89results 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 invention discloses a DP-MZM-based reconfigurable mixer with phase shift and image rejection functions, and belongs to the field of microwave photon signal processing. By adjusting an input radio frequency signal and a direct current bias voltage of the DP-MZM1, four different LO frequency doubling and mixing functions can be realized. By controlling the angle alpha between the polarization direction of the polarization analyzer and one axis of the modulator, the phase of the generated signal can be flexibly tuned in the range of 0-360 degrees. When combined with the optical frequency comb, the multi-channel multi-band frequency conversion system can be expanded into a multi-channel multi-band frequency conversion system with independent phase tuning capability by utilizing the channel switching and frequency slot selection functions of the wavelength selection switch, and parallel output of various frequency mixing results can be realized. By adjusting the phase difference between the two-channel output signals, I / Q mixing, double-balanced mixing and image rejection mixing can be configured. The scheme is not influenced by direct current bias drift, the system complexity is reduced, and the frequency conversion efficiency is improved.

The embodiment of the present disclosure provides an optical transceiver and a manufacturing method thereof. The manufacturing method comprises the following steps: providing a substrate, wherein the substrate comprises a substrate, a buried oxygen layer and a lithium niobate layer which are sequentially stacked; the substrate comprises a light modulation area and a light detection area; etching the lithium niobate layer located in the light modulation area to form a thin film lithium niobate waveguide; removing the lithium niobate layer and part of the buried oxygen layer located in the light detection area to form a groove; the bottom of the groove exposes the substrate; forming a light absorption layer in the groove; wherein the thin film lithium niobate waveguide is used for modulating an optical signal and outputting the modulated optical signal; and the light absorption layer is used for detecting the modulated optical signal and converting the modulated optical signal into an electrical signal.

A semiconductor light-receiving element (100) according to the present disclosure comprises: a substrate (1); a first mesa structure (30) having at least an n-type semiconductor layer (2, 3), a multiplication layer (4), a p-type electric field relaxation layer (5), a light absorption layer (6), and an i-type semiconductor layer (8) having a larger band gap than the light absorption layer (6), said layers being sequentially formed on the substrate (1); a second mesa structure (31) having at least a window layer (9) having a larger band gap than the light absorption layer (6), the second mesa structure (31) being formed on the first mesa structure (30); and a terrace part (40) comprising the outermost surface of the first mesa structure (30) exposed to the outer-peripheral side of the second mesa structure (31).

A system and method for transfer of signals between an inside of a cryogenic system and an external environment including at least one optical source (e.g., a laser) for generating optical input signals and at least one fibre for transferring modulated optical signals to the inside of the cryogenic system and receiving optical output signals from the inside of the cryogenic system. A plurality of detectors, located in the external environment, is used for detecting the optical output signals and are connected to the fibre. A plurality of first transducers converts the modulated optical signals to microwave input signals and a plurality of second transducers converts the microwave input signals to optical output signals. A first microwave impedance matching resonator is connected to the plurality of first transducers and a second microwave impedance matching resonator is connected to the plurality of second transducers.

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).

A device for color conversion is provided. The device comprises a Distributed Bragg Reflector (DBR) structure on a substrate and a metasurface comprising a plurality of nanostructures is disposed on the DBR. Each nanostructure includes a first dielectric layer with a first refractive index on a second dielectric layer with a second refractive index, the first refractive index being different from the second refractive index. An active medium comprising quantum dots is disposed in between the plurality of nanostructures. The geometric parameters of the plurality of nanostructures are controlled such that the cavity modes of different natures can be tailored to match the absorption spectra of the active medium. This enhances absorption of incident light and color-conversion efficiency.

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.

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.

To provide a multi-stage optical MIMO demultiplexer.SOLUTION: An optical polarization demultiplexer 200 is formed by: a polarization splitter and rotator (PBSR) 202; two 50 / 50 couplers 204 and 206; and two phase shifters 208 and 210. The two phase shifters 208 and 210 are controlled by another control signals Φ1212 and Φ2214. Each of the two phase shifters 208 and 210 is a differential phase shifter. The phase shifter 208 is mounted as an interferometer having two individual phase shift elements 208a and 208b that adjust an optical phase to one direction with one arm of an interferometer, and adjust an optical phase to an opposite direction with the other arm. The phase shifter 210 also has the same structure.SELECTED DRAWING: Figure 2

The invention relates to a current-assisted photonic demodulator (1) adapted for detecting light radiation, comprising: a detection portion (10), made of germanium, extending vertically between a rear face (Far) and a front face (Fav) parallel to a principal plane, the front face (Fav) being intended to receive the light radiation, comprising modulation regions (11) and collection regions (12); a dielectric layer (22), made of at least one electrically insulating material, extending over and in contact with the rear face (Far); at least one central electrode (EC), intended to be positively polarized, partially traversing the dielectric layer (22) and spaced from the rear face (Far) by a non-zero distance, located opposite the central region (Zc) and arranged, in projection onto the principal plane, between the modulation regions (11). Figure for the abstract: 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 device and the like capable of suppressing change in tapping rate even when the wavelength of signal light changes.SOLUTION: The optical device includes a first coupler, a second coupler, and a monitor part. The first coupler includes a first input port, a first bar port located to the first input port in a bar direction, and a first cross port located to the first input port in a crossing direction. Many pieces of signal light on a short wavelength side are tapped from the first input port to the first bar port. The second coupler includes a second input port, a second bar port located to the second input port in the bar direction, and a second cross port located to the second input port in the crossing direction. Many pieces of signal light on a long-wavelength side are tapped from the second input port to the second cross port. The monitor part is connected to the first bar port or the second cross port, and monitors signal light outputted from the first bar port or the second cross port.SELECTED DRAWING: Figure 1

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

The present invention aims to enable seamless connection between high-frequency wireless communication and optical communication. A wireless reception device according to the present invention is a device for receiving a wireless signal modulated with an information signal, including a reception antenna, an excitation laser that outputs laser light with a predetermined wavelength, a micro-optical resonator that is excited by the laser light and generates an optical frequency comb with a repetition frequency different from a carrier frequency of the wireless signal by a difference frequency, an optical bandpass filter that independently separates an arbitrary optical frequency mode and an adjacent optical frequency mode from the optical frequency comb consisting of optical frequency modes, the adjacent optical frequency mode being spaced apart from the arbitrary optical frequency mode by a repetition frequency, an optical circulator that optically amplifies the separated arbitrary and adjacent optical frequency modes by injection locking to a slave laser with a wavelength adjacent to the separated arbitrary and adjacent optical frequency modes, an electro-optic conversion element that is provided at a reception portion of the reception antenna and optically modulates the arbitrary optical frequency mode in accordance with the wireless signal, and an optical bandpass filter that separates the adjacent frequency mode and a modulated component of the arbitrary optical frequency mode adjacent thereto.

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).

Techniques for creating an SiGe / Si electro-optomechanical quantum transducer, comprising an SiGe / Si optical ring resonator and capacitor, that can be associated with a qubit are presented. The optical resonator, comprising an SiGe optical waveguide and a strained silicon membrane, can be formed and disposed over a substrate. The strained silicon membrane can have a photoelastic coupling with the SiGe optical waveguide. A capacitor, comprising a superconducting material, can be formed in proximity to the optical resonator. The top plate of the capacitor can be associated with the strained silicon membrane. A recessed region can be formed in the back side of the substrate along a desired silicon plane, extending to form a hole in the top side of the substrate. A superconducting material can be applied along substrate surfaces defining the recessed region and hole. The superconducting material covering the hole can be the bottom plate of the capacitor.

To provide a multi-stage optical MIMO demultiplexer.SOLUTION: An optical polarization demultiplexer 200 is formed by: a polarization splitter and rotator (PBSR) 202; two 50 / 50 couplers 204 and 206; and two phase shifters 208 and 210. The two phase shifters 208 and 210 are controlled by another control signals Φ1212 and Φ2214. Each of the two phase shifters 208 and 210 is a differential phase shifter. The phase shifter 208 is mounted as an interferometer having two individual phase shift elements 208a and 208b that adjust an optical phase to one direction with one arm of an interferometer, and adjust an optical phase to an opposite direction with the other arm. The phase shifter 210 also has the same structure.SELECTED DRAWING: Figure 2

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.