CN118041454B - High-speed multimode optical module system based on adaptive wavelength division multiplexing - Google Patents
High-speed multimode optical module system based on adaptive wavelength division multiplexing Download PDFInfo
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Abstract
The invention discloses a high-speed multimode optical module system based on self-adaptive wavelength division multiplexing. Relates to the technical field of optical modules. The system comprises: the optical signal input unit is used for inputting optical signals of a plurality of optical signal channels with different numbers into the optical module system at the transmitting end, and establishing a multimode optical fiber model by using a transmission equation; a wavelength division and modulation unit for dividing an input optical signal into optical signals corresponding to different wavelengths; the self-adaptive wavelength processing unit is used for self-adaptively modulating each optical signal channel and improving the transmission efficiency to the greatest extent; the multimode optical fiber transmission unit is used for transmitting the modulated optical signals through multimode optical fibers; the self-adaptive wavelength inverse processing unit is used for carrying out self-adaptive wavelength inverse modulation on the receiving end so as to restore the optical signal; and the optical signal recovery unit is used for recovering the original optical signal and removing noise, distortion and time delay. The invention improves the transmission efficiency, the signal quality and the reliability, and simplifies the system structure.
Description
Technical Field
The present disclosure relates to, but is not limited to, the field of optical module technology, and in particular, to a high-speed multimode optical module system based on adaptive wavelength division multiplexing.
Background
In the digital information age today, the demand for high-speed data transmission and communication is increasing in an explosive manner. Optical communication technology has become one of the key technologies to meet these demands, and it uses optical fibers to transmit data, providing tremendous bandwidth and transmission speed. However, in a multi-wavelength multiplexing system, there are a series of complex technical challenges, such as wavelength division, modulation, transmission, interference, and recovery, which have some influence on the transmission and decoding of optical signals.
The basic principle of the optical communication system is to transmit optical signals through optical fibers to realize high-speed data transmission. In a multi-wavelength multiplexing system, optical signals of different wavelengths are combined together, transmitted through the same optical fiber, and then separated and decoded at the receiving end. While this technology has met with great success in improving transmission speed and bandwidth, there are still some technical challenges and problems: in multi-wavelength systems, wavelength selection and modulation become critical issues. Conventional approaches are typically fixed wavelength and fixed modulation schemes, which can lead to interference and inefficiency between wavelengths. Optical signals of different wavelengths may interfere with each other when transmitted in an optical fiber, which may lead to a degradation of signal quality. The prior art lacks an adaptive wavelength processing mechanism, and interference cannot be sufficiently reduced. Optical signals are subject to effects such as loss, dispersion, nonlinearity, etc. as they are transmitted in optical fibers, which can lead to signal distortion and power attenuation. At the receiving end, the received multi-wavelength optical signal needs to be recovered and separated. In the prior art, signal recovery and separation typically requires multiple independent devices and complex algorithms, adding to the complexity and cost of the system. Optical signals are susceptible to interference from various noise, such as photon noise, electronic noise, etc., during transmission, which may lead to reduced signal quality and increased bit error rate.
Disclosure of Invention
The high-speed multimode optical module system based on the adaptive wavelength division multiplexing has the advantages of improving transmission efficiency, improving signal quality and reliability, simplifying system structure, reducing cost and bringing remarkable beneficial effects to the field of optical communication.
The present invention provides a high-speed multimode optical module system based on adaptive wavelength division multiplexing, the system comprising: the optical signal input unit is used for inputting optical signals of a plurality of optical signal channels with different numbers into the optical module system at the transmitting end, and establishing a multimode optical fiber model by using a transmission equation; the wavelength division and modulation unit is used for dividing an input optical signal into optical signals corresponding to different wavelengths, optimizing the divided wavelength values based on a model of the multimode optical fiber during division so as to maximize the absolute value of the optical power integral of the optical signal at each wavelength in the transmission process of the optical signal in the multimode optical fiber, and then carrying out wavelength modulation on the optical signal corresponding to each wavelength; the adaptive wavelength processing unit is used for adaptively selecting the optimal wavelength to reduce the mutual interference among optical signals to the greatest extent, adaptively modulating each optical signal channel and improving the transmission efficiency to the greatest extent; the multimode optical fiber transmission unit is used for transmitting the modulated optical signals through multimode optical fibers; the self-adaptive wavelength inverse processing unit is used for carrying out self-adaptive wavelength inverse modulation on the receiving end so as to restore the optical signals, and separating the optical signals with different wavelengths by using a self-adaptive optical signal separation algorithm; and the optical signal recovery unit is used for recovering the original optical signals, removing noise, distortion and time delay, and integrating the optical signals of different channels into a complete multi-wavelength optical signal.
Further, the optical signals of the different optical signal channels are set asWherein/>Representing serial numbers of different optical signal channels; at each moment/>Optical signal/>, of different optical signal channelsThe expression is used as follows:
；
Wherein, Is the optical signal amplitude; /(I)Is the optical signal frequency; /(I)Is the optical signal phase; /(I)Is a phase jitter function of the optical signal; /(I)For/>Independent variables of (2); and calculating the optical power distribution of the optical signals of the different optical signal channels by using the following formula:
；
Wherein, For optical signal channel/>An optical power distribution of an optical signal of (a); /(I)Is a spatial position coordinate; /(I)Is wavelength; /(I)And/>The central positions in the space and wavelength directions determine the central position of the optical power distribution; /(I)AndThe width parameters are width parameters, and the widths of the optical power distribution in the space and wavelength directions are respectively controlled to determine the widths of the space and wavelength distributions of the optical signals.
Further, modeling a multimode optical fiber using a transmission equation is represented by the following formula:
；
for optical signal channel/> The complex amplitude of the optical signal of (2) is a function of propagation distance/>And wavelength/>A function of the change; /(I)The loss coefficient of an optical fiber is the power attenuation rate of an optical signal in the transmission process of the optical fiber. Greater/>The value represents higher losses; /(I)For the second-order dispersion parameter, the effect of the second derivative of the wavelength of the optical signal on the propagation speed is described; /(I)For the third-order dispersion parameter, the effect of the third derivative of the wavelength of the optical signal on the propagation velocity is described.
Further, the wavelength division and modulation unit performs division using the grating, and at the time of division, optimizes the divided wavelength values based on a model of the multimode optical fiber using the following formula so that the absolute value of the optical power integral at each wavelength during transmission of the optical signal in the multimode optical fiber is maximized:
；
Wherein, The number of channels multiplexed is also equal to the number of optical signals of different wavelengths from different channels in the optical module system; /(I)Representing the length of the multimode optical fiber; /(I)Integrating the optical power.
Further, the wavelength division and modulation unit, and the reuse controller, perform modulation based on the following formula:
；
Wherein, For/>Wavelength of the individual optical signal channels/>An electric field optical signal on the upper surface; /(I)Is the speed of light.
Further, the adaptive wavelength processing unit adaptively selects an optimal wavelength to minimize mutual interference between optical signals based on the following formula:
；
Wherein, For/>The optimal wavelength selected for each optical signal path.
Further, the adaptive wavelength processing unit adaptively modulates each optical signal channel by using the following formula, thereby improving transmission efficiency to the greatest extent:
；
Wherein, Is the modulation frequency.
Further, the multimode optical fiber transmission unit transmits the modulated optical signal through the multimode optical fiber, and the expression of the obtained optical signal is:
；
Wherein, Is the beam radius of the wave; /(I)Is a wave vector.
Further, the adaptive wavelength inverse processing unit, at the receiving end, outputs an optical signalApplying a reverse modulation function to perform adaptive wavelength reverse modulation to restore the optical signal; the adaptive optical signal separation algorithm used by the adaptive wavelength inverse processing unit is a multi-channel demodulation algorithm, and separates optical signals with different wavelengths.
Further, the optical signal recovery unit uses a filter to remove noise, performs nonlinear step length to remove distortion, and performs differential compensation to remove time delay; the optical signal recovery unit sums the optical signals of different channels to integrate the optical signals into a complete multi-wavelength optical signal.
The high-speed multimode optical module system based on the self-adaptive wavelength division multiplexing has the following beneficial effects: the wavelength division and modulation unit is capable of dividing an input plurality of optical signals of different wavelengths into optical signals corresponding to the different wavelengths by using a multimode optical fiber model and a wavelength division optimization formula, and optimizing the wavelength values so that an absolute value of an optical power integral at each wavelength during transmission of the optical signals in the multimode optical fiber is maximized. The wavelength division optimization is helpful for utilizing the bandwidth of the optical fiber to the greatest extent, and improves the transmission efficiency. The adaptive wavelength processing unit reduces mutual interference between optical signals to the greatest extent by adaptively selecting an optimal wavelength, thereby further improving transmission efficiency. The absolute value of the optical power integral is the largest in the transmission process of the optical signal in the multimode optical fiber through the wavelength division and the wavelength division optimization formula of the wavelength division and the modulation unit, so that the strength and the quality of the signal are ensured. This helps to reduce the risk of signal distortion and signal interference. The adaptive wavelength processing unit minimizes the mutual interference between the optical signals by selecting the optimal wavelength. The optical signals with different wavelengths can be accurately separated and restored at the receiving end, and the reliability of the signals is improved. The optical signal recovery unit removes noise, removes distortion, and performs differential compensation using a filter to remove time delay. These operations further improve the signal quality, ensuring that the received optical signal is a high quality, stable signal.
Drawings
Fig. 1 is a schematic system structure diagram of a high-speed multimode optical module system based on adaptive wavelength division multiplexing according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present disclosure more clear and obvious, the present disclosure is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the present disclosure.
Example 1: referring to fig. 1, a high-speed multimode optical module system based on adaptive wavelength division multiplexing, the system comprising: the optical signal input unit is used for inputting optical signals of a plurality of optical signal channels with different numbers into the optical module system at the transmitting end, and establishing a multimode optical fiber model by using a transmission equation; the wavelength division and modulation unit is used for dividing an input optical signal into optical signals corresponding to different wavelengths, optimizing the divided wavelength values based on a model of the multimode optical fiber during division so as to maximize the absolute value of the optical power integral of the optical signal at each wavelength in the transmission process of the optical signal in the multimode optical fiber, and then carrying out wavelength modulation on the optical signal corresponding to each wavelength; the adaptive wavelength processing unit is used for adaptively selecting the optimal wavelength to reduce the mutual interference among optical signals to the greatest extent, adaptively modulating each optical signal channel and improving the transmission efficiency to the greatest extent; the multimode optical fiber transmission unit is used for transmitting the modulated optical signals through multimode optical fibers; the self-adaptive wavelength inverse processing unit is used for carrying out self-adaptive wavelength inverse modulation on the receiving end so as to restore the optical signals, and separating the optical signals with different wavelengths by using a self-adaptive optical signal separation algorithm; and the optical signal recovery unit is used for recovering the original optical signals, removing noise, distortion and time delay, and integrating the optical signals of different channels into a complete multi-wavelength optical signal.
Specifically, the optical signal input unit first receives input optical signals from different optical signal channels. These channels may represent different data streams, wavelengths or frequencies, each carrying specific information. Next, the optical signal input unit uses the transmission equation to model the multimode optical fiber. The transmission equation describes the propagation and attenuation processes of the optical signal in the multimode fiber, taking into account the refractive index distribution, mode coupling, attenuation, etc. of the multimode fiber. This model is built based on the physical properties and mathematical model of the multimode fiber. By analyzing the model of the multimode optical fiber, the optical signal input unit can obtain information about transmission loss, dispersion, mode coupling, and the like. This information is important for wavelength division, modulation and adaptive wavelength processing in subsequent steps.
First, the wavelength division and modulation unit divides a plurality of input optical signal channels. This may be achieved by a grating, beam splitter or other optical element that is capable of separating optical signals of different wavelengths. At the time of splitting, the split wavelength values are optimized based on the model of the multimode optical fiber. This step aims to ensure that the absolute value of the optical power integral at each wavelength is maximum during transmission of the optical signal in the multimode fibre. This typically requires consideration of the refractive index profile of the multimode fiber, transmission loss, and other factors. The optical signal corresponding to each wavelength is wavelength modulated. This may be achieved using different modulation techniques, such as amplitude modulation, frequency modulation or phase modulation. The modulation process embeds digital information into the optical signal for demodulation and data recovery during transmission.
The adaptive wavelength-processing unit constantly monitors the quality and performance of the optical signal path for each wavelength. This may include measuring parameters such as signal power, signal to noise ratio, distortion level, etc. Based on the monitoring result, the optimal wavelength is selected. The optimal wavelength is typically the wavelength that provides the best transmission performance and minimal mutual interference. The modulation scheme of the optical signal is adaptively adjusted according to the selected wavelength and channel characteristics. This may include adjustment of parameters such as modulation depth, modulation rate, modulation type, etc. The goal is to maximize the transmission efficiency of each optical signal channel.
A multi-wavelength optical signal is injected into a multimode optical fiber. In multimode optical fibers, optical signals may be transmitted in a plurality of optical modes. Each optical mode has a different propagation velocity, which may cause modal dispersion of the signal in the multimode fiber, thus requiring subsequent processing to overcome. Optical signals may experience transmission loss and dispersion during transmission in multimode optical fibers. Transmission loss is the attenuation of the optical signal power, while dispersion is the signal distortion caused by the difference in propagation speed of optical signals of different wavelengths. These problems need to be handled at the receiving end. The adaptive wavelength inverse processing unit first receives the multi-wavelength optical signal from the multimode optical fiber transmission unit. These optical signals may comprise multiple wavelength or frequency optical signal channels. And separating the received multi-wavelength optical signals by utilizing an adaptive optical signal separation algorithm. This algorithm can identify and separate optical signal channels of different wavelengths for subsequent processing. The separated optical signals of each wavelength are subjected to adaptive wavelength inverse modulation. This step restores the original optical signal, removing the modulation, noise and distortion introduced during transmission. And integrating the optical signals of the wavelength channels subjected to the adaptive wavelength inverse modulation treatment into multi-wavelength optical signals. This process can recombine the information of the different channels into a complete multi-wavelength optical signal.
Example 2: setting the optical signals of different optical signal channels asWherein/>Representing serial numbers of different optical signal channels; at each moment/>Optical signal/>, of different optical signal channelsThe expression is used as follows:
；
Wherein, Is the optical signal amplitude; /(I)Is the optical signal frequency; /(I)Is the optical signal phase; /(I)Is a phase jitter function of the optical signal; /(I)For/>Independent variables of (2); and calculating the optical power distribution of the optical signals of the different optical signal channels by using the following formula:
；
Wherein, For optical signal channel/>An optical power distribution of an optical signal of (a); /(I)Is a spatial position coordinate; /(I)Is wavelength; /(I)And/>The central positions in the space and wavelength directions determine the central position of the optical power distribution; /(I)AndThe width parameters are width parameters, and the widths of the optical power distribution in the space and wavelength directions are respectively controlled to determine the widths of the space and wavelength distributions of the optical signals.
In particular, the method comprises the steps of,The center position in the spatial direction is indicated, which determines the center position of the optical power distribution of the optical signal in space. In an optical system, it can be regarded as the center of the light beam or the center position of the spot. /(I)The center position in the wavelength direction is indicated, which determines the center position of the wavelength distribution of the optical signal. In spectroscopic analysis, it is often expressed as the center wavelength of a spectral line. /(I)Is a width parameter for controlling the width of the optical power distribution in the spatial direction. It determines the extent of expansion or spatial size of the optical signal in space. Greater/>Values represent a more extensive distribution of the optical signal in space, while smaller values represent a more concentrated optical signal. /(I)Is a width parameter for controlling the width of the optical power distribution in the wavelength direction. It determines the width of the distribution of the optical signal in the wavelength domain. Greater/>A value indicates a broader distribution of the optical signal in the wavelength direction, and a smaller value indicates a narrower wavelength range of the optical signal. /(I)And/>Determines the central position of the optical power distribution, and/>And/>The width of the optical power distribution is determined. Adjustment of these parameters may optimize the characteristics of the optical signal according to specific application requirements, for example, changing the distribution shape of the optical signal in space and wavelength directions or adjusting the wavelength range of the optical signal.
The phase jitter function being a sinusoidal function。/>Representing the amplitude of the phase jitter, which determines the magnitude of the phase jitter. /(I)The frequency of the phase jitter is represented, which determines the periodicity of the phase jitter. This phase jitter function takes the form of a sine wave whose amplitude is defined by/>Controlled, frequency is defined by/>And (5) controlling. The sinusoidal phase dithering function may periodically change the phase of the optical signal and thus may introduce a phase change in the optical signal.
Example 3: modeling multimode optical fibers using transmission equations is represented by the following formula:
；
for optical signal channel/> The complex amplitude of the optical signal of (2) is a function of propagation distance/>And wavelength/>A function of the change; /(I)The loss coefficient of an optical fiber is the power attenuation rate of an optical signal in the transmission process of the optical fiber. Greater/>The value represents higher losses; /(I)For the second-order dispersion parameter, the effect of the second derivative of the wavelength of the optical signal on the propagation speed is described; /(I)For the third-order dispersion parameter, the effect of the third derivative of the wavelength of the optical signal on the propagation velocity is described.
In particular, the method comprises the steps of,Representing optical signal channel/>Is a complex amplitude with propagation distance/>And wavelength ofA function of the change. The complex amplitude includes amplitude and phase information of the optical signal, and thus can describe the amplitude and phase of the optical signal as a function of propagation. /(I)Representing complex amplitude of optical signal with propagation distance/>I.e. the change in propagation direction. This term describes the attenuation and phase change of an optical signal during propagation. /(I)Representing the effect of fiber loss, wherein/>Is the loss factor of the fiber. This term represents the power decay rate of the optical signal during transmission in the fiber, greater/>The value represents a higher loss. This term results in a decrease in the amplitude of the optical signal, with a gradual decrease in the power of the optical signal as the propagation distance increases. /(I)Representing the effect of second order dispersion, where/>Is a second order dispersion parameter. This term describes the effect of the second derivative of the wavelength of the optical signal on the propagation speed. The negative sign indicates that optical signals of different wavelengths propagate at different speeds in the multimode fiber, resulting in wavelength dispersion. This term results in the optical signals of different wavelengths being subject to dispersion in the propagation, affecting the phase and spectrum of the optical signals. /(I)Representing the effect of third-order dispersion, wherein/>Is a third-order dispersion parameter. This term describes the effect of the third derivative of the wavelength of the optical signal on the propagation velocity. Third-order dispersion is commonly used to describe nonlinear optical effects that cause complex phase and amplitude variations in the propagation of optical signals of different wavelengths. The principle of the formula is that the propagation process of the optical signal channel in the multimode optical fiber is described, and the influence of optical fiber loss, second-order dispersion and third-order dispersion is considered. By solving this differential equation, the amplitude and phase changes of the optical signal during propagation, as well as the chromatic dispersion effect of the wavelength, can be known. This is critical to the design and performance analysis of optical communication and fiber optic transmission systems, as it can help optimize the quality and stability of signal transmission.
Example 4: the wavelength division and modulation unit performs division using a grating, and at the time of division, optimizes a divided wavelength value based on a model of the multimode optical fiber so that an absolute value of an optical power integral at each wavelength during transmission of the optical signal in the multimode optical fiber is maximized using the following formula:
；
Wherein, The number of channels multiplexed is also equal to the number of optical signals of different wavelengths from different channels in the optical module system; /(I)Representing the length of the multimode optical fiber; /(I)Integrating the optical power.
In particular, the method comprises the steps of,Representing the number of multiplexed channels, is also equal to the number of optical signals of different wavelengths from different channels in the optical module system. Each channel corresponds to a different wavelength, multiplexing allows transmission of optical signals of multiple wavelengths in the same optical fiber. /(I)Indicating the length of the multimode optical fiber, i.e., the distance the optical signal travels in the multimode optical fiber. The optical signal needs to be transmitted to the target site through an optical fiber, and its length can affect the efficiency and loss of transmission. /(I)Representing optical signal channel/>Is a complex amplitude with propagation distance/>And wavelength/>A function of the change. This complex amplitude includes amplitude and phase information of the optical signal, describing the amplitude and phase of the optical signal as a function of propagation distance and wavelength.Representing the integration of the complex amplitude of the optical signal, from/>To/>I.e. the amplitude of the optical signal is integrated over the length of the multimode optical fiber. This integration describes the amplitude variation of the optical signal during propagation in the multimode fiber. /(I)Representing an absolute value operation, ensures that the result of the optical power integration is non-negative. /(I)The optical power integral, i.e. the sum of the absolute values of the optical power integral at each wavelength in the multimode fiber, is represented. The goal of this formula is to maximize/>To ensure that the power integral of the optical signal at each wavelength in the multimode optical fiber is as large as possible, thereby improving the transmission efficiency of the optical signal. By optimizing the wavelength division, the absolute value of the optical power integration during the transmission of optical signals of different wavelengths in the multimode fiber can be maximized. This means that the optical signal of each wavelength can fully utilize the transmission characteristics of the multimode optical fiber, reduce the transmission loss to the maximum extent, and improve the transmission efficiency.
Example 5: a wavelength division and modulation unit, and a reuse modulator, which modulates based on the following formula:
；
Wherein, For/>Wavelength of the individual optical signal channels/>An electric field optical signal on the upper surface; /(I)Is the speed of light.
In particular, the method comprises the steps of,Representing optical signal channel/>Is a wavelength/>And time/>Is a function of (2). This function describes the complex amplitude of the optical signal while taking into account the effects of amplitude, frequency, phase jitter and wavelength. /(I)The amplitude of the optical signal, i.e. the intensity or optical power of the signal, is controlled. By adjusting/>The strength of the signal can be changed, which has important influence on the signal transmission distance and quality in the optical communication system. /(I)The frequency of the optical signal, i.e. the periodicity of the signal, is determined. Signals of different frequencies correspond to different light waves, which are used for multi-wavelength multiplexing in optical communications. /(I)The phase of the optical signal, i.e. the starting phase of the signal, is affected. The phase information is very important for demodulation and signal recovery. /(I)Representing optical signal channel/>Which may vary over time. The phase jitter function introduces a change in the phase of the signal over time, which needs to be considered in high-speed communications, as it may cause phase distortion. /(I)Representing the integral effect of the phase jitter function, which takes into account the phase variations accumulated over time. This term describes how the phase of the signal evolves over time, a very critical signal characteristic. /(I)Is the wavelength modulation factor, which is related to the rate of change of the wavelength. This parameter controls how the wavelength of the optical signal changes over time. /(I)Representing a wavelength modulation section which correlates the wavelength of the optical signal with time and which is dependent on the wavelength modulation factor/>And phase/>Modulation is performed. This part determines how the wavelength of the optical signal changes with time, enabling wavelength modulation. The principle of this formula is that modulation of an optical signal is achieved by adjusting amplitude, frequency, phase jitter and wavelength parameters, and applying wavelength modulation. This allows optical signals with different characteristics to be generated in an optical communication system to meet different application requirements, such as multi-wavelength multiplexing, high-speed transmission, and signal recovery. The amplitude, frequency, phase, and wavelength of the optical signals may be adjusted to transmit information and perform various functions in optical communications.
Example 6: an adaptive wavelength processing unit adaptively selects an optimal wavelength to minimize mutual interference between optical signals based on the following formula:
；
Wherein, For/>The optimal wavelength selected for each optical signal path.
In particular, the method comprises the steps of,Represents the/>The optimal wavelength selected for each optical signal path. This wavelength is determined by an adaptive algorithm to maximize the optical signal/>I.e. to maximize the intensity or power of the optical signal. /(I)Representing optical signal channel/>Is an optical signal related to wavelength/>And time/>Is a function of (2). This function contains information about amplitude, frequency, phase and wavelength, describing the complex amplitude of the optical signal. /(I)The absolute value of the amplitude of the optical signal, i.e. the intensity or power of the signal, is indicated. The principle of the adaptive wavelength processing unit is to find the cause/>Maximum wavelength/>。/>Indicating that the search results in a range of wavelengths/>The maximum wavelength. This ensures that the selected wavelength maximizes the intensity of the optical signal. The adaptive wavelength processing unit is used for selecting the optimal wavelength in real-time or dynamic environment so as to minimize the mutual interference between the optical signal channels. This is important for multi-wavelength multiplexing systems because interference between wavelengths may degrade system performance when transmitting optical signals at multiple wavelengths in the same fiber. By constantly monitoring the amplitude of the signal and selecting the optimal wavelength, the adaptive wavelength processing unit may achieve the following effects: the power of each optical signal channel is maximized, and the strength and quality of the signal are improved. Minimizing cross-talk and cross-talk between wavelengths. The signal characteristics between the different channels are adapted to ensure that they can co-exist and be transmitted efficiently. The principle and the function of the self-adaptive wavelength processing unit are beneficial to optimizing the performance of the optical communication system, improving the transmission quality and reliability of signals, and particularly in a complex multi-wavelength transmission environment, the technology can obviously improve the performance of the system.
Example 7: the adaptive wavelength processing unit is used for adaptively modulating each optical signal channel by using the following formula, so that the transmission efficiency is improved to the greatest extent:
；
Wherein, Is the modulation frequency.
In particular, the method comprises the steps of,Representing optical signal channel/>Is a time/>And wavelength/>Is a function of (2). This function contains information about amplitude, frequency, phase jitter, and wavelength, describing the complex amplitude of the optical signal. /(I)The amplitude of the optical signal, i.e. the intensity or power of the signal, is controlled. By adjusting/>The strength of the signal can be changed, and the signal transmission quality and the distance are greatly influenced. /(I)The frequency of the optical signal, i.e. the periodicity of the signal, is determined. Modulation frequency/>Is a time-dependent auxiliary frequency for modulating the signal in time. /(I)The phase of the optical signal, i.e. the starting position of the signal, is affected. The phase information is very important for demodulation and signal recovery. /(I)Representing optical signal channel/>Which may vary over time. The phase jitter function introduces a change in the phase of the signal over time, which needs to be considered in high-speed communications, as it may cause phase distortion. /(I)Is the wavelength modulation factor, which is related to the rate of change of the wavelength. This parameter controls how the wavelength of the optical signal changes over time. /(I)Is the modulation frequency/>The time modulated part of the signal, which modulates the signal in time.
The adaptive wavelength processing unit is used for adaptively modulating each optical signal channel to improve transmission efficiency to the greatest extent. By modulating the signal in time and wavelength, the following effects can be achieved: modulation in time (byImplementation) can time-interleave multiple signal channels, improving multiplexing efficiency. Modulation in wavelength (by/>Implementation) can adjust the signal in wavelength to adapt to the transmission characteristics of different wavelengths, and minimize the interference between wavelengths. By adjusting/>、/>、/>、/>And/>The transmission characteristics of each signal channel can be adaptively optimized to improve transmission efficiency and transmission distance. The principle and function of the adaptive wavelength processing unit helps to achieve efficient signal transmission in a multi-wavelength multiplexing system. By applying time and wavelength modulation to the signal path, the bandwidth and transmission characteristics of the optical fiber can be more effectively utilized, thereby improving the performance of the optical communication system. This is important for high-speed optical communication and data transmission.
Example 8: the multimode optical fiber transmission unit transmits the modulated optical signals through multimode optical fibers, and the expression of the obtained optical signals is as follows:
；
Wherein, Is the beam radius of the wave; /(I)Is a wave vector.
In particular, the method comprises the steps of,Representing optical signal channel/>Is a wavelength/>And time/>Is a function of (2). This function contains information such as amplitude, frequency, phase jitter, wavelength, position and transmission distance, describing the complex amplitude of the optical signal. /(I)The amplitude of the optical signal, i.e. the intensity or power of the signal, is controlled. By adjusting/>The strength of the signal can be changed, and the signal transmission quality and the distance are greatly influenced. /(I)The frequency of the optical signal, i.e. the periodicity of the signal, is determined. Signals of different frequencies correspond to different light waves, which are used for multiplexing in multimode optical fibers. /(I)The phase of the optical signal, i.e. the starting position of the signal, is affected. The phase information is very important for demodulation and signal recovery. /(I)Representing optical signal channel/>Which may vary over time. The phase jitter function introduces a change in the phase of the signal over time, which needs to be considered in high-speed communications, as it may cause phase distortion. /(I)Is the wavelength modulation factor, which is related to the rate of change of the wavelength. This parameter controls how the wavelength of the optical signal changes over time. /(I)Representing the Gaussian decay term of the transverse beam, wherein/>Is the beam radius of the wave. This term describes the attenuation of an optical signal in lateral space, and is commonly used to describe the beam transmission characteristics in multimode optical fibers. /(I)Representing a longitudinal propagation term, wherein/>Is wave vector,/>Is the transmission distance. This term describes the propagation of an optical signal in longitudinal space, taking into account the phase variations in the optical fiber.
The principle of this optical signal expression is to take into account a number of parameters and effects including amplitude, frequency, phase jitter, wavelength, beam transmission and longitudinal propagation. These parameters and effects together determine the characteristics of the transmitted optical signal. The multimode optical fiber transmission unit is used for transmitting the optical signals through the multimode optical fibers, and simultaneously considers the transmission characteristics of the optical signals in the transverse direction and the longitudinal direction so as to ensure the accurate transmission and recovery of the optical signals in the transmission process. Information such as amplitude, frequency, phase, etc. of the optical signal may be affected in transmission, and thus these factors need to be considered for signal optimization and recovery. Gaussian attenuation term in this expressionDescribes the attenuation of an optical signal in lateral space, while the longitudinal propagation term/>Propagation of an optical signal in longitudinal space is described. These terms take into account the transmission characteristics of the optical signal in the multimode fiber, including the diffusion of the optical beam and the phase variation of the longitudinal propagation.
Example 9: self-adaptive wavelength inverse processing unit, at receiving end, optical signalApplying a reverse modulation function to perform adaptive wavelength reverse modulation to restore the optical signal; the adaptive optical signal separation algorithm used by the adaptive wavelength inverse processing unit is a multi-channel demodulation algorithm, and separates optical signals with different wavelengths.
Specifically, at the receiving end, the adaptive wavelength inverse processing unit uses an inverse modulation function to transmit the optical signalAnd performing inverse modulation. The purpose of this inverse modulation function is to restore the optical signal from the transmission state to the original modulated signal. The process of de-modulation involves removing the effects of the modulation of the optical signal, including the effects of frequency, phase and amplitude, to restore the original signal characteristics. This process is typically implemented using an operation opposite to that at the time of modulation to ensure restoration of the optical signal. The adaptive optical signal separation algorithm used by the adaptive wavelength inverse processing unit is a multi-channel demodulation algorithm. The goal of such an algorithm is to separate out the different wavelength optical signals for separate processing or further analysis. The multi-channel demodulation algorithm uses the spectral characteristics of the optical signal to separate the optical signals at different wavelengths. Signals of different wavelengths have different frequency components in the frequency spectrum and can therefore be separated by frequency domain analysis. This algorithm generally requires consideration of mutual interference and overlap between the optical signals to ensure accurate separation of the signals at the different wavelengths. It can realize adaptive separation according to the frequency spectrum characteristic and wavelength information of the signal. In summary, the principle of the adaptive wavelength inverse processing unit is to inverse modulate the transmitted optical signal, restore it to the original modulated signal, and use a multi-channel demodulation algorithm to separate optical signals of different wavelengths. The function of this unit is to recover and separate the multi-wavelength optical signal at the receiving end for further processing and decoding. This is important for optical signal reception and decoding in a multi-wavelength multiplexing system, and it can be ensured that signals of a plurality of wavelengths can be accurately separated and restored to achieve efficient data transmission and communication.
Example 10: the optical signal recovery unit uses a filter to remove noise, performs nonlinear step length to remove distortion, and performs differential compensation to remove time delay; the optical signal recovery unit sums the optical signals of different channels to integrate the optical signals into a complete multi-wavelength optical signal.
Specifically, the optical signal may be disturbed by various noises during the transmission process, such as photon noise, electronic noise, and the like. The optical signal recovery unit uses a filter to remove these noise components. The filter may select an appropriate frequency range to filter based on characteristics of noise to reduce the effect of noise on the signal. Optical signals may be distorted during transmission, including amplitude distortion, phase distortion, and the like. The nonlinear step size is used to correct for these distortions, typically by applying a suitable signal processing algorithm. This may help restore the shape and characteristics of the original signal. The signal may be affected by propagation delays of the different channels during transmission, which may lead to signal asynchronization. The optical signal recovery unit removes these delays by differential compensation to ensure that the signals of the different channels are aligned in time. The optical signal recovery unit sums the processed optical signals of the different channels to integrate into a complete multi-wavelength optical signal. This is a common operation in multi-wavelength multiplexing systems for superimposing signals of multiple channels together to form one composite optical signal.
The principle of the optical signal recovery unit is to apply a series of signal processing techniques to improve the quality of the received optical signal. Removing noise, removing distortion, and removing delay helps to restore the quality and accuracy of the original signal. The principle of signal summation is to combine the signals of multiple channels into one complete multi-wavelength optical signal for further data processing and decoding. The function of this unit is to process the optical signal at the receiving end, making it suitable for subsequent data decoding and application. The performance of the optical signal recovery unit directly affects the performance and data reliability of the system.
The preferred embodiments of the present disclosure have been described above with reference to the accompanying drawings, and are not thereby limiting the scope of the claims of the present disclosure. Any modifications, equivalent substitutions and improvements made by those skilled in the art without departing from the scope and spirit of the present disclosure shall fall within the scope of the claims of the present disclosure.
Claims (10)
1. A high-speed multimode optical module system based on adaptive wavelength division multiplexing, the system comprising: the optical signal input unit is used for inputting optical signals of a plurality of different optical signal channels into the optical module system at the transmitting end, and establishing a multimode optical fiber model by using a transmission equation; the wavelength division and modulation unit is used for dividing an input optical signal into optical signals corresponding to different wavelengths, optimizing the divided wavelength values based on a model of the multimode optical fiber during division so as to maximize the absolute value of the optical power integral of the optical signal at each wavelength in the transmission process of the optical signal in the multimode optical fiber, and then carrying out wavelength modulation on the optical signal corresponding to each wavelength; the adaptive wavelength processing unit is used for adaptively selecting the optimal wavelength to reduce the mutual interference among optical signals to the greatest extent, adaptively modulating each optical signal channel and improving the transmission efficiency to the greatest extent; the multimode optical fiber transmission unit is used for transmitting the modulated optical signals through multimode optical fibers; the self-adaptive wavelength inverse processing unit is used for carrying out self-adaptive wavelength inverse modulation on the receiving end so as to restore the optical signals, and separating the optical signals with different wavelengths by using a self-adaptive optical signal separation algorithm; and the optical signal recovery unit is used for recovering the original optical signals, removing noise, distortion and time delay, and integrating the optical signals of different channels into a complete multi-wavelength optical signal.
2. The adaptive wavelength division multiplexing based high-speed multimode optical module system according to claim 1, wherein the optical signals of the different optical signal channels are set asWherein/>Representing serial numbers of different optical signal channels; at each moment/>Optical signal/>, of different optical signal channelsThe expression is used as follows:；
Wherein, Is the optical signal amplitude; /(I)Is the optical signal frequency; /(I)Is the optical signal phase; /(I)Is a phase jitter function of the optical signal; /(I)For/>Independent variables of (2); and calculating the optical power distribution of the optical signals of the different optical signal channels by using the following formula:
；
Wherein, For optical signal channel/>An optical power distribution of an optical signal of (a); /(I)Is a spatial position coordinate; /(I)Is wavelength; /(I)And/>The central positions in the space and wavelength directions determine the central position of the optical power distribution; /(I)And/>The width parameters are width parameters, and the widths of the optical power distribution in the space and wavelength directions are respectively controlled to determine the widths of the space and wavelength distributions of the optical signals.
3. The adaptive wavelength division multiplexing based high-speed multimode optical module system of claim 2 wherein modeling multimode optical fibers using transmission equations is represented by the following formula:
；
for optical signal channel/> The complex amplitude of the optical signal of (2) is a function of propagation distance/>And wavelength/>A function of the change; /(I)The loss coefficient of the optical fiber is represented by the power attenuation rate of the optical signal in the transmission process of the optical fiber, and the power attenuation rate is largerThe value represents higher losses; /(I)For the second-order dispersion parameter, the effect of the second derivative of the wavelength of the optical signal on the propagation speed is described; /(I)For the third-order dispersion parameter, the effect of the third derivative of the wavelength of the optical signal on the propagation velocity is described.
4. A high-speed multimode optical module system based on adaptive wavelength division multiplexing as claimed in claim 3, characterized in that the wavelength division and modulation unit uses grating to divide, and in dividing, the divided wavelength values are optimized based on the model of the multimode optical fiber using the following formula to maximize the absolute value of the optical power integral at each wavelength during transmission of the optical signal in the multimode optical fiber:
；
Wherein, The number of channels multiplexed is also equal to the number of optical signals of different wavelengths from different channels in the optical module system; /(I)Representing the length of the multimode optical fiber; /(I)Integrating the optical power.
5. The adaptive wavelength division multiplexing based high-speed multimode optical module system of claim 4 wherein the wavelength division and modulation unit, in turn, uses a modulator to modulate based on the following formula:
；
Wherein, For/>Wavelength of the individual optical signal channels/>An electric field optical signal on the upper surface; /(I)Is the speed of light.
6. The adaptive wavelength division multiplexing based high-speed multimode optical module system of claim 5 wherein the adaptive wavelength processing unit adaptively selects the optimal wavelength to minimize mutual interference between the optical signals based on the following formula:
；
Wherein, For/>The optimal wavelength selected for each optical signal path.
7. The adaptive wavelength division multiplexing based high-speed multimode optical module system of claim 6 wherein the adaptive wavelength processing unit adaptively modulates each optical signal channel using the following formula to maximize transmission efficiency:
；
Wherein, Is the modulation frequency.
8. The adaptive wavelength division multiplexing-based high-speed multimode optical module system of claim 7, wherein the multimode optical fiber transmission unit transmits the modulated optical signal through the multimode optical fiber to obtain an optical signal with the following expression:
；
Wherein, Is the beam radius of the wave; /(I)Is a wave vector.
9. The adaptive wavelength division multiplexing based high-speed multimode optical module system of claim 8 wherein the adaptive wavelength inverse processing unit, at the receiving end, is configured to receive the optical signalApplying a reverse modulation function to perform adaptive wavelength reverse modulation to restore the optical signal; the adaptive optical signal separation algorithm used by the adaptive wavelength inverse processing unit is a multi-channel demodulation algorithm, and separates optical signals with different wavelengths.
10. The adaptive wavelength division multiplexing based high-speed multimode optical module system of claim 9 wherein the optical signal recovery unit uses a filter to remove noise, performs nonlinear compensation to remove distortion, and performs differential compensation to remove delay; the optical signal recovery unit sums the optical signals of different channels to integrate the optical signals into a complete multi-wavelength optical signal.
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| CN1202285A (en) * | 1995-09-15 | 1998-12-16 | 集成光学元件有限公司 | Method for independently controlling wavelength component powers in optical wavelength division multiplexed transmission system |
| CN117728895A (en) * | 2024-02-07 | 2024-03-19 | 深圳市光为光通信科技有限公司 | 400G DR4 silicon photon plate integrated optical module driven by low power consumption |
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| CN117728895A (en) * | 2024-02-07 | 2024-03-19 | 深圳市光为光通信科技有限公司 | 400G DR4 silicon photon plate integrated optical module driven by low power consumption |
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