16 results about "Intensity modulator" patented technology

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.

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.

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 provides a sensitivity-enhanced temperature measurement device based on an optoelectronic oscillator, comprising: a laser, an intensity modulator, a delay line interferometer, a sensitive arm fiber optic unit located in the space where the signal to be measured is located, a reference arm fiber optic unit, a photodetector, a microwave amplifier, a bandpass filter, a power divider, and a frequency measurement section. The intensity modulator generates an optical signal containing two frequency components: a carrier wave f0 and a first-order single-sideband wave f1. The delay line interferometer then separates these two frequency components, allowing them to propagate separately along the reference arm and sensitive arm fibers. These components are then returned to the delay line interferometer and combined to output an optical signal whose phase contains the temperature signal to be measured. The phase change of the optical signal caused by the temperature signal to be measured is then converted into a frequency change in the microwave signal output by the optoelectronic oscillator. This invention also provides a sensitivity-enhanced temperature measurement method. The device provided by this invention can effectively improve the sensitivity of temperature detection.

Embodiments of the present disclosure are directed to an integrated circuit with a photonic processor and an electrical analog memory. The integrated circuit further includes an array of photonic intensity modulators coupled to the photonic processor via a first set of optical connections, and an array of photodetectors coupled to the photonic processor via a second set of optical connections. The electrical analog memory is directly coupled to the array of photodetectors and the array of photonic intensity modulators.

This invention relates to a Brillouin optical time-domain analyzer chip and system, comprising: a light source selection and distribution unit, a probe light generation unit, a pump light generation unit, a light detection unit, an optical signal port, and an electrical signal port; external light source and laser signals are input through the optical signal port and respectively input to the probe light generation unit and the pump light generation unit through the light source selection and distribution unit; the probe light generation unit includes an IQ modulator and a filter based on a dual parallel Mach-Zehnder modulator structure; the pump light generation unit includes two cascaded intensity modulators based on a Mach-Zehnder modulator structure and a polarization controller; the light detection unit includes a photodetector for receiving the probe light input. Compared with the prior art, this invention integrates the core optoelectronic devices of the Brillouin optical time-domain analyzer sensing system onto a silicon photonics chip, effectively achieving temperature sensing while maintaining high performance, meeting application requirements.

This invention discloses a picosecond-level laser pulse generation device and method. It directly generates laser pulses with a dynamic extinction ratio of over 50dB by driving a laser with a radio frequency drive signal without DC bias. This allows for the simple reuse of conventional electro-optic intensity modulators to achieve a dynamic extinction ratio of over 100dB on the laser pulse. The high bandwidth characteristics of the electro-optic intensity modulator also allow the laser pulses directly generated by the laser to have a picosecond-level pulse width. Ultimately, this allows for the provision of laser pulses with a dynamic extinction ratio greater than 100dB and a picosecond-level pulse width through a solution with smaller device size, wider bandwidth, lower cost, and lower power consumption, while meeting the requirements of long-distance detection and high-resolution detection.

This invention provides an on-chip terahertz signal generator and its fabrication method. A radio frequency signal with a frequency of is input via a probe. An intensity modulator and a phase modulator modulate a continuous laser beam to generate an electro-optic frequency comb with equal frequency intervals. When the electro-optic frequency comb passes through the signal generation module, a terahertz signal is generated through sideband parametric down-conversion of the optical frequency based on second-order nonlinear optics. Finally, the terahertz signal is radiated outward through the signal radiation module without introducing significant phase noise, thus improving the quality of the generated terahertz signal. Furthermore, this invention integrates the electro-optic frequency comb generation module, the signal generation module, and the signal radiation module on the same substrate, eliminating the complex spatial optical path alignment and waveguide coupling of traditional discrete component systems. This greatly improves the system's stability, reliability, and compactness. In addition, this invention avoids dependence on expensive femtosecond pulsed laser sources, reducing the cost of generating terahertz signals.

This invention belongs to the field of distributed fiber optic sensing technology, specifically relating to a BOCDA fiber optic sensing device and method based on linearly frequency-modulated pulse pumping. The device includes a laser, fiber coupler, first electro-optic phase modulator, first erbium-doped fiber amplifier, optical isolator, sensing fiber, second electro-optic phase modulator, electro-optic intensity modulator, electro-optic pulse signal modulator, polarization scrambler, second erbium-doped fiber amplifier, optical circulator, optical filter, photodetector, low-pass filter, and data acquisition and analysis system. Because the pump light pulse frequency changes linearly, the change in probe light amplitude over time directly carries Brillouin gain spectrum information, thus avoiding scanning the pump-probe light frequency difference. Therefore, only a one-dimensional scan is needed to complete a measurement, significantly shortening the measurement time of the BOCDA fiber optic sensor.

The application provides a lithium battery multi-physical quantity measurement system in the field of lithium battery physical quantity measurement, and specifically comprises a to-be-measured optical fiber, a pump laser, an optical amplifier, a probe light path, an intensity modulator, a fourth coupler, a wavelength division multiplexer, a measurement interferometer, an auxiliary interferometer, a data acquisition card and an upper computer; the application combines the fiber-optic photothermal spectroscopy system and the OFDR together, and the two systems share the pump laser, and the data upper computer is also shared; the FP cavity for gas concentration measurement and the FUT are connected together, wherein the photothermal spectroscopy system for gas concentration measurement usually uses 1550nm light waves for detection, and the OFDR system adopts a pump light system for detection, and the light wave ranges of the two do not interfere with each other.

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

This invention discloses a Nyquist folding reception method and system based on a broadband optical comb. The method includes generating equally spaced optical local oscillators with doubled bandwidth in the optical domain using a continuous wave light source and cascaded intensity modulators and dual-phase modulators. The cascaded modulators are simultaneously driven by a baseband SFM signal, and the modulation index and DC bias are jointly adjusted to achieve effective broadening and balanced distribution of the high-order spectrum. After the target RF signal and the optical local oscillator are mixed in the optical domain, the high-frequency RF signal is folded into the low sampling rate observation band by photoelectric detection and low-pass filtering. The time-frequency characteristics of the folded signal are used to determine the Nyquist zone index and reconstruct the signal. This invention does not require high-speed position modulation optical pulses, has a compact system structure, and is simple to implement. It achieves real-time reception of ultra-wideband RF signals under low-speed sampling conditions and is suitable for applications such as broadband radar, wireless communication, and cognitive wireless.

This invention discloses a quantum state encoding device and method that does not require a long delay line. It utilizes random, minute radio frequency signals to modulate a laser to adjust the phase difference between pulse pairs, and simultaneously employs chopping to achieve a constant phase difference between the two laser pulses in the pulse pair. This eliminates the need for a long-delay interferometer or multiple lasers for injection locking, thus simultaneously satisfying the requirements of phase randomization between pulse pairs and a constant or specific phase difference between the two laser pulses in a pulse pair. Furthermore, this invention can be implemented using conventional lasers, intensity modulators, and phase modulators, facilitating chip integration and resulting in high yield and good stability.

The present disclosure relates to a system for parallel laser processing. The system has a laser for generating a laser beam, and a light modulator subsystem. The light modulator subsystem may have a modulator component for modulating at least one of a phase or amplitude of light from the laser beam, and a plurality of independently controllable pixels for enabling a phase to amplitude transformation on the light from the laser beam which impinges the light phase modulator component. The light modulator component generates a patterned light beam in accordance with a bit pattern provided by the independently controllable pixels. A non-imaging metalens array patterns the light beam. The metalens array may have a plurality of metalens units which each correspond to a plurality of pixels of the intensity modulator component, for parallel processing a material in at least one of an additive manufacturing printing operation or a material processing operation.