858results about "Distortion/dispersion elimination" patented technology

Aspects of the subject disclosure may include, for example, a device including a detector configured to identify a narrow-band absorption occurring within a signal spectrum of an optical signal propagating through a gaseous medium, wherein the optical signal is configured to communicate digital information via an optical communication link including a transmitter, a receiver and an optical transport medium therebetween. The device further includes a mitigation controller configured to control a digital circuit to mitigate at least a portion of a vulnerability of the optical communication link, the vulnerability associated with the narrow-band absorption. Other embodiments are disclosed.

The invention discloses a neural network-based Wollaston series nonlinear compensation method, and the method specifically comprises the steps: enabling a Wollaston integral kernel to be used for initializing the weight of a neural network, and achieving the accurate and efficient nonlinear compensation through training; firstly, a transmission experiment is carried out based on an optical fiber transmission experiment platform, and experiment data are collected from a real-time oscilloscope to construct a training set; and then calculating a Wollaston integral kernel according to the link parameters, applying the Wollaston integral kernel to weight initialization of the neural network, and finally performing iterative updating on the weight parameters of the neural network by using the training data so as to improve the nonlinear compensation performance. Compared with a digital back propagation algorithm, a large number of iteration steps are omitted, single-step compensation is achieved, and the calculation efficiency is greatly improved. In a 12,000 km transmission experiment, the compensation performance superior to that of a digital back propagation algorithm is realized with lower calculation complexity and calculation time delay.

Examples described herein relate to an optical device that entails phase shifting an optical signal. The optical device includes an optical waveguide having a first semiconductor material region and a second semiconductor material region formed adjacent to each other and defining a junction therebetween. Further, the optical device includes an insulating layer formed on top of the optical waveguide. Moreover, the optical device includes a III-V semiconductor layer formed on top of the insulating layer causing an optical mode of an optical signal passing through the optical waveguide to overlap with the first semiconductor material region, the second semiconductor material region, the insulating layer, and the III-V semiconductor layer thereby resulting in a phase shift in the optical signal passing through the optical waveguide.

The invention provides a broadband millimeter wave phased array dispersion effect optimization and adaptive calibration method, and relates to the field of satellite communication. According to the method, a beam pointing error of a millimeter wave satellite communication phased-array antenna caused by a dispersion effect is reduced based on a real-time delay module switched by an optical fiber and an optical switch, and a calibration interval is determined by using a vector average algorithm in combination with working frequency and bandwidth; data obtained after equiphase surface compensation is used as compensation data of a corresponding frequency band to be stored in the antenna, when the antenna works at different frequencies, the pre-stored compensation data in the corresponding frequency band is called according to polarization characteristics, and corresponding resolving phase data of each unit at the current frequency point and pointing direction are superposed to obtain an overlapped resolving phase data; and directional diagram beam pointing under the frequency point is realized. The problem that the antenna beam pointing error is caused by the dispersion of the broadband millimeter wave satellite communication phased-array antenna is solved. According to the method, the beam pointing precision of the millimeter wave satellite communication phased-array antenna is improved, and rapid frequency switching and beam switching are realized.

The invention discloses an optical fiber link management system and method and a nonvolatile storage medium. The system comprises a sensor module, a data processing and analysis module, a fault detection module, a state adjustment module and a maintenance module, and the sensor module is used for transmitting a signal to an optical fiber link and receiving a reflection signal from the optical fiber link; the data processing and analyzing module is used for receiving the data of the reflected signal transmitted by the sensor module and carrying out noise reduction processing and data cleaning on the data of the reflected signal to obtain target data; determining optical fiber link state data according to the target data; the fault detection module is used for determining a threshold detection result according to the link state data and a preset threshold; and the state adjusting module is used for adjusting the optical fiber connection parameters of the optical fiber link according to the link state data. The technical problems that existing optical fiber link management depends on manpower, and the management efficiency is low due to the low integration level are solved.

The embodiment of the invention discloses a signal processing method and a related device. The signal processing method can be applied to an optical communication scene. The method provided by the embodiment of the invention comprises the following steps: a sending end upsets the polarity of a part of symbols in a first modulation signal to obtain a second modulation signal, so that the absolute value of the sum of the values of all the symbols in the second modulation signal is smaller than the absolute value of the sum of the values of all the symbols in the first modulation signal. Therefore, the suppression of the low-frequency part power in the second modulation signal is realized, and the receiving end can carry out direct current removal processing on the signal to resist the influence of low-frequency noise in a channel on the transmission performance. And the receiving end carries out inverse transformation of power spectrum adjustment on the received signal according to the identification information, so that the original signal before the sending end carries out the power spectrum adjustment is recovered and obtained.

The invention discloses a method, a system and related equipment. The controller can determine a first optical channel in a first time slot between an optical transmitting device and an optical receiving device according to a data transmission request, and then sends configuration information to the optical transmitting device to instruct the optical transmitting device and / or the optical receiving device to transmit data in the first time slot according to an amplitude compensation coefficient of the first optical channel. Amplitude distortion introduced by the first optical channel can be compensated, and the bit error rate is reduced.

The invention provides a well drilling anti-interference communication system based on a VCSEL (Vertical Cavity Surface Emitting Laser), the VCSEL and a manufacturing method thereof, and the manufacturing method comprises the following steps: calculating the light field intensity distribution of a high-order transverse mode through an intrinsic mode expansion method and a Laguerre-Gaussian model based on the epitaxial structure parameters of a laser; determining a target area which begins to perform downward annular etching on the surface of the p-DBR layer, wherein the target area coincides with a light field intensity peak area of the high-order transverse mode; performing annular etching in the target area to form an annular groove, and etching at least seven pairs of p-DBR layers inwards in the groove; the communication system comprises a signal transmitting end arranged on the derrick side, and the signal transmitting end is provided with the vertical cavity surface emitting laser; the p-DBR region of the vertical cavity surface emitting laser is provided with an annular etching structure; the graded-index fluorinated plastic optical fiber is used as a transmission medium and is connected with the derrick side and the logging room side; and the optical signal receiving end is arranged at the logging room side and is used for receiving and converting the optical signal into an electric signal.

The embodiment of the invention discloses a signal transmission method, a communication system and a photoelectric conversion module, the photoelectric conversion module and equipment jointly compensate an electric signal transmitted by a transmitting link, intersymbol interference is effectively suppressed, the signal quality of an optical signal is improved, and the bit error rate of the optical signal is reduced. The method comprises the following steps: firstly, the equipment or the photoelectric conversion module distributes a first compensation parameter to the photoelectric conversion module, and the first compensation parameter is smaller than a link parameter of a transmitting link; the device then compensates the first electrical signal according to a second compensation parameter to obtain a compensated second electrical signal. The device then sends a second electrical signal to the photoelectric conversion module. The photoelectric conversion module compensates the second electric signal according to the first compensation parameter to obtain a compensated third electric signal. And finally, the photoelectric conversion module performs electro-optical conversion on the third electric signal to obtain an optical signal, and the photoelectric conversion module emits the optical signal.

A visible-light communication and illumination array includes a substrate and plural surface-emitting superluminescent diodes, SLDs, distributed across the substrate. A first set of SLDs of the plural SLDs generates a first light beam having substantially a first wavelength, a second set of SLDs of the plural SLDs generates a second light beam having substantially a second wavelength, and a third set of SLDs of the plural SLDs generates a third light beam having substantially a third wavelength. The array further includes a controller configured to encode at least one of the first light beam, the second light beam and the third light beam to transmit information. A combination of the first light beam, the second light beam and the third light beam produces white light.

Systems and methods are described for transmitting information optically. For instance, a system may include an optical source configured to generate a beam of light. The system may include at least one modulator configured to encode data on the beam of light to produce an encoded beam of light / encoded plurality of pulses. The system may include a spectrally-equalizing amplifier configured to receive the encoded beam of light / encoded plurality of pulses from the at least one modulator and both amplify and filter the encoded beam of light / encoded plurality of pulses to produce a filtered beam of light / filtered plurality of pulses, thereby spectrally equalizing a gain applied to the encoded beam of light. In some cases, the system may slice the beam of slight, to ensure a detector has impulsive detection. In some cases, the system may include a temperature controller to shift a distribution curve of wavelengths of the optical source.

The invention discloses an optical fiber signal transmission system and method based on quantum noise encryption, and relates to the technical field of optical fiber communication, and the system comprises a composite modulation transmitting module, a dispersion compensation relay module, a coherent receiving module and a digital signal processor. The composite modulation transmitting module comprises an electro-optical modulator and a quantum noise randomization encoder; the dispersion compensation relay module comprises an adjustable dispersion compensator and a Raman amplifier; the coherent receiving module comprises a local oscillator laser and a 90-degree optical mixer; a digital signal processor includes a clock recovery unit and a maximum likelihood sequence detector. All the modules are sequentially connected and cooperatively work. And the adjustable dispersion compensator dynamically applies reverse dispersion compensation calculated based on a dispersion coefficient and a transmission distance according to the dispersion amount monitored in real time. According to the invention, through technologies of quantum noise encryption, dynamic dispersion compensation, Raman amplification, coherent reception and the like, safe and efficient transmission with single-wave 400Gbps and 100km transmission bit error rate less than or equal to 1 * 10 <-12 > is realized.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

A control device which controls an operation of a compensation device which compensates for birefringence and / or polarization mode dispersion, which is received by signal light having propagated through an optical transmission line, by digital signal processing using a finite impulse response filter includes: a detection signal reception unit which receives a detection signal which is a signal indicating a detection result of a detection device which optically detects polarization fluctuation in the optical transmission line; and a setting unit which decides a setting regarding an update frequency or an update interval of the number of taps of the finite impulse response filter or an update frequency or an update interval of a tap coefficient of the finite impulse response filter, based on the detection result of the detection device.

An optical module configured to electrically connect to a host. A linear equalizer performs equalization on a host equalized signal to create a module equalized signal, and a driver configured to present the module equalized signal from the linear equalizer to an optical conversion device at a magnitude suitable for the optical conversion device. An optical conversion device receives the module equalized signal from the driver, converts the module equalized signal to an optical signal, and transmit the optical signal over an optical channel. Also part of the optical module is an interface which communicates supplemental equalizer settings to the host. A memory stores the supplemental equalizer settings which reflect the optical modules effect on a signal passing through the optical module. A controller oversees communication of the supplemental equalizer settings to the host such that the host uses the supplemental equalizer settings to modify host equalizer settings.

The invention relates to the technical field of automobile lamp communication, in particular to an automobile headlamp free optical communication system and method based on stroboscopic modulation. The vehicle-mounted computer receives road condition information and converts the road condition information into an original bit stream, the anti-interference encoder generates an intermediate signal with a check code, the time-frequency interleaver carries out interleaving, the driving circuit modulates the interleaved intermediate signal, and the vehicle lamp receives the modulated signal and sends out an optical signal in a stroboscopic mode; a photoelectric sensor at a receiving end captures an optical signal emitted by a vehicle lamp, a noise reduction filtering module carries out wavelet noise reduction and filtering processing, a judgment decoding module carries out frame positioning, demodulation and verification on the processed optical signal to generate a restoration bit stream, and a vehicle-mounted computer restores the restoration bit stream into road condition information. And the voice broadcast module carries out voice broadcast on the road condition information. According to the invention, stable communication requirements between vehicles and between the vehicle and the sensing equipment in a closed or semi-closed environment in which electromagnetic signals are seriously disturbed can be met.

The invention discloses a method, a system and related equipment. The controller can determine a first optical channel in a first time slot between an optical sending device and an optical receiving device according to a data transmission request, and then sends configuration information to the optical sending device to instruct the optical sending device to send first data to the optical receiving device in the first time slot according to a phase compensation coefficient of the first optical channel, the phase error introduced by the first optical channel is compensated, the data recovery accuracy of the optical receiving equipment is improved, and the error rate is reduced.

The invention discloses a double-fiber bidirectional asymmetric optical fiber time service method and device, and relates to the technical field of time synchronization, two optical signals with different wavelengths are modulated and sent at the same time through master station equipment / slave station equipment, the two optical signals with different wavelengths are combined to obtain a single-path optical signal, and then the single-path optical signal is transmitted through an optical fiber. The slave station device / master station device carries out wave division processing on the received single-path optical signal to obtain two optical signals with different wavelengths, and the dispersion and the wavelength of the two optical signals with different wavelengths and the time of reaching the slave station device / master station device are obtained to assist the slave station device / master station device to carry out high-precision time delay compensation amount calculation; therefore, the precision of dispersion delay measurement is improved, and finally high-precision double-fiber bidirectional asymmetric optical fiber time service is realized.

The invention discloses a multipath interference noise suppression method and device and a storage medium. The method comprises the following steps: determining a target sampling signal according to an analog signal; filtering recovery operation is carried out on the target sampling signal to obtain an original sampling signal, and the original sampling signal is the original form of the target sampling signal; eliminating the level shift of the original sampling signal through the adaptive offset to obtain a first sampling signal; demodulating the first sampling signal to obtain and output binary data corresponding to the first sampling signal; the MPI noise suppression is realized by introducing an adaptive offset which can be updated, and the signal quality and the signal transmission performance are improved; and the adaptive offset is updated in real time according to the second sampling signal and the preset updating step length, so that the stability and robustness of noise suppression in different environments are ensured, and the system can keep high-performance operation in a complex and variable practical application scene.

The embodiment of the invention provides an ROF photodiode, a manufacturing method thereof and an optical receiver, and belongs to the technical field of photoelectric detection. The ROF photodiode comprises: a wafer substrate; the intrinsic absorption layer is arranged on the upper surface of the wafer substrate; the light-transmitting flat layer is arranged outside the intrinsic absorption layer in a covering manner, and one surface of the light-transmitting flat layer, which is used for receiving the Gaussian light emitted into the ROF photodiode by the optical fiber, is provided with a flat surface; the micro lens is arranged on the flat surface of the light-transmitting flat layer, and the center of the micro lens is aligned with the center of Gaussian light emitted by the optical fiber; gaussian light emitted by the optical fiber is converged after passing through the micro lens, and after the converged Gaussian light passes through the light-transmitting flat layer, the power density peak value is dispersed and weakened, and the converged Gaussian light is converted into flat-topped light to be emitted into the intrinsic absorption layer. According to the ROF photodiode, Gaussian light emitted by the optical fiber is dispersed, weakened and converted into flat-topped light, the electric field suppression effect caused by light power peak value concentration is avoided, the good bandwidth characteristic is guaranteed, and the light response performance is improved.

The invention discloses a wavefront distortion correction method based on a dynamic adaptive MESSA algorithm and a coherent free space optical communication system. The problems that an existing method is prone to falling into a local optimal solution, the correction effect is poor under dynamic turbulence, and the adaptive capacity is weak are solved. According to the method, an individual position is initialized through a Circle chaotic mapping method, iterative optimization is carried out in combination with a Levy flight strategy and a variable spiral search strategy, and a step size control parameter, a safety threshold, spiral strength and a spiral adjustment coefficient are dynamically adjusted through a double-discrimination dynamic adaptive parameter adjustor. And reducing the population scale according to a nonlinear population reduction strategy, finally outputting an optimal individual position, and driving the deformable mirror to perform wavefront correction according to a control voltage vector corresponding to the optimal individual position. According to the invention, the dynamic adjustment of the algorithm parameters and the population structure is realized, and the adaptability, convergence speed and stability of the wavefront distortion correction method in the dynamic turbulence environment are enhanced.

The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device and method. The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device which comprises a central station, a transmission medium and a far-end base station. Wherein the central station comprises a first wavelength tunable laser (1), a local oscillator signal generator (2), a second wavelength tunable laser (3), a first double-parallel Mach-Zehnder modulator (4), an electric power divider (5), a second double-parallel Mach-Zehnder modulator (6), a 90-degree polarization rotator (7) and a polarization beam combiner (8). And a transmission medium adopts a single-mode optical fiber (9). The far-end base station comprises an optical power amplifier (10), a polarization beam splitter (11), a first photoelectric detector (12), a second photoelectric detector (13), an electric power amplifier (14), a transmitting antenna (15) and a receiving antenna (16). The invention further provides an optical up-conversion, optical fiber transmission and self-interference elimination method. According to the invention, the influence of the up-conversion transmission signal on the signal received by the far-end base station can be eliminated, the transmission quality of the received signal is improved, and the base station is simplified.

The present specification discloses a dispersion compensation apparatus and a dispersion compensation method. The dispersion compensation device comprises at least a first compensation element and a second compensation element, each compensation element comprising a refractive interface and a reflective interface. The to-be-compensated light beam is propagated between the compensation elements in a normal incidence / normal emergence propagation form based on the refraction interface, and the propagation direction and the incidence and emergence positions of the to-be-compensated light beam in the compensation elements are changed based on the reflection interface; the to-be-compensated light beam is reflected between the first compensation element and the second compensation element for at least two rounds and then is emitted from the at least two compensation elements. In the dispersion compensation equipment provided by the specification, a light beam to be compensated is spread among compensation elements in a normal incidence / normal emergence mode under the non-dispersive condition, and is reflected for multiple rounds through a first compensation element and a second compensation element which are arranged in a relatively staggered manner; on the basis of a simple optical structure, high-limit dispersion compensation is realized.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

According to examples, a test instrument may determine equalization setting values for electrical signals communicated with optical modules. Particularly, the test instrument may automatically determine the equalization setting values that may result in an optimal signal quality metric of electrical signals communicated with an optical module. The test instrument may generate test signals having a plurality of equalization setting value permutations applied to the test signals and may determine respective signal quality metrics of the test signals returned from the optical module. In other examples, the optical module may generate the test signals and the optical module or the test instrument may determine the respective signal quality metrics of the test signals. In either of these examples, the values of the equalization settings may be set to be applied on electrical signals communicated with the optical module to improve a quality of the electrical signal communications with the optical module.

The disclosed methods include recording pulse data indicating laser pulse(s) transmitted into or out of one or more fibers within a fiber cable to generate a first fiber record. The method determines whether at least one of the one or more fibers is spliced following which a trace in the first fiber record corresponding to a splicing point within the fiber cable is identified. The fiber record may be split into an inbound section and an outbound section such that an outbound trace numbering of the outbound section is mirrored to align with a trace numbering of the inbound section to generate mirrored data. Geometry data may be assigned to the mirrored data to generate a geometrically formatted fiber record. Signal components within the geometrically formatted fiber record may be reconstructed and used in a combination process to generate a report indicating captured measurements along the fiber cable.

The invention discloses a modulation identification method based on microwave photon frequency-time mapping. The method comprises the following steps: firstly, performing microwave photon frequency-time mapping on a to-be-measured microwave signal, and mapping frequency information of the to-be-measured microwave signal to a time domain to obtain a time-frequency characteristic of the to-be-measured microwave signal; and inputting the time-frequency characteristics of the to-be-detected microwave signal into a pre-trained neural network model so as to identify the modulation form of the to-be-detected microwave signal. The invention also discloses a modulation identification device based on microwave photon frequency-time mapping. Compared with the prior art, on the basis of a microwave photon frequency-time mapping model, Fourier transform is directly completed through an optical device, a radio frequency signal is modulated to be processed in an optical domain, time delay characteristics of dispersion broadening and compression are combined, the picosecond-level time stretching precision is achieved, the instantaneous bandwidth limitation of a traditional spectrum analyzer is broken through, and the spectrum analysis precision is improved. Frequency spectrum processing of large-bandwidth signals can be completed in real time, computing resources are saved, and the real-time performance of modulation identification is improved.

The invention provides a transmitting-receiving axis deviation compensation method based on transmitting optical axis nutation scanning, and the method comprises the steps: carrying out the parameter pre-configuration of a space laser communication system through simulation, then initializing a variable, entering a nutation cycle, collecting the optical power data of a plurality of sampling points through a receiving end, and carrying out the nutation scanning according to the collected optical power data through a gradient acceleration nutation algorithm, calculating an optical power gradient and an optimal direction, adaptively adjusting a nutation step length, updating a pointing coordinate according to the adjusted nutation step length, judging whether convergence is carried out or a preset maximum period number is reached, and outputting a result after circulation is finished. Under the same precision, the number of iterations is reduced by about 50%-60% compared with a traditional nutation algorithm, additional data acquisition is not added, equipment such as a pyramid does not need to be additionally prepared, hardware overhead is saved, and parameter robustness is high.

The invention discloses a power data network wide area synchronous transmission system based on APN6 intelligent slicing, and relates to the technical field of power system communication, the service type of current transmission data is obtained through an identification embedding module, and a structured APN6 identifier is embedded in a Hop-by-Hop option header of an IPv6 extension header; the slice creation module judges whether retransmission is carried out or not according to CRC verification, dynamically creates multi-level slices according to time delay levels, and calculates an optical fiber refraction compensation value according to topological path coding; when the phase compensation module monitors that a line fault or a node is overloaded, different strategies are executed for slices of different levels, and transmission phases of slices around a fault area are adjusted through the signal modulation module; and when the slice capacity expansion module detects that the new energy cluster oscillates, bandwidth directional capacity expansion is executed according to the slice resource elastic scheduling framework. According to the method and the device, the data identification accuracy and the slice resource adaptability are improved.

An optical device includes a transition unit in which a first waveguide and a second waveguide are disposed in an overlapped manner such that a magnitude relationship of an effective refractive index between the vertical modes propagating the first waveguide and the vertical modes propagating the second waveguide is inverted at the positions of input and output. The transition unit allows, at the input, the second waveguide to be a single mode waveguide and allows, at the output, the second waveguide to be a multi-mode waveguide through which TM0 light in the maximum vertical mode and light in a higher-order mode propagate. The optical device includes a removing unit that allows the second waveguide to be a single mode waveguide through which the TM0 light propagates by removing the light in the higher-order mode from the light received from the transition unit.