207results 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).

The optical module provided by the invention comprises a circuit board and an optical modulation chip. The light modulation chip comprises a first substrate and a second substrate which are oppositely arranged. A light modulator is arranged on the surface of the first substrate and used for modulating light signals. And a second coupling waveguide is formed on one side of the light modulator and is used for transmitting the light to be modulated into the light modulator. A light demodulator is arranged on the surface of the second substrate and used for demodulating light signals. An end face coupler is formed on one side of the light demodulator and used for receiving the light to be modulated and continuously transmitting the light to be modulated. A first coupling waveguide is formed on the other side of the optical demodulator. According to the optical modulation chip, the first substrate and the second substrate are mixed and integrated, and the optical modulator and the optical demodulator are arranged on the surfaces of the first substrate and the second substrate respectively, so that the advantages of the two substrates are brought into full play, and the modulation and demodulation performance of an optical module is improved. Meanwhile, transmission of optical signals is achieved through the end face coupler, the first coupling waveguide and the second coupling waveguide.

Techniques for using one or more terahertz transceivers in wearable display glasses for bio-sensing are described. The one or more terahertz transceivers operate signals in Terahertz and configured as transmitters or receivers. When disposed collaboratively on a pair of display glasses, these transmitters or receivers allow THz signals to radiate certain locations of a human head and receive reflections thereof. The received signals may be used to detect / derive various bio conditions (e.g., brain condition).

The embodiment of the utility model provides a laser converter and a laser device. Wherein the laser converter comprises a shell, one side of the shell is provided with a laser input port, and the other side of the shell is provided with a laser output port; the nonlinear crystal is arranged in the shell and is used for converting the laser emitted from the laser input port into laser with a set wavelength; the first collecting lens is arranged in the shell and located on the side, away from the laser input port, of the nonlinear crystal, and the first collecting lens is used for focusing the laser with the set wavelength so that the laser output port can emit the focused laser. The laser converter can convert the laser, so that when the laser converter is applied to the laser device, the laser converter can be used for converting the laser originally emitted by the laser device, the laser originally emitted by the laser device is reserved, the laser device can emit the laser with the set wavelength by means of the laser converter, and the universality is good; and laser with set wavelength can be directly generated without adding a laser generator, so that the structure is simplified.

The invention relates to the technical field of devices for light modulation, and discloses a graphene all-optical modulator and application thereof. The graphene all-optical modulator comprises a thin silicon groove waveguide, a mode converter unit and a silicon dioxide substrate, and the thin silicon groove waveguide and the mode converter unit are located on the silicon dioxide substrate. The two sides of the thin silicon groove waveguide are respectively connected with a group of mode converter units, and the two groups of mode converter units are symmetrically distributed on the two sides of the thin silicon groove waveguide; and the thin silicon groove waveguide is covered with a graphene-hexagonal boron nitride heterojunction. Compared with the prior art, the all-optical modulator has the advantages that interaction between light and substances can be effectively enhanced, efficient all-optical modulation is achieved, meanwhile, the all-optical modulator has ultrafast response time and broadband modulation capacity, new possibility is provided for development of optical communication and optical information processing technologies, and the all-optical modulator is of great significance to development of ultrafast low-energy-consumption silicon-based optoelectronic chips.

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 invention relates to a current-assisted photonic demodulator 1, comprising a detection portion 10 having two doped modulation regions 11 and two doped collection regions 12, flush with a first face F1 covered by a dielectric layer 2. Electrodes M1, M2, C1, C2 pass through the dielectric layer 2 and come into contact with the doped regions 11, 12. In addition, intermediate electrodes I1, I2 partially pass through the dielectric layer 2 and are spaced from the first face F1 by a non-zero distance, each being located, in projection in a principal plane, between one of the doped modulation regions 11 and the adjacent doped collection region 12.

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.

A method for transmitting and receiving an electromagnetic radiation beam, adapted to determine an orbital angular momentum of the received electromagnetic radiation beam, is described. There is further described a system for transmitting and receiving an electromagnetic radiation beam, capable of performing the aforesaid method. A method for performing a telecommunication of signals modulated according to any modulation technique and grouped by means of orbital angular momentum multiplexing is further described There is further described a telecommunication system capable of performing the aforesaid method for performing a telecommunication of modulated signals.

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).

An apparatus embedded with one or more terahertz transceivers is described. The one or more terahertz transceivers based on at least Gunn diode are provided to facilitate wireless communication in the apparatus, where the apparatus is embedded with one or more planar antennas. The transceiver operates in terahertz and may be coupled to one or two different antennas, one for transmission and the other for reception.

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 device, comprising at least one monochromatic light source configured to generate a first optical trap; an ensemble of particles disposed in the first optical trap, each particle of the ensemble of particles being excitable to a first Rydberg state and a second Rydberg state, the second Rydberg state having a blockade radius, each particle of the ensemble of particles being within the blockade radius of each other and within the blockade radius of an atomic qubit, the atomic qubit being a particle that is excitable to the second Rydberg state, the ensemble of particles having a first transmissivity at a first wavelength when neither any particle of the ensemble of particles nor the atomic qubit is in the second Rydberg state, the ensemble of particles having a second transmissivity at the first wavelength when the atomic qubit is in the second Rydberg state, the second transmissivity being lower than the first transmissivity; and a second monochromatic light source configured to drive each particle of the ensemble of particles into the first Rydberg state; a probe light source configured to direct a probe beam having the first wavelength to the ensemble of particles; and a photosensor configured to determine the state of the atomic qubit.

A quantum transducer includes a back gate having a doped semiconductor layer, a tunnel barrier located above the doped semiconductor layer, a quantum dot contacting a top surface of the tunnel barrier, a cap layer located above the tunnel barrier and covering the quantum dot, a surface acoustic wave (SAW) resonator located above the cap layer, a SAW transducer coupled to the SAW resonator, and a top gate located above the SAW resonator. The SAW resonator is mechanically coupled to the quantum dot. The depth and electrical conductivity of the doped semiconductor layer may be selected such that SAW attenuation is not the dominant contributor to the total phonon loss rate of the SAW resonator. The depth and electrical conductivity may also be selected such that the SAW transducer has a piezoelectric coupling constant of 0.055% or higher.

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).

The present invention discloses a demodulation system and modulation method for high-speed fiber Bragg grating (FBG) monitoring. The demodulation system comprises two optical waveguides, one of which is equipped with a semiconductor optical amplifier (A) and a thermo-optical phase shifter, and the other with a semiconductor optical amplifier (B) and a double-helix waveguide. The ends of the two waveguides closest to the semiconductor optical amplifier are connected to a 1×2 optical coupler, which combines the optical beams and then couples them to a fiber Bragg grating (FBG) sensor via an external transmission unit. The outputs of the two waveguides are connected to an electro-optical Bragg deflection modulator (EOBDM), which is then connected to a photodiode. The electrical signal output by the photodiode is sequentially connected to a transimpedance amplifier, a data processor, and a network communication module. A signal reading unit is connected to the network communication module to read the output signal. This modulation system is stable and reliable, compact, low-power, and self-contained.

The present invention is in the field of a quantum wavelength converter between a microwave signal and an optical signal and vice versa. In the converter a nanoscale cavity optomechanical circuit is used in which optomechanical cavities supporting colocalized infrared photons and microwave phonons are combined with a photonic and a phononic waveguide.

A quantum light source device according to the present embodiment comprises: an optical fiber for transferring excitation light; a quantum light source to which the excitation light is provided to enable the quantum light source to provide a quantum signal to the optical fiber, the quantum light source being disposed at an end of the optical fiber; a thermally conductive material for coating the optical fiber; a cooling device connected to a metal rod to transfer heat to the rod; and a ferrule having one side into which the optical fiber is inserted and the other side into which the rod is inserted, wherein the heat transferred to the rod is transferred to the quantum light source through the thermally conductive material.

A system for noise-resistant quantum communication using hyperentanglement includes a quantum system that includes a plurality of qubits, a processor, and a memory. The memory includes instructions stored thereon, which, when executed by the processor, cause the quantum system to access a signal of a quantum system that includes a plurality of qubits and obtain hyperentanglement of the plurality of qubits via an entanglement source. The hyperentanglement of the plurality of qubits is in at least two dimensions, including a first dimension and a second dimension. The instructions, when executed, further cause the quantum system to transmit the hyperentangled plurality of qubits via a communication channel; perform a communication of the signal with the first dimension of the at least two dimensions; and filter results of the communicated signal based on the second dimension of the at least two dimensions.

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.

The present invention implements: 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 unit having a holding space having a height in the Z direction; a pressing step (S2) in which the powder precursor is pressed in the Z direction; and a temperature adjustment step for adjusting the temperature of the powder precursor by heating a first temperature, which is the temperature of the first end of the powder precursor, and a second temperature, which is the temperature of the second end of the powder precursor, to a temperature equal to or higher than the melting point of the organic light-emitting material, with the-X-side end of the powder precursor being a first end and the + X-side end being a second end, while maintaining the temperature difference between the first temperature and the second temperature. And the first temperature and the second temperature are gradually reduced to be lower than the freezing point of the organic light-emitting material.

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.

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.

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.