An apparatus includes a seed laser configured to generate a seed signal and a modulator configured to modulate the seed signal and generate multiple sideband signals. The apparatus also includes multiple injection-locked lasers configured to generate multiple optical signals based on different ones of the sideband signals. The apparatus further includes a combiner configured to combine the optical signals and generate a combined optical signal. In addition, the apparatus includes a feedback loop configured to modify frequencies of the sideband signals generated by the modulator so that the optical signals generated by the injection-locked lasers have a desired frequency difference. The feedback loop may be configured to perform photonic down-conversion of a portion of the combined optical signal prior to photodetection in order to decrease a frequency of a signal that undergoes photodetection.

An apparatus embedded with one or more terahertz transceivers is described. The one or more terahertz transceivers based on at least one resonant tunnelling diodes is provided to facilitate wireless communication in the apparatus, where the apparatus is embedded with one or more planar antennas. The transceiver operates in terahertz and may be coupled to one or two different antennas, one for transmission and the other for reception.

Techniques for applying one or more terahertz transceivers in wearable display glasses are described. The one or more terahertz transceivers operate signals in Terahertz. When used on a pair of display glasses, these transceivers allow the display glasses to communicate with other devices wirelessly, including receiving/transmitting image date.

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.

An RF signal transceiver comprising a mode-locked laser to output an optical signal having a plurality of phase-locked modes, an optical splitter to power split the optical signal into a transmitter optical signal and a receiver optical signal; a transmitter apparatus to receive the transmitter optical signal and comprising an optical filter to select two of the modes, an optical modulator to modulate a part of the transmitter optical signal to form at least one phase modulated optical signal, and a photodetector to heterodyne the phase modulated optical signal with one of the modes without a corresponding phase modulation to form an RF signal for transmission; and a receiver apparatus arranged to receive an RF signal and the receiver optical signal and comprising an optical modulator to modulate the receiver optical signal with the received RF signal; and an optical to electrical signal conversion apparatus to convert the modulated receiver optical signal into a corresponding electrical signal.

A radio-frequency photonic devices employs photon-phonon coupling for information transfer. The device includes a membrane in which a two-dimensionally periodic phononic crystal (PnC) structure is patterned. The device also includes at least a first optical waveguide embedded in the membrane. At least a first line-defect region interrupts the PnC structure. The first optical waveguide is embedded within the line-defect region.

Techniques for applying one or more terahertz transceivers in wearable display glasses are described. The one or more terahertz transceivers operate signals in Terahertz. When used on a pair of display glasses, these transceivers allow the display glasses to communicate with other devices wirelessly, including receiving/transmitting image date.

In an optical modulator directional measurement system embodiment, one or more modulation waves may be measured and directionally discriminated by measuring the modulations of one or more lightwaves. The optical modulator transmission function magnitude for a most phase-matched modulation may be substantially greater than that for other modulations. At sufficiently high modulation frequency, the most phase-matched modulation magnitude may be substantially greater than the other modulation magnitudes. Accordingly, a modulation wave may be distinctly measured by measuring the modulation of the most phase-matched lightwave.

Disclosed herein is a photomixer and method of manufacturing the photomixer which can fundamentally solve the existing restrictive factors of a PCA and a photomixer which are core parts of a conventional broadband terahertz spectroscopy system. The presented photomixer includes an active layer formed on a top surface of a substrate, the active layer being formed on an area on which light is incident, and a thermal conductive layer formed on the top surface of the substrate, the thermal conductive layer being formed on an area other than the area on which light is incident. The active layer is formed to have a mesa cross section, and the thermal conductive layer is regrown on an area other than the area on which light is incident using an MOCVD method, and has a flattened surface.

An apparatus embedded with one or more terahertz transceivers is described. The one or more terahertz transceivers based on at least Gunn diode are provided to facilitate wireless communication in the apparatus, where the apparatus is embedded with one or more planar antennas. The transceiver operates in terahertz and may be coupled to one or two different antennas, one for transmission and the other for reception.