An optical detector includes a sensor device chip including a substrate and a sensor device that is provided at a front face side of the substrate and detects light entering from a back face side of the substrate. The sensor device chip has, at the back face side of the substrate, a region in which a refractive index varies so as to increase from a light incident face toward a thicknesswise direction.

An integrated quantum random noise source includes a substrate, an optical oscillator that may be integral to the substrate coupled by an optical waveguide to an optical directional coupler. The optical directional coupler has two outputs that are coupled by optical waveguides to a pair of photodetectors that are part of a balanced photodetector. The balanced photodetector in response outputs an analog signal proportional to the difference in photocurrents of the two photodetectors. The analog output signal from the balanced photodetector is a random Gaussian-distributed signal representative of quadrature measurements on the quantum vacuum state of light. The random noise source can be coupled other apparatus to provide a source of random bits.

A photoreceiver device includes a light detector connected between a power supply node and a first node, and first to third switching elements. The light detector is configured to detect an incident optical data signal, and to output photocurrent corresponding to a magnitude of the optical data signal through the first node. The first switching element is connected between the first node and a ground node. The second switching element is connected between the power supply node and a second node. The third switching element is connected between the second node and the ground node. The third switching element has a control node connected to the first node.

A photoreceiver device includes a light detector connected between a power supply node and a first node, and first to third switching elements. The light detector is configured to detect an incident optical data signal, and to output photocurrent corresponding to a magnitude of the optical data signal through the first node. The first switching element is connected between the first node and a ground node. The second switching element is connected between the power supply node and a second node. The third switching element is connected between the second node and the ground node. The third switching element has a control node connected to the first node.

A photoreceiver device includes a light detector connected between a power supply node and a first node, and first to third switching elements. The light detector is configured to detect an incident optical data signal, and to output photocurrent corresponding to a magnitude of the optical data signal through the first node. The first switching element is connected between the first node and a ground node. The second switching element is connected between the power supply node and a second node. The third switching element is connected between the second node and the ground node. The third switching element has a control node connected to the first node.

The present disclosure relates to an optical sensor module, an optical sensing accessory, and an optical sensing device. An optical sensor module comprises a light source, a photodetector, and a substrate. The light source is configured to convert electric power into radiant energy and emit light to an object surface. The photodetector is configured to receive the light from an object surface and convert radiant energy into electrical current or voltage. An optical sensing accessory and an optical sensing device comprise the optical sensor module and other electronic modules to have further applications.

The present disclosure relates to an optical sensor module, an optical sensing accessory, and an optical sensing device. An optical sensor module comprises a light source, a photodetector, and a substrate. The light source is configured to convert electric power into radiant energy and emit light to an object surface. The photodetector is configured to receive the light from an object surface and convert radiant energy into electrical current or voltage. An optical sensing accessory and an optical sensing device comprise the optical sensor module and other electronic modules to have further applications.

An electronic device may have a display with a cover layer. An ambient light sensor may be aligned with an ambient light sensor window formed from an opening in a masking layer on the cover layer in an inactive portion of the display. To help mask the ambient light sensor window from view, the ambient light sensor window may be provided with a black coating that matches the appearance of surrounding masking layer material while allowing light to reach the ambient light sensor. The black coating may be formed from a black physical vapor deposition thin-film inorganic layer with a high index of refraction. An antireflection layer formed from a stack of dielectric layers may be interposed between the black thin-film inorganic layer and the display cover layer.

The present disclosure relates to an optical sensor module, an optical sensing accessory, and an optical sensing device. An optical sensor module comprises a light source, a photodetector, and a substrate. The light source is configured to convert electric power into radiant energy and emit light to an object surface. The photodetector is configured to receive the light from an object surface and convert radiant energy into electrical current or voltage. An optical sensing accessory and an optical sensing device comprise the optical sensor module and other electronic modules to have further applications.

A system is provided for producing an output photon having a predefined frequency. A pump module produces a plurality of pump fields at a plurality of pump frequencies. A photon pair source module generates frequency-correlated photon pairs. A detector module generates a heralding signal subsequent to detecting a first photon of a photon pair, the heralding signal indicative of a frequency of the second photon of the pair. A non-linear photonic element is arranged to (1) receive the heralded second photon and a complementary selected pump field, and (2) to produce an output photon having the predefined frequency. A pump field selector is configured to (1) receive a heralding signal and (2) select, based on the received heralding signal, a pump field of the plurality of pump fields for provision to the non-linear element. Methods, controllers and computer-readable media are also described herein.