93 results about "Intensity modulator" patented technology

The invention discloses an optical computing array based on micro-ring resonators without a free spectral range, which comprises an on-chip wavelength division multiplexing beam splitting array, an on-chip intensity modulation array, two groups of on-chip wavelength division multiplexing beam combining arrays and an on-chip balance detector, the on-chip wavelength division multiplexing beam splitting array and the on-chip wavelength division multiplexing beam combining array are respectively composed of a group of multiple FSR-free MRRs which share the same bus optical waveguide, each resonator corresponds to an independent wavelength channel, and the on-chip intensity modulator array is composed of a plurality of groups of on-chip MZI modulator arrays. According to the optical calculation array implementation method, independent control and coding calculation of different wavelength channels in a broadband wavelength range are realized by utilizing the single harmonic peak characteristic of the FSR-free MRR array and the wide-spectrum intensity modulation function of the MZI unit, the limitation of a free spectrum range on the optical calculation wavelength channel is eliminated, the higher wavelength parallelism is achieved, and the optical calculation array implementation method has the advantages of being simple in structure and convenient to implement. And therefore, the calculation scale is remarkably improved.

The invention discloses an optical fiber laser phased array self-adaptive optical system based on an integrated optical chip. The optical fiber laser phased array self-adaptive optical system comprises a self-adaptive optical fiber coupler array, the integrated optical chip, an optical fiber splitter, a photoelectric detector, a control platform and a high-voltage amplifier. The integrated optical chip comprises an optical fiber coupling interface, a waveguide, a phase shifter, a Mach-Zehnder intensity modulator and the like. The adaptive optical fiber coupler array couples incident light to the optical fiber array, and corrects tilt aberration based on an optimization control algorithm to realize efficient adaptive coupling of spatial light to optical fibers; the sub-beams enter an integrated optical chip through an optical fiber coupling interface, phase and intensity modulation is performed on the sub-beams in the optical chip based on an optimization control algorithm, and co-phase synthesis output of the beams is realized; the output light is divided into two paths by the optical fiber splitter, one path is connected with the photoelectric detector for control, and the other path is connected with the application end. Based on light path reciprocity, the system has a transmitting or receiving and transmitting integrated function, and has important application prospects in the fields of space optical communication, laser energy transfer and the like.

The invention discloses a device and a method for testing frequency domain characteristics of a high-speed optoelectronic device. The device comprises a laser, a sawtooth wave generator, a signal source, an acousto-optic modulator, an electro-optic intensity modulator, a low-frequency photoelectric detector, a frequency spectrograph and a computer. An electro-optic intensity modulator is driven through a sawtooth wave modulation technology, and frequency-shifted and non-frequency-shifted optical carriers and frequency-shifted and non-frequency-shifted radio frequency optical sidebands are synchronously generated in an optical path in combination with radio frequency signal modulation. And after the signal is subjected to beat frequency processing by the photoelectric detector, the power of the frequency shift signal in different working states is measured by the frequency spectrograph, so that the frequency domain characteristic parameters of the photoelectric device to be measured are obtained. The method is based on sawtooth wave modulation and an amplitude comparison method, frequency domain response characteristics of a single / dual-drive electro-optic intensity modulator, dual-parallel electro-optic intensity modulation and a photoelectric detector can be accurately represented, the test method is simple, and dependence on a high-frequency test instrument is effectively reduced.

The invention discloses a phase coding optoelectronic oscillator with an adjustable duty ratio and an implementation method thereof, and relates to the technical field of photoelectricity. The optoelectronic oscillator comprises a laser, a Mach-Zehnder modulator, a single-mode fiber, a photoelectric detector, an electric amplifier, an electric band-pass filter and an electric power divider which are connected in sequence; a direct current port of the intensity modulator is connected with the function generator, one path of the electric power divider serves as output, and the other path is connected with a radio frequency port of the intensity modulator; the output voltage of the preset function generator jumps between the two linear bias points and the minimum bias point of the Mach-Zehnder modulator, so that the direct output of the phase-coded microwave signal with the adjustable duty ratio is realized. According to the invention, the coherence of the phase coding microwave signal is good, the phase noise is low, the duty ratio is adjustable, the coding flexibility is high, the structure is simple, and the equipment cost is low.

The invention relates to the field of signal frequency detection in microwave photonics, and discloses a broadband instantaneous frequency measurement receiving system based on Brillouin spectrum compression, which utilizes a dual-tone pump optical carrier signal carried on an intensity modulator and an optical filter to generate a single Brillouin pump source regulated and controlled by unknown radio frequency. A stimulated Brillouin structure narrowed by an optical fiber ring cavity and a single-pumping reference source subjected to phase shift beat frequency, a signal in a 45GHz range can be compressed to a bandwidth of 2.5 MHz, and meanwhile, an original signal can be subjected to optical domain down-conversion processing by a reference source signal, so that a low-frequency signal easy to process electronically is obtained; besides, a double-fiber annular cavity design is adopted, the line width of the Brillouin resonant laser is further compressed through mode matching of interference of light waves in the cavity, test precision reduction caused by frequency spectrum compression is made up, the resolution ratio can reach + / -2.2 MHz, and finally the Brillouin broadband instantaneous frequency measurement receiving technology is achieved.

The application discloses a microwave photon filter and a control method thereof, and belongs to the field of optical fiber communication. The filter comprises an optical ring cavity, a tunable laser source, an electro-optic intensity modulator, a photoelectric detector and an electric vector network analyzer. The first input end of the electro-optic intensity modulator is connected with the output end of the tunable laser source, the second input port of the electro-optic intensity modulator is connected with the output end of the electric vector network analyzer, and the output end of the electro-optic intensity modulator is connected with the input end of an optical circulator in the optical ring cavity. The output end of the optical circulator in the optical ring cavity is connected with the input end of the photoelectric detector, and the output end of the photoelectric detector is connected with the input end of the electric vector network analyzer. The application can overcome the problem that the device parameters cannot be adjusted after the structure of the microwave photon filter is determined.

The application discloses an optical multiplier system for processing high-speed data flow and a method thereof, and belongs to the technical field of semiconductors, comprising a stibonium quantum well laser, an intensity modulator, a phase modulator, a balanced homodyne detector and an oscilloscope; the stibonium quantum well laser is used as a light source, light signals output by the stibonium quantum well laser are evenly divided into two light beams by a Y-type beam splitter, and the two light beams are defined as x-vector light beams and y-vector light beams respectively; the two light beams sequentially pass through the intensity modulator and the phase modulator to complete real number and complex number coding; after the two light beams are coupled by a beam splitter / coupler, the two light beams are input to the balanced homodyne detector for detection, and the photocurrent output by the balanced homodyne detector is calculated to obtain a differential current, the differential current is collected and displayed in real time by the oscilloscope, and the differential current is the vector point multiplication operation result corresponding to the two vector light beams. The application has the characteristics of low cost, low energy consumption, high speed, expandability and the like.

This invention relates to the fields of optical fiber communication and microwave photonics. Existing tunable dual-passband microwave photonic filters suffer from poor passband stability and cannot meet practical application requirements. This invention provides a narrow-band tunable dual-passband microwave photonic filter using a Brillouin fiber laser. It generates dual-tone pump light to excite the Brillouin using a tunable laser source and an intensity modulator. Combined with a Brillouin fiber oscillator and a cascaded Fabry-Perot cavity, the Brillouin gain spectrum is narrowed to the kHz level. Simultaneously, the different periodic resonant frequencies of the two ring cavities effectively suppress side modes, filtering out the desired frequency band signal. Furthermore, by synchronously tuning the center frequencies of the two passbands of the filter by changing the pump light wavelength, and simultaneously controlling the output frequency of the signal generator, the frequency interval between the two passbands is changed, ultimately realizing a narrow-linewidth tunable dual-passband microwave photonic filter.

The application discloses a Fourier domain mode locked laser based on a laser dynamic establishment process and a control method, and comprises a ring laser cavity which is composed of an optical amplifier, a first isolator, a second isolator, an adjustable filter, a delay optical fiber, a coupler and a polarization controller or an optical amplifier, a first isolator, a second isolator, an adjustable filter, a delay optical fiber, a coupler, an intensity modulator and a polarization controller. When the dispersion amount in the ring laser cavity exceeds the bandwidth range of the adjustable filter, the optical amplifier or the intensity modulator is controlled to restart, so that the laser signal is restarted instead of the signal in the continuous gain cavity, the residual dispersion in the cavity is resisted, high coherent swept laser output is realized, any dispersion compensation technology is not needed, the scheme is simple, the requirements of the devices used for the laser are low, environment control technology is not needed, the scheme has strong robustness, the cost is reduced, and the Fourier domain mode locked laser can be applied to any waveband.

The invention provides an optical time-frequency analysis method based on a tunable optical filter, and relates to the technical field of optical fiber communication time-frequency analysis, and the method comprises the steps: transmitting an optical carrier wave through a time lens generation unit, modulating the optical carrier wave, and obtaining a chirp optical carrier wave as a time lens; the wavelength of the optical carrier is adjusted, so that the focal length of the time lens is equal to the equivalent dispersion value of the tunable optical filter, and the period of the time lens is equal to the reciprocal of the full width at half maximum of the tunable optical filter; an original input signal is modulated to a time lens by using an electro-optical intensity modulator to obtain a chirp optical signal; processing the chirp optical signal by using a tunable optical filter; under the combined action of the tunable optical filter and the time lens, completing frequency-time mapping processing on an original input signal to obtain an optical signal after frequency-time mapping; and finally, the optical signal is converted into an electric signal, and then the electric signal is converted into frequency spectrum information which can be observed in real time. According to the invention, the real-time performance and compatibility of spectrum analysis of non-stationary signals can be improved.

The application discloses a kind of intensity modulation polarization encoding quantum key distribution systems based on sagnac ring, including communication end Bob and communication end Alice, the communication end Bob and communication end Alice are connected by optical fiber channel;The laser in the communication end Bob generates optical signal into optical isolator and exports linearly polarized signal parallel to cat eye direction into first polarization maintaining beam splitter;First polarization maintaining beam splitter exports linearly polarized signal parallel to cat eye direction into communication end Alice;Communication end Alice divides the linearly polarized signal parallel to cat eye direction into first linearly polarized signal and second linearly polarized signal with equal intensity and carries out intensity modulation, and finally polarized state signal is output into communication end Bob by the beam combination superposition of third polarization beam splitter after being combined, first single-photon detector to fourth single-photon detector in communication end Bob carries out measurement.The polarization encoding and quantum state modulation of signal are realized by one intensity modulator in the application, and the equipment cost of QKD is reduced.

Provided is an integrated beam steering device. The steering device includes a substrate, a core layer provided on the substrate, a clad layer on the core layer, a plurality of upper electrodes provided on the clad layer, and a lower electrode provided on a lower surface of the substrate. Here, the substrate includes a source region configured to generate laser beam, a distribution region configured to transmit the laser beam, an amplification region configured to amplify the laser beam, a phase modulation region configured to modulate the phase of the laser beam, and a first intensity modulation region configured to modulate the intensity of the laser beam.

The utility model discloses a nine-path output transimpedance amplification photoelectric detector based on a 3 * 3 PIN matrix photodiode, and the photoelectric detector comprises a light current signal collection module which is used for receiving laser of a specific wave band modulated by an intensity modulator, and comprises the 3 * 3 PIN matrix photodiode; the power input and filter circuit module is used for providing stable power supply voltage for the photoelectric detector; the operational amplifier voltage power supply module is used for ensuring the stability of the output voltage and comprises an operational amplifier positive voltage power supply module and an operational amplifier negative voltage power supply module; the reverse adjustable bias module is used for providing adjustable negative power supply voltage for the matrix photodiode; the transimpedance amplification module is used for effectively reducing noise and errors caused by input current and ensuring rapid rising and falling of an output signal; the voltage amplification module is used for reducing noise interference and improving signal quality and precision; and the signal output module is used for outputting the electric signal.

This invention relates to a multi-frequency fusion I-TOF ranging method and system, belonging to the field of laser ranging. The optical signal output from the light source is modulated by an intensity modulator and split into two paths: a measurement light and a reference light. The modulation signal is composed of n (n>2) sinusoidal signals of different frequencies with specific relationships superimposed. After the measurement light is emitted, it is reflected by the target object. The reference light and the return light from the measurement path are received by photodetectors and processed into digital signals by circuitry. The phase difference between the multi-frequency signals in the reference light and the return light is extracted to obtain the ranging results of the multi-frequency signals. Finally, an algorithm is used to fuse them to obtain an accurate ranging result. This invention, by reasonably selecting the frequencies of multiple modulation signals and combining them with a fusion algorithm, can achieve a large range, high precision, and high robustness in distance measurement.

The invention discloses a signal modulation device, a signal modulation method, an optical transmitter and an optical communication system, and relates to the technical field of optical communication, the signal modulation device comprises an intensity modulator and a phase modulator, the intensity modulator is used for carrying out intensity modulation on an optical carrier wave emitted by a light source according to a PAM electric signal output by an electric signal driver, and outputting a first PAM optical signal; the phase modulator is connected with the intensity modulator, and the phase modulator is used for carrying out phase modulation on the first PAM optical signal output by the intensity modulator according to the square wave electric signal output by the electric signal driver and outputting a second PAM optical signal with positive and negative alternating amplitudes. According to the invention, primary phase modulation is added, the PAM optical signal after intensity modulation is subjected to carrier component removal processing through secondary modulation, the PAM optical signal without the carrier component is output, the PAM optical signal is large in effective signal proportion, strong in anti-noise performance and good in signal quality in the transmission process, and the overall performance of an optical communication system can be improved.

A sensing system. The sensing system may include a transmitter to launch an outbound optical signal, a clock to generate a clock signal, and a chirp subcarrier coupled to the clock and configured to generate a chirp. The sensing system may further include a code generator coupled to the clock and configured to generate a code; and an intensity modulator, arranged to modulate the outbound optical signal and coupled to receive an intensity modulator signal that is derived at least in part from the code generator.

The invention discloses a quantum light source based on waveguide type periodically poled lithium niobate, which comprises a laser source, an intensity modulator, a periodically poled lithium niobate (PPLN) optical waveguide device, a first phase modulator, a second phase modulator and a control driving unit which are integrated in a single module, internal optical path connection of all the optical devices is achieved through polarization maintaining optical fibers. The intensity modulator is used for modulating the pump light output by the laser source; the PPLN optical waveguide device converts the pump light into entangled photon pairs; the first phase modulator and the second phase modulator carry out independent phase modulation on the signal photons and the idler frequency photons; and the control driving unit is used for carrying out system-level cooperative closed-loop control on all devices. Through system-level integration innovation, an all-fiber, multifunctional, dynamically adjustable and high-stability quantum light source is realized, and the practicability and usability of a quantum system are greatly improved.

This application discloses an optical domain decoupling amplitude-frequency response equalization optimization method and apparatus. First, a system-level calibration is performed on the optoelectronic link, which includes an arbitrary waveform generator, intensity modulator, photodetector, and oscilloscope, to obtain the overall frequency response of the link, including amplitude and phase frequency responses. Then, the transmitter amplitude-frequency response is obtained through optical domain scanning and normalization. The receiver amplitude-frequency response is separated from the overall amplitude-frequency response through decoupling operations. Finally, a transmit-receive domain equalization strategy is used to complete transmit signal pre-distortion compensation and receive signal de-embedding compensation, respectively. This successfully achieves a balance between testing cost, testing time, and equalization performance, realizing low-cost, high-efficiency, and high-performance frequency response decoupling and equalization compensation for IMDD high-speed optical links. It provides an efficient, economical, and high-performance solution for the research and testing of IMDD high-speed optical modules.

This invention relates to a monolithically integrated wide and narrow passband reconfigurable electro-optic modulator, belonging to the field of electro-optic modulators. It includes a substrate, and integrated on the substrate are a tunable optical splitter, a dual-output intensity modulator, a phase modulator, a tunable optical attenuator, a first optical combiner, and a second optical combiner. The input terminal of the tunable optical splitter receives an input optical signal, and its output terminals are connected to the input terminals of the dual-output intensity modulator and the phase modulator, respectively. The first output terminal of the dual-output intensity modulator is connected to the input terminal of the second optical combiner, and the second output terminal is connected to the input terminal of the tunable optical attenuator. The output terminals of the phase modulator and the tunable optical attenuator are both connected to the input terminal of the first optical combiner, and the output terminal of the first optical combiner is connected to the input terminal of the second optical combiner. The output terminal of the second optical combiner outputs a modulated optical signal.

The invention relates to a low-stray high-conversion-efficiency film lithium niobate frequency mixing chip and a frequency mixing system, and belongs to the technical field of microwave photons. The frequency mixing chip comprises two directional couplers, two intensity modulators and two micro-rings, an external optical carrier signal is received, the external optical carrier signal, an externally loaded radio frequency signal and a local oscillator signal are subjected to shunt modulation, and finally, an optical signal is combined and output. According to the invention, the lithium niobate thin film is adopted, so that the DC-67 GHz wide-frequency-band working capability is ensured; the invention discloses a frequency mixing design method based on a tunable micro-ring and a power division ratio tunable directional coupler. An intensity modulator is biased at a minimum point and is combined with a high-suppression-ratio micro-ring, so that the low stray capacity of a frequency mixing chip is ensured; the power division ratio tunable directional coupler is adopted to control the input power splitting ratio of the two intensity modulators, and the conversion efficiency of the frequency mixing chip is improved by optimizing the splitting ratio.

The invention belongs to the technical field of photoelectricity, and particularly relates to a broadband frequency doubling device based on a harmonic injection locking optoelectronic oscillator and an implementation method. According to the invention, + / -1-order optical sidebands are generated by using a carrier suppression double-sideband modulation mode of the electro-optical intensity modulator, and initial second-order harmonic injection signals are generated after beat frequency of the photoelectric detector. And when the frequency of the injection signal is aligned with the oscillation mode in the ring cavity of the photoelectric oscillator, the frequency of the oscillation mode output by the photoelectric oscillator is locked at the frequency of the injection signal, and finally, the output of the frequency doubling signal with optimized phase noise is realized.

The application relates to a quantum key distribution decoder, a decoding method and a chip, the quantum key distribution decoder comprising a high-speed intensity modulator and an interferometer, wherein: the high-speed intensity modulator is used for receiving optical signal pulses and has a pulse output port, the high-speed intensity modulator is used for regulating the received optical signal pulses to one arm of the interferometer through the regulation of the pulse output port; and the interferometer is used for carrying out interference decoding on the optical signal pulses regulated by the high-speed intensity modulator. According to the quantum key distribution decoding scheme provided by the application, by adding a high-speed intensity modulator in front of a traditional interferometer, the front and rear pulse time sequences are interfered by regulating the pulse output port, each optical signal pulse is not divided into two parts, the intrinsic 3dB loss is avoided, and the system code rate is improved.

The utility model discloses a laser radar based on a coaxial receiving and transmitting light path, and aims to solve the problem of poor distance measurement precision of the existing laser radar. The device comprises a Newton type reflecting telescope, a coaxial receiving and emitting light path and a hardware correlator, a first reflecting mirror, a shaping beam expander and a pulse laser are sequentially arranged on one side of a lens cone in the axial direction, and a second reflecting mirror, an optical fiber coupler, a fast light intensity modulator and a photon detector are sequentially arranged on the other side of the lens cone in the axial direction; based on the Newton type reflection telescope and the fast light intensity modulator and through cooperation of the duplex auxiliary mirror, the first reflector and the second reflector, the distance measurement device has the advantages of being high in distance measurement precision, high in spatial resolution, insensitive to stray light, simple in data processing and the like, and powerful support is provided for related research of weather detection and distance detection; a coaxial design is adopted, and the transmitting unit and the receiving unit are integrated together, so that an overlapping factor can be improved to the maximum, and a higher light beam utilization rate and higher detection efficiency are achieved.

The application discloses a photoelectric response measurement method of a photoelectric detector, belongs to the field of optoelectronic technology, and aims to provide a wideband and low-cost method for measuring the frequency response of a photoelectric detector.In the application, the light signals output by a laser are modulated by signals output by a first signal source and a second signal source in an electro-optic intensity modulator; a control and data processing module is used to control the frequency of the signals output by the first signal source to be fixed and to change the frequency of the signals output by the second signal source, the modulated light signals are input into a photoelectric detector to be measured, a signal analysis module is used to analyze the frequency components output by the photoelectric detector to be measured, the frequency response of the electro-optic intensity modulator is extracted and eliminated, and finally the measurement of the photoelectric response of the photoelectric detector to be measured is realized.

Embodiments of the present disclosure provide methods and apparatus for converting an optical signal into an electrical signal The method comprises receiving the optical signal, splitting the optical signal into a first signal and a second signal, measuring intensity information of the first signal, processing the first signal using an intensity modulator to generate an inverse intensity waveform, combining the inverse intensity waveform and the second signal to generate a constant intensity waveform, converting the constant intensity waveform into a digital constant intensity signal using an Analog-to-Digital Converter (ADC), combining the intensity information and the digital constant intensity signal, and generating the electrical signal using a Digital Signal Processor (DSP).

The invention discloses a management device for a quantum key distribution (QKD) system and a quantum communication system, and relates to the technical field of quantum communication, the management device for the QKD system comprises a light intensity management module and a spectrum management module, the light intensity management module at least comprises a first light intensity manager and a second light intensity manager, and the spectrum management module comprises a spectrum management module. The first light intensity manager comprises a first optical switch, a first optical fiber interferometer, a first variable optical attenuator, a first intensity modulator and a first light beam combiner, and the second light intensity manager comprises a second optical switch, a second optical fiber interferometer, a second variable optical attenuator, a second intensity modulator and a second light beam combiner. The first light intensity manager is respectively connected with the transmitting end of the QKD system and the spectrum management module, and the second light intensity manager is respectively connected with the transmitting end of the QKD system and the spectrum management module; and the spectrum management module comprises a dispersion compensation module, a filter and a plurality of wavelength division multiplexers, so that the complexity of light path construction is reduced, and integration is facilitated.

An optical beam intensity modulator 100 comprises a modulator element 106 arranged to transmit an optical beam along a first path (120, Fig. 1) in a first modulator state as a first beam and along a s

The present application discloses a quantum state encoding device and method without a long delay line. The device and method use a random minute radio frequency signal to modulate a laser to achieve phase difference adjustment between pulse pairs, while simultaneously employing chopping to achieve a constant phase difference between two laser pulses of a pulse pair. Thus, without the aid of a long delay line interferometer or multiple lasers used for injection locking, the requirements for phase randomization between pulse pairs and a constant or specific phase difference between the two laser pulses in each pulse pair can be simultaneously satisfied. In addition, the present application can be implemented by means of conventional lasers, intensity modulators, and phase modulators, facilitating chip integration and achieving high yield and good stability.

This invention discloses a method for generating broadband microwave signals based on microwave photonics technology. A reference microwave signal and an excitation microwave signal are simultaneously passed through a 90° microwave bridge to obtain two orthogonal microwave signals. These two orthogonal microwave signals are then used to perform carrier-suppressed single-sideband modulation on an optical carrier using a dual parallel intensity modulator. The generated modulated optical signal is then optically amplified and filtered before photoelectric conversion to generate a frequency-converted microwave signal. This frequency-converted microwave signal is split into two paths: one is used as the system output, and the other is electrically amplified and filtered before being fed back to the 90° microwave bridge, thus forming a closed frequency conversion loop. After multiple frequency conversions, the system outputs an ultra-wide bandwidth microwave signal. This invention also discloses a broadband microwave signal generation device based on microwave photonics technology. Compared with existing technologies, this invention can generate ultra-wide bandwidth microwave signals in different frequency bands and multiple formats.

The application provides a silicon-based light-controlled nonlinear activation unit, method and photonic neural network, relates to the technical field of silicon-based photonics, and comprises a photodetector, an electro-optic intensity modulator and a bias / interface circuit. A control signal light is converted into a driving electrical signal by the photodetector, directly drives a silicon-based PIN phase modulation arm, and performs intensity domain nonlinear modulation on independent data signal light. The electro-optic intensity modulator combines segmented electrodes and programmable bias to form a single-threshold or double-threshold nonlinear mapping relationship. The bias circuit and the temperature control module ensure that the device maintains a stable operating point under environmental disturbance. The activation unit can be deployed in a cascaded manner in a multi-layer photonic neural network, and a power management module is introduced between layers to dynamically match the control light and data signal light power, thereby ensuring the consistency of the cross-layer nonlinear response. The scheme is compatible with the CMOS process, has the characteristics of low power consumption, scalability and easy programming, and is suitable for on-chip deep photonic neural networks and efficient edge intelligent computing.