An optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation

Abstract

The application relates to the field of optical communication technology, in particular to an optical communication system based on cascade IFFT / FFT multi-channel aggregation and disaggregation. The application comprises an optical signal conversion module and an optical signal modulation module. The application converts time domain signals into frequency domain signals by IFFT and converts frequency domain signals into time domain signals by FFT according to the requirements of the receiving end and the sending end, and feeds back to the optical signal modulation module for aggregation and disaggregation processing work. The optical signal modulation module plans the order of the aggregation transmission of each optical signal according to the priority of the expression item. In the process of receiving each optical signal at the receiving end, the disaggregation order is determined according to the priority of the expression item, so as to reduce the later processing steps and improve the classification processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of optical communication technology, and more specifically, to an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation. Background Technology

[0002] An 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 an optical transmitter, a communication channel, and an optical receiver. The optical transmitter converts electrical signals into optical signals and transmits the resulting optical signals into the optical fiber. The optical receiver converts the optical signals output from the optical fiber back into electrical signals.

[0003] In optical signal transmission, multiple processing steps are required to ensure normal transmission. Firstly, since multiple optical signals are transmitted each time, using a single-channel transmission method would result in a large number of channels and low transmission efficiency. Therefore, channel aggregation and deaggregation are necessary. During transmission, optical signals of different wavelengths are aggregated into the same optical fiber for transmission. During reception, deaggregation separates the optical signals within the same fiber, thereby improving transmission efficiency. Furthermore, in optical communication, time-domain and frequency-domain signals are the two main methods for analyzing and processing optical signals. Time-domain signals describe the changes of optical signals over time, while frequency-domain signals describe the distribution of optical signals at different frequencies. During transmission, to facilitate optical signal analysis and distinguish different optical signals, IFFT / FFT is used to convert between time-domain and frequency-domain signals. For example, at the receiving end, the received optical signal may be affected by factors such as dispersion, causing distortion in the time-domain signal. By converting time-domain signals into frequency-domain signals, the attenuation of signals at different frequencies can be analyzed, and corresponding compensation measures can be taken. Although 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. After arriving at the receiving end, they are re-distinguished by de-aggregation. At this time, in order to obtain the attenuation of each optical signal during transmission and the expression status of each optical signal (e.g., the shape, duration, and interval of the optical pulse), multiple time-domain and frequency-domain signal conversions are required. This is also not conducive to the classification and processing work at the receiving end.

[0004] To address the aforementioned issues, there is an urgent need for an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation. Summary of the Invention

[0005] The purpose of this invention is to provide an optical communication system based on cascaded IFFT / FFT multi-channel aggregation and deaggregation to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, 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, an optical signal conversion module, and a receiving end optical signal processing platform;

[0007] The optical signal transmitting end processing platform is used to collect the content of each optical signal that needs to be transmitted and obtain the corresponding expression items.

[0008] The optical signal modulation module is used to perform aggregation and deaggregation processing on multiple optical signals. At the transmitting end, multiple optical signals of different wavelengths are aggregated into the same optical fiber for transmission through channel aggregation. At the receiving end, the optical signals of different wavelengths are separated again through deaggregation.

[0009] The optical signal conversion module converts the time-domain signal into a frequency-domain signal using IFFT and the frequency-domain signal into a time-domain signal using FFT, according to the needs of the receiver and transmitter, and feeds it 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 each optical signal expression item 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 and transmission of each optical signal according to the priority of the expression item.

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

[0012] As a further improvement to this technical solution, the expression items in the optical signal expression item marking module 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 spectral width, spectral shape, center frequency and sideband frequency of the optical signal.

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

[0014] S301. Configure interfaces for different optical signals at the receiving end and mark them as receiving end matching interfaces;

[0015] S302. According to the priority of each optical signal expression item updated by the receiver, obtain the LACP priority of the corresponding receiver matching interface;

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

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

[0018] As a further improvement to this 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 includes the following steps:

[0019] S4301, Obtain the number of express items Ex quantity According to the quantity of the expressed item Ex quantity Establish the corresponding sequential storage package for the expression items;

[0020] S4302. Name the sequential storage package of the expression item according to its contents;

[0021] S4303. Store the corresponding pre-transmission order through different expression item sequential storage packages.

[0022] As a further improvement to this 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, and the expression item priority update module, in conjunction with the content to be processed at the receiving end, performs real-time update processing on the priority of each expression item and updates the priority of the corresponding matching interface.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] In this cascaded IFFT / FFT-based multi-channel aggregation and deaggregation optical communication system, the optical signal conversion module converts the time-domain signal into a frequency-domain signal using IFFT and the frequency-domain signal into a time-domain signal using FFT, according to the needs of the receiver and transmitter. This converted signal is then fed back to the optical signal modulation module for aggregation and deaggregation processing. The optical signal modulation module plans the aggregation and transmission order of each optical signal according to the priority of the expressed items. During the reception of each optical signal at the receiver, since the priority of each optical signal is determined by the expressed items, the corresponding deaggregation order is also determined according to priority, thereby reducing post-processing steps and improving classification processing efficiency. Attached Figure Description

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

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

[0027] The meanings of the labels in the diagram are as follows:

[0028] 10. Optical signal analysis module;

[0029] 20. Optical signal representation item marking module;

[0030] 30. Optical signal modulation module;

[0031] 40. Optical signal conversion module; 410. Item representation simulation unit; 420. Item representation numerical labeling unit; 430. Pre-transmission sequence planning unit;

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

[0033] 60. Express project priority update module. Detailed Implementation

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see 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] Among them, the optical signal transmitting end processing platform is used to collect the content of each optical signal that needs to be transmitted and obtain the corresponding expression items;

[0037] 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 of different wavelengths are aggregated through channel aggregation. Figure 1 The signals a1-a5 in the middle are aggregated into the same optical fiber ( Figure 1 In the middle signal a), the light is transmitted, and at the receiving end, the light signals of different wavelengths are separated again by de-aggregation;

[0038] According to the requirements of the receiver and transmitter, the optical signal conversion module 40 uses IFFT to convert the time domain signal into a frequency domain signal, and uses FFT to convert the frequency domain signal into a time domain signal, and feeds it back to the optical signal modulation module 30 for aggregation and deaggregation processing.

[0039] The receiving end optical signal processing platform is used to obtain the optical signal processing content of the receiving end, update the priority of each optical signal expression item 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 and transmission of each optical signal according to the priority of the expression item.

[0040] In practical use, during the transmission of optical signals, the optical signal transmitting end processing platform first collects the content of each optical signal that needs to be transmitted 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] To ensure transmission speed, during transmission, the optical signal modulation module 30 performs aggregation and deaggregation processing on multiple optical signals. At the transmitting end, channel aggregation is used to combine multiple optical signals of different wavelengths into the same optical fiber for transmission. At the receiving end, deaggregation is used to separate the optical signals of different wavelengths. Simultaneously, to facilitate optical signal classification processing at the receiving end, the optical signal processing requirements of the receiving end need to be obtained before aggregation. This requires obtaining the optical signal processing content from the receiving end's optical signal processing platform, updating the priority of each optical signal's expression item based on the optical signal processing content, and feeding back the updated priority of the expression item to the optical signal modulation module 30. Because different expression... Since the signals represented by the projects are different, the representation projects need to be determined during the conversion between time-domain and frequency-domain signals. That is, the optical signal conversion module 40 uses IFFT to convert the time-domain signal into a frequency-domain signal and FFT to convert the frequency-domain signal back into a time-domain signal according to the needs of the receiver and transmitter. The signal is then fed back to the optical signal modulation module 30 for aggregation and deaggregation processing. The optical signal modulation module 30 plans the aggregation and transmission order of each optical signal according to the priority of the representation projects. Thus, when the receiver receives each optical signal, since each optical signal is determined by the priority of the representation projects, the corresponding deaggregation order is also determined according to the priority, reducing post-processing steps and improving classification processing efficiency.

[0042] In addition, the optical signal transmitting end processing platform includes an optical signal analysis module 10 and an optical signal expression item marking module 20. The optical signal analysis module 10 is used to collect the 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 items of each optical signal and obtain the corresponding 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, as well as the distribution of the optical signal at different frequencies, and the spectral width, spectral shape, center frequency, and sideband frequency of the optical signal.

[0044] In practical use, during the transmission of optical signals, in order to perform subsequent classification processing, the optical signal analysis module 10 first needs to collect the information content of the optical signals, such as the number and type of optical signals to be transmitted. Then, the optical signal expression item marking module 20 combines the information content of the optical signals to obtain the expression items of each optical signal and obtain the corresponding values. The expression items involved in this invention include the shape, duration, and interval of the optical pulses in the time domain signal, as well as 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. Finally, it also includes the spectral characteristics of the corresponding optical signal, namely the spectral width (the spectral width of the optical signal refers to the distribution range of the signal in the frequency domain), spectral shape (the spectral shape of the optical signal can be Gaussian, Lorentz, or other complex shapes), center frequency (the center frequency of the optical signal refers to the center position of the spectral distribution. In a 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 sideband frequencies (during the modulation process, the optical signal will generate sideband frequencies, which contain information of the modulation signal). These are all used as expression items in the current optical signal transmission process.

[0045] Because different representation items correspond to different methods of expression—for example, the shape, duration, and interval of a light pulse are represented by a time-domain signal, while the distribution of a light signal at different frequencies is represented by a frequency-domain signal—and transmission is mostly in the form of a frequency-domain signal, classifying representation items to adapt to different processing needs is crucial. For instance, during signal debugging, it is necessary to analyze the duration of the light pulse; the corresponding duration of the light pulse is the target representation item, which has the highest priority at the receiving end. At the transmitting end, before transmitting the light signal, the entire light signal is still represented by a time-domain signal, allowing for a direct understanding of the duration of the corresponding light pulse. During this process, the transmission order is determined in the aggregated channel according to the duration of each optical pulse. Even after the optical signal is converted into a frequency domain signal (this is because, in most cases, due to the dispersion characteristics of optical fibers, optical signals of different frequencies will propagate at different speeds, causing the time domain signal to broaden or distort; at the receiving end, the received time domain signal can be converted into a frequency domain signal to analyze the changes in the signal at different frequencies, thereby taking corresponding measures to recover the original time domain signal and improve the signal transmission quality), the corresponding de-aggregation order remains the same as the transmission order. No secondary optical signal conversion is required; the frequency domain signal can be used for analysis and processing, reducing the optical signal conversion frequency.

[0046] Furthermore, the optical signal modulation module 30 plans the order of optical signal aggregation and transmission according to the priority of the expressed items using a link aggregation control protocol. The specific steps are as follows:

[0047] S301. Configure interfaces for different optical signals at the receiving end and mark them as receiving end matching interfaces;

[0048] S302. According to the priority of each optical signal expression item updated by the receiver, obtain the LACP priority of the corresponding receiver matching interface;

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

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

[0051] Specifically, such as 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 displays the corresponding expression items through a simulation chart based on the content of each expression item. The expression item value marking unit 420 obtains the values ​​of each expression item based on the simulation content of the simulation chart. The pre-transmission sequence planning unit 430 performs pre-transmission sequence matching for different optical signals according to the expression item values.

[0052] Furthermore, 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 number of express items Ex quantity According to the quantity of the expressed item Ex quantity Establish the corresponding sequential storage package for the expression items;

[0054] S4302. Name the sequential storage package of the expression item according to its contents;

[0055] S4303. Store the corresponding pre-transmission order through different expression item sequential storage packages.

[0056] In practical use, to facilitate the determination of expression items later, the values ​​of expression items need to be determined before and after the conversion between the frequency domain signal and the time domain signal. First, the expression item simulation unit 410 displays the corresponding expression items through simulation graphs based on the content of each expression item, such as corresponding waveform graphs. The waveform graphs show the numerical changes of each expression item during different changes. Then, the expression item value marking unit 420 obtains the values ​​of each expression item based on the simulation content of the simulation graph, which serves as the basis for matching the expression item order later. Finally, the pre-transmission order planning unit 430 performs pre-transmission ordering of different optical signals according to the expression item values. The matching is performed and stored in the expression item sequence storage package. That is, different expression item sequence storage packages store the transmission order of each optical signal corresponding to different expression item states. During the channel aggregation process, the expression item priority fed back by the receiver is used to match the expression item that needs to be considered first, that is, the expression item with the highest priority, and obtain the corresponding expression item sequence storage package. The corresponding storage order is directly applied as the transmission order for aggregation and transmission. In this way, the expression item order is preprocessed before and after the frequency domain signal to time domain signal conversion, so as to avoid the need for secondary conversion work when the signal type corresponding to the selected expression item has been converted.

[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, and the expression item priority update module 60, in conjunction with the content to be processed at the receiving end, performs real-time update processing on the priority of each expression item and updates the priority of the corresponding matching interface. In practical use, during the optical signal processing at the receiving end, in some cases, the corresponding expression items of the optical signal cannot be directly obtained after conversion, requiring secondary conversion. Additionally, to adapt to other processing tasks, such as when the received optical signal is affected by dispersion, causing distortion in the time domain, converting the time domain signal to the frequency domain allows analysis of signal attenuation at different frequencies and subsequent compensation measures. This necessitates re-conversion, leading to redundancy in the conversion process. Therefore, to avoid these problems, the content to be processed at the receiving end needs to be obtained in advance through the optical signal processing content definition module 50. This involves obtaining the optical signal status through different expression items and matching the corresponding processing method. At this point, the expression item priority update module 60, combined with the content to be processed at the receiving end, updates the priority of each expression item in real time and updates the priority of the corresponding matching interface. The optical signal receiving work corresponding to the matched expression item is then performed through the corresponding matching interface, and the receiving processing is carried out according to the priority order of the matching interface.

[0058] The foregoing has shown and described 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 to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical communication system based on cascaded IFFT / FFT multi-channel aggregation de-aggregation, characterized by: The optical signal sending end processing platform, the optical signal modulation module (30), the optical signal conversion module (40) and the receiving end optical signal processing platform are included. The optical signal sending end processing platform is used for collecting the contents of each optical signal to be sent and obtaining the corresponding expression item. The optical signal modulation module (30) is used for performing aggregation and disaggregation processing on multiple optical signals, aggregating multiple optical signals of different wavelengths into the same optical fiber for transmission at the sending end by channel aggregation, and separating the optical signals of different wavelengths at the receiving end by disaggregation. The optical signal conversion module (40) converts the time domain signal into the frequency domain signal by IFFT and converts the frequency domain signal into the time domain signal by FFT according to the needs of the receiving end and the sending end, and feeds back to the optical signal modulation module (30) for aggregation and disaggregation processing. The receiving end optical signal processing platform is used for obtaining the optical signal processing content of the receiving end, updating the priority of the expression item of each optical signal in combination with the optical signal processing content, and feeding 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 and 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 de-aggregation of claim 1, wherein: The optical signal sending end processing platform includes an optical signal analysis module (10) and an optical signal expression item marking module (20). The optical signal analysis module (10) is used for collecting the information content of the optical signal. The optical signal expression item marking module (20) obtains the expression item of each optical signal in combination with the information content of the optical signal, and obtains the corresponding numerical value.

3. The optical communication system based on cascaded IFFT / FFT multi-channel aggregation de-aggregation of claim 2, wherein: The expression item in the optical signal expression item marking module (20) includes the shape, duration and interval of the optical pulse in the time domain signal, the distribution of the optical signal at different frequencies, the spectral width, spectral shape, center frequency and sideband frequency of the optical signal.

4. The multi-channel aggregation de-aggregation based optical communication system using cascaded IFFT / FFT of claim 1, wherein: The optical signal modulation module (30) uses link aggregation control protocol to plan the order of aggregation and transmission of each optical signal according to the priority of the expression item, and the specific steps are as follows: S301, configuring interfaces for different optical signals at the receiving end and marking them as receiving end matching interfaces; S302, obtaining the LACP priority of the receiving end matching interface according to the priority of the expression item of each optical signal updated at the receiving end; S303, setting the matching relationship between the numerical value of the LACP priority of the receiving end matching interface and the receiving order.

5. The multi-channel aggregation de-aggregation based on cascaded IFFT / FFT optical communication system of claim 1, wherein: The optical signal conversion module (40) includes an expression item simulation unit (410), an expression item numerical value marking unit (420) and a pre-transmission order planning unit (430). The expression item simulation unit (410) represents the corresponding expression item by simulation diagram according to the expression item content. The expression item numerical value marking unit (420) obtains the expression item numerical value according to the simulation content of the simulation diagram. The pre-transmission order planning unit (430) matches the pre-transmission order of different optical signals according to the expression item numerical value.

6. The multi-channel aggregation de-aggregation optical communication system based on cascaded IFFT / FFT of claim 5, wherein: The method for pre-transmission sequence matching of different optical signals according to different expression item values in the pre-transmission sequence planning unit (430) comprises the following steps: S4301、Obtain expression item quantity Ex quantity According to expression item quantity Ex quantity Establish corresponding expression item order storage package; S4302, naming processing of expression item sequence storage packages is performed according to storage contents of the expression item sequence storage packages; S4303, pre-transmission sequences are matched through different expression item sequence storage package storage.

7. The multi-channel aggregation de-aggregation based optical communication system using cascaded IFFT / FFT of claim 1, wherein: The receiving end optical signal processing platform comprises an optical signal processing content definition module (50) and an expression item priority updating module (60), the optical signal processing content definition module (50) is used for acquiring receiving end to-be-processed contents, the expression item priority updating module (60) combines the receiving end to-be-processed contents, and the priority of each expression item is updated in real time, and the priority of the corresponding matching interface is updated.

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