CN113036591B - Spectrum shaping method for ultra-long distance optical communication system - Google Patents
Spectrum shaping method for ultra-long distance optical communication system Download PDFInfo
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Abstract
The invention discloses a method for shaping a spectrum of an ultra-long distance optical communication system, which relates to the technical field of optical communication and comprises the following steps: collecting system parameters and input signal spectrums of the ultra-long distance optical communication system; collecting a first output signal spectrum of the ultra-long distance optical communication system, wherein the first output signal spectrum comprises a first output signal optical signal-to-noise ratio; comparing the optical signal-to-noise ratio of the first output signal with a preset optical signal-to-noise ratio, confirming a spectrum deformation mechanism, and performing spectrum shaping on the spectrum of the first output signal to obtain the spectrum width of the output signal; designing the bandwidth of a filter according to the spectral width of an output signal, and placing the filter in an optical power amplifier at the output end of the super-long-distance optical communication system; the spectrum shaping method has the advantages of inhibiting spectrum shoulders, improving the optical signal-to-noise ratio of output signals, and being simultaneously applied to a single-wave transmission system and a wavelength division multiplexing transmission system.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a spectral shaping method of an ultra-long distance optical communication system.
Background
The ultra-long-distance optical fiber communication is a mature technology, and the synchronous digital hierarchy technology is widely applied to the ultra-long-distance optical communication transmission network at present. With the increase of social demands and the vigorous development of 5G technology, the requirements on the capacity of the optical communication transmission system and the transmission distance of the electroless relay are higher, the single-channel fiber-incoming power is higher, and the nonlinear effect in the optical fiber has a greater and greater influence on the optical transmission system. How to optimize the negative effects of these non-linear effects on the optical transmission system is therefore of great significance for the optimal design of the system.
The four-wave mixing effect is an important third-order nonlinear effect, a new optical field can be generated, signal power loss is caused, and the effect is particularly obvious under high transmission power, so that the transmission capacity and the transmission power of the super-long distance optical transmission system are greatly limited. Research shows that in a single-channel optical communication transmission system, the phase matching of an in-band signal and a modulation signal can generate a degenerate four-wave mixing effect, and an obvious spectrum shoulder is observed in a spectrum at the output end of the optical transmission system, which is particularly obvious in high transmission power, and an output end detector can judge that the spectrum shoulder level is a noise level, so that the optical signal-to-noise ratio of the output end is greatly reduced, and the electroless relay transmission distance of the optical communication system is further remarkably reduced.
Disclosure of Invention
The invention provides a method for shaping a spectrum of a super-long distance optical communication system aiming at the problems and the technical requirements, and the technical scheme of the invention is as follows:
a method for shaping the spectrum of an ultra-long distance optical communication system comprises the following steps:
collecting a first output signal spectrum of the ultra-long distance optical communication system, wherein the first output signal spectrum comprises a first output signal optical signal-to-noise ratio;
comparing the optical signal-to-noise ratio of the first output signal with a preset optical signal-to-noise ratio, and if the optical signal-to-noise ratio of the first output signal is lower than the preset optical signal-to-noise ratio, performing spectrum shaping on the spectrum of the first output signal to obtain the spectrum width of the output signal;
the bandwidth of the filter is designed according to the spectrum width of the output signal, and the filter is arranged in an optical power amplifier at the output end of the super-long-distance optical communication system.
The further technical scheme is that the spectrum shaping is carried out on the spectrum of the first output signal to obtain the spectrum width of the output signal, and the method comprises the following steps:
collecting an input signal spectrum of the ultra-long distance optical communication system, wherein the input signal spectrum comprises input signal spectrum characteristics, and the input signal spectrum characteristics comprise an input signal spectrum shape and peak power thereof; the first output signal spectrum also comprises output signal spectrum characteristics, and the output signal spectrum characteristics comprise an output signal spectrum shape and peak power thereof;
and if the spectral shape of the output signal is the same as that of the input signal, taking the spectral width at the position where the spectral peak power of the output signal is reduced by 3dB as the spectral width of the output signal.
The further technical scheme is that the spectrum shaping is carried out on the spectrum of the first output signal to obtain the spectrum width of the output signal, and the method further comprises the following steps:
collecting system parameters of the super-long distance optical communication system, wherein the system parameters comprise optical fiber length, optical fiber loss coefficient, optical fiber refractive index, input signal power and input signal center wavelength;
if the spectrum shape of the output signal spectrum has a significant spectrum shoulder compared with the spectrum shape of the input signal spectrum, firstly, utilizing system parameters to simulate and calculate the four-wave mixing optical spectrum generated by original signal light and modulated light at the output end of the ultra-long distance optical communication system in numerical simulation software based on an in-band degenerate four-wave mixing effect theory; secondly, mixing the original signal light, the modulated light and the four-wave mixed light spectrum to form a second output signal spectrum, and then performing numerical fitting on the second output signal spectrum and the first output signal spectrum by adjusting key simulation parameters of the original signal light, the modulated light and the four-wave mixed light spectrum, wherein the key simulation parameters comprise signal light power, signal spectrum width, modulated light power and modulated spectrum width; and finally, the spectral width of the original signal spectrum after fitting, which is obtained by subtracting 3dB from the peak power, is taken as the spectral width of the output signal.
The method further comprises the following steps of before the step of comparing the optical signal to noise ratio of the first output signal with the preset optical signal to noise ratio, determining the value of the optical signal to noise ratio of the first output signal:
when the spectral shape of the output signal is compared with the spectral shape of the input signal and no obvious spectral shoulder appears, the optical signal to noise ratio of the first output signal is the proportion of the spectral peak power of the output signal to the power of the noise signal;
when the spectral shape of the output signal is obvious in spectral shoulder compared with the spectral shape of the input signal, the optical signal to noise ratio of the first output signal is the ratio of the spectral peak power of the output signal to the spectral shoulder power.
The further technical scheme is that the method also comprises the following steps of verifying the spectrum shaping effect:
collecting a third output signal spectrum output by the optical power amplifier, wherein the third output signal spectrum comprises a third output signal optical signal-to-noise ratio;
and comparing the optical signal-to-noise ratio of the third output signal with a preset optical signal-to-noise ratio to judge the shaping effect.
The further technical scheme is that the third output signal optical signal-to-noise ratio is compared with a preset optical signal-to-noise ratio to judge the shaping effect, and the method comprises the following steps:
and if the optical signal-to-noise ratio of the third output signal is higher than the preset optical signal-to-noise ratio, determining that the optical signal-to-noise ratio of the output signal is increased, and taking the difference value between the optical signal-to-noise ratio of the third output signal and the preset optical signal-to-noise ratio as a theoretical parameter for increasing the maximum unrepeatered transmission distance of the ultra-long distance optical communication system, wherein Δ L is the increased transmission distance, Δ OSNR is the optical signal-to-noise ratio difference value, and α is an optical fiber loss coefficient.
The further technical scheme is that the third output signal optical signal-to-noise ratio is compared with a preset optical signal-to-noise ratio to judge the shaping effect, and the method further comprises the following steps:
and if the optical signal-to-noise ratio of the third output signal is lower than the preset optical signal-to-noise ratio, determining that the power of the output signal is too low, and the conduction of the super-long distance optical communication system cannot be realized through spectral shaping.
The filter is a band-pass filter, and the band-pass filter is applied to an optical power amplifier at the output end of a single-wavelength ultra-long distance optical communication system and a wavelength division multiplexing ultra-long distance optical communication system.
The beneficial technical effects of the invention are as follows:
the method judges whether the spectrum shaping is needed or not by comparing the optical signal to noise ratio of the first output signal with the preset optical signal to noise ratio, in the process of spectrum shaping, whether the spectrum shape of the output signal is the same as that of the input signal is compared, and then the bandwidth of a filter is designed according to two conditions, the influence of the occurrence of a signal spectrum shoulder caused by in-band four-wave mixing effect on the optical signal to noise ratio of the over-long-distance optical communication system is filtered and restrained, so that the unrepeatered transmission distance of the over-long-distance optical communication system is increased, when the spectrum shaping effect is good, the difference value of the optical signal to noise ratio of the third output signal and the preset optical signal to noise ratio is used as a theoretical parameter for increasing the maximum unrepeatered transmission distance of the over-long-distance optical communication system, and a theoretical basis is provided for subsequent experimental operation.
Drawings
FIG. 1 is a flowchart of the overall method provided by the present application.
Fig. 2 is a detailed flowchart of the spectrum shaping in S300 provided herein.
Fig. 3 is a graph showing the effect of spectral shaping provided in example 1 of the present application.
Fig. 4 is a graph showing the effect of spectral shaping provided in example 2 of the present application.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
Referring to fig. 1 and fig. 2, the present application discloses a method for shaping a spectrum of an ultra-long distance optical communication system, which specifically includes the following steps:
step 100: and collecting system parameters and input signal spectrums of the ultra-long distance optical communication system.
The system parameters comprise optical fiber length, optical fiber loss coefficient, optical fiber refractive index, input signal power and input signal center wavelength;
the input signal spectrum comprises an input signal optical signal-to-noise ratio and input signal spectral characteristics, wherein the input signal spectral characteristics comprise an input signal spectral shape and peak power thereof.
Step 200: the method comprises the steps of collecting a first output signal spectrum of the ultra-long distance optical communication system, and determining a value of an optical signal-to-noise ratio of a first output signal of the first output signal spectrum.
The first output signal spectrum comprises a first output signal optical signal-to-noise ratio and output signal spectral characteristics, and the output signal spectral characteristics comprise an output signal spectral shape and peak power thereof.
When the spectral shape of the output signal is compared with the spectral shape of the input signal and no obvious spectral shoulder appears, the optical signal to noise ratio of the first output signal is the proportion of the spectral peak power of the output signal to the power of the noise signal;
when the spectral shape of the output signal is obvious in spectral shoulder compared with the spectral shape of the input signal, the optical signal to noise ratio of the first output signal is the ratio of the spectral peak power of the output signal to the spectral shoulder power.
Step 300: comparing the optical signal-to-noise ratio of the first output signal with a preset optical signal-to-noise ratio, and if the optical signal-to-noise ratio of the first output signal is lower than the preset optical signal-to-noise ratio, performing spectrum shaping on the spectrum of the first output signal to obtain the spectrum width of the output signal; and if the optical signal-to-noise ratio of the first output signal is higher than the preset optical signal-to-noise ratio, determining that the spectrum shaping is not needed.
Further, performing spectrum shaping on the first output signal spectrum to obtain an output signal spectrum width, including comparing the output signal spectrum shape with the input signal spectrum shape:
the method specifically comprises the following steps:
step 301: if the output signal spectrum shape is the same as the input signal spectrum shape, the spectrum width at the position where the output signal spectrum peak power is reduced by 3dB is taken as the output signal spectrum width, and the step 400 is entered.
Step 302: if the spectrum shape of the output signal spectrum has a significant spectrum shoulder compared with the spectrum shape of the input signal spectrum, firstly, the four-wave mixing optical spectrum generated by the original signal light and the modulated light at the output end of the ultra-long distance optical communication system is simulated and calculated in numerical simulation software by utilizing system parameters based on the theory of the in-band degenerate four-wave mixing effect. And then, performing numerical fitting on the second output signal spectrum and the first output signal spectrum by adjusting key simulation parameters of the original signal light, the modulated light and the four-wave mixed light spectrum, even if the second output signal spectrum is overlapped with the first output signal spectrum, wherein the key simulation parameters comprise signal light power, signal spectrum width, modulated light power and modulated spectrum width. And finally, the spectral width of the original signal spectrum with the peak power reduced by 3dB after fitting is taken as the spectral width of an output signal, and the step 400 is carried out.
Step 400: the bandwidth of the filter is designed according to the spectrum width of the output signal, and the filter is arranged in an optical power amplifier at the output end of the super-long-distance optical communication system.
Optionally, the filter is a band-pass filter, and the band-pass filter can be applied to an optical power amplifier at the output end of a single-wavelength ultra-long distance optical communication system and a wavelength division multiplexing ultra-long distance optical communication system, and filters and inhibits the influence of the occurrence of a signal spectrum shoulder caused by an in-band four-wave mixing effect on the optical signal-to-noise ratio of the ultra-long distance optical communication system, so that the unrepeatered transmission distance of the ultra-long distance optical communication system is increased.
Step 500: verifying spectral shaping effects, including:
step 501: and collecting a third output signal spectrum output by the optical power amplifier, wherein the third output signal spectrum comprises a third output signal optical signal-to-noise ratio and a third output signal spectral characteristic.
Step 502: comparing the optical signal-to-noise ratio of the third output signal with a preset optical signal-to-noise ratio to judge the shaping effect, specifically comprising:
step 521: and if the optical signal-to-noise ratio of the third output signal is higher than the preset optical signal-to-noise ratio, determining that the optical signal-to-noise ratio of the output signal is increased, and taking the difference value between the optical signal-to-noise ratio of the third output signal and the preset optical signal-to-noise ratio as a theoretical parameter for increasing the maximum unrepeatered transmission distance of the ultra-long distance optical communication system, wherein the theoretical parameter can provide a theoretical basis for subsequent experimental operation, and Δ L is Δ OSNR/α, wherein Δ L is the increased transmission distance, Δ OSNR is the optical signal-to-noise ratio difference value, and α is an optical fiber loss coefficient.
Step 522: and if the optical signal-to-noise ratio of the third output signal is lower than the preset optical signal-to-noise ratio, determining that the power of the output signal is too low, and the conduction of the super-long distance optical communication system cannot be realized through spectral shaping.
In order to verify the feasibility of the above spectral shaping method, the present application provides the following two embodiments, respectively:
example 1: the preset optical signal to noise ratio is set to be 12dB, the optical signal to noise ratio of the first output signal collected in step 200 is set to be 6dB, the value is smaller than the preset optical signal to noise ratio, the spectrum shape of the output signal is compared with the spectrum shape of the input signal, no spectrum shoulder phenomenon occurs, and at the moment, the signal spectrum width in the first output signal spectrum is read to be 0.5 nm. Therefore, a 0.5nm band-pass filter is designed and additionally arranged in the output end optical power amplifier for spectrum shaping, the output signal spectrum before and after shaping is shown in fig. 3, and the optical signal-to-noise ratio of the shaped third output signal is 12dB, so that the preset optical signal-to-noise ratio is achieved.
Example 2: the preset optical signal to noise ratio is set to be 12dB, the optical signal to noise ratio of the first output signal collected in the step 200 is set to be 7dB, the value is smaller than the preset optical signal to noise ratio, the spectrum shape of the output signal spectrum is compared with the spectrum shape of the input signal spectrum, a spectrum shoulder phenomenon occurs, at the moment, numerical fitting is carried out on the second output signal spectrum obtained through simulation and the first output signal spectrum based on an in-band degenerate four-wave mixing effect theory, and the spectrum width of the output signal is calculated to be 0.3 nm. Therefore, a 0.3nm band-pass filter is designed and additionally arranged in the output end optical power amplifier for spectrum shaping, the output signal spectrum before and after shaping is shown in fig. 4, and the optical signal-to-noise ratio of the shaped third output signal is 20dB and is greater than the preset optical signal-to-noise ratio.
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (6)
1. A method for spectral shaping in an ultra-long range optical communication system, the method comprising:
collecting system parameters and an input signal spectrum of an ultra-long distance optical communication system, wherein the system parameters comprise optical fiber length, optical fiber loss coefficient, optical fiber refractive index, input signal power and input signal center wavelength, the input signal spectrum comprises input signal spectrum characteristics, and the input signal spectrum characteristics comprise input signal spectrum shape and peak power thereof;
collecting a first output signal spectrum of the super-long-distance optical communication system, wherein the first output signal spectrum comprises a first output signal optical signal-to-noise ratio and output signal spectral characteristics, and the output signal spectral characteristics comprise an output signal spectral shape and peak power thereof;
comparing the optical signal-to-noise ratio of the first output signal with a preset optical signal-to-noise ratio, and if the optical signal-to-noise ratio of the first output signal is lower than the preset optical signal-to-noise ratio, performing spectrum shaping on the spectrum of the first output signal to obtain the spectrum width of the output signal, including: if the output signal spectrum shape is the same as the input signal spectrum shape, taking the spectrum width of the position where the output signal spectrum peak power is reduced by 3dB as the output signal spectrum width; if the spectrum shape of the output signal spectrum has a significant spectrum shoulder compared with the spectrum shape of the input signal spectrum, firstly, utilizing the system parameters to simulate and calculate the four-wave mixing light spectrum generated by original signal light and modulated light at the output end of the ultra-long distance optical communication system in numerical simulation software based on an in-band degenerate four-wave mixing effect theory; secondly, mixing the original signal light, the modulated light and the four-wave mixed light spectrum to form a second output signal spectrum, and then performing numerical value fitting on the second output signal spectrum and the first output signal spectrum by adjusting key simulation parameters of the original signal light, the modulated light and the four-wave mixed light spectrum, wherein the key simulation parameters comprise signal light power, signal spectrum width, modulated light power and modulated spectrum width; finally, the spectral width of the original signal spectrum peak power after fitting minus 3dB is taken as the spectral width of the output signal;
and designing the bandwidth of a filter according to the spectral width of the output signal, and placing the filter in an optical power amplifier at the output end of the ultra-long distance optical communication system.
2. The method of claim 1, wherein prior to the step of comparing the first output signal osnr to a predetermined osnr, the method further comprises determining a value of the first output signal osnr:
when the spectral shape of the output signal is compared with the spectral shape of the input signal without a significant spectral shoulder, the optical signal-to-noise ratio of the first output signal is the ratio of the spectral peak power of the output signal to the power of a noise signal;
and when the spectral shape of the output signal is more significant than the spectral shape of the input signal, the optical signal-to-noise ratio of the first output signal is the ratio of the spectral peak power of the output signal to the spectral shoulder power.
3. The method of spectral shaping in an ultra-long range optical communication system of claim 1 or 2, wherein the method further comprises verifying the spectral shaping effect:
collecting a third output signal spectrum output by the optical power amplifier, wherein the third output signal spectrum comprises a third output signal optical signal-to-noise ratio;
and comparing the optical signal-to-noise ratio of the third output signal with a preset optical signal-to-noise ratio to judge the shaping effect.
4. The method for spectral shaping in an ultra-long distance optical communication system according to claim 3, wherein the comparing the osnr of the third output signal with the predetermined osnr to determine the shaping effect comprises:
and if the optical signal-to-noise ratio of the third output signal is higher than the preset optical signal-to-noise ratio, determining that the optical signal-to-noise ratio of the output signal is increased, and taking the difference value between the optical signal-to-noise ratio of the third output signal and the preset optical signal-to-noise ratio as a theoretical parameter for increasing the maximum unrepeatered transmission distance of the ultra-long distance optical communication system, wherein Δ L is an increased transmission distance, Δ OSNR is an optical signal-to-noise ratio difference value, and α is an optical fiber loss coefficient.
5. The method of claim 3, wherein the comparing the third output signal osnr with a predetermined osnr determines the shaping effect, further comprising:
and if the optical signal-to-noise ratio of the third output signal is lower than the preset optical signal-to-noise ratio, determining that the output signal power is too low, and the conduction of the ultra-long distance optical communication system cannot be realized through spectral shaping.
6. The method of claim 1, wherein the filter is a band-pass filter, and the band-pass filter is applied to an optical power amplifier at an output of the single wavelength extra-long distance optical communication system and the wavelength division multiplexing extra-long distance optical communication system.
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