A video transmission apparatus, method and system

Abstract

The application discloses a kind of video transmission device, method and system, comprising: video signal encoding module, signal generation module, all-optical modulation module and video signal decoding module;The output of the video signal encoding module is electrically connected with the input of signal generation module;The signal generation module is used to generate signal light and convert the control signal into corresponding pulse sequence pump light;The all-optical modulation module is used to modulate and obtain modulated pulse optical signal, and the modulated pulse optical signal is converted into modulated pulse electrical signal after transmission ends;The video signal decoding module is used to demodulate and decode the modulated pulse electrical signal into second video signal.The application constructs end-to-end all-optical video transmission, photonizes modulator, realizes signal encoding-modulation-demodulation-decoding based on all-optical modulation, and improves the encoding quality and signal transmission stability of video transmission process.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication technology, and in particular to a video transmission device, method and system. BACKGROUND

[0002] With the rapid development of optical communication technology, the demand for data processing speed gradually increases with the increase of communication speed and explosive growth of data volume. At present, optical communication technology has become one of the mainstream technologies for video transmission. However, the transmission speed of electro-optical modulator is limited by the bandwidth of electrical signal transmission to electronic components, which needs electrical signal driving, and the power consumption increases significantly in high-speed scenarios. At the same time, the frequent conversion of optoelectronic and electro-optical signals in the modulation process causes delay in electrical signal processing.

[0003] Further, the electro-optical modulator generally uses waveguide structure, and there are differences between optical fiber and waveguide in core size, refractive index distribution and mode propagation constant, etc. When light is coupled from optical fiber to waveguide or vice versa, part of the light energy cannot be effectively transmitted, resulting in increased coupling loss and decreased signal-to-noise ratio of the signal. It is difficult to meet the demand for high-speed data processing by using electro-optical modulator.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a video transmission device, method and system to solve the problem that the optical fiber communication system is limited by the signal conversion of electro-optical modulator, resulting in significant increase in power consumption in high-speed transmission scenarios, delay in electrical signal processing and ineffective transmission.

[0006] The technical scheme of the present application is as follows:

[0007] A video transmission device, comprising: a video signal encoding module, a signal generating module, an all-optical modulation module and a video signal decoding module; wherein,

[0008] The output end of the video signal encoding module is electrically connected to the input end of the signal generating module, for providing a first video signal and pre-processing the first video signal to obtain a control signal;

[0009] The signal generating module is used to generate signal light and convert the control signal into corresponding pump light of pulse sequence, and emit to the light-in side of the all-optical modulation module;

[0010] The all-optical modulation module is electrically connected with the input end of the video signal decoding module, is used for modulating the signal light based on the power of the pump light, obtaining the modulation pulse light signal consistent with the waveform of the pump light, and is used for converting the modulation pulse light signal into a modulation pulse electrical signal after transmission and outputting the modulation pulse electrical signal to the video signal decoding module.

[0011] The video signal decoding module is used for demodulating and decoding the modulation pulse electrical signal into a second video signal.

[0012] Further, the video signal encoding module comprises a video signal source and a video signal encoder, and the signal generating module comprises a pump light generator and a signal light generator.

[0013] The output end of the video signal source is electrically connected with the input end of the video signal encoder, and is used for generating a first video signal to be transmitted.

[0014] The video signal encoder is electrically connected with the pump light generator, is used for pre-processing the first video signal, compressing the first video signal, and obtaining a control signal.

[0015] The output end of the pump light generator is connected with the all-optical modulation module, and is used for generating the pump light based on the control signal.

[0016] The output end of the signal light generator is connected with the all-optical modulation module, and is used for generating the signal light.

[0017] Further, the all-optical modulation module comprises a first optical coupler, a first wavelength division multiplexer, a first optical fiber, a second wavelength division multiplexer, a delay line, a first variable optical attenuator, a polarization controller and a second optical coupler.

[0018] The first optical coupler is arranged on the optical path of the output end of the signal light generator, the first input end of the first wavelength division multiplexer is arranged on the optical path of the first output end of the first optical coupler, the second input end of the first wavelength division multiplexer is arranged on the optical path of the output end of the pump light generator, the first wavelength division multiplexer, the first optical fiber, the second wavelength division multiplexer and the first input end of the second optical coupler are sequentially connected in the optical path, the delay line is arranged on the optical path of the second output end of the first optical coupler, the delay line, the first variable optical attenuator, the polarization controller and the second input end of the second optical coupler are sequentially connected in the optical path, and the output end of the second optical coupler is electrically connected with the output end of the video signal decoding module.

[0019] Further, the all-optical modulation module comprises a third wavelength division multiplexer and a micro ring.

[0020] The first input end of the third wavelength division multiplexer is arranged on the light path of the output end of the pump light generator, the second input end of the third wavelength division multiplexer is arranged on the light path of the output end of the signal light generator, and the output end of the third wavelength division multiplexer is connected with the micro ring in the light path.

[0021] Further, the full-optical modulation module comprises a fourth wavelength division multiplexer, an optical isolator, a third optical coupler, a second optical fiber, a second variable optical attenuator, a first Faraday rotating mirror and a second Faraday rotating mirror.

[0022] The first input end of the fourth wavelength division multiplexer is arranged on the light path of the output end of the pump light generator, the second input end of the fourth wavelength division multiplexer is arranged on the light path of the output end of the signal light generator, the fourth wavelength division multiplexer, the optical isolator and the third optical coupler are sequentially connected in the light path, one end of the second optical fiber is arranged on the same light path as the second end of the third optical coupler, the first Faraday rotating mirror reflects the light from the light path on one side of the second optical fiber, one end of the second variable optical attenuator is connected with the third end of the third optical coupler in the light path, the second Faraday rotating mirror reflects the light from the light path on one side of the second variable optical attenuator, and the fourth end of the third optical coupler is electrically connected with the output end of the video signal decoding module.

[0023] Further, the first optical fiber is a hollow core optical fiber, and the hollow core optical fiber is filled with high-entropy Mxene nonlinear two-dimensional material.

[0024] Further, the video signal decoding module comprises an oscilloscope and a video signal decoder.

[0025] The input end of the oscilloscope is connected with the output end of the full-optical modulation module, the output end of the oscilloscope is connected with the input end of the video signal decoder, and the modulated pulse electrical signal is presented in the form of time domain.

[0026] The video signal decoder is used for demodulating the modulated pulse electrical signal into a second video signal.

[0027] Further, the video signal decoding module further comprises an information processing module, and the information processing module comprises an error detection module and a feedback optimization module.

[0028] The error detection module is connected with the signal transmission end of the video signal decoder, is used for extracting error characteristics of the second video signal and a first video signal, and obtains error characteristic information.

[0029] One end of the feedback optimization module is connected with the error detection module, and the other end of the feedback optimization module is connected with the video signal coding module, for analyzing error characteristic information, identifying error mode, and outputting corresponding feedback signal under error mode to the video signal coding module.

[0030] A video transmission method using the video transmission device, the video transmission method comprising:

[0031] The video signal module provides a first video signal, the first video signal is preprocessed to obtain a control signal, and the control signal is input into the signal generation module;

[0032] The signal generation module generates pump light and signal light required for all-optical modulation, generates pump light of corresponding pulse sequence according to the control signal, and simultaneously generates signal light;

[0033] The pump light and the signal light are incident from one side into the all-optical modulation module, the pump light modulates the signal light, obtains a modulated pulse light signal consistent with the waveform of the pump light, and transmits the modulated pulse light signal, the modulated pulse light signal is converted into a modulated pulse electrical signal after transmission ends;

[0034] The modulated pulse electrical signal is demodulated and decoded into a second video signal in the video signal decoding module.

[0035] A video transmission system comprising the video transmission device, at least one video signal generation device, and at least one video signal receiving device, wherein the video signal generation device is connected with the input end of the video signal coding module of the video transmission device, and the video signal receiving device is connected with the output end of the video signal decoding module of the video transmission device.

[0036] The present invention provides a video transmission device, method and system, wherein the video transmission device includes: a video signal encoding module, a signal generating module, an all-optical modulation module and a video signal decoding module; the output end of the video signal encoding module is electrically connected to the input end of the signal generating module, and is used to provide a first video signal and pre-process the first video signal to obtain a control signal; the signal generating module is used to generate signal light and convert the control signal into pump light of a corresponding pulse sequence, and transmit it to the light incident side of the all-optical modulation module; the all-optical modulation module is electrically connected to the input end of the video signal decoding module, and is used to modulate the signal light based on the power of the pump light to obtain a modulated pulse light signal consistent with the pump light waveform, and is used to convert the modulated pulse light signal into a modulated pulse electrical signal after transmission, and output it to the video signal decoding module; the video signal decoding module is used to demodulate and decode the modulated pulse electrical signal into a second video signal. The present invention uses all-optical modulation technology in the signal modulation part, directly modulating optical signals with optical signals to achieve the transmission of video signals, thereby avoiding the conversion process between photoelectric and electro-optical signals and improving the modulation speed. Compared with the use of electro-optical modulators, the present invention also reduces overall transmission loss and increases bandwidth, thereby improving the signal-to-noise ratio of video transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary personnel in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0038] Figure 1 It is a structural diagram of a video transmission device in a preferred embodiment of the present invention.

[0039] Figure 2 It is an interference spectrum diagram of a video transmission device in a preferred embodiment of the present invention.

[0040] Figure 3 This is a diagram showing the intensity modulation results of a video transmission device in a preferred embodiment of the present invention.

[0041] Figure 4 It is a structural diagram of a video transmission device in another preferred embodiment of the present invention.

[0042] Figure 5 It is a structural diagram of a video transmission device in another preferred embodiment of the present invention.

[0043] 100, video signal encoding module; 110, video signal source; 120, video signal encoder; 200, signal generating module; 210, pump light generator; 220, signal light generator; 300, all-optical modulation module; 311, first optical coupler; 312, first wavelength division multiplexer; 313, first optical fiber; 314, second wavelength division multiplexer; 315, delay line; 316, first variable optical attenuator; 317, polarization controller; 318, second optical coupler; 321, third wavelength division multiplexer; 322, micro-ring; 331, fourth wavelength division multiplexer; 332, optical isolator; 333, third optical coupler; 334, second optical fiber; 335, second variable optical attenuator; 336, first Faraday rotator mirror; 337, second Faraday rotator mirror; 400, video signal decoding module; 410, oscilloscope; 420, video signal decoder; 430, information processing module. DETAILED DESCRIPTION

[0044] The present application provides a video transmission device, method and system, in order to make the purpose, technical scheme and effect of the present application more clear and explicit, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0045] In the embodiments and patent claims, unless the article is specifically limited in the text, "one", "an", "said" and "the" can also include plural forms. If the description of the embodiments of the present application involves "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0046] It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or their combinations. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be intermediate elements. In addition, "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any unit and all combinations of the associated listed items.

[0047] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the present application. It should also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless specifically so defined herein.

[0048] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0049] In traditional information processing and communication systems, electro-optical modulators play a key role in modulating optical signals by electrical signals to realize data transmission. However, with the increase of communication rate and the explosive growth of data volume, electro-optical modulators face some bottlenecks: the speed of electronic components is limited by the bandwidth of electrical signal transmission, which is difficult to meet the demand of high-speed data processing; the electrode and optical waveguide structure of the electro-optical modulator usually form a capacitive load, which can be equivalent to a capacitor C, and the driving process of the capacitive load can be regarded as the periodic charging and discharging of the equivalent capacitor, and the energy consumption of each charging and discharging is P0=0.5*C*V 2 , wherein V is the voltage in the circuit, and C is the capacitance value of the equivalent capacitor. In specific implementation, the electro-optical modulator charges and discharges twice in each period with positive and negative voltage switching, so the dynamic power consumption of the capacitive load in one period is: P=C*V 2 *f, wherein f is the signal frequency. The power consumption of the electro-optical modulator increases linearly with the frequency, thereby increasing the power consumption in the high-speed scenario. At the same time, the modes of optical fibers and waveguides usually differ, especially in core size, refractive index distribution and mode propagation constant. Since the mode of the optical fiber is usually circular, while the mode of the waveguide may be rectangular or other asymmetric shapes, if the mode of the optical fiber and the mode of the waveguide cannot be well matched, a part of the light energy cannot be effectively transmitted when the light is coupled from the optical fiber to the waveguide or vice versa, resulting in coupling loss. When the incident angle of the optical fiber and the waveguide is not suitable, part of the light will be reflected back to the optical fiber or scattered into the surrounding medium, also causing a decrease in coupling efficiency and leading to signal loss.

[0050] On the basis of the prior art, such as Figure 1As shown, the application provides a video transmission device, which fully photonizes a modulator, comprising a video signal encoding module 100, a signal generating module 200, an all-optical modulation module 300 and a video signal decoding module 400; wherein the output end of the video signal encoding module 100 is electrically connected with the input end of the signal generating module 200, for providing a first video signal and pre-processing the first video signal to obtain a control signal; the signal generating module 200 is used for generating signal light and converting the control signal into a corresponding pump light pulse sequence, and emitting to the light input side of the all-optical modulation module 300; the all-optical modulation module 300 is electrically connected with the input end of the video signal decoding module 400, for modulating the signal light based on the power of the pump light to obtain a modulated pulse light signal consistent with the waveform of the pump light, and for converting the modulated pulse light signal into a modulated pulse electrical signal after transmission and outputting to the video signal decoding module 400; the video signal decoding module 400 is used for demodulating and decoding the modulated pulse electrical signal into a second video signal.

[0051] In specific implementation, the video signal encoding module 100 photoelectrically converts the first video signal, pre-processes and encodes the first video signal to obtain a control signal suitable for all-optical modulation, the control signal is an electrical signal, and the control signal is output to the signal generating module 200. The signal generating module 200 outputs the corresponding pump light pulse sequence and signal light according to the control signal, and inputs the pump light into the all-optical modulation module 300 to modulate the pump light onto the signal light, so that the pump light is modulated from continuous light to pulse light, obtaining a modulated pulse light signal with the same period as the signal light and transmitting, the modulated pulse light signal is converted into a modulated pulse electrical signal after transmission, and is input into the video signal decoding module 400. The video signal decoding module 400 can include a computer or a microprocessor, demodulates and decodes the received modulated pulse electrical signal to obtain a second video signal, and outputs a completed video picture stream; at the same time, compares the error between the second video signal and the initial first video signal parameter, and outputs a feedback signal to the input end of the video signal encoding module 100 according to the comparison result, so as to realize dynamic optimization of the working parameters of the all-optical modulation video transmission device.

[0052] Further, the video signal encoding module 100 comprises a video signal source 110 and a video signal encoder 120; wherein the output end of the video signal source 110 is electrically connected with the input end of the video signal encoder 120, for generating a first video signal to be transmitted; the output end of the video signal encoder 120 is electrically connected with the input end of the signal generation module 200, for pre-processing the first video signal, compressing the first video signal, and obtaining a control signal. Specifically, the video signal source 110 provides a video signal to be transmitted, and the first video signal can be a video signal collected by the video signal source 110 through wired or wireless transmission technology, such as ultra-high-definition video, real-time streaming media, etc. Then, the video signal encoder 120 pre-processes the light domain of the first video signal. The first video signal is the superposition of multiple image information within a certain time, and the image is composed of pixels. Here, the RGB model is used to represent the color of the image, and the value range of each component is usually 0 to 255. Eight-bit binary is used to represent each component. The light domain refers to the sum of these pixel points. Converting each pixel point of the image into a corresponding binary value is the light domain pre-processing of the video signal. And using H.265 or AV1 encoding to compress and convert the video signal into a digital or analog signal suitable for all-optical modulation to obtain the control signal, and storing the encoded control signal into a program file.

[0053] Further, the signal generation module 200 comprises a pump light generator 210 and a signal light generator 220; wherein the input end of the pump light generator 210 is electrically connected with the output end of the video signal encoding module 100, the output end of the pump light generator 210 is connected with the all-optical modulation module 300, for generating pump light according to the control signal and outputting; the input end of the signal light generator 220 is electrically connected with the output end of the video signal encoding module 100, the output end of the signal light generator 220 is connected with the all-optical modulation module 300, for generating signal light and outputting.

[0054] In some preferred embodiments of the present application, the pump light generator 210 is a 980 nm pulsed laser. The 980 nm band is suitable for most pulsed lasers, and most materials respond well to this band, which is universal. Specifically, the 980 nm pulsed laser reads the programmed program file provided by the video signal encoder 120, and outputs the pump light according to the program. The signal light generator 220 uses a 1550 nm light source to provide a high-quality optical signal as a carrier for video signal modulation. Further, the signal light generator 220 can also use other narrow-band lasers, such as a distributed feedback laser (DFB), which is not limited here. The signal light generator 220 uses a typical wavelength range in the communication band, which meets the high stability and low noise characteristics of all-optical modulation to ensure transmission quality.

[0055] Further, the all-optical modulation module 300 includes: a first optical coupler 311, a first wavelength division multiplexer 312, a first optical fiber 313, a second wavelength division multiplexer 314, a delay line 315, a first variable optical attenuator 316, a polarization controller 317, and a second optical coupler 318; the first optical coupler 311 is arranged on the optical path of the output end of the signal light generator 220, the first input end of the first wavelength division multiplexer 312 is arranged on the optical path of the first output end of the first optical coupler 311, the second input end of the first wavelength division multiplexer 312 is arranged on the optical path of the output end of the pump light generator 210, the first wavelength division multiplexer 312, the first optical fiber 313, the second wavelength division multiplexer 314, and the first input end of the second optical coupler 318 are connected in sequence on the optical path; the delay line 315 is arranged on the optical path of the second output end of the first optical coupler 311, the delay line 315, the first variable optical attenuator 316, the polarization controller 317, and the second input end of the second optical coupler 318 are connected in sequence on the optical path, and the output end of the second optical coupler 318 is electrically connected to the output end of the video signal decoding module 400.

[0056] In some preferred embodiments of the present application, the all-optical modulation module 300 employs a Mach-Zehnder interferometer (MZI) based all-optical modulator. The Mach-Zehnder interferometer utilizes the interference principle to control the intensity of the output light by phase difference, thus realizing the modulation of the signal. The Mach-Zehnder interferometer has simple structure, can be connected in multiple stages, has comb and band-pass filtering characteristics, and has excellent extinction ratio, thus realizing high contrast ratio when switching between the "on" and "off" states of the light, and providing high-quality signal output. For the modulated signal in video transmission, such high contrast ratio ensures the clarity of the video picture and the integrity of the signal. Meanwhile, the Mach-Zehnder interferometer has low insertion loss, can effectively utilize most of the power of the input light signal, and is easy to integrate with other optical devices such as wavelength division multiplexer and amplifier to form a photonic device on a chip, thus being suitable for high-density integrated all-optical communication system.

[0057] Specifically, in the present application, the power of the pump light is used to realize intensity modulation. If the pump light is periodically output at a certain fixed pulse power, the signal light will also be output at the same period, and the signal light is modulated from continuous light to pulsed light to obtain the modulated pulsed light signal. The pump light generator 210 and the signal light generator 220 are set, and the pump light generator 210 and the signal light generator 220 respectively emit pump light with a center wavelength of 980 nm and signal light with a center wavelength of 1550 nm, wherein the pump light is pulsed light, and the signal light is narrow-band continuous light. When the signal light passes through the first optical fiber 313, part of the light will be absorbed, resulting in attenuation of the light intensity in the arm where the first optical fiber 313 is located. Therefore, the 1550 nm signal light is divided into two paths at the first optical coupler 311 in a ratio of 9:1, and is transmitted along the two arms of the Mach-Zehnder interferometer respectively, so as to compensate the light intensity in the arm where the first optical fiber 313 is located, and make the light intensities of the two arms of the Mach-Zehnder interferometer consistent.

[0058] One arm of the Mach-Zehnder interferometer is equipped with a first wavelength division multiplexer 312, a second wavelength division multiplexer 314, and a first optical fiber 313. The first optical fiber 313 is a micro-nanoscale hollow-core fiber filled with a high-entropy transition metal carbon / nitride (MXene) nonlinear two-dimensional material. This high-entropy MXene nonlinear two-dimensional material has a typical two-dimensional layered structure and effectively shields electromagnetic waves. A 0.5 g / ml aqueous solution of high-entropy MXene nanosheets is filled into the hollow-core fiber using a pressure differential method. The fiber is then heated on a drying platform for two hours. Finally, a custom ceramic ferrule is used to connect the two ends of the hollow-core fiber to a patch cable. The first optical fiber 313 can be replaced with a D-type fiber, a tapered fiber, or other two-dimensional materials with high nonlinear and photothermal effects, such as graphene, black phosphorus, or transition metal sulfides, without limitation to the present invention. The 980nm pulsed light enters the first optical fiber 313 from the first wavelength division multiplexer 312. Based on the good light-to-heat conversion efficiency of nanomaterials, the two-dimensional nanosheets in the hollow-core fiber generate heat after absorbing the pulsed light, causing the refractive index of the internal material to change, causing the phase of the 1550nm signal light to change accordingly. Specifically, when the temperature of the hollow-core fiber increases, its refractive index changes. This change in refractive index causes the propagation phase of light in the material to change, thereby achieving phase modulation. The phase change ΔΦ caused by temperature change can be expressed as:

[0059]

[0060] Where λ is the wavelength of light, ( ) is the temperature derivative of the refractive index, ΔT is the temperature change, and L is the optical path length. A portion of the 980 nm pump light that has not undergone phase shifting is output from one channel of the second wavelength division multiplexer 314 as residual light, while the phase shifted pump light remains in the optical path and is transmitted to the second optical coupler 318.

[0061] In the other arm of the Mach-Zehnder interferometer, a delay line 315, a first variable optical attenuator 316, and a polarization controller 317 are provided. Delay line 315 is used to change the arm length difference between the interferometer's two arms, thereby controlling the free spectral range. The formula for the arm length difference and free spectral range is as follows:

[0062]

[0063] Among them, λ1 and λ2 are the wavelengths corresponding to the two adjacent maxima in the output interference spectrum, ΔL is the arm length difference, and n is the refractive index of light in the medium. It can be seen that the larger the arm length difference ΔL, the smaller the free spectral range and the lower the interference contrast; the smaller the arm length difference ΔL, the larger the free spectral range and the higher the interference contrast. The coherence length is the length at which the light wave remains relatively stable during propagation. If the arm length difference is too large, exceeding the coherence length of the light signal in the two arms, the interference effect will be weakened. If the arm length difference is too small, that is, the free spectral range is too large, a larger pump power is required to switch from high transmittance to low transmittance during intensity modulation. Therefore, it is necessary to adjust the delay line 315 to select a predetermined arm length difference, so as to find the maximum contrast at the corresponding switching power.

[0064] To ensure the optimal operating state of the all-optical modulation module 300, the parameters of the first variable optical attenuator 316 and the polarization controller 317 need to be debugged. During the debugging process, the output end of the second optical coupler 318 is connected to a spectrometer to facilitate the determination of the debugging results. The first variable optical attenuator 316 is used to adjust the intensity of the two optical signals to be as equal as possible. The polarization controller 317 uses a three-ring structure, controlling the polarization state of light by adjusting the rotation angles of the three rings to ensure that the polarization states of the two optical signals are the same. When the intensity and polarization states of the two optical signals are the same, the interference contrast of the interference spectrum output by the all-optical modulation module 300 is adjusted to its maximum value.

[0065] The output end of the second optical coupler 318 is connected to the video signal decoding module 400, and the two optical signals are combined at the second optical coupler 318. The second optical coupler 318 serves as a beam splitter / combiner, configured to cause a phase shift of π / 2 after cross-coupling between the two optical signals, thereby making the two optical signals complementary. Furthermore, the all-optical modulation module 300 also includes a photodetector (not shown in the figure), one end of which is optically connected to the output end of the second optical coupler 318, and the other end of which is electrically connected to the video signal decoding module, for converting the two optical signals into electrical signals. The electrical signal is a modulated pulse electrical signal, and the photodetector outputs the modulated pulse electrical signal to the video signal decoding module 400.

[0066] Figure 2 The figure shows the interference spectrum at the output end of the second optical coupler in the present invention. Output 1 and Output 2 are the optical signals at the first and second output ends of the second optical coupler 318, respectively. It can be seen that the interference contrast ratio in the present invention exceeds 20 dB, which is higher than the 15 dB typical interference contrast ratio of all-optical modulators in the prior art. This demonstrates that the present invention can ensure the transmission quality of video signals in the all-optical modulation device. Figure 3The intensity modulation result diagram output by the video transmission device in the application is shown in the state of 52mW pump light and 25bit / s, the vertical coordinate axis is the relative intensity of different light signal waveforms, the first row of waveforms is the original waveform of the pump light, the meaning represented by the output ASCII code is "AOM", and it can be seen that the stable transmission of the video signal can be realized in the application. The waveforms of the second and third rows are the waveforms of the modulated light signals, and it can be seen that the waveforms of output 1 and output 2 are complementary under the action of the second optical coupler 318, and each bit of output 2 is the bit inversion operation of the corresponding bit of output 1, which has potential application prospects in the negative logic system.

[0067] Further, the video signal decoding module 400 comprises an oscilloscope 410 and a video signal decoder 420; wherein the input end of the oscilloscope 410 is electrically connected with the output end of the all-optical modulation module 300, the output end of the oscilloscope 410 is electrically connected with the input end of the video signal decoder 420, and the oscilloscope 410 is used for presenting the modulated pulse electrical signal in the time domain; the video signal decoder 420 is used for demodulating the modulated pulse electrical signal into a second video signal;

[0068] In further embodiments of the application, the video signal decoding module 400 further comprises an information processing module 430, which is electrically connected with the output end of the video signal encoding module 100, and is used for comparing the second video signal with the first video signal, and outputting a feedback signal to the video signal encoding module 100 according to the comparison result. The pulse signal received on the oscilloscope 410 is presented on the screen in the time domain, the original video signal is recovered by demodulating the signal by using the video signal decoder 420, the second video signal is obtained, and the lost information in the compression process is inversely restored by using the decoder to provide a complete picture stream. The information processing module 430 communicates with the oscilloscope 410, reads the modulated light signal, uses an AI algorithm such as deep learning or a negative feedback neural network parameter adjustment method, fits the input and output algorithm by calculating the correlation, dynamically optimizes the working parameters of the all-optical modulator, feeds back to the encoder, and adjusts the output parameters of the pump light such as the center wavelength and the intensity, so as to adapt to the changes of the network conditions and the transmission video content, thereby approaching the ideal output effect.

[0069] Furthermore, the information processing module 430 includes an error detection module and a feedback optimization module (not shown). The error detection module is connected to the video signal decoder 420 and is configured to extract error features between the second video signal and the first video signal to obtain error feature information. One end of the feedback optimization module is connected to the error detection module, and the other end is connected to the output of the video signal encoding module 100. The module is configured to analyze the error feature information and output a corresponding feedback signal to the video signal encoding module 100. Specifically, the error detection module extracts error features from the decoded data file. Exemplarily, the error features are derived by measuring the difference between the original signal and the processed signal, and may include image quality indicators such as peak signal-to-noise ratio, structural similarity, blocking artifacts, and blurriness. The feedback optimization module can determine which encoding parameters require adjustment. Optionally, the feedback optimization module may include a deep learning algorithm or a neural network to identify error patterns and predict parameters requiring adjustment. After completing the error analysis, the feedback optimization module processes the generated adjustment suggestions and feeds the results back to the encoder, ensuring that the system can dynamically adjust the encoding strategy based on the error.

[0070] like Figure 4 As shown, in another preferred embodiment of the present invention, the all-optical modulation module 300 includes a third wavelength division multiplexer 321 and a micro-ring 322. The first input end of the third wavelength division multiplexer 321 is disposed in the optical path of the output end of the pump light generator 210, and the second input end of the third wavelength division multiplexer 321 is disposed in the optical path of the output end of the signal light generator 220. The output end of the third wavelength division multiplexer 321 is optically connected to the micro-ring 322, and the micro-ring 322 is electrically connected to the video signal decoding module 400. The structure and operating principle of the micro-ring 322 can be readily understood from the prior art and will not be further described here.

[0071] like Figure 5As shown, in another preferred embodiment of the present application, the all-optical modulation module 300 comprises: a fourth wavelength division multiplexer 331, an optical isolator 332, a third optical coupler 333, a second optical fiber 334, a second variable optical attenuator 335, a first Faraday rotating mirror 336 and a second Faraday rotating mirror 337; wherein the first input end of the fourth wavelength division multiplexer 331 is arranged on the optical path of the output end of the pump light generator 210, the second input end of the fourth wavelength division multiplexer 331 is arranged on the optical path of the output end of the signal light generator 220, the fourth wavelength division multiplexer 331, the optical isolator 332 and the third optical coupler 333 are connected in sequence on the optical path, one end of the second optical fiber 334 is arranged on the same optical path as the second end of the third optical coupler 333, the first Faraday rotating mirror 336 reflects the light from the side of the second optical fiber 334, one end of the second variable optical attenuator 335 is connected to the third end of the third optical coupler 333 on the optical path, the second Faraday rotating mirror 337 reflects the light from the side of the second variable optical attenuator 335, and the fourth end of the third optical coupler 333 is electrically connected to the output end of the video signal decoding module 400. Specifically, the second variable optical attenuator 335 can be used to balance the intensity of the two optical signals of the interferometer to achieve the best interference contrast. The Faraday rotating mirror acts as a mirror, and through the polarization non-reciprocity operation of the Faraday device, the polarization state is stabilized and the external environmental interference is reduced. After the pump light passes through the second optical fiber 334, the second optical fiber 334 produces periodic refractive index changes, and the signal light is modulated into a pulse signal with the same period, which is the modulated pulse optical signal. Alternatively, the second optical fiber 334 is prepared in the same way as the first optical fiber 313 described above, and the second optical fiber 334 is a hollow core optical fiber filled with high-entropy Mxene nonlinear two-dimensional material inside. The other working principles are the same as those of the all-optical modulator based on the Mach-Zehnder interferometer, and will not be repeated here.

[0072] The application further discloses a video transmission method using the video transmission device.

[0073] The video signal module provides a first video signal, which is preprocessed to obtain a control signal and input into the signal generation module.

[0074] The signal generation module generates pump light and signal light required for all-optical modulation, generates pump light with a corresponding pulse sequence according to the control signal, and simultaneously generates signal light.

[0075] The pump light and the signal light are incident from one side of the all-optical modulation module, the pump light modulates the signal light, and a modulated pulse light signal consistent with the waveform of the pump light is obtained and transmitted, and the modulated pulse light signal is converted into a modulated pulse electrical signal after transmission.

[0076] The modulated pulse electrical signal is demodulated and decoded into a second video signal in the video signal decoding module. The second video signal is a digital signal for displaying images, and specifically, the second video signal can be a television signal in NTSC, PAL, SECAM format, a fine image signal, a visual television image signal, etc. The video transmission method can be specifically as described in an embodiment of a video transmission line device based on all-optical modulation, which will not be described here again.

[0077] The application further discloses a video transmission system comprising the video transmission device, at least one video signal generating device, and at least one video signal receiving device, the video signal generating device is connected with the video signal encoding module of the video transmission device, and the video signal generating device can be used to transmit the first video signal to the video signal encoding module. The video signal receiving device is connected with the video signal decoding module of the video transmission device, and the video signal receiving device can display the second video signal. The video transmission device can be specifically as described in an embodiment of a video transmission line device based on all-optical modulation, which will not be described here again.

[0078] In summary, the video transmission device, method and system provided by the application have the following advantages: the end-to-end all-optical video transmission is constructed, the modulator is fully photonized, complete information transmission functions are provided, including encoding-modulation-demodulation-decoding of the signal source, and the video signal transmission is realized by using the all-optical modulator. Meanwhile, the all-optical modulation technology is used in the signal modulation part, the optical signal is directly modulated by the optical signal, the conversion process between the photoelectric signal and the electro-optical signal is avoided in the video signal transmission, higher modulation efficiency is realized, the loss is reduced, the bandwidth is improved, and the signal-to-noise ratio in the video transmission process is improved.

[0079] It should be understood that the application of the application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the claims of the application.

Claims

1. A video transmission device, characterized in that: include: Video signal encoding module, signal generation module, all-optical modulation module and video signal decoding module; wherein, The output end of the video signal encoding module is electrically connected to the input end of the signal generating module, and is used to provide a first video signal and pre-process the first video signal to obtain a control signal; The signal generating module is used to generate signal light and convert the control signal into pump light of a corresponding pulse sequence, and transmit it to the light incident side of the all-optical modulation module. The signal generating module includes a pump light generator and a signal light generator; The all-optical modulation module is electrically connected to the input end of the video signal decoding module, and is used to modulate the signal light based on the power of the pump light to obtain a modulated pulse optical signal consistent with the waveform of the pump light, and is used to convert the modulated pulse optical signal into a modulated pulse electrical signal after transmission and output it to the video signal decoding module; the all-optical modulation module includes: a first optical coupler, a first wavelength division multiplexer, a first optical fiber, a second wavelength division multiplexer, a delay line, a first variable optical attenuator, a polarization controller, and a second optical coupler; wherein, the first optical coupler is arranged on the optical path of the output end of the signal light generator, the first input end of the first wavelength division multiplexer is arranged on the optical path of the first output end of the first optical coupler, the second input end of the first wavelength division multiplexer is arranged on the optical path of the output end of the pump light generator, and the first wavelength division multiplexer is arranged on the optical path of the first output end of the first optical coupler. The wavelength division multiplexer, the first optical fiber, the second wavelength division multiplexer and the first input end of the second optical coupler are connected in sequence on the optical path; the delay line is arranged on the optical path of the second output end of the first optical coupler, the delay line, the first variable optical attenuator, the polarization controller and the second input end of the second optical coupler are connected in sequence on the optical path, and the output end of the second optical coupler is electrically connected to the output end of the video signal decoding module; the first optical fiber is a hollow-core optical fiber, and the hollow-core optical fiber is filled with a high-entropy Mxene nonlinear two-dimensional material. The hollow-core optical fiber is obtained by filling a 0.5 g / ml high-entropy Mxene nanosheet aqueous solution into the hollow-core optical fiber by a pressure difference method, and heating it on a drying platform for 2 hours; the high-entropy Mxene nonlinear two-dimensional material has a two-dimensional layered structure characteristic, and shields electromagnetic waves; The video signal decoding module is used to demodulate and decode the modulated pulse electrical signal into a second video signal.

2. The video transmission device according to claim 1, wherein: The video signal encoding module includes a video signal source and a video signal encoder; wherein, The output end of the video signal source is electrically connected to the input end of the video signal encoder, and is used to generate a first video signal to be transmitted; The video signal encoder is electrically connected to the pump light generator and is used to pre-process the first video signal, compress the first video signal, and obtain a control signal; The output end of the pump light generator is connected to the all-optical modulation module, and is used to generate pump light based on the control signal; The output end of the signal light generator is connected to the all-optical modulation module for generating signal light.

3. The video transmission device according to claim 2, wherein: The all-optical modulation module includes: a fourth wavelength division multiplexer, an optical isolator, a third optical coupler, a second optical fiber, a second variable optical attenuator, a first Faraday rotator mirror and a second Faraday rotator mirror; wherein, The first input end of the fourth wavelength division multiplexer is arranged on the optical path of the output end of the pump light generator, the second input end of the fourth wavelength division multiplexer is arranged on the optical path of the output end of the signal light generator, the fourth wavelength division multiplexer, the optical isolator, and the third optical coupler are connected in sequence on the optical path, one end of the second optical fiber and the second end of the third optical coupler are arranged on the same optical path, the first Faraday rotator reflects the light from the optical path on one side of the second optical fiber, one end of the second variable optical attenuator is connected to the third end of the third optical coupler on the optical path, the second Faraday rotator reflects the light from the optical path on one side of the second variable optical attenuator, and the fourth end of the third optical coupler is electrically connected to the output end of the video signal decoding module; the second optical fiber is a hollow-core fiber, and the hollow-core fiber is filled with a high-entropy Mxene nonlinear two-dimensional material. The hollow-core fiber is obtained by filling a 0.5 g / ml high-entropy Mxene nanosheet aqueous solution into the hollow-core fiber by a pressure difference method and heating it on a drying platform for 2 hours; the high-entropy Mxene nonlinear two-dimensional material has a two-dimensional layered structure characteristic and shields electromagnetic waves.

4. The video transmission device according to claim 1, wherein: The video signal decoding module includes: an oscilloscope and a video signal decoder; wherein, The input end of the oscilloscope is electrically connected to the output end of the all-optical modulation module, and the output end of the oscilloscope is electrically connected to the input end of the video signal decoder, for presenting the modulated pulse electrical signal in a time domain form; The video signal decoder is used to demodulate the modulated pulse electrical signal into a second video signal.

5. The video transmission device according to claim 4, characterized in that The video signal decoding module further includes an information processing module, which includes an error detection module and a feedback optimization module; wherein, The error detection module is connected to the signal transmission end of the video signal decoder and is used to extract error features from the second video signal and the first video signal to obtain error feature information; One end of the feedback optimization module is connected to the error detection module, and the other end of the feedback optimization module is connected to the video signal encoding module, for analyzing error feature information, identifying error patterns, and outputting a feedback signal corresponding to the error pattern to the video signal encoding module.

6. A video transmission method using the video transmission device according to any one of claims 1 to 5, characterized in that: The video transmission method comprises: The video signal module provides a first video signal, the first video signal is pre-processed to obtain a control signal, and is input into the signal generating module; The signal generation module generates the pump light and signal light required for all-optical modulation, generates the pump light of the corresponding pulse sequence according to the control signal, and generates the signal light at the same time; The pump light and the signal light are incident on the all-optical modulation module from one side, the pump light modulates the signal light, and a modulated pulse optical signal consistent with the pump light waveform is obtained and transmitted. After the transmission, the modulated pulse optical signal is converted into a modulated pulse electrical signal; The modulated pulse electrical signal is demodulated and decoded into a second video signal in a video signal decoding module.

7. A video transmission system, characterized in that: The method comprises the video transmission device according to any one of claims 1 to 5, at least one video signal generating device, and at least one video signal receiving device, wherein the video signal generating device is connected to the input end of the video signal encoding module of the video transmission device, and the video signal receiving device is connected to the output end of the video signal decoding module of the video transmission device.

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