error vector width between the signal received after signal and demodulation
Degree can obtain nonlinear phase shift and power, but when the spontaneous emission noise of fiber amplifier is excessive, this measuring method
It will be influenceed by spontaneous emission noise and become inaccurate.
Interchannel nonlinear noise e measurement technology is made an uproar in spontaneous radiation in above-mentioned existing division multiplex fibre-optic communication wave system
In the case of sound is larger, also there is significant improvement space in its measurement effect.The present invention is applied to wavelength-division multiplex (WDM) fiber optic communication system
The monitoring of interchannel nonlinear effect in system, the purpose is to be directed to solving believing in above-mentioned measurement division multiplex fibre-optic communication wave system
The technological deficiency that nonlinear noise is influenceed by spontaneous emission noise between road, proposes that one kind can resist spontaneous emission noise influence simultaneously
The apparatus and method of interchannel nonlinear effect in accurate measurement division multiplex fibre-optic communication wave system.
The content of the invention
It is an object of the invention to overcome interchannel nonlinear effect in existing measurement division multiplex fibre-optic communication wave system
Device and method measure inaccurate technological deficiency when spontaneous emission noise is excessive, it is proposed that one kind measurement WDM fiber communication
The apparatus and method of nonlinear effect between system channel.
The apparatus and method of nonlinear effect include one kind linear frequency modulation between a kind of measurement WDM fiber communication system channel
The device of interchannel nonlinear effect, the abbreviation present apparatus, and one kind line in signal measurement division multiplex fibre-optic communication wave system
Property FM signal measurement division multiplex fibre-optic communication wave system in interchannel nonlinear effect method.
Wherein, the present apparatus includes processing unit, obtains one complete frame structure of signal, takes out leading in linear FM signal
Frequently；First measuring unit, spontaneous emission noise performance number is measured in frequency domain；Second measuring unit, is measured spontaneous in fractional order domain
Radiated noise and interchannel nonlinear noise performance number；Computing unit, calculates the nonlinear noise performance number of interchannel.
A kind of method that interchannel nonlinear effect in division multiplex fibre-optic communication wave system is measured with linear FM signal, tool
Body is：
Step 1: adding pilot signal to channel to be measured in transmitting terminal；
Wherein, the pilot signal added to channel to be measured is linear FM signal, and the bandwidth of linear FM signal is small
The bandwidth shared by data-signal in channel bearing to be measured；Include pilot signal and carrying number after channel addition pilot signal to be measured
It is believed that number two parts, pilot signal before carry data signals, channel to be measured and division multiplex fibre-optic communication wave system its
After his channel (being referred to as interference channel) multiplex, transmitted by optical fiber link to receiving terminal；In transmitting procedure, interference channel is treated
Survey channel and produce interchannel nonlinear effect；
The present invention is not limited to the format modulation signal and frame structure of interference channel；
Step 2: processing unit receives channel signal to be measured, and extract pilot signal；
Wherein, pilot signal is time-domain signal, also referred to as time-domain pilot signal；
Step 3: pilot signal is transformed into frequency domain, the spontaneous emission noise power in channel to be measured is calculated；
Wherein, measurement spontaneous emission noise power frequency range be Linear Frequency Modulation signal bandwidth frequency range outside and
Within channel width frequency range to be measured；Spontaneous emission noise power utilization spontaneous emission noise in whole channel to be measured is in frequency
The property calculation that domain is evenly distributed；
Step 4: the pilot signal that step 2 is exported is transformed into fractional order through Optimal order Fourier Transform of Fractional Order
Domain, output fractional order domain signal；
Wherein, when the conversion order of Fourier Transform of Fractional Order is optimal, pilot signal can produce one in fractional order domain
Individual impulse, channel to be measured is after wave division multiplex transmission, because linear FM signal power is not changed over time, so in channel
The phase offset that nonlinear effect is brought is constant, and such intrachannel nonlinear effect will not be to the linear frequency modulation as pilot tone
The Energy distribution of signal is impacted；
Step 5: using the fractional order domain signal obtained in step 4, calculating the institute outside the impulse that fractional order domain is obtained
There is the power of signal, just obtain the power of spontaneous emission noise and interchannel nonlinear noise and abbreviation in whole channel to be measured
Power and；
Step 6: the power that step 5 is exported and the spontaneous emission noise work(in the channel to be measured for subtracting step 3 calculating
Rate obtains the watt level of interchannel nonlinear noise；
So far, from step one to step 6, complete and a kind of measure nonlinear effect between WDM fiber communication system channel
Method.
Beneficial effect
The apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel, with other measurement WDM fibers
The apparatus and method of nonlinear effect are compared between communication system channel, are had the advantages that：
1. the watt level of interchannel nonlinear noise changes over time very little, and present invention one kind utilizes linear frequency modulation letter
Number as interchannel nonlinear noise power in pilot measurement division multiplex fibre-optic communication wave system, it can more accurately characterize optical fiber and lead to
Believe the size of wavelength-division multiplex system nonlinear effect；
2. interchannel nonlinear noise watt level can be monitored by the present invention, so as to monitor system in real time
Interchannel nonlinear noise, and then can be by adjusting channel power, modulation format, interchannel to the influence degree of systematic function
Every etc. systematic parameter, reach the purpose of lifting system performance.
Brief description of the drawings
Fig. 1 is the apparatus and method of nonlinear effect and implementation between a kind of measurement WDM fiber communication system channel of the present invention
The measuring principle figure of example 1；
Fig. 2 is the dress in the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel of the present invention
Put and embodiment 1 in schematic device；
Fig. 3 is the apparatus and method of nonlinear effect and implementation between a kind of measurement WDM fiber communication system channel of the present invention
Example 2 realizes step；
Fig. 4 is the apparatus and method embodiment 3 of nonlinear effect between a kind of measurement WDM fiber communication system channel of the present invention
The measurement effect figure of middle interchannel non-linear power measurement；
(a) is channel signal to be measured in Fig. 1, and (b) is the frequency domain power distribution map of the linear FM signal as pilot tone,
(c) it is the fractional order domain power profile of the linear FM signal as pilot tone.
Embodiment
Embodiment 1
The present embodiment 1 describes channel in one kind linear FM signal measurement division multiplex fibre-optic communication wave system of the invention
Between nonlinear effect method measurement interchannel nonlinear effect principle and device composition and function.Fig. 1 is a kind of for the present invention
Measured in division multiplex fibre-optic communication wave system and surveyed in the method and the present embodiment 1 of interchannel nonlinear effect with linear FM signal
The principle of interchannel nonlinear effect is measured, wherein Fig. 1 (a) is constituted for the frame structure of channel signal to be measured, treated shown in such as Fig. 1 (a)
Surveying channel signal frame, (i.e. LFM in Fig. 1 (a) believes corresponding to the pilot tone in step one by the linear FM signal as pilot tone
Number) and carrying data (i.e. Payload in Fig. 1 (a), corresponding to the carry data signals in step one) composition.Fig. 1 (b) is
The frequency domain power distribution map of linear FM signal as pilot tone.In Fig. 1 (b), linear FM signal is in the center of frequency domain
Domain, and represented in figure with LFM；Interchannel nonlinear noise is being schemed near frequency domain distribution Linear Frequency Modulation signal pilot
It is middle to be represented with NL；Spontaneous emission noise is evenly distributed on whole frequency domain, and is represented in figure with ASE.Fig. 1 (c) is as pilot tone
Linear FM signal Optimal order fractional order domain power profile.In Fig. 1 (c), the power point of linear FM signal
Cloth is an impulse in Optimal order fractional order domain, and represented in figure with LFM；Interchannel nonlinear noise is made an uproar with spontaneous radiation
Sound is represented in dividing for Optimal order fractional order domain with ASE+NL.
Fig. 2 is channel in the present invention and the present embodiment one kind linear FM signal measurement division multiplex fibre-optic communication wave system
Between nonlinear effect device composition frame chart.As shown in Fig. 2 the device 200 includes：Processing unit 201, the first measuring unit
202nd, the second measuring unit 203 and computing unit 204.
The signal including nonlinear noise that 201 pairs of processing unit is received is handled, and complete frame is taken out in time domain,
LFM pilot signals are taken out in a complete frame, for doing subsequent treatment.
First measuring unit 202 measures the operation of ASE noise powers in frequency domain to LFM pilot signals.
It is non-with interchannel that second measuring unit 203 measures ASE noises to LFM pilot signals in Optimal order score field
The operation of line noise power sum.
The measurement result of the measuring unit 203 of 204 pair of first measuring unit of computing unit 202 and second is calculated, and is drawn
Interchannel non-linear power.
Embodiment 2
The present embodiment 2 describes the dress using nonlinear effect between a kind of measurement WDM fiber communication system channel of the present invention
Put and realize step with method wherein method, it is specific as shown in Figure 3.
Fig. 3 is the specific steps that interchannel nonlinear effect is measured using measurement apparatus in Fig. 2 200.Such as Fig. 3 institutes
Show, the present embodiment is specifically comprised the following steps：
Step 301, filtering, filter out channel to be measured；
Specific to the present embodiment, frequency domain is filtered, and demultiplexed channel to be measured, wherein filter bandwidht should be greater than carrying
The bandwidth of signal.
The present embodiment median filter bandwidth is set to 50GHz, and centre wavelength is 1550nm.
Wherein, channel signal to be measured includes pilot signal and carry data signals two parts, and pilot signal is in carrying data
Before signal, linear FM signal bandwidth is less than bandwidth shared by carry data signals；
The front portion of channel signal frame to be measured is linear FM signal (i.e. LFM in Fig. 1 (a), corresponding in step one
Pilot signal), rear portion for carrying data (i.e. Payload in Fig. 1 (a), corresponding in step one carrying data letter
Number).
It should be noted that to the pilot signal in step one and step 301 and carrying number in the present invention and the present embodiment
It is believed that a number proportion is not limited, i.e., there is pilot signal in channel to be measured, while also not limiting the length of frame structure.
Form of the pilot signal in a cycle in the present embodiment be：
Wherein, t is time variable, and x (t) is pilot signal, and exp is exponential function, and j is imaginary symbols,For initial phase
Position, f0Centered on frequency, k is chirp rate；By adjusting cycle and chirp rate, control LFM signal bandwidths can be reached
Purpose.
Pilot signal in the present embodimentAnd f0All it is set to 0, k and is set to 1.6911 × 1016Hz2Pilot signal is in a frame
In occupy preceding 1/8 duration.The data-signal of carrying is 16Quadrature Amplitude Modulation
(16QAM) signal, institute's carrying signal character rate is 28G Baud, 7/8 time span after the data of carrying are occupied in a frame.
The time span of a frame is 65536 carrying signal symbol periods in the present embodiment.
The present embodiment carries out wave division multiplex transmission using 9 channels, wherein the intermediate channels of 9 channels are channel to be measured,
Performance number for measuring interchannel nonlinear noise, other 8 channels are interference channel, for producing the non-linear effect of interchannel
Should.Adjacent channel centre frequency is at intervals of 50GHz in 9 channels, wherein the centre wavelength of channel to be measured is 1550nm.
The link of the present embodiment is the standard single-mode fiber of 10 spans, and wherein abbe number is set to 16ps/ (nm.km),
Attenuation coefficient is set to 0.2dB/km, and the fiber transmission attenuation that nonlinear fiber coefficient is set between 1.31/ (W.km), span makes
Compensated with erbium-doped fiber amplifier, erbium-doped fiber amplifier multiplication factor is 20dB, and not comprising spontaneous emission noise.At 10
Spontaneous emission noise is added after span transmission, the power of wherein spontaneous emission noise is determined by OSNR.
Step 302, time domain take out LFM pilot signals；
It is that processing unit takes out a complete frame in time domain specific to the present embodiment, and is taken out in this complete frame
The part of LFM pilot signals, is stored so as to subsequent treatment.
A frame length is 65536 symbol periods in the present embodiment, wherein preceding 1/8 frame is LFM pilot signals, analog-to-digital conversion
The sample rate of device is 56GSa/s.
Step 301 and step 302 are completed in processing unit 201.
Step 303, frequency domain measure ASE noises；
It is that pilot signal is transformed into frequency domain specific to the present embodiment, calculates the spontaneous emission noise work(in channel to be measured
Rate；
As shown in Fig. 1 (b), outside Linear Frequency Modulation signal bandwidth frequency range, within channel width frequency range to be measured
Spontaneous emission noise (ASE) is measured, equally distributed property is presented in frequency domain with ASE noises, is calculated in whole channel to be measured
The power of ASE noises.
Optical wdm transmission signal can be influenceed in optical fiber link transmission by non-linear (NL) effect, due to interchannel
Nonlinear effect is concentrated near LFM signal spectrums in frequency domain, is needed during measurement ASE away from LFM signals, shown in such as Fig. 1 (b),
Wherein linear FM signal is represented at the center of frequency domain, and in figure with LFM；Interchannel nonlinear noise is online in frequency domain distribution
Near property FM signal pilot tone, and represented in figure with NL；Spontaneous emission noise is used with being distributed in whole frequency domain, and in figure
ASE is represented.
The LFM signals of taking-up are transformed into outside frequency domain, Linear Frequency Modulation signal bandwidth frequency range from time domain, letter to be measured
ASE noise powers, this frequency range B are calculated within the scope of road bandwidth frequencyAMTo represent, B is surveyedAMIn the range of noise work(
Rate NAMTo represent, the bandwidth B of channel to be measuredChTo represent.The ASE noise powers P of so whole channel to be measuredASEFor
BChNAM/BAM。
B in the present embodimentAMFor 3GHz, BChFor 50GHz, different OSNR (Optical Signal Noise
Ratio different ASE noise powers) are correspond to, wherein the centre frequency and baseband frequency (0Hz) phase of measurement ASE noise powers
Poor 20GHz, finally according to BChNAM/BAMCalculating obtains PASE。
Step 303 is completed in the first measuring unit 202.
Interchannel nonlinear noise and ASE noise power sums are measured in step 304, Optimal order fractional order domain；
Specific to the present embodiment for time-domain pilot signal is transformed into fractional order domain through Fourier Transform of Fractional Order, calculate most
The power of all signals outside excellent order fractional order domain impulse and, just obtain the spontaneous emission noise and interchannel of channel to be measured
The power of nonlinear noise and, abbreviation power and；
Fig. 1 (c) is fractional order domain energy profile.Fractional order domain Optimal order can be obtained by following formula：
Wherein, T is the time span of FM signal, and arctan is arctan function, fsFor sample rate.
Total bandwidth can be obtained by the time span product of chirp slope k and FM signal.By ρoptRank converts
Linear FM signal occurs energy centralization and produces spike afterwards, and shown in such as Fig. 1 (c), in Fig. 1 (c), linear FM signal is led
Frequency is concentrated on an impulse in fractional order domain, and is represented in figure with LFM；Interchannel nonlinear noise and spontaneous emission noise
Whole fractional order domain is distributed in, and is represented in figure with ASE+NL.
Because LFM signal powers are constant, so produced nonlinear phase skew is constant to LFM signals in itself, so
Nonlinear effect in LFM channels will not be impacted to the Energy distribution of signal.The nonlinear effect of interchannel is by optical fiber
The random signal influence of interior interference channel, can produce noise, this noise is almost overlapped on frequency domain with LFM signals, be difficult to differentiate,
And in fractional order domain, interchannel nonlinear effect can be disturbed, no longer it is gathered in around useful signal, so calculates outside impulse
All signals power, the performance number measured include ASE noise powers and interchannel nonlinear noise power.
The LFM signals of taking-up are transformed into fractional order domain by step 304 from time domain, and conversion exponent number is obtained with formula (2).Dividing
The signal at peak value is ignored in number rank domain, calculates the power of remaining all signals.The power tried to achieve is interchannel nonlinear noise
With the power of ASE noises and, be set to PTotal。
ρ in the present embodimentoptFor 1.0561, signal is carried out after 1.0561 rank Fourier Transform of Fractional Order, removed at peak value
Signaling point, calculate remaining all signal powers, obtain PTotal。
Step 304 is completed in the second measuring unit 203.
Step 305, calculate interchannel nonlinear effect；
The watt level of interchannel nonlinear noise is obtained for calculating specific to the present embodiment.
The P that step 304 is tried to achieveTotalSubtract the P that step 303 is tried to achieveASE, obtained performance number is that interchannel is non-linear
The performance number of noise.Step 305 is completed in computing unit 204.
Embodiment 3
The present embodiment 3 is described carries one kind linear FM signal measurement division multiplex fibre-optic communication wave system using the present invention
The method of interchannel nonlinear effect simulates the result of 9 channels respectively in system.It is subdivided into two kinds of situations, i.e., 9 channels
Total transmit power be respectively 8dBm and 10dBm.The scope of OSNR is 12-27dB in the case of two kinds.
The actual value of interchannel nonlinear noise power is calculated first.The actual value of interchannel nonlinear noise power is equal to
The actual value of total nonlinear noise power subtracts the actual value of intrachannel nonlinear noise power.
The actual value acquisition modes of wherein total nonlinear noise power are：It is 1.31/ that first emulation, which obtains nonlinear factor,
(W.km) 9 channels carry out the signal after wave division multiplex transmissions when, then emulate obtain nonlinear factor for 0 when 9 channels carry out
Signal after wave division multiplex transmission, by the two input Wiener filter, filters out noise, calculates noise power-value, this performance number
The actual value of as total nonlinear noise power；The tap coefficient of wherein Wiener filter is set to 21.
The actual value acquisition modes of wherein intrachannel nonlinear noise power are：First emulation obtains nonlinear factor and is
Signal of 1 channel after transmission when 1.31/ (W.km), then emulate obtain nonlinear factor for 0 when 1 channel by transmission
Signal afterwards, by the two input Wiener filter, filters out noise, calculates noise power-value, this performance number is non-in channel
The actual value of line noise power；The tap coefficient of wherein Wiener filter is set to 21.
Then the survey using the interchannel nonlinear noise power obtained by method and apparatus proposed by the invention is calculated
Value, its obtaining step is identical with the step in embodiment 2.
When calculating the actual value and measured value of interchannel nonlinear noise power, NM system in the present embodiment 3
Parameter is identical with the systematic parameter in embodiment 2.
The measured value and the deviation of actual value of interchannel nonlinear noise power under different transmit powers and OSNR
As shown in figure 4, wherein the deviation (in units of dB) of measured value and actual value is the measured value of interchannel nonlinear noise power
(in units of dBm) subtracts the actual value of interchannel nonlinear noise power (in units of dBm).
OSNR (Optical Signal Noise Ratio) represents that solid circles correspondence is total with OSNR in Fig. 4
The interchannel nonlinear noise power deviation that transmit power is measured when being 10dBm；The total transmit power of triangle line correspondence is 8dBm
Situation.The measured deviation of interchannel nonlinear noise power is always less than 0.5dB, illustrates the channel of the present invention and this example 3
Between nonlinear noise power measurement deviation very little, interchannel nonlinear noise power can be accurately measured.
Described above is presently preferred embodiments of the present invention, and the present invention should not be limited to the embodiment and accompanying drawing institute is public
The content opened.It is every not depart from the lower equivalent or modification completed of spirit disclosed in this invention, both fall within the model that the present invention is protected
Enclose.
Claims (6)
1. the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel, it is characterised in that：Including one kind
With linear FM signal measure division multiplex fibre-optic communication wave system in interchannel nonlinear effect device, the abbreviation present apparatus, with
And a kind of method that interchannel nonlinear effect in division multiplex fibre-optic communication wave system is measured with linear FM signal；
Wherein, the present apparatus includes processing unit, obtains one complete frame structure of signal, takes out the pilot tone in linear FM signal；
First measuring unit, spontaneous emission noise performance number is measured in frequency domain；Second measuring unit, spontaneous radiation is measured in fractional order domain
Noise and interchannel nonlinear noise performance number；Computing unit, calculates the nonlinear noise performance number of interchannel；
A kind of method that interchannel nonlinear effect in division multiplex fibre-optic communication wave system is measured with linear FM signal, specifically
For：
Step 1: adding pilot signal to channel to be measured in transmitting terminal；
Step 2: processing unit receives channel signal to be measured, and extract pilot signal；
Step 3: pilot signal is transformed into frequency domain, the spontaneous emission noise power in channel to be measured is calculated；
Step 4: the pilot signal that step 2 is exported is transformed into fractional order domain through Optimal order Fourier Transform of Fractional Order, it is defeated
Go out fractional order domain signal；
Step 5: using the fractional order domain signal obtained in step 4, calculating all letters outside the impulse that fractional order domain is obtained
Number power, just obtain in whole channel to be measured the power of spontaneous emission noise and interchannel nonlinear noise and, abbreviation power
With；
Step 6: the power that step 5 is exported and the spontaneous emission noise power subtracted in the channel to be measured that step 3 is calculated are obtained
To the watt level of interchannel nonlinear noise；
So far, from step one to step 6, a kind of side of nonlinear effect between measurement WDM fiber communication system channel is completed
Method.
2. the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel according to claim 1,
It is characterized in that：It is linear FM signal to the pilot signal that channel to be measured is added in step one, and linear FM signal
Bandwidth is less than the bandwidth shared by the data-signal of channel bearing to be measured；Include after channel to be measured addition pilot signal pilot signal and
Carry data signals two parts, pilot signal is before carry data signals, channel to be measured and division multiplex fibre-optic communication wave system
After other channel (being referred to as interference channel) multiplex of system, transmitted by optical fiber link to receiving terminal；In transmitting procedure, interference letter
Road produces interchannel nonlinear effect to channel to be measured.
3. the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel according to claim 1,
It is characterized in that：The format modulation signal and frame structure of interference channel are not limited.
4. the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel according to claim 1,
It is characterized in that：In step 2, pilot signal is time-domain signal, also referred to as time-domain pilot signal.
5. the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel according to claim 1,
It is characterized in that：In step 3, the frequency range of measurement spontaneous emission noise power is Linear Frequency Modulation signal bandwidth frequency model
Outside enclosing and within channel width frequency range to be measured；Spontaneous emission noise power utilization spontaneous radiation in whole channel to be measured
The property calculation that noise is evenly distributed in frequency domain.
6. the apparatus and method of nonlinear effect between a kind of measurement WDM fiber communication system channel according to claim 1,
It is characterized in that：In step 4, when the conversion order of Fourier Transform of Fractional Order is optimal, pilot signal is in the meeting of fractional order domain
An impulse is produced, channel to be measured is after wave division multiplex transmission, because linear FM signal power is not changed over time, so
The phase offset that intrachannel nonlinear effect is brought is constant, and such intrachannel nonlinear effect will not be to the line as pilot tone
The Energy distribution of property FM signal is impacted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710094483.XA CN107147440B (en) | 2017-02-22 | 2017-02-22 | It is a kind of measurement WDM fiber communication system channel between nonlinear effect device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710094483.XA CN107147440B (en) | 2017-02-22 | 2017-02-22 | It is a kind of measurement WDM fiber communication system channel between nonlinear effect device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107147440A true CN107147440A (en) | 2017-09-08 |
| CN107147440B CN107147440B (en) | 2019-09-24 |
Family
ID=59783353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710094483.XA Active CN107147440B (en) | 2017-02-22 | 2017-02-22 | It is a kind of measurement WDM fiber communication system channel between nonlinear effect device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107147440B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462435A (en) * | 2018-12-25 | 2019-03-12 | 武汉邮电科学研究院有限公司 | Nonlinear effect analysis model and method in a kind of system of optical fiber telecommunications system |
| CN112585890A (en) * | 2018-10-05 | 2021-03-30 | 华为技术有限公司 | Monitoring performance of an optical network using low power gaps and pilot tones |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1720680A (en) * | 2002-12-16 | 2006-01-11 | 特瑞林克通讯有限公司 | OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method |
| CN102420661A (en) * | 2011-12-15 | 2012-04-18 | 华中科技大学 | Device for compensating non-linear damage of optical fiber |
| CN102901954A (en) * | 2012-09-04 | 2013-01-30 | 天津职业技术师范大学 | Non-linear software correction method of linear frequency modulated continuous wave radar |
| CN103634049A (en) * | 2012-08-20 | 2014-03-12 | 希尔纳公司 | Systems and methods for the compensation of dual polarization coherent channels |
| EP2945301A1 (en) * | 2014-05-16 | 2015-11-18 | Fujitsu Limited | Measurement apparatus and method of measuring signal light quality |
| CN106301417A (en) * | 2016-11-01 | 2017-01-04 | 北京理工大学 | A kind of passive intermodulation interference cancellation method based on sparse fraction rank Fourier transform |
-
2017
- 2017-02-22 CN CN201710094483.XA patent/CN107147440B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1720680A (en) * | 2002-12-16 | 2006-01-11 | 特瑞林克通讯有限公司 | OSNR monitoring method and apparatus using tunable optical bandpass filter and polarization nulling method |
| CN102420661A (en) * | 2011-12-15 | 2012-04-18 | 华中科技大学 | Device for compensating non-linear damage of optical fiber |
| CN103634049A (en) * | 2012-08-20 | 2014-03-12 | 希尔纳公司 | Systems and methods for the compensation of dual polarization coherent channels |
| CN102901954A (en) * | 2012-09-04 | 2013-01-30 | 天津职业技术师范大学 | Non-linear software correction method of linear frequency modulated continuous wave radar |
| EP2945301A1 (en) * | 2014-05-16 | 2015-11-18 | Fujitsu Limited | Measurement apparatus and method of measuring signal light quality |
| CN106301417A (en) * | 2016-11-01 | 2017-01-04 | 北京理工大学 | A kind of passive intermodulation interference cancellation method based on sparse fraction rank Fourier transform |
Non-Patent Citations (1)
| Title |
|---|
| 朱小流等: "Chirp导频信号捕获方法研究", 《通信与广播电视》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112585890A (en) * | 2018-10-05 | 2021-03-30 | 华为技术有限公司 | Monitoring performance of an optical network using low power gaps and pilot tones |
| CN112585890B (en) * | 2018-10-05 | 2022-04-05 | 华为技术有限公司 | Monitoring performance of an optical network using low power gaps and pilot tones |
| CN109462435A (en) * | 2018-12-25 | 2019-03-12 | 武汉邮电科学研究院有限公司 | Nonlinear effect analysis model and method in a kind of system of optical fiber telecommunications system |
| CN109462435B (en) * | 2018-12-25 | 2020-06-09 | 武汉邮电科学研究院有限公司 | Nonlinear effect analysis model and method in system of optical fiber communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107147440B (en) | 2019-09-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3391800B2 (en) | Method and apparatus for measuring strain in optical transmission system | |
| CN102859957B (en) | For the method and apparatus that nonlinear fiber alleviates | |
| CN107147440B (en) | It is a kind of measurement WDM fiber communication system channel between nonlinear effect device and method | |
| Jain et al. | Performance Analysis of the Two-Channel WDMRoF System For Various Attenuation Levels | |
| Neto et al. | On the interest of chirped lasers for AMOOFDM transmissions in long distance PON networks | |
| Song et al. | A discrete-time polynomial model of single channel long-haul fiber-optic communication systems | |
| Xiang et al. | A joint OSNR and nonlinear distortions estimation method for optical fiber transmission system | |
| Li et al. | Digital code-division multiplexing channel aggregation for mobile fronthaul architecture with low complexity | |
| Kamalian et al. | Spectral efficiency estimation in periodic nonlinear Fourier transform based communication systems | |
| Sinkin et al. | Effective signal to noise ratio performance metric for dispersion-uncompensated links | |
| CN104618295A (en) | Flexible bandwidth allocation based orthogonal frequency-division multiplexing passive optical network | |
| Cano et al. | Optimum carrier to signal power ratio for remote heterodyne DD-OFDM in PONs | |
| CN105281828A (en) | Transmission performance assessment method and apparatus in coherent transmission system | |
| CN104993866B (en) | A kind of monitoring method and device of optical signal to noise ratio | |
| Ghafoor et al. | Reduced dispersion duplex DQPSK radio-over-fiber communications using single-laser-based multiple side-bands | |
| Uzunidis et al. | Comparison of simplified FWM expressions for coherent optical systems in both dispersion managed and un-managed fiber links | |
| Soerensen | Optical beat noise suppression and power equalization in subcarrier multiple access passive optical networks by downstream feedback | |
| Kim et al. | The efficient clock-extraction methods of NRZ signal for chromatic dispersion monitoring | |
| Gupta et al. | Investigation of long-haul optical transmission systems: diverse chirped FBGs with DCF for 300km length of SMF | |
| Shapiro et al. | Optimization of the capacity of a fiber communication line with nonlinear memory | |
| Yousif et al. | Performance Evaluation of Dispersion Compensation Fiber-based Coherent Optical OFDM-WDM for Long Haul RoF | |
| Pavan et al. | Integration of visible light communication and fiber communication system | |
| US11777612B2 (en) | Method for nonlinear compensation of coherent high-capacity high-order qam system | |
| Xianjie et al. | CO-OFDM Technology Long Distance Transmission System | |
| Dischler et al. | Experimental investigation of non-linear threshold of 113Gb/s O-OFDM signals on DCF free transmission links |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |