32results about How to "Achieving Phase Modulation" patented technology

The invention discloses a broadband radio frequency remote optical transmission link and a transmission method thereof, relating to the microwave photon simulation optical link transmission technology field. The link comprises the following parts: an electric light polarization modulator used for carrying out anti-phase phase modulation on a broadband radiofrequency signal to two carrier wave optical signals of a main shaft and a quadrature shaft and outputting the two carrier wave optical signals to a polarization analyzer; the polarization analyzer used for outputting a modulation optical signal setting a polarization direction; a detector used for demodulating an input modulation optical signal, realizing direct noncoherent synthesis of power, and recovering broadband radio frequency information loaded on the modulation optical signal. The transmission link and the method in the invention have the characteristics of realization of broadband dispersion compensation, simple link structure, low cost and easy adjusting control.

The invention relates to the technical field of semiconductor photoelectronic devices, and discloses a photonic crystal laser array with high brightness and horizontal far-field single distribution. According to the photonic crystal laser array, phase modulation of the laser array output mode is carried out through photonic crystal, and laser output with high brightness and horizontal far-field single distribution is generated. The photonic crystal laser array comprises a module coupling area, a photonic crystal area and a transmission area, wherein the mode coupling area generates a stable opposite-phase mode which is modulated by the photonic crystal area and is converted into a same-phase distribution mode, and the converted mode outputs a single far-field pattern with a narrow divergence angle on the reflection area. The waveguides of the module coupling area, the photonic crystal area and the transmission area are all completed through traditional ordinary photoetching and etching processes. The photonic crystal laser array with high brightness and horizontal far-field single distribution effectively solves the problem that when the output power of a semiconductor transmission laser array is too high, horizontal far-field double distribution and a large divergence angle occur, and generates high-brightness laser, and the brightness of the laser is improved by one level expectedly.

The invention discloses a high-speed low power consumption 16QAM (Quadrature Amplitude Modulation) emitting device which comprises a phaselocked loop frequency synthesizer, a four-dividing frequency divider, a first selected four phase gate I, a first selected four phase gate II, a phase demodulator, a variable gain power amplifier and a 16QAM digital demodulator, wherein the output end of the phaselocked loop frequency synthesizer is connected with the input end of the four-dividing frequency divider; the input end of the four-dividing frequency divider is connected with the output end of the phaselocked loop frequency synthesizer; the input end of the first selected four phase gate I is connected with the output end of the four-dividing frequency divider; the input end of the first selected four phase gate II is connected with the output end of the four-dividing frequency divider; the input end of the phase demodulator is respectively connected with the output ends of the first selected four phase gates, the phase demodulator is used for generating a phase demodulated signal and driving the variable gain power amplifier; the input end of the variable gain power amplifier is connected with the output end of the phase demodulator; the variable gain power amplifier is used for generating two different kinds of signal amplitudes and driving an antenna ohm load; and the output end of the 16QAM digital demodulator is respectively connected with the input ends of the first selected four phase gate, the phase demodulator and the variable gain power amplifier, and the 16QAM digital demodulator is used for carrying out serial parallel conversion on serially input baseband data and forming four parallel data required by the 16QAM demodulation.

The invention discloses a liquid crystal aberration correcting method without wavefront detection. A used system comprises a liquid crystal aberration corrector, an image acquisition module, a convolutional neural network module and a grayscale conversion module. The specific method is as follows: the liquid crystal aberration corrector is used as an executing mechanism to correct distorted wavefront of received light; the image acquisition module is responsible for receiving light beams after liquid crystal correction, and acquiring the light beams as light spot images; after large-amount light spot data training, the convolutional neural network module is used for carrying out fitting according to the light spot images acquired by an imaging system to obtain Zernike coefficients corresponding to light spots; and finally, the grayscale conversion module is used for converting the Zernike coefficients obtained by fitting into grayscale values and controlling the liquid crystal aberration corrector to correct an aberration.

The invention provides an optical device and an optical system. The device comprises a one-layer structure or a multi-layer structure; the structure comprises an upper substrate, at least one intermediate medium layer and a lower substrate which are arranged in sequence; the part between the upper substrate and the intermediate medium layer and the part between the intermediate medium layer and the lower substrate are filled with birefringent materials. The optical device and the optical system can achieve the modulation of phases while the change of the polarization direction of the incidentlight is achieved, and the modulation of the intensity and phases of the incident light can be simultaneously achieved in some application cases. According to the invention, the response speed of a spatial light modulator to a modulated signal can be improved.

The invention discloses a wide-angle Michelson interferometer and a wind field detecting method based on LCoS. The wide-angle Michelson interferometer comprises a tetrahedral beam splitting prism, wherein the beam splitting prism is formed by cementing a right-angled triple prism a and a right-angled triple prism b which are made of the same material and have the same refractive index at a slope, a semireflecting and semitransparent film is plated on a cemented surface, a tetragonal glass cube a is cemented at one side of the right-angled triple prism a, a polaroid sheet is pasted at the other side of the glass cube a, an LCoS reflective liquid crystal is pasted at the other side of the polaroid sheet, a glass cube b is cemented at one side of the right-angled triple prism b, a total reflecting film is plated at the top of the glass cube b, and the glass cube b and the glass cube a are adjacently arranged. The wind field detecting method comprises the steps of applying different voltages onto the LCoS reflective liquid crystal for modulating the phase position of incident light and providing stepping phase positions for light with different wavelengths so as to detect an atmospheric wind field. The interferometer and the wind field detecting method have small power consumption, good anti-seismic performance and considerable cost.

Embodiments of the invention provide a waveguide phase shifter and a preparation method thereof. The waveguide phase shifter comprises a semiconductor substrate comprising at least a substrate layer,an oxide layer, and a top silicon layer. The oxide layer is located between the substrate layer and the top silicon layer. A waveguide array is etched the on the top silicon layer. The waveguide arrayis at least one horizontally arranged ridge waveguide, and at least one highly doped region corresponding to the ridge waveguide is formed by ion implantation at a horizontal position of the top silicon layer close to the ridge waveguide. A first metal electrode for connecting power source anode and a second metal electrode for connecting power source cathode are respectively formed on upper surfaces at both ends of each highly doped region. The waveguide phase shifter provided by the embodiments of the invention provides a heated highly doped region on the side of the ridge waveguide, thereby realizing phase modulation of light wave passing through the ridge waveguide, which improves the heating efficiency of the ridge waveguide and improves the adjustment range of the phase.

The invention discloses a data signal and monitoring signal sending and receiving method and device. It is avoided that a complex and expensive optical coherent receiver is configured on a monitoring node to receive and demodulate monitoring signals. The method includes the steps of determining data signals and monitoring signals to be sent at a sending end, conducting high-frequency coherent phase modulation on the data signals, conducting low-frequency amplitude modulation on the monitoring signals, adding the monitoring signals where amplitude modulation is conducted to the data signals where phase modulation is conducted, and sending the signals to a receiving end. When the receiving end receives the signals, the signals are filtered on a frequency domain through a low pass filter, and then the noise-contained monitoring signals where low-frequency amplitude modulation is conducted can be obtained and received by an ordinary low-frequency optical detector, then the monitoring signals can be obtained through low-frequency electric domain signal processing, and it is avoided that the complex and expensive optical coherent receiver is configured on the monitoring node to receive and demodulate the monitoring signals.

Techniques are described to form an optical waveguide switch that could reach a very high extinction ratio. In particular, this disclosure describes an asymmetric MZI, in which different waveguide capacitor structures are used in two arms of the MZI: a first arm with a waveguide capacitor to achieve the mainly phase modulation and a second arm with a waveguide capacitor to achieve mainly the magnitude modulation, respectively. Using the asymmetric MZI in accordance with this disclosure, one can design an algorithm to achieve almost unlimited extinction ration during the switching operation.

The invention belongs to an optical device part in the field of optical fiber communication, and particularly relates to a multi-core optical fiber modulator. The multi-core optical fiber modulator consists of an input end, an electro-optical modulation end, a V-shaped slot and an output end, wherein the input end consists of a three-core single-mode optical fiber; the electro-optical modulation end consists of a lithium niobate substrate, four light waveguides etched by a proton exchange method, a metal electrode and a direct current voltage source; the metal electrode is divided into a negative electrode and a positive electrode; the output end is a three-core single-mode optical fiber. The input and output optical fibers of the multi-core optical fiber modulator adopt multi-core optical fibers which reduce the cost of an optical fiber and increase the intensity; furthermore, the advantage of measuring a plurality of parameters simultaneously can be realized.

MZ modulator is in the structure of electrodes with common ground. The chatter magnitude can be adjusted by changing the radio frequency voltage on the radio frequency electrode of the MZ modulator. The magnitude of chatter coefficient is equal to the ration between the sum of the phase shift (psi aRF +psi bRF) and the difference of the phase shift (psi aRF -psi bRF) caused by the radio frequency voltages at upper and lower branches. The invented method can control the generated chatter magnitude simply and accurately by adjusting the drive voltage, realizing intensity modulation and phase modulation so as to improve the system transmission performances of the optical fiber transmission system.

The invention discloses a spatial light modulator and a display device and relates to the technical field of display. The modulator comprises a substrate and multiple phase modulation units which arearranged on one side of the substrate in an array manner. Any phase modulation unit comprises multiple electrodes. Each electrode comprises a first electrode and a second electrode. The first electrodes and the second electrodes, which are arranged in the position away from the substrate direction, are alternatively arranged. A piezoelectric layer is clamped between each first electrode and the corresponding second electrode and comprises piezoelectric materials. According to the invention, response time of the spatial light modulator is reduced.

The invention provides a linear reflection-type electro-optic phase modulator. The modulator comprises a substrate, an optical waveguide, a modulating electrode, high reflecting film and a circulator,wherein the substrate is rectangular; a linear groove is formed in one side of the substrate, and the optical waveguide with the structure same with that of the linear groove is embedded in the linear groove; the high reflecting film is arranged at one end of the optical waveguide, and the circulator is perpendicularly arranged at the other end; the modulating electrode comprises a positive modulating electrode and a negative modulating electrode which are respectively parallelly arranged at the two sides of the optical waveguide, and phase modulation is achieved; the modulator adopts electro-optical crystal or organic matter as the substrate, and the electrooptical effect of the electro-optical crystal is utilized to change the refractive index of materials so as to achieve the phase modulation; the waveguide end surface of the optical waveguide is coated with the high reflecting film, and light beam reflection is achieved; the positive modulating electrode and the negative modulating electrode are applying and acting passages of a modulating signal; the provided linear reflection-type electro-optic phase modulator can reduce half-wave voltage under the premise of not increasingthe length of the modulator, the modulator size is reduced, the modulator is beneficial for integration, the practicability is good, and actual application value is achieved.

The invention provides an all-fiber high-speed phase modulator based on acousto-optic action, which comprises a surface acoustic wave generating device and an optical fiber, the surface acoustic wave generating device is used for generating a surface acoustic wave band, the optical fiber is perpendicular to the propagation direction of the surface acoustic wave band and is arranged in an area where the surface acoustic wave band exists, and the surface acoustic wave band is coupled with the optical fiber. Strain is generated in the optical fiber, so that the refractive index in the optical fiber is changed, and high-speed phase modulation of the optical fiber is realized. The optical fiber is fixed at the position where the surface acoustic wave band exists in the direction perpendicular to the propagation direction of the surface acoustic wave band, so that the refractive index in the optical fiber is changed, the surface acoustic wave band is band-shaped, and the whole section of the optical fiber can be fixed at the position where the surface acoustic wave band exists, namely, the surface acoustic wave band can perform phase modulation on the whole section of the optical fiber at the same time; therefore, the modulation efficiency is high, the optical fiber phase modulation can be realized only by adopting one acoustic surface wave generation device, and the structure is simpler.

The invention relates to a phase modulation method based on phonon polaritons, the method is applied to a phase modulation device, and the phase modulation method comprises the following steps: using scattered light or infrared light as incident light to irradiate a metal antenna, and exciting a molybdenum oxide layer to derive molybdenum oxide phonon polaritons; regulating and controlling the carrier concentration of the graphene strip by adjusting the chemical doping time of the graphene strip; according to the method, the dispersion of the hybrid mode of the graphene plasmon and the molybdenum oxide phonon polaritons is adjusted, the phase velocity of the hybrid mode of the molybdenum oxide phonon polaritons transmitted to a graphene strip area is changed, and the phase modulation of the molybdenum oxide phonon polaritons is realized; the graphene plasmon is generated by irradiating and exciting the graphene strip by incident light. The phase modulation method is based on the phase modulation device, and continuous dynamic regulation and control of the molybdenum oxide phonon polariton transmission phase are achieved by changing the carrier concentration of a graphene strip.

The invention provides a sound detection and positioning system, and the system comprises a sound sensor array and a sound wave conduit array, wherein the sound sensor array comprises N sound sensor units, and N is not less than two. The sound wave conduit array comprises M sound wave conduits, wherein M is not less than two. Two ends of each sound wave conduit are opened and connected and are shaped like a circular pipe, wherein one end of each sound wave conduit is connected with the corresponding sound sensor unit, and the other end of each sound wave conduit is disposed in the air. A sound signal transmitting in the air enters into the sound wave conduits of the sound wave conduit array, and then is received by the sound sensor units of the sound sensor array. The system is small in size, is light in weight, and is portable. The sound sensor array is compact in structure, and difference on the sound sensor units from an external environment is small. The measurement accuracy of the system is high.