A method for demultiplexing and demodulating (in particular, locally demultiplexing and demodulating) amplitude-modulated signals grouped by means of orbital angular momentum multiplexing is described. The method involves demultiplexing and demodulating information a(t), b(t) modulated on each of a first modulated beam Fm1 and at least one second modulated beam Fm2, based on phase difference values ?P.sub.ab and ?R detected by beam detectors located downstream of an interferometric structure 40 to which two portions of the electromagnetic beam carrying the modulated channels are provided as inputs, multiplexed in the orbital angular momentum variable. There is also described a corresponding system 100 for demultiplexing and demodulating amplitude-modulated signals capable of implementing the aforesaid method.

A wavelength converter includes a first optical layer, a second optical layer, and a pixel array positioned between the first optical layer and the second optical layer. A pixel in the pixel array includes a first device to convert incident invisible light to an electrical signal and a second device that converts the electrical signal into visible light.

A method may include generating a laser light beam with a laser source, splitting the laser light beam into a first front side beam and a back side beam for a back side of an ion trap using a first beamsplitter, directing the front side beam to a second beamsplitter using an input telescope, and splitting the first front side beam into a plurality of second front side beams directed to a common acousto-optic medium using a second beamsplitter. The common acousto-optic medium may have a respective plurality of electrodes coupled to the common acousto-optic medium for each of the second front side beams. The method may further include directing the plurality of second front side beams to a front side of the ion trap using an output telescope, and generating a respective RF drive signal for each of the plurality of electrodes using a plurality of RF drivers.

A method may include generating a laser light beam with a laser source, splitting the laser light beam into a first front side beam and a back side beam for a back side of an ion trap using a first beamsplitter, directing the front side beam to a second beamsplitter using an input telescope, and splitting the first front side beam into a plurality of second front side beams directed to a common acousto-optic medium using a second beamsplitter. The common acousto-optic medium may have a respective plurality of electrodes coupled to the common acousto-optic medium for each of the second front side beams. The method may further include directing the plurality of second front side beams to a front side of the ion trap using an output telescope, and generating a respective RF drive signal for each of the plurality of electrodes using a plurality of RF drivers.

An opto-electronic integrated circuit includes an optical splitter (12, 13A, 13B) formed on a substrate, the optical splitter branching an input optical signal into N (N is an integer of 2 or more) optical signals, and outputting the optical signals, and N optical phase modulators (15A-15D) formed on the substrate for the respective optical signals output from the optical splitter, the optical phase modulators adjusting the phases of the optical signals based on a phase modulation characteristic in which the phase change amount changes depending on the wavelength of light, and output the optical signals.

A detector remodulator comprising a silicon on insulator (SOI) waveguide platform including: a detector coupled to a first input waveguide; a modulator coupled to a second input waveguide and an output waveguide; and an electrical circuit connecting the detector to the modulator; wherein the detector, modulator, second input waveguide and output waveguide are arranged within the same horizontal plane as one another; and wherein the modulator includes a modulation waveguide region at which a semiconductor junction is set horizontally across the waveguide.

An optical frequency comb device includes: an optical waveguide; a first mirror disposed at a first position in the optical waveguide; a second mirror disposed at a second position different from the first position, in the optical waveguide; a gain medium and a saturable absorber which are disposed between the first mirror and the second mirror; and a controller that fixes one of a repetition frequency and a carrier-envelope offset frequency of an optical frequency comb output from an end of the optical waveguide, and changes the other of the repetition frequency and the carrier-envelope offset frequency.

A system and method for transfer of signals between an inside of a cryogenic system and an external environment including at least one optical source (e.g., a laser) for generating optical input signals and at least one fibre for transferring modulated optical signals to the inside of the cryogenic system and receiving optical output signals from the inside of the cryogenic system. A plurality of detectors, located in the external environment, is used for detecting the optical output signals and are connected to the fibre. A plurality of first transducers converts the modulated optical signals to microwave input signals and a plurality of second transducers converts the microwave input signals to optical output signals. A first microwave impedance matching resonator is connected to the plurality of first transducers and a second microwave impedance matching resonator is connected to the plurality of second transducers.

The present invention realizes terahertz wireless transmission with low phase noise and high output. A coherent combining photoelectric conversion apparatus transmits, from a transmission antenna, a wireless signal obtained by modulating a carrier signal with a baseband signal including an information signal, and includes: a micro-optical resonator (2) that is excited by laser light and generates an optical frequency comb with a frequency interval f.sub.rep that is 100 GHz or more and 3 THz or less; a modulated signal generation unit (3) that separates a plurality of mutually adjacent optical frequency mode pairs from the optical frequency comb, and optically modulates one optical frequency mode of each pair using the same baseband signal; a photoelectric conversion element unit (4) that is provided in the transmission antenna and includes one or more photoelectric conversion elements that mix the optical frequency modes of each pair to generate a group of high-frequency electromagnetic wave signals having a frequency interval equal to the frequency interval f.sub.rep; and phase offset adjustment units (301, 302) that adjust a phase offset between the group of high-frequency electromagnetic wave signals.

In various aspects, a device for reversibly modulating electromagnetic radiation may be provided. The device may include a base substrate. The device may include a patterned metal layer disposed over the base substrate. The patterned metal layer may include a plurality of electrodes separated by a gap and at least one additional metal pattern separated from the plurality of electrodes. The gap may define an active area through which radiation is passed. The device may include an organic layer disposed over at least the plurality of electrodes, and base substrate, and within the gap. The organic layer may include a conducting polymer. The device may include an ion gel disposed over the conducting polymer, the patterned metal layer, and the base substrate. The device may be configured to allow ions from the ion gel layer to transport into the conducting polymer.