Abstract: Systems and methods for digital communication utilizing entangled qubits are disclosed. The disclosed systems and methods exploit selective entanglement swapping to transfer an entangled state between sites. Each site includes pairs of qubits that are independently entangled with pairs of qubits at the other site. By selectively entangling the qubits within a pair at one site, the qubits of the corresponding pair at the other site also are selectively entangled. When the qubits are entangled, they are projected onto a particular entangled state type. Though no information may be transferred through selective entanglement of one qubit pair, systems and methods of the present disclosure determine whether a set of pairs of qubits are entangled by determining whether the distribution of pairs is a correlated or uncorrelated distribution (a probabilistic approach) and transform the distribution type to a classical bit of data.

Abstract: An optical transmission device includes: a reception unit configured to receive a plurality of light beams and wavelength allocation information of optical signals included in each of the light beams; a demultiplexing unit configured to demultiplex the plurality of light beams received; a plurality of switches configured to switch between transmitting or blocking with respect to the demultiplexed plurality of light beams; a multiplexing unit configured to multiplex light beams transmitted from the plurality of switches; a monitoring unit configured to monitor an intensity of the multiplexed light beams; and a controller configured to, based on the wavelength allocation information, obtain a combination of the light beams not including the optical signals having overlapping wavelengths, and control the plurality of switches in accordance with the combination.

Abstract: A burst-mode laser control circuit and related methods thereof are disclosed. Using an APC loop with an additional burst-mode control circuit, and a switch in series with a diode and in parallel with the laser, a continuous-mode laser driver is enabled to operate in burst-mode by turning the switch on or off via external logic. Burst-mode control manages the switch, and a bandwidth-select circuit using a high or low logic level input, wherein the laser is disabled and the bandwidth-select circuit enters a fast-track mode when the external logic signal has a first level. The laser provides regular optical signals, and the bandwidth-select circuit enters a slow-track mode, thereby enabling the APC loop to operate normally, when the external logic signal has a second level. In addition to a low cost and simple implementation, the control circuit and method provide lasers with a fast response capability using one or more externally-controlled switch circuits to meet demands of PON systems for burst-mode ONUs.

Abstract: A system for delivering optical power over optical conduits includes at least one optical power source delivering multiple optical power forms over an optical conduit with a counter propagating optical control signal.

Abstract: An apparatus includes a substrate and a waveguide coupled to a surface of the substrate. The surface forms a cladding layer of the waveguide. The apparatus includes a photodetector optically coupled to an end of the waveguide. The photodetector is configured to output an electrical signal responsive to receiving a light signal from a core of the waveguide. The apparatus also includes an amplifier device coupled to the substrate. The amplifier device is electrically coupled to the photodetector to amplify the electrical signal to produce an amplified electrical signal.

Abstract: A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed.

Abstract: System and method of generating a received signal strength indication, the method including: selecting a high power level of a transmitter to be received above a receiver threshold at a predetermined distance from the transmitter; selecting a low power level of the transmitter to be received below the receiver threshold at the predetermined distance; transmitting a marker signal at high power; and adjacent in time to the marker signal, transmitting a power-varying signal, wherein a power of the power-varying signal varies monotonically between the high power level and the low power level.

Abstract: A programming device is provided that programs cards, such as payment cards, with data, such as personal data, using light transmitters and receivers. For example, an infrared transmitter may be provided to program personal data (e.g., a customer's credit card number) into a card wirelessly. In doing so, the card may be, for example, completely laminated such that there are no exposed electronic components on the exterior surface of the card and be programmed via light. The programming device may shield the programming components to block ambient light from interacting with those programming components during programming. A conveyor may be utilized to align multiple cards with a programming device to allow assembly-line style programming of the cards.

Abstract: A network component comprising a control plane controller configured to implement a method comprising transmitting routing and wavelength assignment (RWA) information to at least one adjacent control plane controller, wherein the RWA information is transmitted using an interior gateway protocol (IGP). Included is a method comprising communicating a message comprising RWA information to at least one adjacent control plane controller, wherein the message comprises an indication whether the RWA information is static or dynamic. Also included is an apparatus comprising a control plane controller configured to communicate data to at least one adjacent control plane controller, wherein the data comprises RWA information, and wherein the data comprises an indicator that indicates whether the RWA information is associated with a node, a link, or both.

Abstract: A method of operating a BPSK modulator includes receiving an RF signal at the BPSK modulator and splitting the RF signal into a first portion and a second portion that is inverted with respect to the first portion. The method also includes receiving the first portion at a first arm of the BPSK modulator, receiving the second portion at a second arm of the BPSK modulator, applying a first tone to the first arm of the BPSK modulator, and applying a second tone to the second arm of the BPSK modulator. The method further includes measuring a power associated with an output of the BPSK modulator and adjusting a phase applied to at least one of the first arm of the BPSK modulator or the second arm of the BPSK modulator in response to the measured power.

Abstract: An underwater system including at least one input device that is in sensory communication with water and generates input signals. The system further includes at least one optical transmitter and at least one optical receiver that allow omni-directional transmission and reception through water of optical signals representing the input signals, and allow data rates greater than 1 Mbps.

Abstract: An optical fiber breakage point may be located by coupling to the optical fiber an out-of-band optical test signal modulated at a periodic modulation pattern. A distance to the breakage point may be determined from a difference between modulation patterns of transmitted and received test signals.

Abstract: A receiving apparatus and method, a sending apparatus and method, a front-end circuit, a modulator, and a transceiving system are provided. The sending apparatus includes: a double-sideband OFDM modulator, configured to perform double-sideband OFDM modulation on a bit sequence of service data to obtain a double-sideband OFDM analog electrical signal, where the double-sideband OFDM analog electrical signal carries the service data on both positive and negative sidebands, and an IQMZ, configured to perform optical carrier modulation on the double-sideband OFDM analog electrical signal to obtain a double-sideband OFDM optical signal, where the double-sideband OFDM optical signal carries the service data on both positive and negative sidebands. In comparison with a traditional manner in which service data is only carried on a positive sideband, bandwidth utilization in the present invention doubles.

Abstract: In one embodiment, an optical device comprising an emitter, first and second emitter optical elements and a receiver is disclosed. The emitter and the receiver may be arranged substantially along a longitudinal axis. The first and second emitter optical elements may be interposing the longitudinal axis. One other embodiment discloses an optical device comprising an emitter and a receiver arranged on a longitudinal axis. The optical device may further comprise first and second emitter optical elements arranged along an axis orthogonal to the longitudinal axis but interposing the longitudinal axis. In another embodiment, a proximity sensor having first and second emitters interposing a longitudinal axis is disclosed.

Abstract: The present invention provides a high-speed 100 G optical transceiver for InfiniBand and Ethernet with associated mapping to frame InfiniBand and Ethernet into GFP-T. The optical transceiver utilizes an architecture which relies on standards-compliant (i.e., multi-sourced) physical client interfaces. These client interfaces are back-ended with flexible, programmable Field Programmable Gate Array (FPGA) modules to accomplish either InfiniBand or Ethernet protocol control, processing, re-framing, and the like. Next, signals are encoded with Forward Error Correction (FEC) and can include additional Optical Transport Unit (OTU) compliant framing structures. The resulting data is processed appropriately for the subsequent optical re-transmission, such as, for example, with differential encoding, Gray encoding, I/Q Quadrature encoding, and the like. The data is sent to an optical transmitter block and modulated onto an optical carrier. Also, the same process proceeds in reverse on the receive side.

Abstract: A system for communicating data comprising sender and receiver subsystems; at least one data input; at least one entangled photon source; first photons of the pairs of entangled photons outputted by the at least one photon source being processed by one of the sender or receiver subsystem; second photons of the pairs of entangled photons being processed by the other of the sender or receiver subsystem; a photonic element configured to receive the first photons of the pairs of entangled photons and enable interference therebetween; at least one absorber configured to absorb the first photons after passage through the beam splitter, the absorbance of the first photons operating to transfer the properties of the entanglement to the second photons of the pairs of entangled photons; and a Bell state measurement element operatively associated with the receiver subsystem configured to measure the second photons of the pairs of entangled photons.

Abstract: Methods and systems for split voltage domain receiver circuits are disclosed and may comprise amplifying complementary received signals in a plurality of partial voltage domains, and combining the amplified received signals, utilizing a stacked cascode amplifier for each domain, into a single differential signal in a single voltage domain. The stacked cascode amplifiers may comprise a feedback loop having a comparator which controls a current source in each domain. The complementary signals may be received from a photodiode, which may be integrated in the integrated circuit. The amplified received signals may be combined via stacked common source or common emitter amplifiers. The received signals via may be amplified by stacked inverters. The amplified received signals may be AC or DC coupled prior to the combining. The complementary received signals may be amplified and combined via cascode amplifiers. The voltage domains may be stacked and may be controlled by feedback loops.

Abstract: A burst-mode phase shift keying (PSK) communications system according to an embodiment of the present invention enables practical, power-efficient, multi-rate communications between an optical transmitter and receiver. Embodiments may operate on differential PSK (DPSK) signals. An embodiment of the system utilizes a single interferometer in the receiver with a relative path delay that is matched to the DPSK symbol rate of the link. DPSK symbols are transmitted in bursts, and the data rate may be varied by changing the ratio of the burst-on time to the burst-off time. This approach offers a number of advantages over conventional DPSK implementations, including near-optimum photon efficiency over a wide range of data rates, simplified multi-rate transceiver implementation, and relaxed transmit laser line-width requirements at low data rates.

Abstract: A dual-polarization, 4-subcarriers orthogonal frequency division multiplexed signal carrying information bits is transmitted in an optical communication network without transmitting a corresponding pilot tone or training sequence. A receiver receives the transmitted signal and recovers information bits using a blind equalization technique and by equalizing the 4-subcarriers OFDM signal as a 25-QAM signal in time domain with a CMMA (constant multi modulus algorithm) equalization method.

Abstract: An LED light and communication system is in communication with a broadband over power line communications system. The LED light and communication system includes at least one optical transceiver light fixture. The optical transceiver light fixture includes a plurality of light emitting diodes, at least one photodetector, and a processor. A facility management unit is in communication with the processor. The facility management unit is constructed and arranged to control the operation of the optical transceiver light fixture.