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JP2023092142A |
To enable a spatial resolution to be heightened.A light detection device according to the present disclosure comprises: a laser light source for emitting coherent laser light; two or more light detection units, each of which has light a ...
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JP7295460B2 |
The present invention provides an optical phase synchronization method characterized by involving applying a small phase modulation signal (dither signal) to local oscillator light, acquiring an error signal that is dependent on a phase ...
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JP2023524480A |
Distributed fiber sensing systems can use integrated coherent receivers. Integrated coherent receivers can include planar lightwave circuits that include various optical components.
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JP2023521427A |
A method of generating a millimeter wave optical signal in the present invention includes the steps of phase locking two frequency components of two optical pump sources, inputting said two frequency components into a fiber ring cavity, ...
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JP7277830B2 |
A balanced homodyne detection optical circuit according to the present disclosure is a planar optical waveguide circuit in which a circuit made of an optical waveguide including a dielectric or a semiconductor is formed on a substrate, t...
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JP7277832B2 |
An optical transmission system includes: a transmission unit configured to co-propagate a signal light in which data is modulated and an idler light having complex amplitude that is phase conjugate with the signal light via an optical tr...
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JP7260771B2 |
A transmission device includes: a first wavelength conversion circuit configured to convert a wavelength band of a wavelength multiplexed signal light based on a wavelength of a second excitation light by performing four-wave mixing on t...
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JP2023051812A |
To provide a multi-stage optical MIMO demultiplexer.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...
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JP7245522B2 |
An optical receiver (30) comprising an optical combiner (40) for combining an optical signal carrying data having a center frequency with local oscillator light having a local oscillator frequency into a combined optical signal. A local ...
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JP7239822B2 |
Provided is a polarization multiplexing optical transmitting and receiving circuit that compensates for transmission side PDL so as to suppress a reduction in transmission power and makes a branching ratio of light from a light source va...
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JP7238575B2 |
To provide a monitor receiver, a measuring method, and an optical 90° hybrid integrated circuit suitable for miniaturization while appropriately monitoring input light and output light.A monitor receiver 50 includes a splitter 51 that b...
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JP7227484B2 |
To provide an optical 90-degree hybrid formed of a silicon waveguide capable of suppressing an optical loss and a phase error, and facilitating electronic packaging and optical packaging. In the optical 90-degree hybrid circuit including...
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JP7227280B2 |
A phase-lock-free system includes a control instruction unit, a low-noise high-gain optical amplifier, an optical switch, a filter, an optical delay interferometer I, an optical delay interferometer Q, a first balanced detector, a second...
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JP7180866B2 |
To provide an optical heterodyne detector which can make a sensitive and reliable measurement, and a laser radar device using the optical heterodyne detector.The present invention includes: an image forming lens 20 for collecting a recep...
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JP7164013B2 |
An optical modulation method and device capable of stably generating an optical signal including a zero-intensity state among four states required for phase-time coding scheme by a nested modulator, is provided.A controller controls the ...
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JP7156472B2 |
To provide a light monitor circuit capable of controlling by monitoring the power of polarization multiplexed signal light using a single PD with a simple control circuit at low cost.The light monitor circuit has a polarization diversity...
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JP7156382B2 |
In order to provide an optical receiver capable of performing stable coherent detection and maintaining the quality of a received signal, this optical receiver is provided with: a local oscillation light output unit 301; a phase adjustme...
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JP2022137911A |
To provide a frequency sweep amount measuring device for an optical frequency comb that reduces its size and allows measurement of an amount of all comb mode frequency sweeps at low cost, and a frequency sweep amount measuring method for...
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JP7140784B2 |
Examples of a three-dimensional (3D) optical sensing system for a vehicle include a modular architecture. Light can be transmitted to an optical signal processing module, which can include a photonic integrated circuit (PIC) that can cre...
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JP2022128698A |
To highly accurately measure a distance while suppressing reduction of through-put in an optical distance meter.A measurement device comprises: a laser device for outputting frequency modulation laser light in a plurality of modes of a m...
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JP7110381B2 |
Optical receivers and methods for balanced signal detection using an optical resonator. An example of an optical receiver includes a polarizing beamsplitter that receives a free-space optical signal, a first detector positioned to receiv...
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JP7102518B2 |
An RF signal to be carried by an optical link is modulated onto two optical beams. The modulators are tuned differently so that the distortion products carried on one beam are relatively larger compared to the fundamental compared with o...
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JP7088472B2 |
To reduce unevenness in the light intensity of each polarized component attributable to a variable optical attenuator.An optical receiver comprises: a signal light input port for inputting signal light that includes two polarized compone...
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JP7088470B2 |
A method for adjusting an optical source used for fabricating an optical receiver comprising a signal beam input port, a polarization beam splitter, and signal generation units, is disclosed. The optical source generates a reference beam...
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JP2022090899A |
To provide a detection device and a detection method capable of detecting a deviation amount of an actual frequency difference with respect to a requested value of a frequency difference even in a case where the frequency difference whic...
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JP2022528207A |
Methods for demultiplexing and demodulating (especially "locally" demultiplexing and demodulating) amplitude-modulated signals grouped by orbital angular momentum multiplexing are described. This method is a phase difference value detect...
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JP2022528208A |
A method for transmitting and receiving an electromagnetic radiation beam adapted to determine the orbital angular momentum of the received electromagnetic radiation beam is described. A system for transmitting and receiving an electroma...
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JP7069428B2 |
An optical frequency control device (1) is configured to be provided with: a detection circuit (16) to receive first light including a first frequency from a first light source (11), receive second light including a second frequency from...
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JP7060474B2 |
To provide a technology for processing a polarization multiplexed modulation signal with a simple configuration.An optical modulator includes first modulation means for modulating the phase of continuous light of first polarization that ...
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JP7057506B2 |
A digital coherent receiver includes: an adaptive equalizer configured to execute, using a first tap coefficient, adaptive equalization processing on a digital signal that corresponds to a signal; a first coefficient updating unit config...
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JP7057500B2 |
A reception apparatus includes a dispersion compensation unit configured to acquire an electrical signal resulting from conversion of an optical signal and perform, on the electrical signal, dispersion compensation with a predetermined c...
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JP7049438B2 |
Generally discussed herein are systems, devices, and methods for providing a frequency stabilized optical frequency comb, including frequency stabilizing the optical frequency comb to a laser that is frequency stabilized to an optical re...
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JP7037958B2 |
A semiconductor integrated optical device includes: a supporting base including semi-insulating semiconductor; a first photoelectric convertor having first photodiode mesas; a second photoelectric convertor having second photodiode mesas...
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JP7009890B2 |
Embodiments of this disclosure provide a compensation apparatus for an offset drift, a received signal recovery apparatus and a receiver, in which estimation and compensation of an offset drift are directly performed at a receiver end, w...
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JP2022012983A |
To provide an optical signal processing apparatus and an optical signal processing method that can acquire a real part and an imaginary part of complex-amplitude of two polarization waves having orthogonal signal light, using a simple co...
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JP6985379B2 |
Optical signal receivers and methods are provided that include an optical resonator that allows an optical signal to enter and optical signal energy to accumulate at regions inside the optical resonator. A portion of optical signal energ...
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JP6983891B2 |
An optical receiver includes: means for outputting first combined light by combining local light of first polarization and signal light of second polarization that is orthogonal to the first polarization; means for converting the first c...
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JP6980185B2 |
To provide a calculation device for the Ising model that eliminates the need of phase synchronization of light in performing feedback input.A calculation device for the Ising model comprises: a phase sensitive amplifier 2 that artificial...
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JP6962028B2 |
To detect presence or absence of failures of an optical receiver with ease.An optical receiver comprises: a photoelectric conversion circuit that selects any one optical signal of reception light and test signal light obtained by modulat...
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JP6962357B2 |
A pluggable optical connector is configured to be insertable into and removable from an optical communication apparatus, and to be capable of communicating a modulation signal and a data signal with the optical communication apparatus. A...
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JP6961185B1 |
To position a control point at a position where an optical comb is most widely generated even when the method of generating an optical comb is not a complete single mode or even an optical comb generator whose modulation frequency can be...
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JP6949333B2 |
To provide an optical interference circuit with little variation in effective optical path length.The optical interference circuit composed using waveguide on a substrate, includes: a multi-branch coupler that branches a beam of light fr...
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JP6949335B2 |
To provide an optical interference circuit with little variation in effective optical path length.The optical interference circuit composed using waveguides on a substrate, includes: a tap coupler for branching a beam of light from a rep...
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JP6949334B2 |
To provide an optical interference circuit with little variation in effective optical path length.The optical interference circuit composed using waveguides on a substrate, includes: a branch coupler for branching a beam of light from a ...
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JP6925259B2 |
Methods of decoding N superimposed coherent optical transmission modes transmitted along a multimode optical fiber are provided where the optical signal detector comprises coherent detection hardware and a digital signal processor. The o...
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JP6922501B2 |
A coherent optical receiver module is disclosed. The module includes a housing, an optical fiber group, a first optical element, and a second optical element. The housing stores a first optical component disposed on an optical path of a ...
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JP6913829B2 |
Optical signal receivers and methods are provided that include an optical resonator that allows optical signal energy of multiple wavelengths to enter and accumulate inside the optical resonator. A portion of optical signal energy of eac...
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JP2021517775A |
An optical resonator is used as an optical receiver and method for detecting a balanced signal. In one example, an optical receiver is an optical resonator that receives an optical signal, stores resonant optical signal energy, and emits...
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JP6899562B2 |
To achieve an optical interference circuit with less variation in effective optical path length.An optical interference circuit configured using a waveguide on a substrate, includes: a branch coupler for branching light from a reproducti...
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JP6897359B2 |
To minimally suppress changes in frequency characteristics in response to environmental changes.An optical receiving apparatus includes a local light source 2, a dual polarization optical hybrid circuit 10a for mixing an input optical si...
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