Abstract: A fail-safe wireless power transmission system having a transmitter, a receiver, a receiver functionality monitor unit, a transmitter functionality monitor unit and at least two sensors. The transmitter has at least one low emission state, and at least one high emission state, the high emission states having higher emissions and more complex safety systems. The transmitter may be precluded from switching from a low emission state to any high emission states upon detection of a receiver control unit malfunction, a transmitter control unit malfunction, a likelihood of human-accessible emission from the system greater than a predetermined level, or an inconsistency between results arising from at least two of the sensors. Two different methods of such preclusion may be used simultaneously or consecutively to improve reliability. A transmitter control unit analyzes data from the sensors, and performs calculations to determine if and what type of preclusion is needed.

Abstract: A node configured to operate in an optical network includes P switching planes interconnected by an S×S cross-plane switch, P>1; and Ni degrees per switching plane Pi where i=1 to P, each degree formed by corresponding degree components having R ports, wherein a first set of ports of the R ports is for intra-plane switching, a second set of ports of the R ports is for inter-plane switching, and a third set of ports of the R ports is for in-plane add/drop. S is greater than or equal to a sum of a number of degrees across all of the P switching planes. R is greater than or equal to a sum of the first set of ports, the second set of ports, and the third set of ports.

Abstract: Disclosed in some examples are methods, systems, devices, and machine-readable mediums which optimize one or more metrics of a communication system by intentionally changing symbols in a bitstream after encoding by, an error correction coder, but prior to transmission. The symbols may be changed to meet a communication metric optimization goal, such as decreasing a high PAPR, reducing an error rate, reducing an average power level (to save battery), or altering some other communication metric. The symbol that is intentionally changed is then detected by the receiver as an error and corrected by the receiver utilizing the error correction coding.

Abstract: An optical communication device includes a plurality of laser sources, a plurality of first meta-lenses, and an optical fiber. The laser sources transmit a plurality of laser beams in the same direction according to electrical signals. The laser beams have different wavelengths. The first meta-lenses receive the laser beams, and in a first substrate, refract the laser beams to a focal point to generate a mixed laser beam. The optical fiber receives the mixed laser beam for transmission. The focal point is arranged at the input end of the optical fiber.

Abstract: Methods, devices, and systems are described for free space optical communication. An example device can comprise a laser, a modulator configured to cause the laser to output an optical signal comprising a data signal and a beacon signal, a defocuser optically coupled to the laser and configured to receive the optical signal and control a beam divergence of the optical signal, an optical interface configured to receive the optical signal from the defocuser and output the optical signal into free space, and a controller configured to cause the defocuser to adjust the beam divergence based on an operational mode of the laser.

Abstract: A receiver and a transmitter are disclosed that are applicable to space, air or ground RF communication systems and are applicable to systems where one or more signals of multiple types and characteristics are present in any given beam such as a communication spot beam on a high-throughput satellite. The transmitter can include an optical frequency comb configured to generate a multitude of equidistantly spaced optical wavelengths; an electro-optic modulator that receives the multitude of equidistantly spaced optical wavelengths and a data signal and produce a modulated optical beam; an optical circulator that receives the modulated optical beam; an optical switch that switches the modulated optical beam to an output port of the optical switch terminated in one or more Fiber-Bragg gratings; a wavelength division multiplexer that receives individual wavelengths of the modulated optical beam that are time-delayed from the optical circulator; and a plurality of antenna elements.

Abstract: An optical switch plane with one or more switch layers, each layer with multiple switches is provided. In a data center, an optical circuit switch plane is added between the device plane and packet switch plane. Direct speed of light connections may be created between devices, the data center temporally shrunk, remote devices localized, elephant flows kept out of mouse switches, mouse switch spend reduced, stranded resources recovered, layer 1 reconfigured and optimized, bare metal bent, secure tunnels created, networks physically isolated, failure resiliency increased, and packet switch congestion avoided.

Abstract: Methods and systems for mode converters for grating couplers may include a photonic chip comprising a waveguide, a grating coupler, and a mode converter, with the waveguide being coupled to the grating coupler via the mode converter. The mode converter may include waveguide material and tapers defined by triangular regions, where the triangular regions do not have waveguide material. The photonic chip may receive an optical signal in the mode converter from the waveguide, where the received optical signal has a light profile that may be spatially deflected in the mode converter to configure a desired profile in the grating coupler. A long axis of the tapers may be parallel to a direction of travel of the optical signal. The long axis of the tapers may point towards the input waveguide of the grating couplers, which may be linear.

Abstract: A system for optical transduction of quantum information includes a qubit chip including a plurality of data qubits configured to operate at microwave frequencies, and a transduction chip spaced apart from the qubit chip, the transduction chip including a microwave-to-optical frequency transducer. The system includes an interposer coupled to the qubit chip and the transduction chip, the interposer including a dielectric material including a plurality of superconducting microwave waveguides formed therein. The plurality of superconducting microwave waveguides is configured to transmit quantum information from the plurality of data qubits to the microwave-to-optical frequency transducer on the transduction chip, and the microwave-to-optical frequency transducer is configured to transduce the quantum information from the microwave frequencies to optical frequencies.

Abstract: Disclosed in some examples, are optical devices, systems, and machine-readable mediums that send and receive multiple streams of data across a same optical communication path (e.g., a same fiber optic fiber) with a same wavelength using different light sources transmitting at different power levels—thereby increasing the bandwidth of each optical communication path. Each light source corresponding to each stream transmits at a same frequency and on the same optical communication path using a different power level. The receiver differentiates the data for each stream by applying one or more detection models to the photon counts observed at the receiver to determine likely bit assignments for each stream.

Abstract: An optical network device receives an optical signal, to which polarization information is added, from a transmitter via a transmission line. The receiver generates electric-field-information signal of the optical signal. The processor acquires, for respective polarization rotation amounts, the electric-field-information signal during a period specified by the polarization information. The processor calculates, for respective polarization rotation amounts and based on the electric-field-information signal, evaluation values corresponding to powers of the optical signal at a plurality of positions on the transmission line. The processor calculates, for respective positions, variations in the evaluation values corresponding to the polarization rotation amounts.

Abstract: An information processing apparatus of a first information processing apparatus coupled to a second information processing apparatus via an optical fiber, the information processing apparatus includes a memory, and a processor coupled to the memory and the processor configured to store, into the memory, a first reception power of an optical signal received via the optical fiber when an initial value is stored in the memory, store, into the memory, a second reception power of the optical signal received via the optical fiber when the first reception power is stored in the memory, and stop receiving the optical signal when a difference between the first reception power and the second reception power is equal to or greater than a first threshold value.

Abstract: In some embodiments, a system includes a super-channel multiplexer (SCM) and an optical cross connect (OXC) switch. The SCM is configured to multiplex a set of optical signals into a super-channel optical signal with a wavelength band. The OXC switch is configured to be operatively coupled to the SCM and a reconfigurable optical add-drop multiplexer (ROADM) degree. The OXC switch is configured to be located between the SCM and the ROADM degree and the OXC switch, the SCM, and the ROADM degree are configured to be included in a colorless, directionless, and contentionless (CDC) optical network. The OXC switch is configured to switch, based on the wavelength band, the super-channel optical signal to an output port from a set of output ports of the OXC switch. The OXC switch is configured to transmit the super-channel optical signal from the output port to the ROADM degree.

Abstract: A system for enabling deep fiber access to a software defined network includes a hybrid fiber coaxial (HFC) network, a software defined network (SDN) control agent disposed in the HFC network and a core network. The core network includes an IP backbone and an SDN. The SDN control agent receives a notification of a quality of service (QoS) degradation event and the accesses local table rules stored in the SDN control agent to determine whether the local table rules identify an action to implement in response to the notification. When the local table rules identify the control agent action to take in response to the notification implementing the action. When the local table rules do not identify the action to be implemented by the SDN control agent in response to the notification, then the SDN control agent accesses the SDN controller to determine whether the SDN controller can identify a controller action to take in response to the notification.

Abstract: The function of each component of an optical transmission device is as follows. The wavelength selecting means has a means for selecting an optical signal, and a means for outputting a signal after adjusting the signal level. The optical amplifying means amplifies the wavelength multiplexed signal having the adjusted signal level. The measuring means measures the spectrum of the amplified wavelength multiplexed signal. The setting means sets a spectrum shape, which serves as a reference of the wavelength multiplexed signal to be outputted to the transmission line, as output spectrum setting information. The control means compares the measured spectrum with the output spectrum setting information and determines the attenuation amount when adjusting the signal level for each wavelength of the wavelength multiplexed signal in the wavelength selecting means. The wavelength selecting means adjusts the signal level on the basis of the determined attenuation amount.

Abstract: In order to provide a compact and low power consumption optical repeater capable of amplifying a plurality of wavelength ranges, the optical repeater is provided with: an excitation means which generates excitation light in a single wavelength range; a first light amplification means which is excited by the excitation light and the amplification band of which is a first wavelength range; and a second light amplification means which is excited by the excitation light and the amplification band of which is a second wavelength range different from the first wavelength range.

Abstract: A fiber-optic communication system includes a first optical transceiver and a second optical transceiver. First, the first optical transceiver is configured to transmit signals to the second optical transceiver using an optical transmission power having an initial value. When the optical receiving power inputted into the second optical transceiver is larger than the expected input power of the second optical transceiver, a power compensation value is acquired according to the optical receiving power and the expected input power. The first optical transceiver is configured adjust its optical transmission power according to the power compensation value and then transmit signals to the second optical transceiver using the adjusted optical transmission power.

Abstract: Joint power allocation and cell formation for energy efficient (EE) visible light communication (VLC) networks is described. A set of rules for clustering users and then associating all the access points (APs) to the clustered users based on a proposed metric is developed. The energy efficiency is maximized by allocating power to users based on quality of service (QoS) constraints. The present disclosure jointly allocates the power and decides which APs must participate in communication and which ones must be switched off to minimize inter-cell interference. Numerical results demonstrate a significant improvement in energy efficiency compared to the traditional methods of clustering and AP assignment.

Abstract: Disclosed in some examples, are optical devices, systems, and machine-readable mediums that send and receive multiple streams of data across a same optical communication path (e.g., a same fiber optic fiber) with a same wavelength using different light sources transmitting at different power levels—thereby increasing the bandwidth of each optical communication path. Each light source corresponding to each stream transmits at a same frequency and on the same optical communication path using a different power level. The receiver differentiates the data for each stream by applying one or more detection models to the photon counts observed at the receiver to determine likely bit assignments for each stream.

Abstract: This application relates to the communications field, and discloses a signal transmitting method and apparatus, a transmitter, and a signal transmission system. An example method includes: generating a real-number-type signal; performing phase rotation processing on the real-number-type signal to obtain a complex-number-type signal, where a value of a real part signal of the complex-number-type signal is equal to a value of an imaginary part signal of the complex-number-type signal; and transmitting the complex-number-type signal to a receiver.