A THz waveguide is described, comprising four conductive wires separated by an air gap, the THz waveguide allowing low-loss and dispersion-free propagation of a THz signal. The system for terahertz polarization-division multiplexing comprises at least two THz sources, a THz waveguide and a THz receiver, wherein said THz waveguide comprises four conductive wires separated by an air gap; THz pulses from the THz sources being coupled into the THz waveguide; the THz waveguide transmitting the THz pulses independently, the THz waveguide operating as a broadband polarization-division multiplexer. The method for terahertz polarization-division multiplexing, comprising multiplexing THz pulses from terahertz sources in free-space, coupling resulting multiplexed THz pulses into a THz waveguide comprising four conductive wires separated by an air gap; and demultiplexing the multiplexed THz pulses after propagation in the waveguide.

A system for parallel photonic computation, preferably including a source module, a plurality of input modulator units, an optical interference unit (OIU), and a plurality of detector banks. An OIU, preferably including one or more unitary matrix modules and optionally including a diagonal matrix module. An input modulator, which can include one or more waveguides, couplers, and/or modulator banks. A method for parallel photonic computing, preferably including encoding input vectors, performing a desired matrix operation, and receiving output values, and optionally including performing electronic computations and/or performing further optical computations based on the outputs, which can function to compute the results of a matrix operation on many different input vectors in parallel.

The invention is related to devices that couple light into and out of concentric multicore fibers (MCFs). One embodiment of the invention is directed to a multiplexing/demultiplexing coupler, formed using at least two diffractive optical elements, so that light from one of the cores of the concentric MCF exits the coupler along a first axis and the light from another of the cores of the MCF exits coupler along another axis displaced form the first axis. In another embodiment, an add/drop filter includes at least one diffractive optical element, and directs light from one core of the concentric MCF to one fiber and light from one or more other cores of the concentric MCF to another fiber. In another embodiment, a mixing coupler transmits light from inner and outer cores of a first concentric MCF respectively to outer and inner cores of a second concentric MCF.

A wavelength division multiplexing structure includes: a first reflecting surface; a second reflecting surface; a first optical filter; a second optical filter; and a pretreatment device. The light that is incident on the first reflecting surface forms a first C-shaped light path in C-shaped or approximately C-shaped and enters the first optical filter. The light that is incident on the first reflecting surface forms a non-coplanar straight line with the light that is reflected by the second reflecting surface. The light that is incident on the pretreatment device forms a pretreatment light path, enters the first optical filter. The light in the pretreatment light path coincides with the light in the first C-shaped light path that is incident on the first optical filter from the second reflecting surface.

An optical fiber filter includes a fiber core, inner cladding, and outer cladding. A refractive index of the fiber core, a refractive index of the inner cladding, and a refractive index of the outer cladding progressively decrease in sequence. The fiber core is configured to transmit at least two mutually different first optical signal modes, the inner cladding is configured to transmit at least two mutually different second optical signal modes, and at least one fiber grating is etched on the fiber core. At least part of optical power of a target first optical signal mode is coupled to only a target second optical signal mode at the fiber grating. The target first optical signal mode is one of the at least two first optical signal modes, and the target second optical signal mode is one of the at least two second optical signal modes.

An optical module as disclosed includes an aligning bridge, an optical de-multiplexer and a lens array. The aligning bridge has a first section and a second section opposite to the first section. The optical de-multiplexer is on the first section of the aligning bridge. The optical de-multiplexer comprises a plurality of filters configured to transmit a plurality of light beams of different wavelengths. The lens array is on the second section of the aligning bridge. The lens array comprises a plurality of input ports aligned with the filters and configured to receive the light beams from the filters.

Methods, devices, and systems for processing information are disclosed. An example device may comprise a metastructure comprising a plurality of physical features configured to transform an analog signal according to a kernel of an integral equation. The device may comprise one or more waveguides coupled to the metastructure and configured to recursively supply a transformed analog output signal of the metastructure to an input of the metastructure to iteratively cause one or more transformed analog signals output from the metastructure to converge to an analog signal representing a solution to the integral equation.

An optical module includes an interface electrically connected to an external device to receive a data signal to be transmitted, a signal processor configured to perform serialization and signal modulation on the received data signal, an optical transceiver configured to generate an optical transmission signal by receiving a direct current (DC) light source, in which a plurality of light sources having different wavelengths are multiplexed, from an optical power supply and performing optical modulation thereon through the serialized and modulated data signal, and an optical fiber connector configured to output the generated optical transmission signal to the external device and receive an optical reception signal from the external device.

An apparatus may include one or more optical fibers, one or more optical waveguides, and multiple resonator nodes arranged in an array of sensing locations. Each resonator node may include an optical coupling between an optical waveguide and an optical fiber having a set of resonant frequencies at a respective sensing location. Each resonator node may be further configured to communicate a set of signals corresponding to at least one shift in the set of resonant frequencies in the optical fiber at the respective sensing location.

Photonic devices are disclosed including a first cladding layer, a first electrical contact comprising a first lead coupled to a first dielectric portion, a second electrical contact comprising a second lead coupled to a second dielectric portion, a waveguide structure comprising a slab layer comprising a first material, and a second cladding layer. The slab layer may be coupled to the first dielectric portion of the first electrical contact and the second dielectric portion of the second electrical contact. The first dielectric portion and the second dielectric portion may have a dielectric constant greater than a dielectric constant of the first material.