60results about "Light demodulation" patented technology

An optical comb generator receives light from at least two continuous wave laser sources, produces a different frequency comb from each laser source, and produces an output that it the simultaneous combination of the different frequency combs. The different frequency combs span different frequency bands, but at least partially overlap in frequency with an adjacent comb in a region of overlap. A spectral filter produces a filtered output that has at least one pair of tones from the region of overlap, the pair of tones comprising one tone from each of two adjacent combs. Feedback control based on the filtered output is applied to adjust the light entering the comb generator such that the frequencies and phases of the pair of tones from the region of overlap are aligned. In this way, the multiple different overlapping combs are stitched together to form a single seamless comb spanning a broader frequency range.

The optical device according to the present invention comprises: a lower electrode; a lower cladding on the lower electrode; a first input waveguide, a second input waveguide, a first distribution unit, a first output waveguide, a second output waveguide, a second distribution unit, a first core, and a second core which are on the lower cladding; an upper cladding which covers the first and second cores; and an upper electrode on the upper cladding. The first input waveguide, the second input waveguide, the first core, and the second core are connected to the first distribution unit. The first output waveguide, the second output waveguide, the first core, and the second core are connected to the second distribution unit.

Voltage waveform (V S1 (t), V F1 A method for generating voltage pulses (V1(t), V2(t)) includes: - providing an optical signal (CLB1) including one or more optical pulse sequences (OPAT1, OPAT2); - distributing the optical pulses (OPAT1) to a plurality of photoelectric conversion units (OEU1, OEU2) via optical waveguides (CWG1, CWG2); - using the photoelectric conversion units (OEU1, OEU2) to convert the optical pulses (OPAT1, OPAT2) into electrical driving current pulses (EPAT1); and - generating voltage pulses (V1(t), V2(t)) by driving a Josephson junction (JJ1) with the electrical driving current pulses (EPAT1).

Provided is a frequency reference optical transmission device that can transmit a frequency reference light in a transmission system for a transmission technology with high precision of frequency that has the configuration of a system that detects interference light of frequency reference lights in a fiber length fluctuation compensation unit. The optical interference circuit according to the present disclosure is formed using a waveguide on a substrate, and comprises a first coupler that branches light inputted from a reproduction reference light input port into A + 1 (A ≥ 1) lights, a partial reflecting circuit that reflects a portion and transmits a portion of light inputted from a reference light input / output port, one frequency synchronization detection circuit that generates a first interference light obtained by interference of the light transmitted from the partial reflecting circuit and a portion of reproduction reference light branched by the first coupler, and A transmission path length fluctuation detection circuits that generate a second interference light obtained by interference of a portion of the reproduction reference light outputted from the other side of the first coupler and light inputted from a transmission path fiber input / output port.

An interferometric resonator optical gyroscope includes an optical frequency comb generator configured to generate an optical frequency comb. Optical signals representative of the optical frequency comb pass through an optical resonator in different directions, and a rotation rate is determined based on the extent of interference between the optical signals. Parameters of the optical frequency comb generator can be controlled by a control servo based on an intensity of the optical signals after propagating in the optical resonator. Utilizing an optical frequency comb generator reduces the bias error during gyroscope operation.

A frequency synchronization device (100) comprises: an optical frequency comb generation unit (112) that generates an optical frequency comb as a function for causing synchronization with an optical frequency standard of a master clock; an fbeat detection unit (111) that, on the basis of the optical frequencies generated by the optical frequency comb generation unit (112), detects the differential frequency fbeat between a prescribed comb of the optical frequency comb and the optical frequency standard of the master clock; an frep control unit (113) that, during normal times, controls the interval frep of the optical frequency comb such that the detected fbeat becomes constant; an oscillator (141) for holdover that synchronizes the normal frep with an electrial frequency; and a memory (142) that accumulates data for holdover.

The disclosure relates to a transducer arrangement for transducing signals according to at least one of the following alternative modes of operation: a) transduction from microwaves to mechanical waves, and vice versa; b) transduction from mechanical waves to optical waves, and vice versa; c) transduction from microwaves to optical waves, via mechanical waves, and vice versa; said arrangement further comprising: a transducer device (EMT; OMT; hybrid EMT-OMT) having a region which is either optomechanically or electromechanically active, or both, for said transduction; and a substrate The transducer device (EMT; OMT; hybrid EMT-OMT) is clamped to the substrate in a manner so that said active region has at least one side in full contact with said substrate.

The invention relates to a current-assisted photonic demodulator (1), adapted to detect light radiation, comprising:a detection portion (10), made based on germanium, extending vertically between a rear face (Far) and a front face (Fav) parallel with a main plane, the front face (Fav) being intended to receive light radiation, comprising modulation regions (11) and collection regions (12);a dielectric layer (22), made of at least one electrically insulating material, and extending on and in contact with the rear face (Far);at least one central electrode (EC), intended to be positively polarized, partially passing through the dielectric layer (22) and spaced apart from the rear face (Far) by a non-zero distance, located facing the central zone (Zc) and disposed, in projection in the main plane, between the modulation regions (11).

Title: Frequency Converter with Optical Resonators The invention relates to a frequency converter (1) comprising a first surface (10) for receiving signal radiation (S) with a frequency fs and pump radiation (P) with a frequency fp, the first surface comprising an array of optical resonators (11) configured to generate, from the signal radiation (S) and the pump radiation (P), converted radiation (C) with a frequency fs + fp, referred to as the sum frequency and denoted fSFG. The converter further comprises a filtering device (20) and a second surface (30) configured to receive the converted radiation (C) and to focus it away from the converter. The filtering device is configured to receive the converted radiation and the pump radiation from the first surface (10) and to limit the propagation of the pump radiation from the first surface (10) to the second surface (30).Figure for the abridged version: Fig.1A.

To provide a terahertz wave generator and a terahertz wave generation method that can generate terahertz waves with high efficiency. [Solution] The terahertz wave generator 1 comprises an oscillator 2 that oscillates ultrashort pulse light L, a fiber amplifier 3 that broadens the spectrum of the ultrashort pulse light L oscillated by the oscillator 2, a soliton shift fiber 6 that modulates the wavelength of the ultrashort pulse light L whose spectrum has been broadened by the fiber amplifier 3 using soliton self-frequency shift, and an organic crystal 9 that generates terahertz waves when irradiated with the ultrashort pulse light L modulated by the soliton shift fiber 6.

There is a need for laser systems which generate single-sideband modulated laser radiation in a predictable manner, namely with a frequency spacing between the carrier and sideband in the (high) MHz to GHz range. For this purpose, the invention proposes a laser system which has a laser source (1) that emits laser radiation (2). A first modulation device is provided for modulating the frequency of the laser radiation (2), said frequency modulation being carried out using a frequency modulation shift at a modulation frequency. A second modulation device which is independent of the first modulation device is provided for modulating the amplitude of the laser radiation, said amplitude modulation being carried out using an amplitude modulation shift at the same modulation frequency. The frequency modulation and the amplitude modulation are coupled together in a phase-locked manner, wherein the frequency modulation shift, the amplitude modulation shift, and the relative phase of the frequency modulation and the amplitude modulation are set in such manner that the spectrum of the frequency- and amplitude-modulated laser radiation has a carrier (4', 4'') and a single sideband (5', 5'') which is spaced from the carrier (4', 4'') by the value of the modulation frequency.

An RF receiver may include antenna elements to receive RF signals, and electro-optic modulators to generate corresponding upconverted optical signals by mixing an RF signal with an optical carrier beam. The RF receiver may include a transmission array having a first bundle of optical waveguides that receive and transmit upconverted optical signals from their ends. The ends may be arranged in a first pattern. The RF receiver may include an interference space to receive the upconverted optical signals to form a composite beam, and an array of single mode optical fibers that have lenses positioned in a detection plane to receive a portion of the composite beam. The first pattern of the ends generates an RF emitter interference pattern at the detection plane, and the single mode optical fiber lenses have a geometric arrangement that corresponds to the first RF emitter interference pattern.

To modify some of the characteristics of the light pulses generated by an extreme ultraviolet light source. [Solution] An extreme ultraviolet (EUV) light pulse is formed by illuminating a semiconductor material of a modulation system with a first light beam having a first wavelength, applying a voltage to the semiconductor material for a certain duration that is sufficient to modify the refractive index of the semiconductor material so that the polarization state of a light beam having a second wavelength passing through the semiconductor material is modified and passes through at least one polarization-based optical element of the modulation system, and passing the semiconductor material through a second light beam having a second wavelength for the duration thereof to form a light pulse.

To provide an optical microphone capable of controlling directivity toward a sound source.SOLUTION: An optical source 110, a first optical splitter 120 that splits light from the optical source into reference light and measuring light, a second optical splitter 130 that splits the measuring light into N pieces of measuring light, a first emitting unit 141 that emits the N pieces of measuring light to a S1 of a predetermined space, a first light receiving unit 145 that receives the N pieces of measuring light 144 propagated through the predetermined space, a third optical splitter 150 that splits the reference light into N pieces of measuring light, and N optical couplers 161 to 168 that couple the N pieces of measuring light and the N pieces of reference light on a one to-one basis; N photodetectors 171 to 178 that receive the N coupled light beams and detect interference between the measurement light beam and the reference light beam in each of the N coupled light beams, and a control unit 180 that controls directivity of sound collection by performing signal processing on N detection signals output from the N photodetectors are provided, the N measurement light beams are arranged in parallel at equal intervals in a predetermined space, and the control unit sequentially delays the N detection signals by a predetermined time interval and adds the detection signals.SELECTED DRAWING: Figure 2

Systems and methods for upconverting near-infrared wavelengths to higher-energy wavelengths are provided. Various material combinations can be implemented to upconvert the near-infrared to higher-energy wavelengths including visible wavelengths via TTA-UC. The TTA-UC systems can be further combined with plasmonic structures and / or thin films to enhance absorption and emission.

The invention relates to a device (10) for filtering light with features of claim 1, a system (34) and a method for filtering light with such a device (10).

The optical frequency of one mode of an optical comb can be changed by more than half the repetition frequency of the optical comb. [Solution] The optical comb light source 1 outputs an optical comb having multiple modes. The optical comb light source 1 includes an optical comb generation unit 11 that generates an optical comb, an optical frequency change unit 14 that receives a reference wavelength light having a predetermined optical frequency νcw and changes the optical frequency νcw of the reference wavelength light to output, a mode optical frequency νm which is the optical frequency of one of the multiple modes, and a target optical frequency νcw+f which is the optical frequency of the output of the optical frequency change unit 14. AO The difference between this and the predetermined value (beat frequency) f beat The optical comb generation unit 11 includes a mode optical frequency control unit 18 that controls the mode optical frequency to achieve the desired result. The optical comb generation unit 11 changes the optical frequencies of multiple modes according to the controlled mode optical frequency νm to produce the output of the optical comb light source 1.

An optical frequency comb device includes: an optical waveguide; a first mirror disposed at a first position of the optical waveguide; a second mirror disposed at a second position of the optical waveguide different from the first position; a gain medium and a saturable absorber disposed between the first mirror and the second mirror; and a control unit that fixes one of a repetition frequency and a carrier envelope offset frequency of an optical frequency comb output from an end of the optical waveguide and changes the other.

Systems and methods of forming a waveguide are presented herein. The system comprises a waveguide assembly comprising a substrate defining a substrate refractive index. The system further comprises a waveguide formed within the substrate defining a waveguide refractive index, which is different than the substrate refractive index. The waveguide comprises a first end defining a first width, a second end defining a second width, and a curved section extending between the first end and the second end. The curved section defines a third width extending between an inside edge and an outside edge. The third width is different than at least one of the first width and the second width.

By inputting a modulation signal from a synthesizer circuit 11 to a switching circuit 13 via isolator elements 12A, 12B by inserting the isolator elements 12A, 12B between the synthesizer circuit 11 and the switching circuit 13, an operation of the synthesizer circuit 11 is prevented from being unstable with a load fluctuation by an opening or a short-circuit of circuits after the switching circuit, so an operation of the synthesizer circuit 11 will not be unstable by a load fluctuation when switching driving signals supplied to optical comb generators 14A, 14B by the switching circuit 13, and a driving state is transited by switching the driving signals of the optical comb generators 14A, 14B rapidly.

The application discloses a goaf slurry filling automatic monitoring device and method, which comprises a filling substation, a monitoring substation and an underground total control terminal; with the forward movement of a coal mining face, a sensing optical cable is automatically arranged in a goaf; in the slurry filling process, the sensing optical cable temperature and strain parameters are monitored in real time through a demodulation host; the data of each substation are comprehensively processed through the underground total control terminal; the filling effect of each filling casing pipe slurry is evaluated; and whether to stop filling and the working face advancing after condensation are intelligently controlled. The application can judge the filling effect of the slurry and has good monitoring effect.

The present invention realizes terahertz wireless transmission with low phase noise and high output. A coherent combining photoelectric conversion apparatus transmits, from a transmission antenna, a wireless signal obtained by modulating a carrier signal with a baseband signal including an information signal, and includes: a micro-optical resonator (2) that is excited by laser light and generates an optical frequency comb with a frequency interval frep that is 100 GHz or more and 3 THz or less; a modulated signal generation unit (3) that separates a plurality of mutually adjacent optical frequency mode pairs from the optical frequency comb, and optically modulates one optical frequency mode of each pair using the same baseband signal; a photoelectric conversion element unit (4) that is provided in the transmission antenna and includes one or more photoelectric conversion elements that mix the optical frequency modes of each pair to generate a group of high-frequency electromagnetic wave signals having a frequency interval equal to the frequency interval frep; and phase offset adjustment units (301, 302) that adjust a phase offset between the group of high-frequency electromagnetic wave signals.

To provide a method for producing a photo-upconversion organic film that has a low environmental impact and can produce a high-quality photo-upconversion organic film, a photo-upconversion organic film manufacturing apparatus, and a photo-upconversion organic film. [Solution] The method involves a precursor holding step (S1) in which a powder precursor containing a triplet sensitizer and an organic light-emitting material is held in a holding space of a precursor holding section having a holding space of height in the Z direction; a pressing step (S2) in which the powder precursor is pressed along the Z direction; and a temperature control step in which the first temperature, which is the temperature of the first end of the powder precursor, and the second temperature, which is the temperature of the second end of the powder precursor, are heated to a temperature above the melting point of the organic light-emitting material, and then the temperature of the first and second temperatures is gradually reduced to below the freezing point of the organic light-emitting material while maintaining the temperature difference between the first and second temperatures.

An interferometric resonator optical gyroscope includes an optical frequency comb generator configured to generate an optical frequency comb. Optical signals representative of the optical frequency comb pass through an optical resonator in different directions, and a rotation rate is determined based on the extent of interference between the optical signals. Parameters of the optical frequency comb generator can be controlled by a control servo based on an intensity of the optical signals after propagating in the optical resonator. Utilizing an optical frequency comb generator reduces the bias error during gyroscope operation.

Disclosed are optical communications systems and optical receivers including one or more optical cavity resonators. In particular, disclosed are methods and apparatus that allow for beam pointing to be maintained while permitting the receiver to tune the optical length of the optical resonator to suit the wavelength, data rate and modulation format of the incoming optical signal, without requiring a coherent receiver or adaptive optics in addition to optical resonators.

The present invention relates to a differential optoelectricalal converter that transforms an optical anbit into an electrical anbit. The convertor uses two beam splitters (31, 32) that receive optical signals from the anbit, each one splitting the signal into two beams; a beam combiner (4) that combines a beam that exits each beam splitter; and three photodiodes (51, 52, 53) connected to a beam that exits each beam splitter and to the output of the beam combiner, each photodiode generating a photocurrent, the photocurrents being processed by a signal processing module (6) to obtain the electrical anbit (200). The invention provides an efficient solution for analog computation designed to harness the benefits of PIP technology and establish a bridge between integrated photonics and integrated electronic by means of optoelectrical conversion.

A current-assisted photonic demodulator includes a detection portion having two doped modulation regions and two doped collection regions, lying flush with a first face covered by a dielectric layer. Electrodes pass through the dielectric layer and come into contact with the doped regions. In addition, intermediate electrodes partly pass through the dielectric layer and are spaced apart from the first face by a non-zero distance, each being located, in projection in a main plane, between one of the doped modulation regions and the adjacent doped collection region.

A sub-terahertz wave output device (1) comprises: an optical comb generation unit (2) that generates an optical comb; a first laser beam output unit (4) that outputs a first laser beam having a variable optical frequency; a first laser beam frequency control unit (10); a second laser beam output unit (6) that outputs a second laser beam having a variable optical frequency; a second laser beam frequency control unit (20); and an electrical signal output unit (8). The first laser beam frequency control unit (10) controls the optical frequency of the first laser beam such that the optical frequency of the first laser beam differs from the optical frequency in a first mode of the optical comb by a first difference frequency. The second laser beam frequency control unit (20) controls the optical frequency of the second laser beam such that the optical frequency of the second laser beam differs from the optical frequency in a second mode of the optical comb by a second difference frequency. The electrical signal output unit (8) receives the first laser beam and the second laser beam and outputs an electrical signal having a frequency that is the difference between the optical frequency of the first laser beam and the optical frequency of the second laser beam.

A quantum frequency converter includes a ferromagnetic topological insulator film having a first surface, a magnetic field application region where a magnetic field including a component perpendicular to the first surface is applied to the ferromagnetic topological insulator film, and a microwave transceiver configured to transmit and receive microwaves to and from the ferromagnetic topological insulator film, and the first surface of the ferromagnetic topological insulator film is irradiated with laser light. The quantum frequency converter can be used in quantum computers.

By inputting a modulation signal from a synthesizer circuit 11 to a switching circuit 13 via isolator elements 12A, 12B by inserting the isolator elements 12A, 12B between the synthesizer circuit 11 and the switching circuit 13, an operation of the synthesizer circuit 11 is prevented from being unstable with a load fluctuation by an opening or a short-circuit of circuits after the switching circuit, so an operation of the synthesizer circuit 11 will not be unstable by a load fluctuation when switching driving signals supplied to optical comb generators 14A, 14B by the switching circuit 13, and a driving state is transited by switching the driving signals of the optical comb generators 14A, 14B rapidly.