Abstract: A method of processing data and related apparatuses. The method relies on an optical finite impulse response (FIR) filter. This optical FIR filter comprises several delay stages having weights set in accordance with parameters of a transformation to be applied by the optical FIR filter. Each of the delay stages is configured to impose a delay matched to a given input data period corresponding to a given input sample rate. According to the method, an optical signal is coupled into the optical FIR filter. The optical signal carries a data stream of input samples encoded at the given input sample rate; the data stream represents the data to be processed. Next, output samples are collected from an output data stream carried by an output optical signal obtained in output of the optical FIR filter. A set of output samples are obtained, which are representative of processed data.

Abstract: An electrical memristive device has a layer structure. The later structure comprises two electrodes and a bilayer material arrangement that connects the two electrodes. The bilayer material arrangement may, for example, be sandwiched by the two electrodes, in direct contact therewith. The bilayer material arrangement includes an HfOy layer, where 1.3±0.1?y<1.9±0.1, as well as a WOx layer in direct contact with the HfOy layer, where 2.5±0.1?x<2.9±0.1. The bilayer arrangement involves sub-stoichiometric layers of HfOy and WOx, where the WOx layer may advantageously have a polycrystalline structure in the monoclinic phase, while the HfOy layer is preferably amorphous.

Abstract: A method, system, and computer program product for using photorefractive material for analog optic storage and other applications of optical neuromorphic systems. The method may include coupling electromagnetic radiation into a first optical input and a second optical input, where the first optical input and the second optical input are part of an integrated optical device, the integrated optical device including: a first optical mode coupler connected to a first pair of optical ports including a first optical input and output; a second optical mode coupler connected to a second pair of optical ports including a second optical input and output, and the first optical mode coupler connected to the second optical mode coupler using a pair of arms (including a photorefractive material). The method may also include obtaining an optical interference pattern in the photorefractive material of each arm of the integrated optical device.

Abstract: A method, system, and computer program product for using photorefractive material for analog optic storage and other applications of optical neuromorphic systems. The method may include coupling electromagnetic radiation into a first optical input and a second optical input, where the first optical input and the second optical input are part of an integrated optical device, the integrated optical device including: a first optical mode coupler connected to a first pair of optical ports including a first optical input and output; a second optical mode coupler connected to a second pair of optical ports including a second optical input and output, and the first optical mode coupler connected to the second optical mode coupler using a pair of arms (including a photorefractive material). The method may also include obtaining an optical interference pattern in the photorefractive material of each arm of the integrated optical device.

Abstract: A train control system configured to automatically execute and ensure compliance with all requirements for radio blocking. A radio blocking module of the physical train control system of a lead train retrieves and displays the appropriate clearance points for acceptance by the train driver of the lead train. Once accepted, the clearance points are transmitted to a trailing train for display and acceptance by the train driver of the trailing train. An accepted clearance point is passed to the train control system for use as the next destination point for navigation purposes. The train control system can also electronically log all acts to comply with applicable radio blocking requirements.

Abstract: Aspects of the present disclosure are directed to a photorefractive layer stack. A plurality of layers are stacked along in a stacking direction and designed so as to enable a photorefractive response. That is, a refractive index of the plurality of layers modulates in response to illuminating the plurality of layers with an optical pattern of modulated intensity. A plurality of electrically insulated areas are arranged in a plane perpendicular to the stacking direction. The plurality of electrically insulated areas are optically homogenous and prevent lateral diffusion between any two electrically insulated areas of the plurality of electrically insulated areas.

Abstract: The present invention is notably directed to an electro-optical device. This device has a layer structure, which comprises a stack of III-V semiconductor gain materials, an n-doped layer and a p-doped layer. The III-V materials are stacked along a stacking direction z, which is perpendicular to a main plane of the stack. The n-doped layer extends essentially parallel to the main plane of the stack, on one side thereof. The p-doped layer too extends essentially parallel to this main plane, but on another side thereof. A median vertical plane can be defined in the layer structure, which plane is parallel to the stacking direction z and perpendicular to the main plane of the stack. Now, the device further comprises two sets of ohmic contacts, wherein the ohmic contacts of each set are configured for vertical current injection in the stack of III-V semiconductor gain materials.

Abstract: An intelligent, on-board, train brake safety monitoring and fault action system is disclosed. The system compares measured dynamic train brake performance using on-board train control system, such as a LEADER® system. Using the measured dynamic train brake performance, the brake monitoring system can determine whether the train is capable of stopping within a particular required distance, such as a stop distance set by a positive train control system in which the train is participating. The ongoing ability to meet external braking criteria, such as compliance with positive train control stop distances, may be used to extend the interval between any mandated train brake inspections and tests.

Abstract: Aspects of the present disclosure are directed to a photorefractive layer stack. A plurality of layers are stacked along in a stacking direction and designed so as to enable a photorefractive response. That is, a refractive index of the plurality of layers modulates in response to illuminating the plurality of layers with an optical pattern of modulated intensity. A plurality of electrically insulated areas are arranged in a plane perpendicular to the stacking direction. The plurality of electrically insulated areas are optically homogenous and prevent lateral diffusion between any two electrically insulated areas of the plurality of electrically insulated areas.

Abstract: An integrated optical circuit for holographic information processing is disclosed. The optical circuit comprises a photorefractive medium and two transmitter arrays. The transmitter arrays are adapted for locally changing the refractive index of the photorefractive medium for holographic encoding of the information in a working plane of the photorefractive medium by transmitting light via optical paths into the photorefractive medium such that an interference pattern is generated in the working plane. The optical paths and the working plane are arranged in a single optical plane.

Abstract: An integrated optical circuit for holographic information processing is disclosed. The optical circuit comprises a photorefractive medium and two transmitter arrays. The transmitter arrays are adapted for locally changing the refractive index of the photorefractive medium for holographic encoding of the information in a working plane of the photorefractive medium by transmitting light via optical paths into the photorefractive medium such that an interference pattern is generated in the working plane. The optical paths and the working plane are arranged in a single optical plane.

Abstract: A train control system configured to automatically execute and ensure compliance with all requirements for radio blocking. A radio blocking module of the physical train control system of a lead train retrieves and displays the appropriate clearance points for acceptance by the train driver of the lead train. Once accepted, the clearance points are transmitted to a trailing train for display and acceptance by the train driver of the trailing train. An accepted clearance point is passed to the train control system for use as the next destination point for navigation purposes. The train control system can also electronically log all acts to comply with applicable radio blocking requirements.

Abstract: The present invention is notably directed to an electro-optical device. This device has a layer structure, which comprises a stack of III-V semiconductor gain materials, an n-doped layer and a p-doped layer. The III-V materials are stacked along a stacking direction z, which is perpendicular to a main plane of the stack. The n-doped layer extends essentially parallel to the main plane of the stack, on one side thereof. The p-doped layer too extends essentially parallel to this main plane, but on another side thereof. A median vertical plane can be defined in the layer structure, which plane is parallel to the stacking direction z and perpendicular to the main plane of the stack. Now, the device further comprises two sets of ohmic contacts, wherein the ohmic contacts of each set are configured for vertical current injection in the stack of III-V semiconductor gain materials.

Abstract: A hybrid III-V on silicon laser device includes a layer structure, with a stack of III-V semiconductor gain materials, a silicon waveguide core and a cladding structure. The semiconductor gain materials stack is along a stacking direction, which is perpendicular to a main plane of the stack. The silicon waveguide core extends along a longitudinal direction, parallel to the main plane. The cladding structure extends between said waveguide core and the stack. The device further comprises an optical coupling structure formed in the layer structure. This coupling structure is designed: 1) to allow a hybrid-mode optical coupling of radiation between the stack of III-V semiconductor gain materials and the tapered waveguide core; and 2) to favor a coupling of a fundamental transverse optical mode of said radiation over a coupling of one or more higher-order transverse optical modes of said radiation from the stack into the waveguide core.

Abstract: An optical amplifier device includes: an optical waveguide core; an active gain material layer stack; and a dielectric material between the active gain material layer stack and the optical waveguide core. The optical waveguide core includes an input portion, a middle portion, an output portion and tapers. The middle portion is connected to the input and output portions via the tapers. The tapers widen outwardly, whereby the middle portion has an effective refractive index that is smaller than an effective refractive index of any of the input and output portions. The active gain material layer stack includes III-V semiconductor material layers having different refractive indices so as to possess an effective refractive index that is larger than the effective refractive index of the middle portion. The active gain material layer stack extends relative to a subsection of the optical waveguide core that includes the middle portion and tapers.

Abstract: An intelligent, on-board, train brake safety monitoring and fault action system is disclosed. The system compares measured dynamic train brake performance using on-board train control system, such as a LEADER® system. Using the measured dynamic train brake performance, the brake monitoring system can determine whether the train is capable of stopping within a particular required distance, such as a stop distance set by a positive train control system in which the train is participating. The ongoing ability to meet external braking criteria, such as compliance with positive train control stop distances, may be used to extend the interval between any mandated train brake inspections and tests.

Abstract: An apparatus includes an optical adaptor having monolithically integrated optical elements and first micro-mechanical features, the latter defining at least a first horizontal reference surface and a first vertical reference surface; wherein the first horizontal reference surface is perpendicular to an optical plane, the latter being perpendicular the optical axis of the optical elements; and wherein the first vertical reference surface is perpendicular to the first horizontal reference surface and parallel to the optical axis.

Abstract: An apparatus includes an optical adaptor having monolithically integrated optical elements and first micro-mechanical features, the latter defining at least a first horizontal reference surface and a first vertical reference surface; wherein the first horizontal reference surface is perpendicular to an optical plane, the latter being perpendicular the optical axis of the optical elements; and wherein the first vertical reference surface is perpendicular to the first horizontal reference surface and parallel to the optical axis.

Abstract: An apparatus includes an optical adaptor having monolithically integrated optical elements and first micro-mechanical features, the latter defining at least a first horizontal reference surface and a first vertical reference surface; wherein the first horizontal reference surface is perpendicular to an optical plane, the latter being perpendicular the optical axis of the optical elements; and wherein the first vertical reference surface is perpendicular to the first horizontal reference surface and parallel to the optical axis.

Abstract: An apparatus includes an optical adaptor having monolithically integrated optical elements and first micro-mechanical features, the latter defining at least a first horizontal reference surface and a first vertical reference surface; wherein the first horizontal reference surface is perpendicular to an optical plane, the latter being perpendicular the optical axis of the optical elements; and wherein the first vertical reference surface is perpendicular to the first horizontal reference surface and parallel to the optical axis.