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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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 the field of communications technologies, and in particular, to a method and an apparatus for monitoring polarization mode dispersion, an electronic device, and a storage medium.
Background
With the continuous increase of the transmission rate of the optical fiber communication system and the continuous increase of the transmission distance of the optical signal in the optical fiber communication system, the optical fiber dispersion (CD), the optical signal to noise ratio (OSNR) and the polarization film dispersion (PMD) have a great influence on the transmission quality of the optical fiber communication system.
In the prior art, monitoring schemes of optical fiber dispersion (CD) and optical signal to noise ratio (OSNR) are relatively perfect, but are not perfect enough in polarization film dispersion (PMD) monitoring, and the following disadvantages mainly exist: firstly, equipment needs to be added at a transmitting end of an optical signal, so that the practicability of an optical fiber communication system is reduced; or monitoring light needs to be inserted in the process of optical signal transmission, so that the frequency spectrum utilization rate of the optical fiber communication system is reduced; second, polarization mode dispersion is monitored, typically by the nonlinear effect of the signal light to be monitored. One of the methods is to monitor the signal light to be monitored by using its own characteristics, for example, by using the self-phase modulation nonlinear effect of the signal light to be monitored; another way is to use the nonlinear effect generated by the signal light to be monitored and the pump signal light for monitoring. Both of these two methods for monitoring polarization mode dispersion have the disadvantages of low monitoring sensitivity and accuracy.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a method and an apparatus for monitoring polarization mode dispersion, an electronic device, and a storage medium, so as to improve the utilization rate and the practicability of an optical fiber communication system and the monitoring sensitivity and the accuracy of polarization mode dispersion on the premise of effectively monitoring polarization mode dispersion. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a polarization mode dispersion monitoring method, which is applied to a receiving end of an optical fiber communication system, and the method includes:
when a receiving end of the optical fiber communication system receives signal light to be monitored, filtering out target signal light in the signal light to be monitored; wherein the noise of the target signal light is below a predetermined threshold;
generating pump signal light and auxiliary signal light according to the frequency of the target signal light, wherein the pump signal light and the auxiliary signal light are narrow-bandwidth and low-power signal light;
coupling the pumping signal light and the auxiliary signal light to obtain detection signal light;
coupling the target signal light and the detection signal light, and injecting the coupled signal light into a high nonlinear optical fiber to generate idler frequency signal light;
filtering out the target signal light and the idler signal light, and calculating a target power difference value of the power of the filtered target signal light and the power of the filtered idler signal light;
and obtaining the polarization mode dispersion value of the optical fiber communication system according to the target power difference value.
Optionally, before the coupling the target signal light and the detection signal light, the method further includes:
judging whether the power value of the target signal light is smaller than a preset power value;
if yes, amplifying the power value of the target signal light to the preset power value.
Optionally, before the coupling the target signal light and the detection signal light, the method further includes: and equally dividing the power of the target signal light and the power of the detection signal light to an X axis and a Y axis.
Optionally, the step of generating the pump signal light and the auxiliary signal light according to the frequency of the target signal light includes:
determining a first frequency of the pumping signal light according to the frequency of the target signal light;
generating pumping signal light with the frequency of the first frequency;
calculating the frequency of the idler frequency light according to the frequency of the target signal light and the first frequency of the pumping signal light;
determining a second frequency of the auxiliary signal light according to the first frequency of the pump signal light and the frequency of the idler signal light;
and generating auxiliary signal light with the frequency of the second frequency.
Optionally, the step of obtaining the polarization mode dispersion value of the optical fiber communication system according to the target power difference value includes:
searching a polarization mode dispersion value corresponding to the target power difference value from a preset relation curve graph of the power difference value and the polarization mode dispersion value, and determining the searched polarization mode dispersion value as the polarization mode dispersion value of the optical fiber communication system; or,
and substituting the target power difference value into a function relation expression of a preset power difference value and a polarization mode dispersion value to obtain a calculation result, and determining the obtained calculation result as the polarization mode dispersion value corresponding to the optical fiber communication system.
In a second aspect, an embodiment of the present invention further provides a polarization mode dispersion monitoring device, which is applied to a receiving end of an optical fiber communication system, where the device includes:
the target signal light filtering module is used for filtering out target signal light in the signal light to be monitored when a receiving end of the optical fiber communication system receives the signal light to be monitored; wherein the noise of the target signal light is below a predetermined threshold;
a pump signal light and auxiliary signal light generation module, configured to generate a pump signal light and an auxiliary signal light according to a frequency of the target signal light, where the pump signal light and the auxiliary signal light are both narrow-bandwidth and low-power signal lights;
the detection signal light generation module is used for coupling the pumping signal light and the auxiliary signal light to obtain detection signal light;
an idler frequency signal light generating module, configured to couple the target signal light and the detection signal light, and inject the coupled signal light into a high nonlinear optical fiber to generate idler frequency signal light;
a target power difference calculation module, configured to filter out the target signal light and the idler signal light, and calculate a target power difference between the power of the filtered target signal light and the power of the filtered idler signal light;
and the polarization mode dispersion value determining module is used for obtaining the polarization mode dispersion value of the optical fiber communication system according to the target power difference value.
Optionally, the apparatus further comprises:
a determining module, configured to determine whether a power value of the target signal light is smaller than a predetermined power value before the target signal light and the detection signal light are coupled;
and the power amplification module is used for amplifying the power value of the target signal light to the preset power value if the power value of the target signal light is smaller than the preset power value.
Optionally, the apparatus further comprises:
and the power equalizing module is used for equalizing the power of the target signal light and the power of the detection signal light to an X axis and a Y axis before the target signal light and the detection signal light are coupled.
Optionally, the pump signal light and auxiliary signal light generating module is specifically configured to:
determining a first frequency of the pumping signal light according to the frequency of the target signal light;
generating pumping signal light with the frequency of the first frequency;
calculating the frequency of the idler frequency light according to the frequency of the target signal light and the first frequency of the pumping signal light;
determining a second frequency of the auxiliary signal light according to the first frequency of the pump signal light and the frequency of the idler signal light;
and generating auxiliary signal light with the frequency of the second frequency.
Optionally, the polarization mode dispersion value determining module is specifically configured to:
searching a polarization mode dispersion value corresponding to the target power difference value from a preset relation curve graph of the power difference value and the polarization mode dispersion value, and determining the searched polarization mode dispersion value as the polarization mode dispersion value of the optical fiber communication system; or,
and substituting the target power difference value into a function relation expression of a preset power difference value and a polarization mode dispersion value to obtain a calculation result, and determining the obtained calculation result as the polarization mode dispersion value corresponding to the optical fiber communication system.
In a third aspect, an embodiment of the present invention further provides an electronic device, where the electronic device is a receiving end of an optical fiber communication system, and includes a processor, a communication interface, a memory, and a communication bus, where the processor, the communication interface, and the memory complete mutual communication through the bus,
a memory for storing a computer program;
a processor, configured to, when executing the program stored in the memory, enable the electronic device to perform any one of the polarization mode dispersion monitoring methods described in the first aspect.
In a fourth aspect, the present invention further provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the computer program causes an electronic device to execute any one of the polarization mode dispersion monitoring methods described in the first aspect.
Compared with the prior art, the technical scheme of the embodiment of the invention has the advantages of simple monitoring device and lower device cost; monitoring light does not need to be inserted into target signal light in the transmission process of the optical fiber communication system, so that the utilization rate of frequency spectrum resources is high.
In addition, according to the scheme, after the target signal light and the detection signal light obtained through coupling are injected into the high-nonlinearity optical fiber, a four-wave mixing effect is generated in the high-nonlinearity optical fiber by the pump signal light in the target signal light and the detection signal light, and idle-frequency signal light is generated, wherein the four-wave mixing effect is used for transferring the power of the target signal light to the idle-frequency signal light. In the process of transmitting the target signal light in the optical fiber communication system, the target signal light is affected by polarization mode dispersion, pulses of the target signal light are widened, peak power is reduced, and the four-wave mixing effect is weakened, and the auxiliary signal light in the detection signal light can further weaken the four-wave mixing effect, so that the power of the target signal light transferred to the idler signal light is less, namely the residual power value of the target signal light is increased, the power value of the idler signal light is reduced, and the target power difference value of the target signal light power and the idler signal light power can be obtained through difference calculation. Compared with the trend of target signal light changing with the polarization mode dispersion or the trend of idler signal light changing with the polarization mode dispersion, the obtained target power difference value has more obvious trend of changing with the polarization mode dispersion, and therefore the monitoring sensitivity and the monitoring accuracy of the polarization mode dispersion are improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a polarization mode dispersion monitoring method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a polarization mode dispersion monitoring apparatus according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to improve the utilization rate and the practicability of an optical fiber communication system on the premise of effectively monitoring polarization mode dispersion, the embodiment of the invention provides a polarization mode dispersion monitoring method, a polarization mode dispersion monitoring device, electronic equipment and a storage medium.
It should be noted that the method and apparatus for monitoring polarization mode dispersion provided in the embodiments of the present invention are applied to a receiving end of an optical fiber communication system, so as to effectively monitor polarization mode dispersion of the optical fiber communication system.
First, a method for monitoring polarization mode dispersion provided by an embodiment of the present invention is described below.
As shown in fig. 1, a method for monitoring polarization mode dispersion according to an embodiment of the present invention may include the following steps:
s110, when a receiving end of the optical fiber communication system receives signal light to be monitored, filtering out target signal light in the signal light to be monitored; wherein the noise of the target signal light is below a predetermined threshold;
as will be understood by those skilled in the art, signal light is affected by noise during transmission in an optical fiber communication system, and therefore, when the optical fiber communication system receives signal light to be monitored, in order to reduce the influence of noise on subsequent steps, noise filtering processing may be performed through a filter to filter out a frequency band where the signal light to be monitored is located, and to filter out interference noise in other frequency bands, so as to obtain target signal light with noise lower than a predetermined threshold.
It should be noted that, since the noise is random and has uncertainty, the predetermined threshold has uncertainty, and the predetermined threshold is related to the center frequency and the bandwidth of the filter, which are determined according to the obtained target signal light frequency and bandwidth. Wherein the center frequency of the filter is set to the center frequency of the target signal light; the bandwidth of the filter may be greater than the bandwidth of the target signal light or smaller than the bandwidth of the target signal light, where a ratio of the bandwidth of the filter to the bandwidth of the target signal is between 0.5 and 2, which is reasonable.
S120, generating pumping signal light and auxiliary signal light according to the frequency of the target signal light, wherein the pumping signal light and the auxiliary signal light are narrow-bandwidth and low-power signal light;
after the target signal light is obtained, the signal light is emitted by the continuous wave laser according to the frequency of the target signal light to generate pumping signal light and auxiliary signal light with narrow bandwidth and low power.
It should be noted that, since the pump signal light and the auxiliary signal light are both generated by emission of the continuous wave laser, the bandwidth of the pump signal light and the auxiliary signal light generated in the embodiment of the present invention is several tens of mhz, and the power of the pump signal light and the auxiliary signal light may be between-3 dBm and 3 dBm.
It will be appreciated that continuous wave lasers of different performance emit different quality optical signals, and that continuous wave lasers of the prior art can be used in embodiments of the present invention to generate pump signal light and auxiliary signal light in embodiments of the present invention.
Optionally, the step of generating the pump signal light and the auxiliary signal light according to the frequency of the target signal light includes:
determining a first frequency of the pumping signal light according to the frequency of the target signal light;
generating pumping signal light with the frequency of the first frequency;
calculating the frequency of the idler frequency light according to the frequency of the target signal light and the first frequency of the pumping signal light;
determining a second frequency of the auxiliary signal light according to the first frequency of the pump signal light and the frequency of the idler signal light;
and generating auxiliary signal light with the frequency of the second frequency.
Specifically, the emission frequency of the continuous wave laser is first adjusted, and the bandwidth of the signal light emitted by the continuous wave laser is set, so as to generate the pump signal light with the frequency of the first frequency.
It should be noted that the emission frequency is determined according to the frequency of the target signal light, and it is reasonable that the bandwidth of the signal light emitted by the continuous wave laser is dozens of megahertz. Specifically, the first frequency of the pump signal light is controlled to be smaller than the frequency of the target signal light by adjusting the emission frequency of the continuous wave laser, the frequency of the target signal light is different from the first frequency, and the obtained difference is reasonable within hundreds of gigahertz. That is, the wavelength of the pump signal light is greater than the wavelength of the target signal light, and it is reasonable to make a difference between the wavelength of the pump signal light and the wavelength of the target signal light, and the obtained difference is several nanometers.
After the pump signal light is generated, the frequency of the idler light, which is equal to twice the frequency of the pump signal light minus the frequency of the target signal light, can be calculated from the frequency of the target signal light and the frequency of the pump signal light. The idler light may be generated by a four-wave mixing effect of the target signal light and the pump signal light, and will be described in detail later for clarity of the description of the scheme. After the frequency of the idler light is calculated, the frequency of the auxiliary signal light can be determined according to the frequency of the idler light and the frequency of the pump signal light, wherein the frequency of the auxiliary signal light is the middle value of the frequency of the idler light and the frequency of the pump signal light, namely the frequency of the auxiliary signal light is half of the sum of the frequency of the idler light and the frequency of the pump signal light.
S130, coupling the pumping signal light and the auxiliary signal light to obtain detection signal light;
after generating the pump signal light and the auxiliary signal light, the pump light with narrow bandwidth and weak power is coupled with the auxiliary light through the optical coupler to obtain the detection signal light. And a foundation is laid for effectively monitoring polarization mode dispersion. It should be noted that the optical coupler may be a 2 × 1 optical coupler, and of course, the optical coupler may also be a coupler of another type, which is not specifically limited in this embodiment of the present invention.
S140, coupling the target signal light and the detection signal light, and injecting the coupled signal light into a high-nonlinearity optical fiber to generate idler frequency signal light;
optionally, the step of generating an idler signal light by using the target signal light and the probe signal light includes:
coupling the target signal light and the detection signal light;
and injecting the signal light obtained by coupling into the high-nonlinearity optical fiber to obtain idler frequency signal light.
After the detection signal light is obtained, coupling the target signal light and the detection signal light through a coupler to obtain coupled signal light, and injecting the coupled signal light into a high-nonlinearity optical fiber, wherein in the high-nonlinearity optical fiber, pump signal light in the detection signal light and the target signal light can generate a four-wave mixing effect, and after the four-wave mixing effect, two new signal lights can be generated, and in the two new signal lights, the signal light which is in a conjugate relation with the target signal light is idler frequency signal light. Moreover, because the detection signal light contains not only the pumping signal light but also the auxiliary signal light, the auxiliary signal light can generate a four-wave mixing effect with the pumping signal light and the idler frequency light in the high nonlinear optical fiber to generate two paths of new signal light, wherein the signal light obtained by four-wave mixing with the pumping signal light and the target signal light can be four-wave mixed to generate another path of new signal light, namely, at the moment, a plurality of paths of signal light are generated through the four-wave mixing effect, and in the process, the trend that the power value of the idler frequency light is reduced along with the increase of the polarization mode dispersion value can be increased; accordingly, the tendency that the residual target signal optical power value after four-wave mixing increases as the polarization mode dispersion value increases is also amplified due to the addition of the auxiliary light. Therefore, the target power difference obtained by subtracting the power value of the target signal light and the power value of the idler signal light is amplified, and the variation trend of the target power difference along with the polarization mode dispersion is increased to a certain extent, so that the monitoring sensitivity and the monitoring accuracy of the polarization mode dispersion are improved.
Optionally, before the coupling the target signal light and the detection signal light, the method may further include:
judging whether the power value of the target signal light is smaller than a preset power value;
if yes, amplifying the power value of the target signal light to the preset power value.
If the power value of the target signal light received by the receiving end of the optical fiber communication system is too small, the four-wave mixing effect generated by the detection signal light and the target signal light in the high-nonlinearity optical fiber is weak, which is not beneficial to the generation of idler signal light, so that the sensitivity and accuracy of monitoring polarization mode dispersion are reduced, therefore, before the detection signal light and the target signal light are injected into the high-nonlinearity optical fiber, whether the power value of the target signal light reaches a predetermined power value can be judged, and under the normal condition, the predetermined power value is 15 dBm. If the power value of the target signal light is smaller than the predetermined power value, the target signal light can be amplified through the amplifier, that is, the power value of the target signal light is greater than or equal to the predetermined power value, so that the detection signal light and the target signal light generate an obvious four-wave mixing effect in the high-nonlinearity optical fiber, and the sensitivity and the accuracy of monitoring polarization mode dispersion are improved.
Optionally, before the coupling the target signal light and the detection signal light, the method may further include:
and equally dividing the power of the target signal light and the power of the detection signal light to an X axis and a Y axis.
In order to enable the detection signal light and the target signal light to generate a more obvious four-wave mixing effect in the high-nonlinearity optical fiber, the power of the target signal light and the power of the detection signal light can be equally divided to an X axis and a Y axis by passing the target signal light and the detection signal light through a polarizer and adjusting the polarization angle of the polarizer, so that the influence on the four-wave mixing effect due to too large signal-to-noise ratio in the X axis direction or too large signal-to-noise ratio in the Y axis direction is reduced. Therefore, when the detection signal light and the target signal light are propagated in the high-nonlinearity optical fiber, the signal light transmitted in the X-axis direction and the Y-axis direction can generate corresponding four-wave mixing effect with equivalent mixing degree.
S150, filtering out the target signal light and the idler signal light, and calculating a target power difference value of the power of the filtered target signal light and the power of the filtered idler signal light; the signal light after the four-wave mixing effect includes the detection signal light, the target signal light and the newly generated idler light. Because the signal light to be monitored is influenced by polarization mode dispersion in the optical fiber communication system, the pulse of the signal light to be monitored is widened, and the peak value of the signal light to be monitored is reduced, the peak value of the target signal light filtered by the signal light to be monitored through the filter is also reduced, so that the target signal light influences the four-wave mixing effect.
Specifically, the target signal light attenuates the four-wave mixing effect during the transmission of the highly nonlinear optical fiber, and the auxiliary signal light in the detection signal light further attenuates the four-wave mixing effect. Note that the four-wave mixing effect is to transfer the power of the target signal light to the idler light. Because the four-wave mixing effect is attenuated, the power of the target signal light transferred to the idler signal light is less, namely the residual power value of the target signal light is increased, the power value of the idler signal light is reduced, the target signal light and the idler signal light are filtered, and the target power difference value of the power of the target signal light and the power of the idler signal light is calculated. Compared with the trend of target signal light changing with the polarization mode dispersion or the trend of idler signal light changing with the polarization mode dispersion, the obtained target power difference value has more obvious trend of changing with the polarization mode dispersion, so that the monitoring sensitivity and the monitoring accuracy of the polarization mode dispersion can be improved.
For example, a bandpass filter is used to filter out a target signal light and an idler signal light in the signal light after the four-wave mixing effect, power of the target signal light and the idler signal light is measured by an optical power meter, then the power of the target signal light and the power of the idler signal light obtained by measurement are subtracted, and the obtained difference is a target power difference.
And S160, obtaining the polarization mode dispersion value of the optical fiber communication system according to the target power difference value.
Optionally, the step of obtaining a polarization mode dispersion value of the optical fiber communication system according to the target power difference value includes:
searching a polarization mode dispersion value corresponding to the target power difference value from a preset relation curve graph of the power difference value and the polarization mode dispersion value, and determining the searched polarization mode dispersion value as the polarization mode dispersion value of the optical fiber communication system; or,
and substituting the target power difference value into a function relation expression of a preset power difference value and a polarization mode dispersion value to obtain a calculation result, and determining the obtained calculation result as the polarization mode dispersion value corresponding to the optical fiber communication system.
Specifically, the preset relation curve graph of the power difference value and the polarization mode dispersion value is obtained through a plurality of sets of simulation experiments. In the relation graph, the power difference values and the polarization mode dispersion values are in one-to-one correspondence, that is, each power difference value corresponds to one polarization mode dispersion value, and the influence value of the polarization mode dispersion on the target signal light in the transmission process of the optical fiber communication system can be obtained according to the power difference values.
Similarly, the preset functional relation expression of the power difference value and the polarization mode dispersion value is also obtained through a plurality of groups of simulation experiments. The functional relation expression can be obtained by fitting a plurality of groups of polarization mode dispersion values obtained by simulation experiments with corresponding power difference values, is a linear expression, and is the same as a relation curve graph, and in the functional relation expression, the power difference values and the polarization mode dispersion values are in one-to-one correspondence, so that the target power difference values are substituted into the functional relation expression to obtain the polarization mode dispersion values, and the purpose of effectively monitoring the polarization mode dispersion of the optical fiber communication system is achieved.
It should be emphasized that, before monitoring the polarization mode dispersion of the optical fiber communication system, a lot of simulation experiments are performed, in which signal lights with different frequencies pass through the polarization mode dispersion simulation module, the polarization mode dispersion simulation module simulates the transmission process of the signal light in the optical fiber communication system by increasing the transmission distance of the signal light therein, that is, the simulation experiments are closer to reality, so that the signal light obtained by the signal light passing through the polarization mode dispersion simulation module is equivalent to the signal light to be monitored in the embodiment of the present invention, and then the signal light obtained by the polarization mode dispersion simulation module is processed in the same step as the signal light to be monitored in the embodiment of the present invention. Therefore, the accuracy of the relation curve graph of the power difference value and the polarization mode dispersion value or the function relation expression of the power difference value and the polarization mode dispersion value obtained through a large number of simulation experiments is higher, and the accuracy of monitoring the polarization mode dispersion is improved.
For example, in a simulation experiment, a time division multiplexing signal may pass through a polarization mode dispersion analog module, so as to obtain signal light to be monitored, where the generation process of the time division multiplexing signal is as follows: generating a random sequence signal by a pseudo-random bit sequence generator, wherein the random sequence signal has a period length of 215-1, transmission rate of 40Gb/s, duty cycle of 20%; the random sequence signal is modulated to a carrier signal with 193.2THz center frequency generated by a continuous wave laser through a Mach-Zehnder (MZ) modulator after being coded by a return-to-zero (RZ) pulse generator, four paths of signals of the carrier signal are respectively delayed for 0, 1/4, 1/2 and 3/4 period durations, namely 0ns, 0.00625ns, 0.0125ns and 0.01875ns, and then the time division multiplexing signal is generated through a power synthesizer.
The signal light to be monitored obtained by passing the time division multiplexing signal through the polarization mode dispersion analog module can be amplified by an optical amplifier in order to obtain an obvious four-wave mixing effect in the subsequent process, and the power of the signal light to be monitored amplified by the amplifier is more than or equal to 15dBm in general. The signal light to be monitored, which is amplified by the amplifier, passes through a filter, and narrow-band signal light with the center frequency is filtered out, wherein the center frequency is 193.2 THz; after filtering out the narrow-band signal light, the filtered narrow-band signal light passes through a polarization controller, and the polarization angle of a polarizer is adjusted to obtain the signal light with the power equal to that of the X axis and the Y axis.
Next, a pump signal light having a frequency of 192.55THz, a power value of 0dBm, and a bandwidth of 10MHz, and an auxiliary signal light having a frequency of 192.875THz, a power value of 0dBm, and a bandwidth of 10MHz were generated. After the pump signal light and the auxiliary signal light are generated, the pump signal light and the auxiliary signal light are coupled through a coupler and pass through a polarizer, and detection signal light with equal power of an X axis and a Y axis is obtained.
Then, the signal light to be monitored with equal power of the X axis and the Y axis and the detection signal light with equal power of the X axis and the Y axis are injected into the high nonlinear optical fiber together, the zero dispersion wavelength of the high nonlinear optical fiber is 1556.7nm, and the nonlinear parameter is 11.5W- 1km-1The dispersion slope is 0.02ps/nm2The transmission length is 1 km. The signal light to be monitored and the detection signal light injected into the high nonlinear optical fiber can generate a four-wave mixing effect when being transmitted in the high nonlinear optical fiber, so that idler signal light is generated, the signal light to be monitored and the idler signal light are filtered out through a filter at a receiving end of the high nonlinear optical fiber, the power of the filtered signal light to be monitored and the power of the filtered idler signal light are respectively measured through a power meter, and the power difference value of the signal light to be monitored and the power difference value of the idler signal light can be obtained through difference value calculation.
Finally, according to the corresponding relation between the multiple groups of polarization mode dispersion values and the power difference values, a relation curve graph of the power difference values and the polarization mode dispersion values is made; or fitting a plurality of groups of polarization mode dispersion values and corresponding power difference values to obtain a functional relation expression of the power difference values and the polarization mode dispersion values. Therefore, in practical application, the polarization mode dispersion value can be obtained by contrasting a preset relation curve chart or according to a preset function relation through calculating the target power difference value of the target signal light and the idler signal light, so that the monitoring of the polarization mode dispersion value can be realized.
Compared with the prior art, the technical scheme of the embodiment of the invention has the advantages of simple monitoring device and lower device cost; monitoring light does not need to be inserted into target signal light in the transmission process of the optical fiber communication system, so that the utilization rate of frequency spectrum resources is high.
In addition, according to the scheme, after the target signal light and the detection signal light obtained through coupling are injected into the high-nonlinearity optical fiber, a four-wave mixing effect is generated in the high-nonlinearity optical fiber by the pump signal light in the target signal light and the detection signal light, and idle-frequency signal light is generated, wherein the four-wave mixing effect is used for transferring the power of the target signal light to the idle-frequency signal light. In the process of transmitting the target signal light in the optical fiber communication system, the target signal light is affected by polarization mode dispersion, pulses of the target signal light are widened, peak power is reduced, and the four-wave mixing effect is weakened, and the auxiliary signal light in the detection signal light can further weaken the four-wave mixing effect, so that the power of the target signal light transferred to the idler signal light is less, namely the residual power value of the target signal light is increased, the power value of the idler signal light is reduced, and the target power difference value of the target signal light power and the idler signal light power can be obtained through difference calculation. Compared with the trend of target signal light changing with the polarization mode dispersion or the trend of idler signal light changing with the polarization mode dispersion, the obtained target power difference value has more obvious trend of changing with the polarization mode dispersion, and therefore the monitoring sensitivity and the monitoring accuracy of the polarization mode dispersion are improved.
Corresponding to the above method embodiment, an embodiment of the present invention provides a polarization mode dispersion monitoring apparatus, which is applied to a receiving end of an optical fiber communication system, and as shown in fig. 2, the apparatus includes:
a target signal light filtering module 210, configured to filter out target signal light in signal light to be monitored when a receiving end of the optical fiber communication system receives the signal light to be monitored; wherein the noise of the target signal light is below a predetermined threshold;
a pump signal light and auxiliary signal light generating module 220, configured to generate a pump signal light and an auxiliary signal light according to a frequency of the target signal light, where the pump signal light and the auxiliary signal light are both narrow-bandwidth and low-power signal lights;
a detection signal light generating module 230, configured to couple the pump signal light and the auxiliary signal light to obtain a detection signal light;
an idler signal light generating module 240, configured to couple the target signal light and the detection signal light, and inject the signal light obtained through coupling into a high-nonlinearity optical fiber to generate idler signal light;
a target power difference calculation module 250, configured to filter out the target signal light and the idler signal light, and calculate a target power difference between the power of the filtered target signal light and the power of the filtered idler signal light;
and a polarization mode dispersion value determining module 260, configured to obtain a polarization mode dispersion value of the optical fiber communication system according to the target power difference value.
Compared with the prior art, the technical scheme of the embodiment of the invention has the advantages of simple monitoring device and lower device cost; monitoring light does not need to be inserted into target signal light in the transmission process of the optical fiber communication system, so that the utilization rate of frequency spectrum resources is high.
In addition, according to the scheme, after the target signal light and the detection signal light obtained through coupling are injected into the high-nonlinearity optical fiber, a four-wave mixing effect is generated in the high-nonlinearity optical fiber by the pump signal light in the target signal light and the detection signal light, and idle-frequency signal light is generated, wherein the four-wave mixing effect is used for transferring the power of the target signal light to the idle-frequency signal light. In the process of transmitting the target signal light in the optical fiber communication system, the target signal light is affected by polarization mode dispersion, pulses of the target signal light are widened, peak power is reduced, and the four-wave mixing effect is weakened, and the auxiliary signal light in the detection signal light can further weaken the four-wave mixing effect, so that the power of the target signal light transferred to the idler signal light is less, namely the residual power value of the target signal light is increased, the power value of the idler signal light is reduced, and the target power difference value of the target signal light power and the idler signal light power can be obtained through difference calculation. Compared with the trend of target signal light changing with the polarization mode dispersion or the trend of idler signal light changing with the polarization mode dispersion, the obtained target power difference value has more obvious trend of changing with the polarization mode dispersion, and therefore the monitoring sensitivity and the monitoring accuracy of the polarization mode dispersion are improved.
Optionally, the apparatus further comprises:
a determining module, configured to determine whether a power value of the target signal light is smaller than a predetermined power value before the target signal light and the detection signal light are coupled;
and the power amplification module is used for amplifying the power value of the target signal light to the preset power value if the power value of the target signal light is smaller than the preset power value.
Optionally, the apparatus further comprises:
and the power equalizing module is used for equalizing the power of the target signal light and the power of the detection signal light to an X axis and a Y axis before the target signal light and the detection signal light are coupled.
Optionally, the pump signal light and auxiliary signal light generating module is specifically configured to:
determining a first frequency of the pumping signal light according to the frequency of the target signal light;
generating pumping signal light with the frequency of the first frequency;
calculating the frequency of the idler frequency light according to the frequency of the target signal light and the first frequency of the pumping signal light;
determining a second frequency of the auxiliary signal light according to the first frequency of the pump signal light and the frequency of the idler signal light;
and generating auxiliary signal light with the frequency of the second frequency.
Optionally, the polarization mode dispersion value determining module is specifically configured to:
searching a polarization mode dispersion value corresponding to the target power difference value from a preset relation curve graph of the power difference value and the polarization mode dispersion value, and determining the searched polarization mode dispersion value as the polarization mode dispersion value of the optical fiber communication system; or,
and substituting the target power difference value into a function relation expression of a preset power difference value and a polarization mode dispersion value to obtain a calculation result, and determining the obtained calculation result as the polarization mode dispersion value corresponding to the optical fiber communication system.
In another embodiment provided by the present invention, an electronic device 300 is further provided, where the electronic device is a receiving end of an optical fiber communication system, as shown in fig. 3, the electronic device includes a processor 310, a communication interface 320, a memory 330, and a communication bus 340, where the processor, the communication interface, and the memory complete communication with each other through the bus; a memory for storing a computer program; and the processor is used for realizing the polarization mode dispersion monitoring method provided by the embodiment of the invention when executing the program stored in the memory.
The communication bus mentioned in the electronic device may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a network Processor (Ne word Processor, NP), and the like; the integrated Circuit may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component.
In another embodiment provided by the present invention, a computer-readable storage medium is further provided, in which a computer program is stored, and when the computer program is executed by a processor, the polarization mode dispersion monitoring method provided by the embodiment of the present invention is implemented.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. A polarization mode dispersion monitoring method is applied to a receiving end of an optical fiber communication system, and comprises the following steps:
when a receiving end of the optical fiber communication system receives signal light to be monitored, filtering out target signal light in the signal light to be monitored; wherein the noise of the target signal light is below a predetermined threshold;
generating pump signal light and auxiliary signal light according to the frequency of the target signal light, wherein the pump signal light and the auxiliary signal light are narrow-bandwidth and low-power signal light;
coupling the pumping signal light and the auxiliary signal light to obtain detection signal light;
coupling the target signal light and the detection signal light, and injecting the coupled signal light into a high nonlinear optical fiber to generate idler frequency signal light;
filtering out the target signal light and the idler signal light, and calculating a target power difference value of the power of the filtered target signal light and the power of the filtered idler signal light;
obtaining a polarization mode dispersion value of the optical fiber communication system according to the target power difference value;
the wavelength of the pump signal light is greater than that of the target signal light, the frequency of the idler signal light is equal to the frequency of the target signal light subtracted by twice the frequency of the pump signal light, and the frequency of the auxiliary signal light is half of the sum of the frequency of the idler signal light and the frequency of the pump signal light.
2. The method of claim 1, wherein prior to said coupling the target signal light and the probe signal light, the method further comprises:
judging whether the power value of the target signal light is smaller than a preset power value;
if yes, amplifying the power value of the target signal light to the preset power value.
3. The method of claim 1 or 2, wherein prior to said coupling the target signal light and the probe signal light, the method further comprises: and equally dividing the power of the target signal light and the power of the detection signal light to an X axis and a Y axis.
4. The method according to claim 1, wherein the step of generating the pump signal light and the auxiliary signal light according to the frequency of the target signal light includes:
determining a first frequency of the pumping signal light according to the frequency of the target signal light;
generating pumping signal light with the frequency of the first frequency;
calculating the frequency of the idler frequency light according to the frequency of the target signal light and the first frequency of the pumping signal light;
determining a second frequency of the auxiliary signal light according to the first frequency of the pump signal light and the frequency of the idler signal light;
and generating auxiliary signal light with the frequency of the second frequency.
5. The method of claim 1, wherein the step of obtaining a polarization mode dispersion value of the fiber optic communication system based on the target power difference value comprises:
searching a polarization mode dispersion value corresponding to the target power difference value from a preset relation curve graph of the power difference value and the polarization mode dispersion value, and determining the searched polarization mode dispersion value as the polarization mode dispersion value of the optical fiber communication system; or,
and substituting the target power difference value into a function relation expression of a preset power difference value and a polarization mode dispersion value to obtain a calculation result, and determining the obtained calculation result as the polarization mode dispersion value corresponding to the optical fiber communication system.
6. A polarization mode dispersion monitoring device, for use at a receiving end of an optical fiber communication system, the device comprising:
the target signal light filtering module is used for filtering out target signal light in the signal light to be monitored when a receiving end of the optical fiber communication system receives the signal light to be monitored; wherein the noise of the target signal light is below a predetermined threshold;
a pump signal light and auxiliary signal light generation module, configured to generate a pump signal light and an auxiliary signal light according to a frequency of the target signal light, where the pump signal light and the auxiliary signal light are both narrow-bandwidth and low-power signal lights;
the detection signal light generation module is used for coupling the pumping signal light and the auxiliary signal light to obtain detection signal light;
an idler frequency signal light generating module, configured to couple the target signal light and the detection signal light, and inject the coupled signal light into a high nonlinear optical fiber to generate idler frequency signal light;
a target power difference calculation module, configured to filter out the target signal light and the idler signal light, and calculate a target power difference between the power of the filtered target signal light and the power of the filtered idler signal light;
the polarization mode dispersion value determining module is used for obtaining the polarization mode dispersion value of the optical fiber communication system according to the target power difference value;
the wavelength of the pump signal light is greater than that of the target signal light, the frequency of the idler signal light is equal to the frequency of the target signal light subtracted by twice the frequency of the pump signal light, and the frequency of the auxiliary signal light is half of the sum of the frequency of the idler signal light and the frequency of the pump signal light.
7. An electronic device which is a receiving end of an optical fiber communication system is characterized by comprising a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete mutual communication through the bus,
a memory for storing a computer program;
a processor for implementing the method steps of any one of claims 1 to 5 when executing a program stored in the memory.
8. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of any one of the claims 1-5.
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