Lens retreat structure

The invention discloses a lens withdrawal structure, comprising two sliding parts which are arranged on a lens group unit, two elastic parts by which the lens group unit can be connected with a drawtube, two sliding supporting parts which are arranged on a fixed base, and two track control parts which are arranged on one drawtube, wherein, the two sliding parts can slide stably along the inclined surface of the sliding supporting parts so as to drive the lens group unit to slide to the radial side of the common optical axis. The lens withdrawal structure is applied to a zoomer lens system which is provided with a plurality of lens group units; when the zoomer lens system is in use, the lens group units are arranged on the common optical axis; and when the zoomer lens system is not in use and requires to be withdrawn, one lens group unit slides to the radial side of the common optical axis by the lens withdrawal structure.

Reversibly contained lens module

Signal receiving method and system for receiving end of optical fiber transmission system

The invention discloses a signal receiving method and system for a receiving end of an optical fiber transmission system, and relates to the field of signal processing, and the method comprises the steps: obtaining constellation point data of the receiving end of the optical fiber transmission system; filtering the constellation point data to obtain a pre-filtering signal; dividing the pre-filtering signal into a training signal and a test signal; determining a judgment threshold value according to the training signal; if the test signal is within the threshold interval of the judgment threshold, performing first judgment output on the test signal by adopting a direct hard judgment mode; if the test signal is not in the threshold interval of the judgment threshold, filtering the test signal by adopting a post-filter, and performing second judgment output by adopting an MLSE judgment mode; and combining the first judgment output and the second judgment output to serve as a judgment receiving ...

Method for automatically mounting software program

The method for automatically mounting software program in the between of a computer system and a game carrier to be mounted includes the following steps: making said computer system detect a characteristic value of said game carrier to be mounted; utilizing said characteristic value to make comparison with game software mounting data base in said computer system so as to further obtain a correspondent game software mounting data; and making said computer system utilize said game software mounting data to automatically mount a game software to be mounted no game carrier in said computer system.

Two-photon vector radio frequency signal generation method

The invention relates to a two-photon vector radio frequency signal generation method, and belongs to the technical field of radio-over-fiber communication systems. According to the invention, by means of a DSM technology which can convert any real signal into a digital sequence only containing + 1 and-1, and an optical I/Q modulation and homodyne coherent detection architecture which can realize baseband optical QPSK signal generation and detection; according to the invention, two mutually independent vector radio frequency waves with different carrier frequencies, different modulation formats and different baud rates are flexibly provided for a radio-over-fiber communication system. The two paths of mutually independent vector radio frequency waves can carry very high-order QAM (Quadrature Amplitude Modulation) signals. The two paths of mutually independent vector radio frequency waves can both adopt single-carrier modulation or OFDM modulation, or can adopt single-carrier modulation ...

Optical fiber nonlinear equalization method based on WideDeep-CNN (Convolutional Neural Network)

According to the invention, the method is based on Wideamp; the invention discloses an optical fiber nonlinear equalization method of a Deep-CNN, and belongs to the technical field of optical fiber communication. The implementation method comprises the following steps: constructing a first characteristic sequence and a second characteristic spectrum of each M-QAM signal, and constructing a training data set; the construction is based on the Wideamp; a nonlinear equilibrium model of the Deep-CNN model is adopted, and the first feature sequence is adopted as a Wideamp; an input feature sequence of a Wide network sub-model in the Deep-CNN model, and the second feature spectrum are used as Wide amp; an input characteristic spectrum of a Deep-CNN sub-model in the Deep-CNN model is obtained; using the training data set to train the Widamp; a Deep-CNN model is used for training; the features of each M-QAM signal to be subjected to nonlinear equalization are input into the trained Wideamp; the ...

Probe structure of infrared ear thermometer

The invention discloses a probe structure of an infrared ear thermometer. The probe structure is designed by using heat transfer principles to enable a thermistor to truly and rapidly reflect the actual temperature of the cold jointing end of a thermopile; therefore, the measurement error of the infrared ear thermometer can be minimized in the environment with varying temperature.

Hybrid coding and decoding method and device based on sub-constellation space

The invention provides a hybrid coding and decoding method and device based on a sub-constellation space, and the method comprises the steps: generating bit information, and separating the bit information into two paths of signals; lDPC and Polar coding are carried out on the two paths of signals respectively, and polarization multiplexing processing is carried out to obtain X polarization and Y polarization; determining whether to perform amplitude translation on the Y polarization based on the constellation segmentation results of the X polarization and the Y polarization, and outputting a signal; the laser is loaded to the laser for transmission; during receiving, the signal is separated into a 4D signal generated by X polarization, a 4D signal generated by Y polarization and a four-phase phase shift keying signal; calculating the log-likelihood ratio of each bit in each symbol; determining bit data of each symbol based on a log-likelihood ratio to obtain X polarization and Y polarization ...

Ultra-high-order QAM modulation transmission system and method based on pre-equalization

The invention provides an ultra-high-order QAM modulation transmission system and method based on pre-equalization, and the system comprises a transmitting end algorithm module which comprises a pre-equalization processing layer, the pre-equalization processing layer processes a to-be-transmitted data matrix based on a weight matrix, and the weight matrix transmits the to-be-transmitted data matrix to the transmitting end algorithm module after the to-be-transmitted data matrix is processed each time; updating the weight matrix based on the number of 0 taps in the weight matrix; the data transmitting module comprises an arbitrary wave generator and an IQ modulator, and the data transmitting module outputs data through the arbitrary wave generator and the IQ modulator; the data receiving module comprises a coherent receiver and an oscilloscope, the coherent receiver is connected with the IQ modulator through a transmission optical fiber, and the transmitted data are sequentially processed ...

Insensitive electric igniter for nuclear blast valve

Delay redundancy time sensitive flow scheduling method for end-to-end cooperative synchronization

The invention discloses an end-to-end cooperative time delay redundancy time sensitive flow scheduling method, and belongs to the field of optical networks and industrial internet. On the basis of a ring queue and a forwarding model, two queues used for transmitting time trigger streams in the forwarding model are expanded into three queues, one of the queues is an alternative queue, and the time trigger streams rushing into the alternative queue are transmitted in the next time slot; the flow queue priority timed conversion is triggered through the buffer area time of the switch to ensure that the node data packet of the switch is transmitted within two periods; in an optical network scene, time delay redundancy time sensitive flow scheduling of end-to-end cooperation is realized based on a time sensitive network, a special alternative queue is set for a time trigger flow by improving a traditional ring queuing and forwarding model, a protected transmission window is provided for the time ...

Geometry-probability shaping optical signal generation method based on automatic encoder

The invention discloses a geometric-probability shaping optical signal generation method based on an automatic encoder, and belongs to the field of optical communication. An optical signal is generated through an automatic encoder, the generated signal is continuously updated through the iterative training process of the automatic encoder, an optical signal modulation method suitable for a transmission channel is obtained after training of the automatic encoder is completed, and low-dimensional information of the automatic encoder is reconstructed back to a high-dimensional expression through a decoder; the automatic encoder predicts an input regression task and is responsible for automatically constructing a transmitting constellation, enabling transmitting bits to correspond to constellation generation points, adding damage to a transmitting signal through an optical fiber channel, and restoring a receiving signal into a bit sequence through a decoder. According to the method, the influence ...

Insensitive electric igniter for nuclear blast valve

The invention discloses an insensitive electric igniter for a nuclear blast valve, which is suitable to be used for nuclear power generating units. The electric igniter comprises an electrode plug, a charging cap, a bridge belt and charged powder, wherein the electrode plug, the charging cap, the bridge belt and the charged powder are all arranged in a shell; and the electric igniter is characterized in that the charging cap is made of aluminium oxide ceramics, and an electrostatic discharging channel is formed between an electric contact pin on the electrode plug and the inner wall of the shell by a second disk with minimum diameter on the charging cap, thereby combining the functions of 'blocking' and 'discharging'; the charged powder is a Zr/KClO4 medicament which can bear long-time high temperature and irradiation environment; and the bridge belt is serialized, and can satisfy the applied objects with different dimensional requirements for interfaces. The invention provides an electric ...

Optical communication system channel construction method based on deep learning

The invention discloses an optical communication system channel construction method based on deep learning, and belongs to the field of optical communication. The implementation method comprises the steps that a conditional generative adversarial network is adopted to construct an optical communication system channel, a joint loss function containing optimization of multiple sets of loss functions is constructed, and the multiple sets of loss functions comprise mean square error loss, adversarial loss and mean absolute error loss. The conditional generative adversarial network comprises a generator and a discriminator, data distribution at the receiving end and the transmitting end of the optical communication system is captured through the generator, and receiving end new data with the same distribution is generated and used for confusing the discriminator; the discriminator discriminates generated false data and real receiving end data, and when the discriminator reaches Nash equilibrium ...

Nonlinear damage equalization method for modular division multiplexing communication system

The invention discloses a nonlinear damage equalization method for a mode division multiplexing communication system, and belongs to the field of optical fiber communication. The implementation method comprises the following steps that: an OAM-MDM optical fiber communication system sends and receives a pulse amplitude modulation (PAM) signal sequence, and constructs a data feature vector by using a received PAM data symbol; training the equalizer by using the training data set; and inputting the test data set into the AffityNet equalizer to obtain a predicted value of the signal, thereby realizing high-accuracy data recovery. The AffityNet establishes an accurate nonlinear model by using a'small sample ', and has relatively high generalization ability to predict the random feature nonlinearity of the OAM-MDM. And the AffityNet nonlinear equalizer can effectively compensate the random nonlinearity in the OAM-MDM system through a nonlinear model learned by a small sample. According to the ...

Optical signal generation method for bit reconstruction

The invention provides a bit reconstruction optical signal generation method, and relates to the field of optical fiber communication systems. The method comprises the following steps: processing a transmitting end signal by using an enhanced correlation coding circuit to obtain a signal with strong correlation; performing constellation mapping according to a partition mapping unit rule to obtain binary information bits after bit reconstruction; and modulating the signal by using optical modulation to obtain a bit-reconstructed optical signal. The optical system signal generated by the method provided by the embodiment of the invention can still realize lower error codes at a receiving end through transmission of an optical fiber channel, so that the transmission reliability of the system is effectively improved, and the purpose of reducing the sending power of the system is achieved.

Photon radio frequency signal generation method based on pre-coding and probabilistic shaping joint optimization

The invention discloses a method for generating a photon radio frequency signal based on precoding and probability shaping joint optimization, and belongs to the field of communication. The implementation method comprises the following steps of: splitting a binary information sequence into a basic layer sequence and a processing layer sequence; a processing layer sequence is input into a distribution matcher to generate a non-uniform symbol sequence with expected probability distribution, a quadrant bit and an information bit are combined to realize probability shaping, and the information sequence is converted into a PS-QAM signal through QAM modulation; pre-processing the amplitude and phase of the signal by using a pre-coding technology; after the modulation signal and the radio frequency sine wave signal are mixed, a Mach-Zehnder modulator is driven to realize optical carrier suppression modulation on continuous optical waves generated by a distributed feedback laser; optical millimeter ...

Channel construction method of modular division multiplexing communication system

The invention discloses a channel construction method of a mode division multiplexing communication system, and belongs to the field of optical fiber communication. The implementation method comprises the following steps: constructing a condition vector based on a sent M-PAM signal sequence, constructing real data based on the M-PAM signal sequence subjected to synchronous processing, and constructing a training data set based on the condition vector and the real data; an AWCGAN network model used for modular division multiplexing system channel construction is constructed, the condition vector is used as an input feature sequence of a generator network model in the network model, and the real data is used as an input feature sequence of a discriminator network model in the network model; training a network model; and inputting the condition vectors in the test set into the trained generator network, outputting to obtain a prediction signal of each signal, and calculating a normalized mean ...

Optical fiber acoustic sensor based on spiral metamaterial

The invention discloses an optical fiber acoustic sensor based on a spiral metamaterial, and belongs to the field of optical fiber sensing. In order to solve the problem that the sensitivity of an existing acoustic sensor is limited by the lowest pressure detection limit, and consequently the sensitivity of the sensor is low, the optical fiber acoustic sensor based on the spiral metamaterial comprises a quartz capillary tube, a single-mode optical fiber and the spiral metamaterial. The two sides of the quartz capillary tube are connected with the single-mode optical fiber through welding to form a single-mode optical fiber-quartz capillary tube-single-mode optical fiber structure; and the spiral metamaterial surrounds the outer side of the single-mode fiber-quartz capillary-single-mode fiber. The required wavelength range can be determined by changing the spiral length, the spiral stage number and the connection mode of the spiral metamaterial. Within the wavelength range, the spiral metamaterial ...

Lens retreat structure

The invention discloses a lens withdrawal structure, comprising two sliding parts which are arranged on a lens group unit, two elastic parts by which the lens group unit can be connected with a drawtube, two sliding supporting parts which are arranged on a fixed base, and two track control parts which are arranged on one drawtube, wherein, the two sliding parts can slide stably along the inclinedsurface of the sliding supporting parts so as to drive the lens group unit to slide to the radial side of the common optical axis. The lens withdrawal structure is applied to a zoomer lens system which is provided with a plurality of lens group units; when the zoomer lens system is in use, the lens group units are arranged on the common optical axis; and when the zoomer lens system is not in use and requires to be withdrawn, one lens group unit slides to the radial side of the common optical axis by the lens withdrawal structure.

Optical fiber nonlinear equalization method based on WideDeep model

The invention discloses a wireless communication method based on a Wideamp; the invention discloses an optical fiber nonlinear equalization method of a Deep model, and belongs to the technical field of optical fiber communication. The implementation method comprises the following steps: constructing a first feature sequence and a second feature sequence of each M-QAM signal, and constructing a training data set; the construction is based on the Wideamp; a nonlinear equilibrium model of the Deep model is adopted, and the first feature sequence is adopted as Wideamp; an input feature sequence and a second feature sequence of a Wide network sub-model in the Deep model are used as Wide amp; an input feature sequence of a Deep network sub-model in the Deep model; using the training data set to train the Widamp; the Deep model is trained; the feature sequence of each M-QAM signal to be subjected to nonlinear equalization is input into the trained Wideamp; the Deep model is used for outputting ...

Multiband signal light gain regulation and control device

The invention provides a multiband signal light gain regulation and control device, and the device comprises a wavelength division multiplexer which is used for receiving multiple paths of signal light; the filter is connected with the wavelength division multiplexer through a single-mode optical fiber; the rare earth ion-doped amplifier assembly comprises a bismuth-doped optical fiber amplifier, a thulium-doped optical fiber amplifier and an erbium-doped optical fiber amplifier; the Raman optical fiber amplifier is connected with the rare earth ion doped amplifier assembly through a single-mode optical fiber; and the wavelength division demultiplexer is connected with the Raman optical fiber amplifier through a single-mode optical fiber. According to the invention, the gain spectrum of the signal light of each frequency band is flatter, so that the error rate of the system when the signal light is used for transmitting information is reduced.

Three-dimensional constellation rotation method and device for optical fiber communication system

The invention provides a three-dimensional constellation rotation method and device for an optical fiber communication system, and the method comprises the steps: carrying out the three-dimensional constellation mapping of a to-be-transmitted optical fiber communication signal in the optical fiber communication system, and obtaining a constellation point sequence of a three-dimensional space; sequentially performing constellation rotation and constellation interleaving processing on the constellation point sequence to obtain a corresponding target constellation point sequence; and performing up-sampling processing on the target constellation point sequence to generate a modulation signal corresponding to the optical fiber communication signal, so that the modulation signal is transmitted in the optical fiber channel. According to the invention, three-dimensional constellation rotation for the optical fiber communication system can be realized, and the probability of simultaneous information ...

Nonlinear compensation method of LCRF optical fiber transmission system

The invention discloses a nonlinear compensation method of a linear LCRF optical fiber transmission system, and belongs to the technical field of optical fiber communication. According to the method, an LCRF model is adopted, an OAM-MDM-IM/DD optical transmission system is modeled, nonlinear damage compensation is carried out on signals according to the signal damage characteristics of the transmission system, effective balance and damage compensation are achieved, and the bit error rate is reduced; a multiplexing mode is adopted, modeling can be carried out according to different channel conditions of different OAM modes, and different channel conditions can be adaptively coped with; the adopted LCRF model has low requirement on the feature dimension of input data, the requirement can be met by a single sampling signal, the requirement on the sampling rate of the signal is low, the requirement on signal capture hardware such as an oscilloscope is low, and the hardware cost can be reduced ...