Abstract: Provided are: a photon detection light-receiving device with which it is possible to avoid malfunctions caused by the application of high voltages, and to shorten the delays in communication time in mesh-type network communication; and a communication apparatus equipped with the photon detection light-receiving device. The photon detection light-receiving device has a photon detection APD, a quenching resistor and a capacitor, with one end of the quenching resistor and one end of the capacitor being connected to one terminal of the photon detection APD.

Abstract: An optical scanner comprises a light transmitter for transmitting a light beam; a beam deflection unit that is configured to deflect the transmitted light beam in a periodically varying manner with a predefined period duration in order to scan a detection zone; a light receiver for receiving reflected light; and an electronic control device for controlling the beam deflection unit. The electronic control device is configured to automatically increase or decrease the period duration by a difference amount with respect to a nominal value before or during the operation of the optical scanner in order to counteract crosstalk between the optical scanner and a further optical scanner.

Abstract: An optical detection circuit includes: a first optical detection element having a first anode and a first cathode, the first optical detection element being configured to generate voltage between the first anode and the first cathode due to photoelectromotive force generated in accordance with incident-light quantity; and a first operational amplifier having a first non-inverting input terminal, a first inverting input terminal, and a first output terminal, in which the first non-inverting input terminal is connected to fixed potential, one of the first anode and the first cathode is connected to the first inverting input terminal, and the other of the first anode and the first cathode is connected to the first output terminal.

Abstract: A system for generating clock signals for a photonic quantum computing system includes a pump photon source configured to generate a plurality of pump photon pulses at a first repetition rate, a waveguide optically coupled to the pump photon source, and a photon-pair source optically coupled to the first waveguide. The system also includes a photodetector optically coupled to the photon-pair source and configured to generate a plurality of electrical pulses in response to detection of at least a portion of the plurality of pump photon pulses at the first repetition rate and a clock generator coupled to the photodetector and configured to convert the plurality of electrical pulses into a plurality of clock signals at the first repetition rate.

Abstract: Photoelectric conversion apparatus includes semiconductor layer having photoelectric converters in light-receiving region and photoelectric converters in light-shielded region, light-shielding part arranged above the semiconductor layer in the light-receiving region to surround light paths of the photoelectric converters in the light-receiving region, and light-shielding film arranged above the semiconductor layer in the light-shielded region to cover the photoelectric converters in the light-shielded region. The light-shielding part includes lower and upper ends. The light-shielding film includes lower and upper surfaces. Distance between the upper end and the semiconductor layer is larger than that between the upper surface and the semiconductor layer. Distance between the lower end and the semiconductor layer is smaller than that between the upper surface and the semiconductor layer and is larger than that between the lower surface and the semiconductor layer.

Abstract: An electron tube includes a photoelectric surface, an avalanche photodiode, a focusing electrode part that accelerates and focuses the electrons E from the photoelectric surface toward the avalanche photodiode, and a casing including a stem provided with the avalanche photodiode. The stem is provided with a light incident hole through which the light is transmitted, and the periphery of the light incident hole is light-shielded by the stem. The focusing electrode part includes a first region provided with a light passage hole, and a second region provided with an electron passage hole that guides the electrons to the avalanche photodiode. The first region is formed on an axial line that connects the light incident hole and the photoelectric surface. The second region is formed on an axial line that connects the photoelectric surface and the avalanche photodiode.

Abstract: The disclosure provides a small photoelectric sensor that can secure a capacity for accommodating optical components and secure sealing properties. The small photoelectric sensor includes a holder in which an opening, an edge that defines the opening, and four fixing parts that are independently provided at four corners of a front surface are formed on the front surface; a cover lens that is provided at a position interposed between the four fixing parts, and is connected to the edge in a region overlapping the edge; and an optical component that is held by the holder and projects or receives light through the opening.

Abstract: An optical module includes a fixed substrate, and a sensor substrate secured to the fixed substrate and having a through-hole formed therein. A light emitting device is secured to the fixed substrate at a position in the through-hole. A light receiving device is provided in the sensor substrate. A dummy light receiving device is formed between the light receiving device and the through-hole, around the through-hole, and in the sensor substrate. The light receiving device and the dummy light receiving device are made of an impurity diffusion layer having a same conductive type as a conductive type of a surface layer of the sensor substrate. The dummy light receiving device is deeper than the light receiving device.

Abstract: An optical encoder includes an encoding disk and an optical detector disposed to correspond to the encoding disk. The optical detector includes a plurality of optical sensors arranged to form an optical sensor array. The optical detector is provided to receive light. The optical detector includes at least one optical sensor arranged to form at least one sensor array. The width of the sensor array corresponds to an interpolation period of the optical encoder.

Abstract: An optical keyswitch includes a keycap, a supporting mechanism having a protrusion disposed under the keycap to support the keycap to move downward or upward, and a switch module including a circuit board, an emitter, and a receiver. The emitter and the receiver are electrically connected to the circuit board. The emitter emits an optical signal to the receiver. When the keycap is not pressed, the receiver receives the optical signal of a first intensity. When the keycap is pressed, the protrusion moves along with the keycap, and the protrusion changes the optical signal received by the receiver to have a second intensity different from the first intensity, so the switch module is triggered to generate a triggering signal.

Abstract: A light sensor includes a fixer tube, a sensor component, and holder. The sensor component is disposed at a bottom terminal of the fixer tube and fixed to the fixer tube. The sensor component senses incident lights. The holder is movably coupled to the fixer tube. The holder encompasses the sensor component. The holder further includes a first opening. The sensor component faces the first opening for receiving incident lights passing through the first opening. The holder further moves along an axis of the fixer tube for adjusting an incident light angle of the sensor component.

Abstract: A photodetection circuit includes a single photon avalanche diode (SPAD), and an active quenching circuit coupling the SPAD to an intermediate node and having a variable RC constant. The variable RC constant provides a first RC constant during an idle state so that when the SPAD detects a photon, the SPAD avalanches to begin quenching to set a magnitude of a voltage at a terminal of the SPAD to a quench voltage, the quench voltage being greater than a threshold voltage; a second RC constant greater than the first RC constant during a hold off period during which the quenching occurs so as to maintain the voltage at the terminal of the SPAD at a magnitude that is above the threshold voltage during the hold off period; and a third RC constant less than the second RC constant but greater than the first RC constant during a recharge period during which the SPAD is recharged.

Abstract: A light receiving element includes a silicon substrate, a photodiode, an amplifier circuit adapted to amplify an output signal from the photodiode, and a light blocking section adapted to cover at least a part of the amplifier circuit to block light, and the photodiode, the amplifier circuit and the light blocking section are provided to the silicon substrate.

Abstract: A photoelectric conversion element according to an embodiment of the disclosure includes a first electrode and a second electrode that are disposed to face each other and a photoelectric conversion layer that is provided between the first electrode and the second electrode, and contains at least a subphthalocyanine or a subphthalocyanine derivative, and a carrier dopant, in which the carrier dopant has a concentration of less than 1% by volume ratio to the subphthalocyanine or the subphthalocyanine derivative.

Abstract: Position-sensitive light beam detector comprising photodiodes and at least two weighting networks, each of which includes a signal output and network nodes. According to the invention, a plurality of the network nodes of the first weighting network is provided for the photodiode terminal in such a way that each node of said plurality of nodes is connected to a node of the second weighting network via a photodiode.

Abstract: Systems for detecting light (e.g., in a flow stream) are described. Light detection systems according to embodiments include a photodetector, an input modulator configured to modulate signal input into the photodetector and an output modulator configured to modulate signal output from the photodetector. Photodetector arrays having a plurality of light detection systems, e.g., as described, are also provided. Methods for matching output signals from two or more photodetectors (e.g., a plurality of photomultiplier tubes in a photodetector array) are also described. Flow cytometer systems and methods for detecting light from a sample in a flow stream are provided. Aspects further include kits having two or more of the subject light detection systems.

Abstract: A method and system, in an optical receiver, includes receiving a first photocurrent from a first photodetector and a second photocurrent from a second photodetector; amplifying the first photocurrent with a first amplifier to provide a first output signal and the second photocurrent with a second amplifier to provide a second output signal; adjusting a frequency response of a first path the first photocurrent and a second path of the second photocurrent; and determining a difference between the adjusted first photocurrent and the adjusted second photocurrent.

Abstract: An IC integrated structure for an optical mouse of the invention comprises a bracket configured for being connected with a PCB, an LED wafer for emitting light, a main control IC wafer and an optical lens; wherein the LED wafer and the main control IC wafer are respectively mounted at two ends of a terminal surface inside a bracket frame, the LED wafer and the main control IC wafer are connected with the PCB by the bracket, and the optical lens is mounted above the LED wafer and the main control IC wafer; a light shield configured for shielding an external light source is arranged between the optical lens and the main control IC wafer, and a through hole configured for transmitting light is formed in the light shield.

Abstract: A light sensor with high linearity is provided. A photoelectric component converts light energy into a photocurrent to a first capacitor. An error amplifier has a first amplification input terminal and a second amplification input terminal, which are respectively connected to a reference voltage source and a first terminal of a first transistor. A first terminal of a second transistor is connected to the second amplification input terminal. A second terminal of the first transistor is connected to the first capacitor. An output terminal of the error amplifier is connected to a second terminal of the second transistor. A first comparator compares a voltage of the first capacitor with a lowest one of a modulated voltage and a reference voltage to generate a first comparing signal. A counter circuit performs counting according to the first comparing signal.

Abstract: An optical rain sensor for detecting rainfall on a transparent substrate, the optical rain sensor including a housing disposed on a surface of the transparent substrate, a plurality of photo elements disposed within the housing, each photo element capable of being selectively activated to emit light and deactivated to receive light, and a controller operatively connected to the plurality of photo elements and configured to alternatingly drive the plurality of photo elements between a first mode of operation and a second mode of operation, wherein, in the first mode of operation, at least a first photo element is activated and at least a second photo element is deactivated and, in the second mode of operation, at least the second photo element is activated and at least the first photo element is deactivated.