Abstract: An optical chip structure is adapted for coupling an optical fiber array. The optical fiber array includes optical fibers arranged side by side. The optical chip structure includes an optical fiber coupling substrate, optical fiber accommodation grooves, and stoppers. The optical fiber accommodating grooves are adapted to accommodate the optical fiber array. The optical fiber accommodating grooves extend along a first axis and are arranged side by side in the optical fiber coupling substrate along a second axis. The first axis is perpendicular to the second axis. The optical fiber accommodating grooves respectively include first ends and second ends opposite to each other. The first ends are located at an edge of the optical chip structure. The stoppers are located in the optical fiber coupling substrate and are respectively located at the second ends.

Abstract: A Y-branch type optical coupler includes an optical coupling part to which a plurality of input-side optical waveguides through which the plurality of lights propagate, and one output-side optical waveguide are connected, wherein the optical coupling part has an isosceles trapezoid shape of which the width is narrowed in a taper shape at a first angle ? from the input side to the output side (a traveling direction of light) in a plan view, at least two input-side optical waveguides among the plurality of input-side optical waveguides are disposed symmetrically with respect to a symmetry axis of the isosceles trapezoid, are inclined at a second angle ? that is different from the first angle ?, and are connected to a lower bottom portion of the isosceles trapezoid, and the difference between the first angle and the second angle is 0.9° or more and 14.8° or less.

Abstract: Photonic coupling mechanisms are described. In one example, an evanescent coupler includes a substrate, first and second optical waveguides formed on the substrate, and a photonic wirebond having first and second end regions coupled to the first and second optical waveguides, respectively and a loopback portion extending between the first and second end regions, the photonic wirebond extending away from the first optical waveguide by an extension length.

Abstract: An all-photonic computational accelerator encodes information in the amplitudes of frequency modes stored in a ring resonator. Nonlinear optical processes enable interaction among these modes. Both the matrix multiplication and element-wise activation functions on these modes (the artificial neurons) occur through coherent processes, enabling the representation of negative and complex numbers without digital electronics. This accelerator has a lower hardware footprint than electronic and optical accelerators, as the matrix multiplication happens in a single multimode resonator on chip. Our architecture provides a unitary, reversible mode of computation, enabling on-chip analog Hamiltonian-echo backpropagation for gradient descent and other self-learning tasks. Moreover, the computational speed increases with the power of the pumps to arbitrarily high rates, as long as the circuitry can sustain the higher optical power.

Abstract: Improved training of optical neural networks is provided. In one example: 1) we choose input and target vectors, we program those into an input vector generator and a measurement unit, respectively, we turn on the optical input source power, and we monitor the electrical signal representing the cost function. 2) we can then modulate two or more controllable elements inside the optical network at different frequencies and look for the size and sign of the corresponding distinct AC variations in the measured cost function, simultaneously giving us the gradients with respect to each element.

Abstract: A radiation source including: a hollow core optical fiber having a body having a hollow core for confining a working medium, the hollow core optical fiber being operable to receive pulsed pump radiation such that the received pulsed pump radiation propagates through the hollow core from an input end to an output end of the hollow core optical fiber, wherein one or more source parameters of the radiation source are configured such that the pulsed pump radiation undergoes a soliton self-compression process so as to change a spectrum of the pulsed pump radiation to form output radiation; and at least one dispersion control mechanism being operable to change dispersion characteristics in a first portion of the optical fiber so as to spectrally shift a dispersive wave generated in the soliton self-compression process.

Abstract: Provided is an infrared modulator including a silicon substrate, a multiple buffer layer on the silicon substrate, the multiple buffer layer including indium phosphide (InP), a first type semiconductor layer on the multiple buffer layer, the first type semiconductor layer including InP, a light absorption layer on the first type semiconductor layer, the light absorption layer including a quantum well structure including indium gallium arsenic phosphide (InGaAsP), and a second type semiconductor layer on the light absorption layer, the second type semiconductor layer including InP.

Abstract: Embodiments are disclosed for providing a dual-facet distributed feedback (DFB) laser in a Mach-Zehnder modulator (MZM) structure. An example system includes an MZM structure that includes a DFB laser, a first waveguide interferometer arm structure, and a second waveguide interferometer arm structure. The DFB laser is configured to generate an optical input signal where the DFB laser includes a first output facet and a second output facet. The first waveguide interferometer arm structure is coupled to the first output facet of the DFB laser, and the first output facet of the DFB laser emits the optical input signal to the first waveguide interferometer arm structure. The second waveguide interferometer arm structure is coupled to the second output facet of the DFB laser, and the second output facet of the DFB laser emits the optical input signal to the second waveguide interferometer arm structure.

Abstract: An electro-optic modulator is disposed on a surface of a substrate including: an optical waveguide layer disposed on the substrate, a modulation electrode disposed on the optical waveguide layer, and a metal electrode disposed on the modulation electrode and electrically connected to the modulation electrode. A first end of the metal electrode is coupled to a radio frequency driver, and receives a modulation signal input by the radio frequency driver. The modulation electrode is configured to perform electro-optic modulation on the optical waveguide layer based on the modulation signal. A second end of the metal electrode is coupled to a direct-current voltage end, and the direct-current voltage end is configured to input a voltage signal and provide a bias voltage for the radio frequency driver by using the metal electrode. This reduces costs and a size of the electro-optic modulator, and is conducive to device miniaturization.

Abstract: An electronic device and associated methods are disclosed. In one example, the electronic device includes a photonic die and at least one optical fiber. Devices and methods are shown that include an optical coupler and one or more correction regions to align a beam between the photonic die and the optical fiber.

Abstract: An optical waveguide mounted substrate includes an interconnect substrate having a recess that opens on a first surface thereof, and an optical waveguide device including: an optical waveguide substrate including a support and a core layer disposed on the support; and a silicon photonic chip including a silicon substrate and a silicon waveguide disposed on the silicon substrate, the silicon waveguide being optically coupled with the core layer, wherein the optical waveguide substrate is mounted on the interconnect substrate such that the core layer faces away from the recess and at least a part of a thickness of the support is situated inside the recess.

Abstract: In one aspect, an integrated photonic device is disclosed, which comprises a waveguide through which radiation having one or more wavelengths within a wavelength band can propagate, a phase shifter optically coupled to said waveguide. The phase shifter comprises a heat-actuable phase change material (PCM) optically coupled to the waveguide, and a heater having a layer of a two-dimensional material in thermal communication with the PCM and configured to receive a reset voltage pulse for causing heating of the graphene layer followed by cooling thereof, wherein the thermal communication between the heated graphene layer and the PCM causes at least a portion of the PCM to undergo a phase transition from a crystalline state to an amorphous state, thereby causing a change in a refractive index of the PCM and a resultant phase shift in the radiation propagating through the waveguide.

Abstract: A fiber-optic cable includes an optical fiber that transports a forward-propagating laser beam. The optical fiber includes a core, a cladding, and an output end-face emitting the forward-propagating beam. The fiber-optic cable also includes a mode-stripper, along a segment of the optical fiber, that couples out backward-propagating radiation that has been coupled into the cladding at the output end-face. The fiber-optic cable further includes a waveguide having a waveguide body with a bore containing at least part of the segment of the optical fiber. The bore is defined by an inward-facing surface that guides at least a fraction of the backward-propagating radiation, coupled out of the cladding by the mode-stripper, toward a rear opening of the bore farthest from the output end-face. Additionally, the fiber-optic cable includes one or more sensors or fiber ports that receive portions of the backward-propagating radiation emerging from the rear opening.

Abstract: An electronic package and a manufacturing method thereof are provided, in which a first optoelectronic element having a first optical fiber connection portion is disposed on an electronic module, a second optoelectronic element having a second optical fiber connection portion is disposed on a first level layer of a lower carrying portion of a step-shaped carrier structure, and the electronic module is disposed on a second level layer of the step-shaped carrier structure and the second optoelectronic element having the second optical fiber connection portion, so that the electronic module is electrically connected to the second optoelectronic element having the second optical fiber connection portion. Thereby, two optoelectronic elements having optical fiber connection portions can be easily and vertically integrated, and the second optoelectronic element can be stably carried by the step-shaped carrier structure.

Abstract: To prevent deterioration in an extinction ratio due to asymmetry between a pair of optical waveguides. An optical modulator has a Mach-Zehnder optical waveguide including mutually parallel first and second waveguides and a signal electrode for controlling the phase of light propagating in the Mach-Zehnder optical waveguide. The first and second waveguides have a first section in which the second waveguide has a line width smaller than that of the first waveguide and a second section in which the first waveguide has a line width smaller than that of the second waveguide. The first section and the second section are replaced with each other in curved parts.

Abstract: An optical fiber unit includes: a plurality of optical fibers; and a tube covering the plurality of optical fibers. In the optical fiber unit, a tensile elongation rate of the tube is 100% or more and 500% or less. An optical cable includes: a plurality of optical fiber units; and a cable sheath covering the plurality of optical fiber units. In the optical cable, each of the plurality of optical fiber units includes: a plurality of optical fibers; and a tube covering the plurality of optical fibers, and a tensile elongation rate of the tube is 100% or more and 500% or less.

Abstract: Various embodiments disclosed herein describe photonic passive delay lines that have a waveguide wound into a plurality of straight segments and bends. The photonic passive delay lines are configured to reduce losses from parasitic modes of light generated at the bends. Embodiments of the photonic passive delay lines vary the dimensions of the straight segments to provide different amounts of dephasing between a mode of input light received by the photonic passive delay line and one or more parasitic modes.

Abstract: Embodiments herein describe a photonic platform having a chiplet with a Pockels effect electro-optic layer made of LN or BTO and a substrate. The chiplet is bonded to a photonic wafer which includes a waveguide. In this manner, a ridge waveguide formed by the Pockels effect electro-optic layer and the waveguide utilizes electro-optic effects to tune a signal.

Abstract: Various embodiments disclosed herein describe optomechanical phase shifters. The optomechanical phase shifters may be configured with an asymmetry that improves the performance of the OM phase shifter as a function of wavelength. In some instances, the optomechanical phase shifter includes a section of a waveguide having an asymmetric cross-sectional shape. In other instances an optomechanical phase shifter is incorporated into a controllable optical switch, such that OM phase shifters may be actuated to selectively route light to different outputs of the controllable optical switch.

Abstract: An optical fiber cable includes: a spacer including a plurality of ribs and a plurality of grooves defined by the plurality of ribs; a plurality of optical fiber units accommodated in each of the plurality of grooves; and a cable sheath configured to cover the spacer and the plurality of optical fiber units. The spacer and the cable sheath are integrally formed.