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46results about How to "Reduce Relative Intensity Noise" patented technology

Methods of hyperdoping semiconductor materials and hyperdoped semiconductor materials and devices

Methods are disclosed for producing highly doped semiconductor materials. Using the invention, one can achieve doping densities that exceed traditional, established carrier saturation limits without deleterious side effects. Additionally, highly doped semiconductor materials are disclosed, as well as improved electronic and optoelectronic devices/components using said materials. The innovative materials and processes enabled by the invention yield significant performance improvements and/or cost reductions for a wide variety of semiconductor-based microelectronic and optoelectronic devices/systems. Materials are grown in an anion-rich environment, which, in the preferred embodiment, are produced by moderate substrate temperatures during growth in an oxygen-poor environment. The materials exhibit fewer non-radiative recombination centers at higher doping concentrations than prior art materials, and the highly doped state of matter can exhibit a minority carrier lifetime dominated by radiative recombination at higher doping levels and higher majority carrier concentrations than achieved in prior art materials. Important applications enabled by these novel materials include high performance electronic or optoelectronic devices, which can be smaller and faster, yet still capture or emit light efficiently, and high performance electronics, such as transistors, which can be smaller and faster, yet cooler.
Owner:YALE UNIV

Methods of hyperdoping semiconductor materials and hyperdoped semiconductor materials and devices

Methods are disclosed for producing highly doped semiconductor materials. Using the invention, one can achieve doping densities that exceed traditional, established carrier saturation limits without deleterious side effects. Additionally, highly doped semiconductor materials are disclosed, as well as improved electronic and optoelectronic devices / components using said materials. The innovative materials and processes enabled by the invention yield significant performance improvements and / or cost reductions for a wide variety of semiconductor-based microelectronic and optoelectronic devices / systems.Materials are grown in an anion-rich environment, which, in the preferred embodiment, are produced by moderate substrate temperatures during growth in an oxygen-poor environment. The materials exhibit fewer non-radiative recombination centers at higher doping concentrations than prior art materials, and the highly doped state of matter can exhibit a minority carrier lifetime dominated by radiative recombination at higher doping levels and higher majority carrier concentrations than achieved in prior art materials. Important applications enabled by these novel materials include high performance electronic or optoelectronic devices, which can be smaller and faster, yet still capture or emit light efficiently, and high performance electronics, such as transistors, which can be smaller and faster, yet cooler.
Owner:YALE UNIV

Vibration sensing device based on photoelectric oscillator

The invention discloses a vibration sensing device based on a photoelectric oscillator, and the device comprises a laser, a one-in-two optical coupler, an optical phase shifter, a sensing head, a polarization controller, a Mach-Zehnder modulator, a two-in-one optical coupler, an energy-storage optical fiber, a photoelectric detector, a band-pass filter, a radio frequency amplifier, a 3dB power divider, a reference oscillator, a frequency mixer, a low-pass filter, an analog-to-digital converter, and an upper computer. According to the invention, one arm of the Mach-Zehnder modulator serves as the sensing head, thereby improving the sensitivity of vibration signal detection, and improving the detection precision. Compared with other passive optical fiber sensors, the device enables vibration information to be coded on the frequency of the vibration signal not the intensity, so the device is not sensitive to the impact from the power fluctuation of a light source. Compared with an optical fiber based on an optical fiber laser, the device is higher in sensitivity, and the sensitivity of the device is not related with the oscillation frequency. The device can be implemented through a low-cost low-frequency device, and is high in practicality.
Owner:ZHEJIANG UNIV

Optical fiber interferometer sensor disturbance signal demodulation device based on single sideband frequency modulation

The invention discloses an optical fiber interferometer sensor disturbance signal demodulation device based on single sideband frequency modulation. The optical fiber interferometer sensor disturbancesignal demodulation device based on the single sideband frequency modulation comprises a laser, a modulator, a frequency modulation source, an optical filter, an optical amplifier, an optical isolator, a Michelson interferometer, a PZT, a photodetector and a data sampling card. The optical fiber interferometer sensor disturbance signal demodulation device based on the single sideband frequency modulation disclosed by the invention introduces a microwave frequency modulation source and uses a frequency sweeping method, so as to avoid high requirements of the traditional internal modulation PGCmethod for a direct modulation laser source and reduce a relative intensity noise; and the invention adopts a 12-point quadrature demodulation algorithm to avoid additional electrical noise caused bythe use of an electric mixer, therefore, the measurement dynamic range is large and fully automatic measurement can be realized, the demodulation algorithm is simplified, and the cost is reduced; meanwhile, the system disclosed by the invention can effectively detect array sensors of any distribution, so that the applicability of the system is stronger.
Owner:ZHEJIANG UNIV

Random four-state modulation method of digital closed-loop fiber-optic gyroscope

ActiveCN110006417AReduce Modem Signal CorrelationReduce resource usageSagnac effect gyrometersFiberGyroscope
The invention discloses a random four-state modulation method of a digital closed-loop fiber-optic gyroscope. The random four-state modulation method of the digital closed-loop fiber-optic gyroscope comprises the steps that a pseudo-random number generator is utilized to generate a pseudo-random number sequence, and a multi-state modulation state memory and state transition moment are established;a random modulation state selector is constructed, a random pseudo-random number is selected, and a modulation state is selected from the multi-state modulation state memory; state transition outputis completed according to the pseudo-random number and the modulation state combined with a state transition matrix; a modulation state delayer is established, a random modulation four-state phase position is generated, and based on the random modulation four-state phase position, a demodulation mark is generated in a combined mode; and the demodulation of the fiber-optic gyroscope angular rate and 2 pi voltage is completed by using the demodulation mark. According to the technical scheme of the random four-state modulation method of the digital closed-loop fiber-optic gyroscope, aiming at theproblems of gyroscope random drift and dead zones caused by electronic crosstalk between modulation signals and demodulation signals of the digital closed-loop fiber-optic gyroscope, the random four-state modulation method of the digital closed-loop fiber-optic gyroscope is adopted, the precision of the fiber-optic gyroscope can be improved, the working stability of the fiber-optic gyroscope is ensured, and the random four-state modulation method of the digital closed-loop fiber-optic gyroscope has great practical significance.
Owner:HUBEI SANJIANG AEROSPACE HONGFENG CONTROL

Device and method for improving stability of fiber-optic gyroscope

InactiveCN112797973AHigh central wavelength stabilityLow relative intensity noiseSagnac effect gyrometersDigital signal processingPhase modulation
The invention discloses a device and a method for improving the stability of an optical fiber gyroscope, and belongs to the technical field of optical fiber sensing. After two lasers with different wavelengths are combined, a spectrum is broadened synchronously through an external phase modulation technology, modulated light enters a Y-shaped multifunctional integrated optical device through a coupler and is divided into two beams to be output, the two beams of light are transmitted in a polarization maintaining optical fiber ring in the clockwise direction and the anticlockwise direction respectively, and finally the two beams of light are combined into one beam again and interfere with each other. Two wave crests in interference optical signals are separated, two photoelectric detectors are used for synchronous detection to convert the optical signals into electric signals, a digital signal processing unit demodulates carrier rotation angular velocity information corresponding to the two electric signals, and the carrier rotation angular velocity information is output after the influence of environmental factors is eliminated through differential processing. Compared with a traditional fiber-optic gyroscope using a single wide-spectrum light source, the fiber-optic gyroscope provided by the invention has the advantages that the influence of temperature disturbance and the like on the precision of the gyroscope can be remarkably reduced, the noise is low, the scale factor stability is high, and a high-performance fiber-optic gyroscope can be formed.
Owner:ZHEJIANG UNIV

A random four-state modulation method for digital closed-loop fiber optic gyroscope

The invention discloses a random four-state modulation method for a digital closed-loop fiber optic gyroscope, which includes: using a pseudo-random number generator to generate a pseudo-random number sequence, and establishing a multi-state modulation state memory and state transfer torque; constructing a random modulation state selector to select any A pseudo-random number, and select a modulation state from the multi-state modulation state memory; complete the state transition output according to the pseudo-random number and modulation state combined with the state transition matrix; establish a modulation state delayer, generate a random modulation four-state phase, based on random modulation The four-state phase combination generates a demodulation mark; the demodulation of the angular rate of the fiber optic gyroscope and the 2π voltage is completed by using the demodulation mark. The technical solution of the present invention aims at the problem of random drift and dead zone of the gyroscope caused by the electronic crosstalk between the modulation and demodulation signals of the digital closed-loop fiber optic gyroscope, and adopts the random four-state modulation method of the fiber optic gyroscope, which can improve the accuracy of the fiber optic gyroscope and ensure the working stability of the fiber optic gyroscope. greater practical significance.
Owner:HUBEI SANJIANG AEROSPACE HONGFENG CONTROL
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