CN107276668B - A kind of polarization mode dispersion monitoring method, device, electronic equipment and storage medium - Google Patents
A kind of polarization mode dispersion monitoring method, device, electronic equipment and storage medium Download PDFInfo
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- CN107276668B CN107276668B CN201710437923.7A CN201710437923A CN107276668B CN 107276668 B CN107276668 B CN 107276668B CN 201710437923 A CN201710437923 A CN 201710437923A CN 107276668 B CN107276668 B CN 107276668B
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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
- H04B10/07951—Monitoring or measuring chromatic dispersion or PMD
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
Abstract
The embodiment of the invention provides a kind of polarization mode dispersion monitoring method, device, electronic equipment and storage mediums, receiving end applied to optical fiber telecommunications system, the described method includes: when the receiving end of optical fiber telecommunications system receives echo signal light, according to the frequency of echo signal light, the pump signal light and auxiliary signal light of narrow bandwidth, low-power consumption are generated；Then pump signal light is coupled with auxiliary signal light, obtains detectable signal light；Utilize echo signal light and detectable signal photogenerated idler light；By calculating the target power difference of the power of echo signal light and the power of idler light, to obtain the polarization mode dispersion value of wireless optical fiber telecommunications system.The utilization rate and practicability of optical fiber telecommunications system are not only increased, and improve the monitoring sensitivity and accuracy of polarization mode dispersion under the premise of effectively monitoring polarization mode dispersion by this programme.
Description
Technical field
The present invention relates to fields of communication technology, more particularly to a kind of polarization mode dispersion monitoring method, device, electronic equipment
And storage medium.
Background technique
With the continuous improvement of optical fiber telecommunications system transmission rate and optical signal transmission range in fiber optic communication systems
Continuous promotion, fibre-optical dispersion (CD), optical signal to noise ratio (OSNR), polarizing coating dispersion (PMD) are to the transmission matter of optical fiber telecommunications system
Amount has large effect.
In the prior art, the monitoring scheme of fibre-optical dispersion (CD) and optical signal to noise ratio (OSNR) is more perfect, but
Polarizing coating dispersion (PMD) monitoring aspect is perfect not enough, is primarily present following disadvantage: the first, needing the transmitting terminal in optical signal
Increase equipment, reduces the practicability of optical fiber telecommunications system；Or need insertion monitoring light, drop during optical signal transmission
The low availability of frequency spectrum of optical fiber telecommunications system；The second, usually using the nonlinear effect of signal light to be monitored come to polarization mode
Dispersion is monitored.Wherein, a kind of mode be monitored using the characteristic of signal light to be monitored itself, for example, using to
The Self-phase modulation nonlinear effect of monitoring signals light is monitored；Another way is believed using signal light to be monitored and pumping
The nonlinear effect that number light generates is monitored.All there is monitoring sensitivity and accurate in modes of both monitoring polarization mode dispersions
Spend lower disadvantage.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of polarization mode dispersion monitoring method, device, electronic equipment and storage
Medium, to improve the utilization rate and practicability and polarization mode of optical fiber telecommunications system under the premise of effectively monitoring polarization mode dispersion
The monitoring sensitivity and accuracy of dispersion.Specific technical solution is as follows:
In a first aspect, being applied to optical fiber telecommunications system the embodiment of the invention provides a kind of polarization mode dispersion monitoring method
Receiving end, which comprises
When the receiving end of the optical fiber telecommunications system receives signal light to be monitored, filter out in the signal light to be monitored
Echo signal light；Wherein, the noise of the echo signal light is lower than predetermined threshold；
According to the frequency of the echo signal light, pump signal light and auxiliary signal light are generated, wherein the pump signal
Light and the auxiliary signal light are the signal light of narrow bandwidth, low-power；
The pump signal light is coupled with the auxiliary signal light, obtains detectable signal light；
The signal light that the echo signal light and the detectable signal light are coupled, and coupling is obtained injects Gao Fei
In linear optical fiber, idler light is generated；
The echo signal light and the idler light are filtered out, and calculates the power of the echo signal light filtered out and filters out
Idler light power target power difference；
According to the target power difference, the polarization mode dispersion value of the optical fiber telecommunications system is obtained.
Optionally, it is described the echo signal light and the detectable signal light are coupled before, the method is also
Include:
Judge whether the performance number of the echo signal light is less than predetermined power value；
If it is, the performance number of the echo signal light is amplified to the predetermined power value.
Optionally, it is described the echo signal light and the detectable signal light are coupled before, the method is also
It include: by the power-sharing of the echo signal light and the detectable signal light to X-axis and Y-axis.
Optionally, the frequency according to the echo signal light generates the step of pump signal light and auxiliary signal light,
Include:
According to the frequency of the echo signal light, the first frequency of pump signal light is determined；
Generate the pump signal light that frequency size is the first frequency；
The frequency of idler light is calculated according to the first frequency of the frequency of the echo signal light and the pump signal light
Rate；
According to the frequency of the first frequency of the pump signal light and the idler light, the of auxiliary signal light is determined
Two frequencies；
Generate the auxiliary signal light that frequency size is the second frequency.
Optionally, described according to the target power difference, obtain the polarization mode dispersion value of the optical fiber telecommunications system
Step, comprising:
From preset power difference and the graph of relation of polarization mode dispersion value, it is corresponding to search the target power difference
Polarization mode dispersion value, the polarization mode dispersion value found is determined as to the polarization mode dispersion value of the optical fiber telecommunications system；
Alternatively,
The target power difference is substituted into the functional relation expression formula of preset power difference and polarization mode dispersion value,
Calculated result is obtained, obtained calculated result is determined as the corresponding polarization mode dispersion value of the optical fiber telecommunications system.
Second aspect, the embodiment of the invention also provides a kind of polarization mode dispersion monitoring devices, are applied to fiber optic communication system
The receiving end of system, described device include:
Echo signal light filters out module, for receiving signal light to be monitored in the receiving end of the optical fiber telecommunications system
When, filter out echo signal light in the signal light to be monitored；Wherein, the noise of the echo signal light is lower than predetermined threshold；
Pump signal light and auxiliary signal photogenerated module generate pumping for the frequency according to the echo signal light
Signal light and auxiliary signal light, wherein the pump signal light and the auxiliary signal light are the signal of narrow bandwidth, low-power
Light；
Detectable signal photogenerated module is obtained for coupling the pump signal light with the auxiliary signal light
Detectable signal light；
Idler photogenerated module, for the echo signal light and the detectable signal light to be coupled, and will
It couples in obtained signal light injection highly nonlinear optical fiber, generates idler light；
Target power difference calculating module for filtering out the echo signal light and the idler light, and calculates filter
The target power difference of the power of the power of echo signal light out and the idler light filtered out；
Polarization mode dispersion value determining module, for obtaining the optical fiber telecommunications system according to the target power difference
Polarization mode dispersion value.
Optionally, described device further include:
Judgment module, for judging the mesh before being coupled the echo signal light and the detectable signal light
Whether the performance number of mark signal light is less than predetermined power value；
Power amplifier module, if the performance number for echo signal light is less than predetermined power value, by the echo signal light
Performance number be amplified to the predetermined power value.
Optionally, described device further include:
Power-sharing module, for it is described the echo signal light and the detectable signal light are coupled before,
By the power-sharing of the echo signal light and the detectable signal light to X-axis and Y-axis.
Optionally, the pump signal light and auxiliary signal photogenerated module, are specifically used for:
According to the frequency of the echo signal light, the first frequency of pump signal light is determined；
Generate the pump signal light that frequency size is the first frequency；
The frequency of idler light is calculated according to the first frequency of the frequency of the echo signal light and the pump signal light
Rate；
According to the frequency of the first frequency of the pump signal light and the idler light, the of auxiliary signal light is determined
Two frequencies；
Generate the auxiliary signal light that frequency size is the second frequency.
Optionally, the polarization mode dispersion value determining module, is specifically used for:
From preset power difference and the graph of relation of polarization mode dispersion value, it is corresponding to search the target power difference
Polarization mode dispersion value, the polarization mode dispersion value found is determined as to the polarization mode dispersion value of the optical fiber telecommunications system；
Alternatively,
The target power difference is substituted into the functional relation expression formula of preset power difference and polarization mode dispersion value,
Calculated result is obtained, obtained calculated result is determined as the corresponding polarization mode dispersion value of the optical fiber telecommunications system.
The third aspect, the embodiment of the invention also provides a kind of electronic equipment, the electronic equipment is optical fiber telecommunications system
Receiving end, including processor, communication interface, memory and communication bus, wherein processor, communication interface, memory pass through
Bus completes mutual communication,
Memory, for storing computer program；
Processor, when for executing the program stored on memory, so that electronic equipment executes above-mentioned first aspect institute
The either polarization mode dispersion monitoring method stated.
Fourth aspect, it is described computer-readable to deposit the embodiment of the invention also provides a kind of computer readable storage medium
Computer program is stored in storage media, when the computer program is executed by processor, so that electronic equipment executes above-mentioned the
Either polarization mode dispersion monitoring method described in one side.
Compared with prior art, the technical solution of the embodiment of the present invention, monitoring device is simple, and installation cost is lower；Target
Signal light does not need insertion monitoring light during optical fiber telecommunications system is transmitted, therefore frequency spectrum resource utilization rate is high.
Moreover, this programme will after the obtained echo signal light of coupling and detectable signal light is injected into highly nonlinear optical fiber,
Pump signal light in echo signal light and detectable signal light generates four-wave mixing effect in highly nonlinear optical fiber, generates ideler frequency
Signal light, wherein four-wave mixing effect is that the power of echo signal light is transferred to idler light.Since echo signal light exists
It during being transmitted in optical fiber telecommunications system, is influenced by polarization mode dispersion, the pulse broadening of echo signal light, peak power
Reduce, so that four-wave mixing effect weakens, and the auxiliary signal light in detectable signal light can be imitated further in weak four-wave mixing
It answers, so that the power that the power of echo signal light is transferred to idler light is less, i.e. the remaining performance number of echo signal light increases
Greatly, idler optical power value reduction, is calculated by difference, available echo signal optical power and idler optical power
Target power difference.And become with polarization mode dispersion variation tendency or idler light with polarization mode dispersion with echo signal light
Change trend is compared, and resulting target power difference is more obvious with the variation tendency of polarization mode dispersion, to improve polarization mode
The monitoring sensitivity and accuracy of dispersion.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of flow diagram of polarization mode dispersion monitoring method provided by the embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of polarization mode dispersion monitoring device provided by the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of a kind of electronic equipment provided by the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order under the premise of effectively can monitor polarization mode dispersion, improve the utilization rate of optical fiber telecommunications system and practical
Property, the embodiment of the invention provides a kind of polarization mode dispersion monitoring method, device, electronic equipment and storage mediums.
It should be noted that a kind of polarization mode dispersion monitoring method provided in an embodiment of the present invention and device, are applied to light
The receiving end of fiber communication system, with the polarization mode dispersion for effectively monitoring optical fiber telecommunications system.
A kind of polarization mode dispersion monitoring method is provided for the embodiments of the invention first below to be introduced.
As shown in Figure 1, a kind of polarization mode dispersion monitoring method provided by the embodiment of the present invention, may include walking as follows
It is rapid:
S110 is filtered out in signal light to be monitored when the receiving end of optical fiber telecommunications system receives signal light to be monitored
Echo signal light；Wherein, the noise of the echo signal light is lower than predetermined threshold；
It will be appreciated by persons skilled in the art that will receive during signal light transmits in fiber optic communication systems
The influence of noise, therefore, when optical fiber telecommunications system receives signal light to be monitored, in order to reduce noise to the shadow of subsequent step
It rings, can carry out filtering processing of making an uproar by filter, filter out the frequency range where signal light to be monitored, and filter out the interference of other frequency ranges
Noise, to obtain the echo signal light that noise is lower than predetermined threshold.
It should be noted that due to noise be it is random, have uncertainty, therefore, predetermined threshold also has uncertain
Property, predetermined threshold is related with the centre frequency of filter and bandwidth, and the centre frequency and bandwidth of filter are according to obtained target
Signal light frequency and bandwidth determine.Wherein, the centre frequency of filter is set as the centre frequency of echo signal light；Filter
Bandwidth can be greater than echo signal light bandwidth, might be less that the bandwidth of echo signal light, wherein the bandwidth of filter with
The ratio between echo signal bandwidth is all that reasonably, the embodiment of the present invention is not specifically limited bandwidth setting between 0.5 to 2.
S120 generates pump signal light and auxiliary signal light, wherein pump signal light according to the frequency of echo signal light
It is the signal light of narrow bandwidth, low-power with auxiliary signal light；
After obtaining echo signal light, according to the frequency of echo signal light, signal light is emitted by continuous-wave laser, is come
Generate the pump signal light and auxiliary signal light of narrow bandwidth, low-power.
It should be noted that being generated since pump signal light and auxiliary signal light are emitted by continuous-wave laser, this hair
The bandwidth of pump signal light and auxiliary signal light that bright embodiment generates is tens megahertzs, power can arrive 3dBm for -3dBm
Between, the embodiment of the present invention does not make specific limit to bandwidth and power value.
It is understood that the optical signal quality that the continuous-wave laser transmitting of different performance generates is different, and it is existing
Continuous-wave laser in technology could be used in the embodiment of the present invention substantially, to generate the pumping letter in the embodiment of the present invention
Number light and auxiliary signal light.
Optionally, the frequency according to the echo signal light generates the step of pump signal light and auxiliary signal light,
Include:
According to the frequency of the echo signal light, the first frequency of pump signal light is determined；
Generate the pump signal light that frequency size is the first frequency；
The frequency of idler light is calculated according to the first frequency of the frequency of the echo signal light and the pump signal light
Rate；
According to the frequency of the first frequency of the pump signal light and the idler light, the of auxiliary signal light is determined
Two frequencies；
Generate the auxiliary signal light that frequency size is the second frequency.
Specifically, adjusting the tranmitting frequency of continuous-wave laser first, and continuous-wave laser transmitting signal light is set
Bandwidth, to generate the pump signal light that frequency size is the first frequency.
It should be noted that tranmitting frequency is determined according to the frequency of echo signal light, continuous-wave laser emits signal light
Bandwidth be tens megahertzs be reasonable.Specifically, believing by adjusting continuous-wave laser tranmitting frequency to control pumping
The first frequency of number light is less than the frequency of echo signal light, and the frequency of echo signal light and first frequency are made poor, obtained difference
Value is reasonable in several hundred girz.That is, the wavelength of pump signal light is greater than the wavelength of echo signal light, will pump
It is poor that the wavelength of Pu signal light and the wavelength of echo signal light are made, and it is reasonable, present invention implementation that obtained difference, which is several nanometers,
Example is not especially limited this.
After generating pump signal light, according to the frequency of the frequency of echo signal light and pump signal light, it can calculate
The frequency of idler light out, the frequency of the idler light be equal to pump signal light frequency two times subtract echo signal light
Frequency.Wherein, which can be generated by echo signal light and pump signal light by four-wave mixing effect, for side
Case describes clear, will describe in detail subsequent.After the frequency for calculating idler light, according to idler light
The frequency of frequency and pump signal light, so that it may determine that the frequency of auxiliary signal light, the frequency of auxiliary signal light are idler
The median of light frequency and pump signal light frequency, the i.e. frequency of auxiliary signal light are idler light frequency and pump signal light
The half of the sum of frequency.
Pump signal light is coupled with auxiliary signal light, obtains detectable signal light by S130；
After generating pump signal light and auxiliary signal light, by photo-coupler by narrow bandwidth, the pump light of weak power
It is coupled with fill-in light, to obtain detectable signal light.It lays a good foundation effectively to monitor polarization mode dispersion.It needs to illustrate
It is that the photo-coupler can be 2 × 1 photo-couplers, it is of course also possible to be the coupler of other models, the embodiment of the present invention pair
This is not especially limited.
S140 couples the echo signal light and the detectable signal light, and the signal light that coupling is obtained is infused
Enter in highly nonlinear optical fiber, generates idler light；
Optionally, described to utilize the echo signal light and the detectable signal light, generate the step of idler light, packet
It includes:
The echo signal light and the detectable signal light are coupled；
In the signal light injection highly nonlinear optical fiber that coupling is obtained, idler light is obtained.
After obtaining detectable signal light, echo signal light is coupled with detectable signal light by coupler, is obtained
Signal light after coupling injects the signal light after the coupling in highly nonlinear optical fiber, in highly nonlinear optical fiber, detectable signal
Pump signal light in light, which can generate four-wave mixing effect with echo signal light, can generate two after four-wave mixing effect
A new signal light, in the two new signal lights, with echo signal light in conjugate relation signal light be idler light.
Moreover, because not only there is pump signal light in detectable signal light, there are also auxiliary signal light, and the auxiliary signal light is in high non-linearity light
In fibre, four-wave mixing effect can occur with pump signal light, ideler frequency light, generate the new signal light of two-way, wherein with pump signal
The signal light that light four-wave mixing obtains will generate another way new signal light with the echo signal light four-wave mixing, i.e., pass through at this time
Four-wave mixing effect generates multiple signals light, in this process, will increase idler optical power value with polarization mode dispersion
Value increases and reduced trend；Accordingly, due to the addition of fill-in light, it is also exaggerated remaining echo signal light function after four-wave mixing
Rate value increases with polarization mode dispersion value and the trend of increase.Therefore, by the function of the performance number of echo signal light and idler light
The target power difference that rate value is made to obtain after difference is amplified, and to a certain extent, increases target power difference with polarization mode
The variation tendency of dispersion, to be conducive to improve the monitoring sensitivity and accuracy of polarization mode dispersion.
Optionally, it is described the echo signal light and the detectable signal light are coupled before, the method is also
May include:
Judge whether the performance number of the echo signal light is less than predetermined power value；
If it is, the performance number of the echo signal light is amplified to the predetermined power value.
If the performance number for the echo signal light that optical fiber telecommunications system receiving end receives is too small, detectable signal light and target
The four-wave mixing effect that signal light generates in highly nonlinear optical fiber will be very faint, be unfavorable for the generation of idler light, thus
The sensitivity that will cause monitoring polarization mode dispersion can be declined with accuracy, therefore, by detectable signal light and echo signal
Light injects before highly nonlinear optical fiber, it can be determined that whether the performance number of echo signal light reaches predetermined power value, usual situation
Under, which is 15dBm.If the performance number that judging result is echo signal light is less than predetermined power value, can pass through
Amplifier amplifies echo signal light, that is to say, that so that the performance number of echo signal light is more than or equal to predetermined power value,
So that detectable signal light and echo signal light generate apparent four-wave mixing effect in highly nonlinear optical fiber, to improve
Monitor the sensitivity and accuracy of polarization mode dispersion.
Optionally, it is described the echo signal light and the detectable signal light are coupled before, the method is also
May include:
By the power-sharing of the echo signal light and the detectable signal light to X-axis and Y-axis.
It is imitated to make detectable signal light and echo signal light generate more obvious four-wave mixing in highly nonlinear optical fiber
It answers, the power of echo signal light and detectable signal light can also be made by polarizer by adjusting the polarization angle of polarizer
Echo signal light power and detectable signal light power-sharing to X-axis and Y-axis, with reduce because X-direction signal-to-noise ratio too
Big or Y direction signal-to-noise ratio is too big and generates large effect to four-wave mixing effect.In this way when detectable signal light and mesh
During mark signal light is propagated in highly nonlinear optical fiber, can it be produced in the signal light that X-axis and Y-axis both direction are transmitted
Raw corresponding, the mixing comparable four-wave mixing effect of degree.
S150, filters out echo signal light and idler light, and calculates the power of the echo signal light filtered out and filter out
The target power difference of the power of idler light；Signal light after four-wave mixing effect includes detectable signal light, target
Signal light and newly-generated idler light.In fiber optic communication systems due to signal light to be monitored, by polarization mode dispersion
Influence, the pulse broadening of signal light to be monitored, the peak value of signal light to be monitored reduces, and therefore, signal light to be monitored is through filtering
The peak value for the echo signal light that device filters out also reduces, so that echo signal shadow rings four-wave mixing effect.
Specifically, during highly nonlinear optical fiber transmits, can decay echo signal light four-wave mixing effect, and visit
The auxiliary signal light surveyed in signal light can further weak four-wave mixing effect.It should be noted that four-wave mixing effect be by
The power of echo signal light is transferred to idler light.Since four-wave mixing effect is decayed, the power of echo signal light turns
The power for moving to idler light is less, i.e. the remaining performance number of echo signal light increases, and idler optical power value is reduced,
By filtering out echo signal light and idler light, and calculate the mesh of the power of echo signal light and the power of idler light
Mark power difference.And become with polarization mode dispersion variation tendency or idler light with polarization mode dispersion variation with echo signal light
Gesture is compared, and resulting target power difference is more obvious with the variation tendency of polarization mode dispersion, so as to improve polarization mode color
Scattered monitoring sensitivity and accuracy.
For example, echo signal light and the spare time in the signal light after four-wave mixing effect are filtered out with bandpass filter
Frequency signal light, and the power of echo signal light Yu idler light is measured with light power meter respectively, the mesh for then obtaining measurement
It is poor that the power of the power and idler light of marking signal light is made, and obtained difference is target power difference.
S160 obtains the polarization mode dispersion value of optical fiber telecommunications system according to target power difference.
Optionally, described according to the target power difference, obtain the polarization mode dispersion value of the optical fiber telecommunications system
Step, comprising:
From preset power difference and the graph of relation of polarization mode dispersion value, it is corresponding to search the target power difference
Polarization mode dispersion value, the polarization mode dispersion value found is determined as to the polarization mode dispersion value of the optical fiber telecommunications system；
Alternatively,
The target power difference is substituted into the functional relation expression formula of preset power difference and polarization mode dispersion value,
Calculated result is obtained, obtained calculated result is determined as the corresponding polarization mode dispersion value of the optical fiber telecommunications system.
Specifically, preset power difference and the graph of relation of polarization mode dispersion value are obtained by multiple groups emulation experiment
's.In the graph of relation, power difference is one-to-one with polarization mode dispersion value, that is to say, that each difference power
Value corresponds to a polarization mode dispersion value, can show that echo signal light is propagated through in optical fiber telecommunications system according to power difference
By the influence value of polarization mode dispersion in journey.
Likewise, the functional relation expression formula of preset power difference and polarization mode dispersion value is also to be emulated in fact by multiple groups
It tests.The functional relation expression formula can be polarization mode dispersion value that multiple groups emulation experiment obtains and corresponding power difference
What fitting obtained, which is linear representation, as graph of relation, in functional relation expression formula,
Power difference and polarization mode dispersion value are one-to-one, so that target power difference be substituted into functional relation expression formula
Polarization mode dispersion value is acquired, to achieve the purpose that the polarization mode dispersion for effectively monitoring optical fiber telecommunications system.
It is emphasized that having been carried out largely imitative before the polarization mode dispersion to optical fiber telecommunications system is monitored
True experiment, the emulation experiment are by the signal light of different frequency by polarization mode dispersion analog module, polarization mode dispersion simulation
Module is by increasing signal light in transmission range wherein, the transmission process of analog signal light in fiber optic communication systems, also
It is to say, emulation experiment is made to be more nearly reality, so that signal light is in the signal light phase obtained by polarization mode dispersion analog module
When the signal light to be monitored in the embodiment of the present invention, then by the signal light obtained through polarization mode dispersion analog module carry out with
The processing of the same step of signal light to be monitored of the embodiment of the present invention.Therefore, the power difference obtained by a large amount of emulation experiments
With the accuracy of the functional relation expression formula of the graph of relation or power difference and polarization mode dispersion value of polarization mode dispersion value
It is higher, to improve the accuracy of monitoring polarization mode dispersion.
It for example, can be by time multiplexing signal by polarization mode dispersion analog module, to obtain in emulation experiment
Generating process to signal light to be monitored, the time multiplexing signal is as follows: generating stochastic ordering by PRBS pseudo-random bit sequence generator
Column signal, wherein the cycle length of the random sequence signal is 215- 1, transmission rate 40Gb/s, duty ratio 20%；It should
Random sequence signal is swashed after zero code (RZ) impulse generator coding by Mach-increasing Dare (MZ) modulators modulate to continuous wave
The centre frequency that light device generates is in the carrier signal of 193.2THz, and four road signals of the carrier signal are delayed 0,1/4,1/ respectively
2,3/4 cycle duration, i.e., be delayed 0ns, 0.00625ns, 0.0125ns, 0.01875ns respectively, then passes through power combiner
Generate time multiplexing signal.
Time multiplexing signal is passed through to the signal light to be monitored obtained after polarization mode dispersion analog module, in order to obtain subsequent
To apparent four-wave mixing effect, signal light image intensifer to be monitored can be amplified, be put under normal conditions by amplifier
The power of big signal light to be monitored is more than or equal to 15dBm.Filter will be passed through by the signal light to be monitored of amplifier amplification,
The narrow band signal light of centre frequency is filtered out, which is 193.2THz；It is narrow by what is filtered out after filtering out narrow band signal light
Band signal light adjusts polarizer polarization angle, obtains the X-axis signal light equal with Y-axis power by Polarization Controller.
Next, generation frequency is 192.55THz, the pump signal light and frequency that performance number 0dBm, bandwidth are 10MHz
The auxiliary signal light that rate is 192.875THz, performance number 0dBm, bandwidth are 10MHz.Generating pump signal light and auxiliary letter
After number light, pump signal light couple with auxiliary signal light by coupler, and by polarizer, obtain X-axis and Y-axis power
Equal detectable signal light.
Then, the equal signal light to be monitored of the X-axis and Y-axis power detectable signal light equal with Y-axis power with X-axis is total to
With in injection highly nonlinear optical fiber, the zero-dispersion wavelength of the highly nonlinear optical fiber is 1556.7nm, nonlinear parameter 11.5W- 1km-1, chromatic dispersion gradient 0.02ps/nm2, conveying length 1km.Be injected into signal light to be monitored in highly nonlinear optical fiber with
Detectable signal light can generate four-wave mixing effect when transmitting in highly nonlinear optical fiber, so that idler light is produced, in height
The receiving end of nonlinear optical fiber filters out signal light to be monitored and idler light by filter, and is measured respectively with power meter
The power of the signal light to be monitored and idler light that filter out, is calculated by difference, can be in the hope of signal light to be monitored and ideler frequency
The power difference of signal light.
Finally, making power difference and polarization mode color according to the corresponding relationship of multiple groups polarization mode dispersion value and power difference
Dissipate the graph of relation of value；Or by fitting multiple groups polarization mode dispersion value and corresponding power difference obtain power difference with it is inclined
The functional relation expression formula of polarization mode dispersion value.Therefore, in practical applications, by calculating echo signal light and idler light
Target power difference, it can compare preset graph of relation or polarization mode color obtained according to preset functional relation
Value is dissipated, so as to realize the monitoring of polarization mode dispersion value.
Compared with prior art, the technical solution of the embodiment of the present invention, monitoring device is simple, and installation cost is lower；Target
Signal light does not need insertion monitoring light during optical fiber telecommunications system is transmitted, therefore frequency spectrum resource utilization rate is high.
Moreover, this programme will after the obtained echo signal light of coupling and detectable signal light is injected into highly nonlinear optical fiber,
Pump signal light in echo signal light and detectable signal light generates four-wave mixing effect in highly nonlinear optical fiber, generates ideler frequency
Signal light, wherein four-wave mixing effect is that the power of echo signal light is transferred to idler light.Since echo signal light exists
It during being transmitted in optical fiber telecommunications system, is influenced by polarization mode dispersion, the pulse broadening of echo signal light, peak power
Reduce, so that four-wave mixing effect weakens, and the auxiliary signal light in detectable signal light can be imitated further in weak four-wave mixing
It answers, so that the power that the power of echo signal light is transferred to idler light is less, i.e. the remaining performance number of echo signal light increases
Greatly, idler optical power value reduction, is calculated by difference, available echo signal optical power and idler optical power
Target power difference.And become with polarization mode dispersion variation tendency or idler light with polarization mode dispersion with echo signal light
Change trend is compared, and resulting target power difference is more obvious with the variation tendency of polarization mode dispersion, to improve polarization mode
The monitoring sensitivity and accuracy of dispersion.
Corresponding to above method embodiment, the embodiment of the invention provides a kind of polarization mode dispersion monitoring devices, are applied to
The receiving end of optical fiber telecommunications system, as shown in Fig. 2, described device includes:
Echo signal light filters out module 210, for receiving signal to be monitored in the receiving end of the optical fiber telecommunications system
Light time filters out echo signal light in the signal light to be monitored；Wherein, the noise of the echo signal light is lower than predetermined threshold；
Pump signal light and auxiliary signal photogenerated module 220 generate pump for the frequency according to the echo signal light
Pu signal light and auxiliary signal light, wherein the pump signal light and the auxiliary signal light are the letter of narrow bandwidth, low-power
Number light；
Detectable signal photogenerated module 230 is obtained for coupling the pump signal light with the auxiliary signal light
To detectable signal light；
Idler photogenerated module 240, for the echo signal light and the detectable signal light to be coupled, and
In the signal light injection highly nonlinear optical fiber that coupling is obtained, idler light is generated；
Target power difference calculating module 250 for filtering out the echo signal light and the idler light, and calculates
The target power difference of the power of the power of the echo signal light filtered out and the idler light filtered out；
Polarization mode dispersion value determining module 260, for obtaining the optical fiber telecommunications system according to the target power difference
Polarization mode dispersion value.
Compared with prior art, the technical solution of the embodiment of the present invention, monitoring device is simple, and installation cost is lower；Target
Signal light does not need insertion monitoring light during optical fiber telecommunications system is transmitted, therefore frequency spectrum resource utilization rate is high.
Moreover, this programme will after the obtained echo signal light of coupling and detectable signal light is injected into highly nonlinear optical fiber,
Pump signal light in echo signal light and detectable signal light generates four-wave mixing effect in highly nonlinear optical fiber, generates ideler frequency
Signal light, wherein four-wave mixing effect is that the power of echo signal light is transferred to idler light.Since echo signal light exists
It during being transmitted in optical fiber telecommunications system, is influenced by polarization mode dispersion, the pulse broadening of echo signal light, peak power
Reduce, so that four-wave mixing effect weakens, and the auxiliary signal light in detectable signal light can be imitated further in weak four-wave mixing
It answers, so that the power that the power of echo signal light is transferred to idler light is less, i.e. the remaining performance number of echo signal light increases
Greatly, idler optical power value reduction, is calculated by difference, available echo signal optical power and idler optical power
Target power difference.And become with polarization mode dispersion variation tendency or idler light with polarization mode dispersion with echo signal light
Change trend is compared, and resulting target power difference is more obvious with the variation tendency of polarization mode dispersion, to improve polarization mode
The monitoring sensitivity and accuracy of dispersion.
Optionally, described device further include:
Judgment module, for judging the mesh before being coupled the echo signal light and the detectable signal light
Whether the performance number of mark signal light is less than predetermined power value；
Power amplifier module, if the performance number for echo signal light is less than predetermined power value, by the echo signal light
Performance number be amplified to the predetermined power value.
Optionally, described device further include:
Power-sharing module, for it is described the echo signal light and the detectable signal light are coupled before,
By the power-sharing of the echo signal light and the detectable signal light to X-axis and Y-axis.
Optionally, the pump signal light and auxiliary signal photogenerated module, are specifically used for:
According to the frequency of the echo signal light, the first frequency of pump signal light is determined；
Generate the pump signal light that frequency size is the first frequency；
The frequency of idler light is calculated according to the first frequency of the frequency of the echo signal light and the pump signal light
Rate；
According to the frequency of the first frequency of the pump signal light and the idler light, the of auxiliary signal light is determined
Two frequencies；
Generate the auxiliary signal light that frequency size is the second frequency.
Optionally, the polarization mode dispersion value determining module, is specifically used for:
From preset power difference and the graph of relation of polarization mode dispersion value, it is corresponding to search the target power difference
Polarization mode dispersion value, the polarization mode dispersion value found is determined as to the polarization mode dispersion value of the optical fiber telecommunications system；
Alternatively,
The target power difference is substituted into the functional relation expression formula of preset power difference and polarization mode dispersion value,
Calculated result is obtained, obtained calculated result is determined as the corresponding polarization mode dispersion value of the optical fiber telecommunications system.
In another embodiment provided by the invention, a kind of electronic equipment 300 is additionally provided, the electronic equipment is optical fiber
The receiving end of communication system, as shown in figure 3, the electronic equipment includes processor 310, communication interface 320, memory 330 and leads to
Believe bus 340, wherein processor, communication interface, memory complete mutual communication by bus；Memory, for storing
Computer program；Processor when for executing the program stored on memory, realizes polarization provided by the embodiment of the present invention
Mode dispersion monitoring method.
The communication bus that above-mentioned electronic equipment is mentioned can be Peripheral Component Interconnect standard (Peripheral Pomponent
Interconnect, abbreviation PCI) bus or expanding the industrial standard structure (Extended Industry Standard
Architecture, abbreviation EISA) bus etc..The communication bus can be divided into address bus, data/address bus, control bus etc..
Only to be indicated with a thick line in figure, it is not intended that an only bus or a type of bus convenient for indicating.
Communication interface is for the communication between above-mentioned electronic equipment and other equipment.
Memory may include random access memory (Random Access Memory, abbreviation RAM), also may include
Nonvolatile memory (non-volatile memory), for example, at least a magnetic disk storage.Optionally, memory may be used also
To be storage device that at least one is located remotely from aforementioned processor.
Above-mentioned processor can be general processor, including central processing unit (Central Processing Unit,
Abbreviation CPU), network processing unit (Ne twork Processor, abbreviation NP) etc.；It can also be digital signal processor
(Digital Signal Processing, abbreviation DSP), specific integrated circuit (Applica tion Specific
Integrated Circuit, abbreviation ASIC), field programmable gate array (Field-Programmable Gate Array,
Abbreviation FPGA) either other programmable logic device, discrete gate or transistor logic, discrete hardware components.
In another embodiment provided by the invention, a kind of computer readable storage medium is additionally provided, which can
It reads to be stored with computer program in storage medium, be realized provided by the embodiment of the present invention when computer program is executed by processor
Polarization mode dispersion monitoring method.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention
It is interior.
Claims (8)
1. a kind of polarization mode dispersion monitoring method, which is characterized in that applied to the receiving end of optical fiber telecommunications system, the method packet
It includes:
When the receiving end of the optical fiber telecommunications system receives signal light to be monitored, the mesh in the signal light to be monitored is filtered out
Mark signal light；Wherein, the noise of the echo signal light is lower than predetermined threshold；
According to the frequency of the echo signal light, generate pump signal light and auxiliary signal light, wherein the pump signal light and
The auxiliary signal light is the signal light of narrow bandwidth, low-power；
The pump signal light is coupled with the auxiliary signal light, obtains detectable signal light；
The signal light that the echo signal light and the detectable signal light are coupled, and coupling is obtained injects high non-linearity
In optical fiber, idler light is generated；
Filter out the echo signal light and the idler light, and the spare time for calculating the power of the echo signal light filtered out and filtering out
The target power difference of the power of frequency signal light；
According to the target power difference, the polarization mode dispersion value of the optical fiber telecommunications system is obtained；
Wherein, the wavelength of the pump signal light is greater than the wavelength of the echo signal light, the frequency etc. of the idler light
The frequency of the echo signal light is subtracted in two times of the pump signal light frequency, the frequency of the auxiliary signal light is described
The half of the frequency of idler light and the sum of the frequency of pump signal light.
2. the method according to claim 1, wherein described by the echo signal light and the detectable signal
Before light is coupled, the method also includes:
Judge whether the performance number of the echo signal light is less than predetermined power value；
If it is, the performance number of the echo signal light is amplified to the predetermined power value.
3. method according to claim 1 or 2, which is characterized in that described by the echo signal light and the detection
Before signal light is coupled, the method also includes: by the power-sharing of the echo signal light and the detectable signal light
To X-axis and Y-axis.
4. the method according to claim 1, wherein the frequency according to the echo signal light, generates pump
The step of Pu signal light and auxiliary signal light, comprising:
According to the frequency of the echo signal light, the first frequency of pump signal light is determined；
Generate the pump signal light that frequency size is the first frequency；
The frequency of idler light is calculated according to the first frequency of the frequency of the echo signal light and the pump signal light；
According to the frequency of the first frequency of the pump signal light and the idler light, the second frequency of auxiliary signal light is determined
Rate；
Generate the auxiliary signal light that frequency size is the second frequency.
5. obtaining the light the method according to claim 1, wherein described according to the target power difference
The step of polarization mode dispersion value of fiber communication system, comprising:
From preset power difference and the graph of relation of polarization mode dispersion value, it is corresponding partially to search the target power difference
The polarization mode dispersion value found is determined as the polarization mode dispersion value of the optical fiber telecommunications system by polarization mode dispersion value；Alternatively,
The target power difference is substituted into the functional relation expression formula of preset power difference and polarization mode dispersion value, is obtained
Obtained calculated result is determined as the corresponding polarization mode dispersion value of the optical fiber telecommunications system by calculated result.
6. a kind of polarization mode dispersion monitoring device, which is characterized in that applied to the receiving end of optical fiber telecommunications system, described device packet
It includes:
Echo signal light filters out module, for filtering when the receiving end of the optical fiber telecommunications system receives signal light to be monitored
Echo signal light in the signal light to be monitored out；Wherein, the noise of the echo signal light is lower than predetermined threshold；
Pump signal light and auxiliary signal photogenerated module generate pump signal for the frequency according to the echo signal light
Light and auxiliary signal light, wherein the pump signal light and the auxiliary signal light are the signal light of narrow bandwidth, low-power；
Detectable signal photogenerated module is detected for coupling the pump signal light with the auxiliary signal light
Signal light；
Idler photogenerated module, for the echo signal light and the detectable signal light to be coupled, and will coupling
In obtained signal light injection highly nonlinear optical fiber, idler light is generated；
Target power difference calculating module for filtering out the echo signal light and the idler light, and is calculated and to be filtered out
The target power difference of the power of the power of echo signal light and the idler light filtered out；
Polarization mode dispersion value determining module, for obtaining the polarization of the optical fiber telecommunications system according to the target power difference
Mode dispersion value；
Wherein, the wavelength of the pump signal light is greater than the wavelength of the echo signal light, the frequency etc. of the idler light
The frequency of the echo signal light is subtracted in two times of the pump signal light frequency, the frequency of the auxiliary signal light is described
The half of the frequency of idler light and the sum of the frequency of pump signal light.
7. a kind of electronic equipment, the electronic equipment is the receiving end of optical fiber telecommunications system, which is characterized in that including processor,
Communication interface, memory and communication bus, wherein processor, communication interface, memory complete mutual lead to by bus
Letter,
Memory, for storing computer program；
Processor when for executing the program stored on memory, realizes any method and step of claim 1-5.
8. a kind of computer readable storage medium, which is characterized in that be stored with computer in the computer readable storage medium
Program realizes claim 1-5 any method and step when the computer program is executed by processor.
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| CN110266388B (en) * | 2019-06-18 | 2020-09-04 | 北京邮电大学 | PMD (polarization mode dispersion) equalization method and device, electronic equipment and storage medium |
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