Abstract: The imaging device (10) includes an optical element (12) having each transparent substrate and a plurality of structures disposed on or in the transparent substrate in a plane direction of the transparent substrate, an imaging element (11) in which a plurality of pixels including a photoelectric conversion elements are disposed, and a signal processing unit (13) configured to generate an image signal based on an electrical signal acquired from the imaging element (11), wherein the optical element (12) forms an image in which a point spread function of each wavelength is convoluted on a plurality of pixels corresponding to each polarized light component depending on polarized light components by outputting light in a state in which the optical element has different point spread functions for respective wavelengths, the plurality of structures have the same height in a side view, and the signal processing unit (13) reconstructs an image in which a point spread function of each wavelength is convoluted for each

Abstract: Provided is a highly-sensitive image-capture element and an image capture device that can be simply manufactured, have little polarization dependency, and have micro-spectroscopic elements capable of separating incident light into three wavelength ranges integrated facing a pixel array. An image capture element has a transparent layer having a low refractive index made of SiO2 or the like and a plurality of micro-lenses laminated on a pixel array in which pixels each including a photoelectric conversion element are disposed in an array. Inside the transparent layer having the low refractive index, micro-spectroscopic elements composed of a plurality of microstructures having constant thickness (length in a direction perpendicular to the pixel array) formed of a material such as SiN having a higher refractive index than that of the transparent layer is embedded.

Abstract: An imaging device includes an optical element including a transparent substrate and a plurality of structures disposed on or in the transparent substrate in a plane direction of the transparent substrate, an imaging sensor in which a plurality of pixels each including a photoelectric conversion element are arranged, and a signal processing unit configured to generate an image signal based on an electric signal obtained from the imaging sensor, wherein the optical element outputs light with a different point spread function for each wavelength to form, on the imaging sensor, an image in which the point spread function of each wavelength is convoluted, the plurality of structures have the same height in a side view, and the signal processing unit reconstructs an image in which the point spread function of each wavelength is convoluted.

Abstract: A new DC network structure is proposed that addresses various limitations of ASIC switches. In an optical network of the present disclosure, a slight time domain limitation is introduced for transmission from a network node to a same destination node. Data transmission and reception operate in a time slot scheme. A switching bandwidth in the ASIC switch has a bandwidth corresponding to average incoming traffic of a plurality of nodes, and includes a storage medium that stores and processes traffic exceeding the bandwidth. An average bandwidth for the reception ASIC switch can also be set to a bandwidth in which the maximum incoming bandwidth to the node is reduced by a coefficient F. Limiting the bandwidth of the reception ASIC switch can reduce the power consumption of the node, which is beneficial for network scalability.

Abstract: According to an embodiment, a cooling device for cooling a constituent element housed in a housing of a unit subjected to an influence of a generated magnetic field includes a water cooling mechanism and at least one air cooling mechanism. The water cooling mechanism cools the constituent element by cooling a cooling plate with a flow of water flowing through a pipe passing through the cooling plate arranged in the housing. The air cooling mechanism is arranged on an outgoing side where the flow of water flowing through the pipe is outgoing from the housing and cools the constituent element by discharging air in the housing along with the water flow in accordance with the water flow.

Abstract: Provided is an optical switch element capable of adjusting an output strength of light output from an optical switch to a fixed level.

Abstract: There is a manufacturing error even if an RGB coupler is appropriately designed, and thus a problem that it is difficult to achieve the function as designed with good yield arises. To solve this problem, an optical circuit with a first waveguide in which light in a zero-th order mode is guided and a second waveguide having a larger width than the first waveguide, in which light in a primary mode is guided in which the first and second waveguides at least include a first curved portion in a curve shape curved toward the first waveguide while maintaining a combination of waveguide widths satisfying mode conversion conditions is provided.

Abstract: To provide an optical multiplexing circuit that can accurately monitor light of a plurality of wavelengths, and that can tolerate degradation of LDs. An optical multiplexing circuit includes m sets of multiplexers configured to multiplex light output from n connection waveguides being a plurality of connection waveguides wherein a multiplexing unit configured to input and multiplex light output from the m sets of the multiplexers from m input waveguides, an output waveguide configured to output light multiplexed by the multiplexing unit, and n×m or m branching units being inserted into n×m connection waveguides of the plurality of connection waveguides or the m input waveguides are provided on a same substrate.

Abstract: Provided is a planar lightwave circuit in which stress on a substrate is reduced to decrease the curve of the substrate. The planar lightwave circuit is formed by layering a glass film on the substrate. When the optical axis direction from an input waveguide toward an output waveguide is in the longitudinal direction of the substrate, a plurality of grooves are formed in a line in the transverse direction of the substrate.

Abstract: An optical multiplexing circuit capable of accurately monitoring light of a plurality of wavelengths is provided.

Abstract: An optical element includes a transparent layer for covering a plurality of pixels each including a photoelectric conversion element, and a plurality of structure bodies arranged on the transparent layer or in the transparent layer in a plane direction of the transparent layer. The plurality of structure bodies is arranged in such a manner that, among incident light, first light having a wavelength in a near-infrared light region is condensed on a first pixel among the plurality of pixels, and light of a second color having a wavelength in a region outside the near-infrared light region is condensed on a second pixel.

Abstract: An imaging element includes a transparent layer for covering a plurality of pixels each including a photoelectric conversion element, and a plurality of structure bodies arranged on the transparent layer or in the transparent layer in a plane direction of the transparent layer, in which the plurality of structure bodies is arranged in such a manner that, among incident light, light of a first color is condensed on a first pixel located immediately below, and light of a second color is condensed on a second pixel located immediately below according to an incident angle of incident light of each of the structure bodies.

Abstract: An optical element includes a transparent layer for covering a plurality of pixels each including a photoelectric conversion element, and a plurality of structure members disposed on the transparent layer or in the transparent layer, the structure members being arranged in a plane direction of the transparent layer. The plurality of structure members is arranged to condense light of colors corresponding to respective pixels of the plurality of pixels into the corresponding pixels, the light of the colors being of incident light.

Abstract: An optical transmission and reception system includes an optical transmitter including an optical modulator that optically modulates a transmission signal containing a known signal inserted at predetermined intervals and transmits it to an optical transmission line, and an optical receiver including an optical RC circuit that converts an optical modulation signal received from the optical transmission line into a complex time series signal, a photoelectric conversion element that converts the complex time series signal into an electrical intensity signal, and a digital signal processing unit that performs learning using the known signal as a teaching signal and performs demodulation, based on learning results, using the electrical intensity signal received from the photoelectric conversion element.

Abstract: A mode multiplexing/demultiplexing optical circuit with a reduced inter-mode crosstalk is provided. A mode multiplexing/demultiplexing optical circuit includes a Port 1 through which light from a light source is input to a waveguide, a Port 3 through which light propagating through a first waveguide is output, a mode conversion unit located adjacent to the first waveguide, and configured to convert a first-order mode light input from the Port 3 to a second-order mode, and Port 2 configured to convert, via a waveguide located adjacent to the mode conversion unit, second-order mode light input to the mode conversion unit to a zeroth-order mode.

Abstract: An imaging element includes: a plurality of photoelectric conversion element groups each including a plurality of photoelectric conversion elements and being arranged in a two-dimensional direction; a transparent layer which faces the plurality of photoelectric conversion element groups and which extends in the two-dimensional direction as a planar direction; and a plurality of structure groups arranged in a planar direction of the transparent layer so as to correspond to the plurality of photoelectric conversion element groups on the transparent layer or inside the transparent layer, wherein each of the plurality of structure groups includes a plurality of structures arranged in a same pattern and is arranged so as to disperse incident light toward each of the photoelectric conversion elements of a corresponding photoelectric conversion element group, and in a plan view, relative positions of the corresponding photoelectric conversion element group and a structure group differ according to two-dimensional po

Abstract: An optical element includes a transparent layer which covers a pixel including a first photoelectric conversion element and a second photoelectric conversion element; and a plurality of structures disposed on the transparent layer or in the transparent layer in a plane direction of the transparent layer, in which the transparent layer includes a first region which guides incident light to the first photoelectric conversion element, and a second region which guides incident light to the second photoelectric conversion element, the plurality of structures are disposed in at least the second region among the first region and the second region, and the first region is smaller than the second region.

Abstract: An imaging element (100) includes: a pixel array (110) in which a plurality of pixels including photoelectric conversion elements are arranged in a two-dimensional array; and an optical element array (120) in which optical elements composed of a plurality of columnar structure bodies (160) arranged opposite to a pixel array (110) and guiding incident light to a corresponding photoelectric conversion element are arranged in a two-dimensional array, in which the plurality of columnar structure bodies (160) are formed in a width having a phase characteristic for guiding light to a photoelectric conversion element directly below a columnar structure body in accordance with an incident angle of the incident light of each columnar structure body (160) when viewed in a plan view and are formed at a same height when viewed in a side view.

Abstract: An imaging element (100) includes: a pixel array (110) in which a plurality of pixels including photoelectric conversion elements are arranged in a two-dimensional array; and an optical element array (120) in which optical elements composed of a plurality of columnar structure bodies (160) arranged opposite to a pixel array (110) and guiding incident light to a corresponding photoelectric conversion element are arranged in a two-dimensional array, in which the plurality of columnar structure bodies (160) are formed in a width having a phase characteristic for guiding light to a photoelectric conversion element directly below a columnar structure body in accordance with an incident angle of the incident light of each columnar structure body (160) when viewed in a plan view and are formed at a same height when viewed in a side view.

Abstract: There is provided an optical signal processing device capable of RC in a complex space using optical intensity and phase information. An optical modulator controlled by an electric signal processing circuit modulates laser light, which is emitted from a laser light source, at a modulation period either or both of the intensity and phase values of the optical electric field. On the other hand, an input signal is also modulated by the optical modulator at a modulation period in the time domain so as to be an input signal. The converted input signal passes through an optical transmission path and enters an optical circulation circuit via an optical coupler. Part of the circulating light is branched into two by an optical coupler, and the branched light is converted into a complex intermediate signal at a coherent optical receiver. This complex intermediate signal demodulated at the coherent optical receiver is computed at an electric signal processing circuit, and thereby the operation as RC can be performed.