To improve the optical power supply efficiency, a power-over-fiber system includes a power sourcing equipment including a semiconductor laser that oscillates with electric power to output feed light, a powered device including a photoelectric conversion element that converts the feed light into electric power, a plurality of optical fiber cables that transmit the feed light, a measurer that measures a distance from the power sourcing equipment to the powered device, and a control device that controls the power sourcing equipment to output the feed light after compensating for an amount of attenuation of the feed light according to a transmission distance on the basis of the distance from the power sourcing equipment to the powered device measured by the measurer.

A device includes a photonic routing structure including a silicon waveguide, photonic devices, and a grating coupler, wherein the silicon waveguide is optically coupled to the photonic devices and to the grating coupler; an interconnect structure on the photonic routing structure, wherein the grating coupler is configured to optically couple to an external optical fiber disposed over the interconnect structure; and computing sites on the interconnect structure, wherein each computing site includes an electronic die bonded to the interconnect structure, wherein each electronic die of the computing sites is electrically connected to a corresponding photonic device of the photonic devices.

A photoelectric adapter includes a power sourcing equipment (PSE) device, an optical connector connection part and an electrical connector. The electrical connector is connectable to an electrical connector connection part of an electrical device. The PSE device includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The PSE device is driven by receiving the electric power supplied from the electrical device through the electrical connector, and outputs the feed light from the optical connector connection part. Another photoelectric adapter includes a powered device, an optical connector connection part and an electrical connector. The powered device includes a photoelectric conversion element that converts feed light into electric power. The powered device receives the feed light supplied through the optical connector connection part, converts the feed light into the electric power, and outputs the electric power from the electrical connector.

A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable, a measurer and a control device. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The measurer measures a distance from the power sourcing equipment to the powered device. The control device controls the power sourcing equipment to output the feed light by changing a laser wavelength thereof for the distance from the power sourcing equipment to the powered device measured by the measurer.

A power sourcing equipment includes a laser oscillator and a modulator. The laser oscillator converts electric power into feed light. The modulator modulates, based on transmission information, a phase of the feed light output from the laser oscillator. The feed light phase-modulated by the modulator is output to outside of the power sourcing equipment. A powered device includes a photoelectric conversion element and a demodulator. The photoelectric conversion element converts feed light input from outside of the powered device into electric power. The demodulator detects a phase of the feed light to restore transmission information.

A cryogenic system cools and operates cryogenic electronics. The cryogenic system includes a cryogenic stage or multiple cryogenic stages for cooling the cryogenic electronics to an operational cryogenic temperature. The cryogenic stage or stages transfer heat from the cryogenic electronics to an ambient environment. An optical fiber or multiple optical fibers deliver an operational power from the ambient environment to the cryogenic electronics and transfer communication data between the cryogenic electronics and the ambient environment. Preferably, the only connection delivering any power from the ambient environment to the cryogenic electronics or transferring any data from the cryogenic electronics to the ambient environment is the optical fiber or fibers, such that the cryogenic system does not include any electrically conductive wires spanning between the ambient environment and the cryogenic electronics.

Methods and systems for safely and effectively supplying a beam of wireless power from a transmitter to at least one receiver. A delta signal is generated by repeatedly calculating the difference in power between the power of the beam emitted by the transmitter and the amount of power received at the receiver. The system dynamically generates a time delay, which is a time period shorter than the maximal exposure duration relating to safe exposure durations for the power level of the delta signal. If the time delay is exceeded, the system changes an operational parameter of the system, such as terminating the beam. Because of limitations to building a perfect timing system, the system is built to be more sensitive to time delays having longer safe exposure durations, with large delta signals having short safe exposure durations being responded to immediately and without significant regard to the time delay.

A wireless power transmission system for a robotic surgical system includes features for optical data transmission. A first component of the surgical system includes a control element, a power transmission element and an optical data transmission element; and a second component of the surgical system including a wireless power receiving element and an optical data receiving element, the second component is removably mountable to the first component. In some embodiments, a barrier such as a surgical drape and/or hermetic enclosure is positioned between the first and second components. In one example, of the components is a robotic manipulator arm and another is a powered instrument removably mountable to the manipulator arm.

Embodiments are directed to a rotor system for an aircraft comprising a gearbox configured to receive torque from a drive train, a mast having a first end and a second end, wherein the first end is attached to the gearbox and the mast configured to rotate in response to the torque from the drive train, a rotor hub attached to the second end of the mast, a first light transceiver mounted adjacent to the first end of the mast, wherein the first light transceiver is does not rotate relative to the mast, and a second light transceiver mounted adjacent to the second end of the mast, wherein the second light transceiver rotates with the mast.

A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable, a power storage and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The power storage stores the electric power. The controller performs a process of lowering an output level of the feed light in response to a value related to an electric power amount of the electric power stored in the power storage being equal to or higher than a predetermined threshold value, and performs a process of raising the output level in response to the value being lower than the predetermined threshold value.