Optical communication system based on cascade IFFT / FFT multi-channel aggregation and deaggregation

Abstract

The invention relates to the technical field of optical communication, in particular to an optical communication system based on cascade IFFT / FFT multi-channel aggregation and deaggregation. The device comprises an optical signal conversion module and an optical signal modulation module. According to the invention, the optical signal conversion module converts a time domain signal into a frequency domain signal by using IFFT according to the requirements of a receiving end and a sending end, converts the frequency domain signal into a time domain signal by using FFT, and feeds back the time domain signal to the optical signal modulation module for aggregation and deaggregation processing; the optical signal modulation module plans the aggregation transmission sequence of each optical signal according to the priority of the expression item, and in the process that the receiving end receives each optical signal, because each optical signal is determined according to the priority of the expression item, the corresponding deaggregation sequence is also determined according to the priority, so that the post-processing steps are reduced, and the processing efficiency is improved. And the classification processing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the field of optical communication technology, and in particular to an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation. Background Art

[0002] Optical communication system is a communication method that uses optical signals to transmit information. It uses optical fiber as the transmission medium to transmit information from one place to another. The basic components of an optical communication system include optical transmitters, communication channels, and optical receivers. The optical transmitter converts electrical signals into optical signals and transmits the resulting optical signals to the optical fiber. The optical receiver converts the optical signals output by the optical fiber back into electrical signals.

[0003] During the transmission of optical signals, multiple processing steps are required to ensure the normal transmission of optical signals. First, since there are multiple optical signals transmitted each time, if a single channel transmission method is used, the corresponding channel volume is relatively large and the transmission efficiency is low. Therefore, it is necessary to adopt the channel aggregation and deaggregation method. During transmission, optical signals of different wavelengths are aggregated into the same optical fiber for transmission. During reception, the optical signals in the same optical fiber are separated again by deaggregation, thereby improving the transmission efficiency. At the same time, in optical communications, time domain signals and frequency domain signals are the two main ways to analyze and process optical signals. The time domain signal describes the change of the optical signal over time, while the frequency domain signal describes the distribution of the optical signal at different frequencies. During transmission, in order to facilitate optical signal analysis and distinguish different optical signals, the time domain signal and the frequency domain signal need to be converted to each other through IFFT / FFT. For example, at the receiving end, the received optical signal may be affected by factors such as dispersion, resulting in distortion of the time domain signal. By converting the time domain signal into the frequency domain signal, the attenuation of the signal at different frequencies can be analyzed, and then corresponding compensation measures can be taken. Although the existing optical signal transmission can achieve high-speed transmission, during the optical signal aggregation process, multiple optical signals are randomly aggregated into the same optical fiber, and are re-distinguished by deaggregation after reaching the receiving end. At this time, in order to obtain the attenuation of each optical signal during the transmission process and the expression status of each optical signal (for example, the shape, duration, interval and other information of the optical pulse), multiple time domain signal and frequency domain signal conversion operations are required, which is not conducive to the classification processing work at the receiving end.

[0004] In order to address the above problems, an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation is urgently needed. Summary of the invention

[0005] The object of the present invention is to provide an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation is provided, comprising an optical signal transmitting end processing platform, an optical signal modulation module, an optical signal conversion module and a receiving end optical signal processing platform;

[0007] The optical signal sending end processing platform is used to collect the content of each optical signal to be sent and obtain the corresponding expression item;

[0008] The optical signal modulation module is used to aggregate and deaggregate multiple optical signals. At the transmitting end, multiple optical signals with different wavelengths are aggregated into the same optical fiber for transmission by channel aggregation, and at the receiving end, optical signals with different wavelengths are separated again by deaggregation.

[0009] The optical signal conversion module converts the time domain signal into the frequency domain signal using IFFT and converts the frequency domain signal into the time domain signal using FFT according to the requirements of the receiving end and the transmitting end, and feeds back to the optical signal modulation module for aggregation and deaggregation processing;

[0010] The receiving end optical signal processing platform is used to obtain the optical signal processing content of the receiving end, update the priority of the expression items of each optical signal in combination with the optical signal processing content, and feed back the updated priority of the expression item to the optical signal modulation module. The optical signal modulation module plans the order of aggregation transmission of each optical signal according to the priority of the expression item.

[0011] As a further improvement of the present technical solution, the optical signal sending end processing platform includes an optical signal analysis module and an optical signal expression project marking module. The optical signal analysis module is used to collect the information content of the optical signal, and the optical signal expression project marking module combines the information content of the optical signal to obtain the expression items of each optical signal and obtain the corresponding numerical values.

[0012] As a further improvement of the present technical solution, the expression items in the optical signal expression item marking module include the shape, duration and interval of the optical pulses in the time domain signal, the distribution of the optical signal at different frequencies, and the spectrum width, spectrum shape, center frequency and sideband frequency of the optical signal.

[0013] As a further improvement of the technical solution, the optical signal modulation module uses a link aggregation control protocol to plan the order of aggregation transmission of each optical signal according to the priority of the expression project, and the specific steps are as follows:

[0014] S301, configuring interfaces for different optical signals at the receiving end, marked as receiving end matching interfaces;

[0015] S302, according to the priority of the expression items of each optical signal updated by the receiving end, obtaining the LACP priority of the corresponding receiving end matching interface;

[0016] S303: Set a matching relationship between the LACP priority value of the receiving end matching interface and the receiving sequence.

[0017] As a further improvement of the present technical solution, the optical signal conversion module includes an expression item simulation unit, an expression item numerical marking unit and a pre-transmission sequence planning unit. The expression item simulation unit shows the corresponding expression items through a simulation chart according to the contents of each expression item. The expression item numerical marking unit obtains the numerical value of each expression item according to the simulation content of the simulation chart. The pre-transmission sequence planning unit matches the pre-transmission sequence of different optical signals according to different expression item numerical values ​​based on the expression item numerical values.

[0018] As a further improvement of the technical solution, the method for matching the pre-transmission order of different optical signals according to different expression item values ​​in the pre-transmission order planning unit comprises the following steps:

[0019] S4301, obtain the expression item quantity Ex quantity , according to the expression item quantity Ex quantity Establish corresponding expression item sequence storage package;

[0020] S4302, performing naming processing on the expression item sequence storage package according to the storage content of the expression item sequence storage package;

[0021] S4303. Store the corresponding pre-transmission sequence by storing the packages in different expression item sequences.

[0022] As a further improvement of the present technical solution, the receiving end optical signal processing platform includes an optical signal processing content definition module and an expression item priority update module. The optical signal processing content definition module is used to obtain the content to be processed at the receiving end. The expression item priority update module combines the content to be processed at the receiving end, performs real-time updates on the priority of each expression item, and updates the priority of the corresponding matching interface.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] In the optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation, the optical signal conversion module uses IFFT to convert the time domain signal into a frequency domain signal according to the needs of the receiving end and the transmitting end, and uses FFT to convert the frequency domain signal into a time domain signal, and feeds back to the optical signal modulation module for aggregation and deaggregation processing. The optical signal modulation module plans the order of aggregation transmission of each optical signal according to the priority of the expression project. In the process of receiving each optical signal at the receiving end, since each optical signal is determined by the priority of the expression project, the corresponding deaggregation order is also determined according to the priority, thereby reducing the post-processing steps and improving the classification processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic block diagram of the overall structure of the present invention;

[0026] Figure 2 It is a schematic block diagram of the structure of the optical signal conversion module of the present invention.

[0027] The meaning of each number in the figure is:

[0028] 10. Optical signal analysis module;

[0029] 20. Light signal expression project marking module;

[0030] 30. Optical signal modulation module;

[0031] 40. Optical signal conversion module; 410. Expression item simulation unit; 420. Expression item value marking unit; 430. Pre-transmission sequence planning unit;

[0032] 50. Optical signal processing content definition module;

[0033] 60. Express project priority update module. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1 As shown, an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation is provided, including an optical signal transmitting end processing platform, an optical signal modulation module 30, an optical signal conversion module 40 and a receiving end optical signal processing platform;

[0036] The optical signal sending end processing platform is used to collect the content of each optical signal to be sent and obtain the corresponding expression item;

[0037] The optical signal modulation module 30 is used to aggregate and deaggregate multiple optical signals. At the transmitting end, multiple optical signals with different wavelengths ( Figure 1 Signals a1-a5) are aggregated into the same optical fiber ( Figure 1 The optical signals in a) are transmitted, and at the receiving end, the optical signals of different wavelengths are separated again by de-aggregation;

[0038] The optical signal conversion module 40 converts the time domain signal into the frequency domain signal using IFFT and converts the frequency domain signal into the time domain signal using FFT according to the requirements of the receiving end and the transmitting end, and feeds back to the optical signal modulation module 30 for aggregation and deaggregation processing;

[0039] The optical signal processing platform at the receiving end is used to obtain the optical signal processing content at the receiving end, update the priority of the expression items of each optical signal in combination with the optical signal processing content, and feed back the updated priority of the expression item to the optical signal modulation module 30. The optical signal modulation module 30 plans the order of aggregation transmission of each optical signal according to the priority of the expression item.

[0040] When used specifically, during the optical signal transmission process, the optical signal transmitter processing platform first collects the content of each optical signal to be sent, and obtains the corresponding expression items, such as the shape, duration and interval of the optical pulse in the time domain signal, and the distribution of the optical signal at different frequencies in the frequency domain signal. These are all expression items of the optical signal, which serve as a reference for the identification of the optical signal and the subsequent matching of the receiving end;

[0041] In order to ensure the transmission speed, during transmission, the optical signal modulation module 30 is used to aggregate and deaggregate multiple optical signals. At the transmitting end, multiple optical signals of different wavelengths are aggregated into the same optical fiber for transmission by channel aggregation. At the receiving end, the optical signals of different wavelengths are separated again by deaggregation. At the same time, in order to facilitate the optical signal classification processing at the receiving end, it is necessary to obtain the optical signal processing requirements of the receiving end in advance before aggregation. At this time, it is necessary to obtain the optical signal processing content of the receiving end through the optical signal processing platform of the receiving end, and update the priority of the expression items of each optical signal in combination with the optical signal processing content, and feed back the priority of the updated expression items to the optical signal modulation module 30. The signals embodied by the projects are different, so it is necessary to determine the expression project in the process of converting the time domain signal and the frequency domain signal, that is, through the optical signal conversion module 40, according to the needs of the receiving end and the transmitting end, the time domain signal is converted into the frequency domain signal by IFFT, and the frequency domain signal is converted into the time domain signal by FFT, and the feedback is sent to the optical signal modulation module 30 for aggregation and deaggregation processing. The optical signal modulation module 30 plans the order of aggregation transmission of each optical signal according to the priority of the expression project. Therefore, in the process of receiving each optical signal at the receiving end, since each optical signal is determined by the priority of the expression project, the corresponding deaggregation order is also determined according to the priority, thereby reducing the post-processing steps and improving the classification processing efficiency.

[0042] In addition, the optical signal sending end processing platform includes an optical signal analysis module 10 and an optical signal expression project marking module 20. The optical signal analysis module 10 is used to collect the information content of the optical signal. The optical signal expression project marking module 20 combines the information content of the optical signal to obtain the expression items of each optical signal and obtain the corresponding numerical values.

[0043] Furthermore, the expression items in the optical signal expression item marking module 20 include the shape, duration and interval of the optical pulses in the time domain signal, the distribution of the optical signal at different frequencies, and the spectrum width, spectrum shape, center frequency and sideband frequency of the optical signal.

[0044] In specific use, during the optical signal transmission process, in order to perform classification processing later, it is first necessary to collect the information content of the optical signal through the optical signal analysis module 10, such as the number and type of optical signals to be transmitted, and then obtain the expression items of each optical signal and the corresponding numerical value by combining the information content of the optical signal through the optical signal expression item marking module 20. The expression items involved in the present invention include the shape, duration and interval of the optical pulse in the time domain signal, and also include the distribution of the optical signal at different frequencies, that is, the distribution of the optical signal at different frequencies, which can be represented by the frequency domain signal, and finally include the spectrum characteristics of the corresponding optical signal, that is, the spectrum width of the optical signal (the spectrum width of the optical signal refers to the distribution range of the signal in the frequency domain), the spectrum shape (the spectrum shape of the optical signal can be Gaussian, Lorentz or other complex shapes), the center frequency (the center frequency of the optical signal refers to the center position of the spectrum distribution. In the wavelength division multiplexing system, optical signals of different wavelengths have different center frequencies, and these signals can be transmitted in the same optical fiber without interfering with each other) and the sideband frequency (in the modulation process, the optical signal will generate sideband frequencies, and these sideband frequencies contain information of the modulation signal), which are all used as expression items in the current optical signal transmission process;

[0045] Since different expression items have different corresponding expressions, for example, the shape, duration and interval of the optical pulse are represented by the time domain signal, while the distribution of the optical signal at different frequencies is represented by the frequency domain signal, and in most cases it is transmitted in the form of a frequency domain signal during transmission, therefore when classifying the expression items to adapt to different processing requirements, for example, during signal debugging, it is necessary to analyze according to the duration of the optical pulse, and the duration of the corresponding optical pulse is the target expression item, which has the highest priority at the receiving end. Before the optical signal is sent at the transmitting end, the entire optical signal is still represented by the time domain signal, and the duration of the corresponding optical pulse can be intuitively obtained. At this time, the transmission order is divided in the aggregated channel according to the duration of each optical pulse. Even if the optical signal is converted into a frequency domain signal (this is because in most cases, due to the dispersion characteristics of the optical fiber, optical signals of different frequencies will propagate at different speeds, causing the time domain signal to be broadened or distorted. At the receiving end, the received time domain signal can be converted into a frequency domain signal, and the changes in the signal at different frequencies can be analyzed, so that corresponding measures can be taken to restore the original time domain signal and improve the transmission quality of the signal), the corresponding deaggregation order is still the order when sending, and the analysis and processing can be performed through the frequency domain signal without the need for secondary conversion of the optical signal, thereby reducing the frequency of optical signal conversion.

[0046] Furthermore, the optical signal modulation module 30 uses a link aggregation control protocol to plan the order of aggregation transmission of each optical signal according to the priority of the expression project, and the specific steps are as follows:

[0047] S301, configuring interfaces for different optical signals at the receiving end, marked as receiving end matching interfaces;

[0048] S302, according to the priority of the expression items of each optical signal updated by the receiving end, obtaining the LACP priority of the corresponding receiving end matching interface;

[0049] S303: Set a matching relationship between the LACP priority value of the receiving end matching interface and the receiving sequence.

[0050] During specific use, during the transmission sequence planning of the optical signal, since it is necessary to match the processing requirements of the receiving end, it is necessary to configure according to the priority of the expression items of each optical signal updated by the receiving end. The present invention adopts a link aggregation control protocol. First, interfaces are configured for different optical signals at the receiving end, which are marked as receiving end matching interfaces. Under the link aggregation control protocol, according to the priority of the expression items of each optical signal updated by the receiving end, the LACP priority of the corresponding receiving end matching interface is obtained, and the receiving end matching interface is set to an active interface and a backup interface according to the LACP priority, and the matching relationship between the LACP priority value of the receiving end matching interface and the receiving order is set, wherein the higher the LACP priority value, the lower the corresponding transmission priority, the optical signal with a lower priority matches the backup interface, and the optical signal with a higher priority matches the active interface, and the specific matching method is determined by the actual number of optical signals.

[0051] Specifically, Figure 2 As shown, the optical signal conversion module 40 includes an expression item simulation unit 410, an expression item value marking unit 420 and a pre-transmission sequence planning unit 430. The expression item simulation unit 410 shows the corresponding expression items through a simulation chart according to the contents of each expression item. The expression item value marking unit 420 obtains the value of each expression item according to the simulation content of the simulation chart. The pre-transmission sequence planning unit 430 matches the pre-transmission sequence of different optical signals according to different expression item values ​​based on the expression item values.

[0052] In addition, the method for matching the pre-transmission order of different optical signals according to different expression item values ​​in the pre-transmission order planning unit 430 includes the following steps:

[0053] S4301, obtain the expression item quantity Ex quantity , according to the expression item quantity Ex quantity Establish corresponding expression item sequence storage package;

[0054] S4302, performing naming processing on the expression item sequence storage package according to the storage content of the expression item sequence storage package;

[0055] S4303. Store the corresponding pre-transmission sequence by storing the packages in different expression item sequences.

[0056] In specific use, in order to facilitate the determination of expression items in the later stage, it is necessary to determine the expression item values ​​before and after the conversion of frequency domain signals and time domain signals. First, the expression item simulation unit 410 uses a simulation chart to show the corresponding expression items according to the contents of each expression item, such as a corresponding waveform chart. The waveform chart shows the numerical changes of each expression item in the process of different changes in the amount of change. The expression item value marking unit 420 obtains the value of each expression item according to the simulation content of the simulation chart as the basis for matching the order of the expression items in the later stage. Finally, the pre-transmission sequence planning unit 430 performs pre-transmission sequence of different optical signals according to different expression item values ​​based on the expression item values. Match and store them through expression item sequence storage packages, that is, different expression item sequence storage packages store the corresponding transmission orders of each optical signal under different expression item states. During the channel aggregation process, the expression item priority fed back by the receiving end is used to match the expression item that currently needs to be given priority, that is, the expression item with the highest priority, and obtain the corresponding expression item sequence storage package, and directly apply the corresponding storage order as the transmission order for aggregate transmission, so as to perform expression item sequence preprocessing before and after the conversion between the frequency domain signal and the time domain signal, so as to avoid the situation where the corresponding signal type of the selected expression item is over-converted when the expression item is selected, and the corresponding numerical value cannot be reflected, resulting in the need for secondary conversion.

[0057] Furthermore, the receiving end optical signal processing platform includes an optical signal processing content definition module 50 and an expression item priority update module 60. The optical signal processing content definition module 50 is used to obtain the content to be processed at the receiving end. The expression item priority update module 60 combines the content to be processed at the receiving end, performs real-time updates on the priority of each expression item, and updates the priority of the corresponding matching interface. During specific use, during the optical signal processing at the receiving end, in some cases, the corresponding expression item cannot be directly obtained after the optical signal is converted, and a secondary conversion is required later. At the same time, in order to adapt to other processing tasks, for example, the received optical signal may be affected by factors such as dispersion, resulting in distortion of the time domain signal. By converting the time domain signal into a frequency domain signal, the attenuation of the signal at different frequencies can be analyzed, and then corresponding compensation measures can be taken. Re-conversion is required, resulting in redundancy in the conversion work. Therefore, in order to avoid these problems, it is necessary to obtain the content to be processed at the receiving end in advance through the optical signal processing content definition module 50, that is, to obtain the state of the optical signal through different expression items, and match the corresponding processing method. At this time, the expression item priority update module 60 is combined with the content to be processed at the receiving end to update the priority of each expression item in real time, and update the priority of the corresponding matching interface. The optical signal receiving work corresponding to the matching expression item is performed through the corresponding matching interface, and the receiving processing is performed according to the priority order of the matching interface.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation, characterized in that: It comprises an optical signal sending end processing platform, an optical signal modulation module (30), an optical signal conversion module (40) and a receiving end optical signal processing platform; The optical signal sending end processing platform is used to collect the content of each optical signal to be sent and obtain the corresponding expression item; The optical signal modulation module (30) is used to perform aggregation and deaggregation processing on multiple optical signals. At the transmitting end, multiple optical signals with different wavelengths are aggregated into the same optical fiber for transmission by means of channel aggregation, and at the receiving end, the optical signals with different wavelengths are separated again by means of deaggregation. The optical signal conversion module (40) converts the time domain signal into the frequency domain signal using IFFT and converts the frequency domain signal into the time domain signal using FFT according to the requirements of the receiving end and the transmitting end, and feeds back to the optical signal modulation module (30) for aggregation and deaggregation processing; The receiving end optical signal processing platform is used to obtain the optical signal processing content of the receiving end, update the priority of the expression items of each optical signal in combination with the optical signal processing content, and feed back the updated priority of the expression item to the optical signal modulation module (30), and the optical signal modulation module (30) plans the order of aggregate transmission of each optical signal according to the priority of the expression item.

2. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation according to claim 1, characterized in that: The optical signal sending end processing platform comprises an optical signal analysis module (10) and an optical signal expression item marking module (20), wherein the optical signal analysis module (10) is used to collect information content of the optical signal, and the optical signal expression item marking module (20) combines the information content of the optical signal to obtain the expression item of each optical signal and obtain the corresponding numerical value.

3. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation according to claim 2, characterized in that: The expression items in the optical signal expression item marking module (20) include the shape, duration and interval of the optical pulse in the time domain signal, the distribution of the optical signal at different frequencies, and the spectrum width, spectrum shape, center frequency and sideband frequency of the optical signal.

4. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation according to claim 1, characterized in that: The optical signal modulation module (30) uses a link aggregation control protocol to plan the order of aggregation transmission of each optical signal according to the priority of the expression project, and the specific steps are as follows: S301, configuring interfaces for different optical signals at the receiving end, marked as receiving end matching interfaces; S302, according to the priority of the expression items of each optical signal updated by the receiving end, obtaining the LACP priority of the corresponding receiving end matching interface; S303: Set a matching relationship between the LACP priority value of the receiving end matching interface and the receiving sequence.

5. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation according to claim 1, characterized in that: The optical signal conversion module (40) comprises an expression item simulation unit (410), an expression item value marking unit (420) and a pre-transmission sequence planning unit (430), wherein the expression item simulation unit (410) displays the corresponding expression items through a simulation chart according to the contents of each expression item, the expression item value marking unit (420) obtains the values ​​of each expression item according to the simulation content of the simulation chart, and the pre-transmission sequence planning unit (430) matches the pre-transmission sequence of different optical signals according to the expression item values ​​and different expression item values.

6. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation according to claim 5, characterized in that: The method for matching the pre-transmission order of different optical signals according to different expression item values ​​in the pre-transmission order planning unit (430) comprises the following steps: S4301, obtain the expression item quantity Ex quantity , according to the expression item quantity Ex quantity Establish corresponding expression item sequence storage package; S4302, performing naming processing on the expression item sequence storage package according to the storage content of the expression item sequence storage package; S4303. Store the corresponding pre-transmission sequence by storing the packages in different expression item sequences.

7. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation according to claim 1, characterized in that: The receiving end optical signal processing platform comprises an optical signal processing content definition module (50) and an expression item priority update module (60), wherein the optical signal processing content definition module (50) is used to obtain the content to be processed at the receiving end, and the expression item priority update module (60) combines the content to be processed at the receiving end to perform real-time update processing on the priority of each expression item, and updates the priority of the corresponding matching interface.

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