Abstract: Latches for securing circuit board assemblies within a slot of a telecommunications chassis are provided. In one embodiment, a latch for restricting motion of a substrate with respect to a fixed component within a slot of the telecommunications chassis is described. For example, the latch may include a mounting section allowing the latch to be mounted to the substrate. The latch may also include a cantilever section and an arc section connecting the mounting section to the cantilever section. Furthermore, the latch may include a retention component extending from a surface of the cantilever section. The retention component may be configured to restrict motion of the substrate when engaged with the fixed component within the slot.

Abstract: An optical transmission device includes: a frontend circuit, a converter, an equalizer, a recovery, spectrum detector a correction information generator, and a transmitter. The frontend circuit converts an optical signal received via an optical network into an electric signal. The converter converts an output signal of the frontend circuit into a digital signal. The equalizer equalizes the digital signal or a second digital signal that is generated based on the digital signal. The recovery recovers a symbol from an output signal of the equalizer. The spectrum detector detects a reception spectrum of the optical signal based on the digital signal or the second digital signal. The correction information generator generates, according to the reception spectrum, correction information for correcting a shape of a transmission spectrum of the optical signal. The transmitter transmits the correction information to the source device.

Abstract: A grating- and fiber-coupled multi-beam coherent receiving system in a mid- and far-infrared band includes a mid- and far-infrared local oscillator signal source, a phase grating, a multi-beam fiber coupling system, a 2×2 pixel mid- and far-infrared superconducting HEB mixer, a multi-channel DC bias source, a multi-channel cryogenic low-noise amplifier, and a room-temperature intermediate-frequency and high-resolution spectrum processing unit. In a 2×2 multi-beam superconducting receiving system, an echelle grating and a cryogenic optical fiber are used to distribute and couple the local oscillator signal, and the mid- and far-infrared band high-sensitivity superconducting HEB mixer is used to realize efficient local oscillator signal distribution and coupling, and ultimately achieve high-sensitivity and high-resolution multi-beam spectrum reception in the mid- and far-infrared band.

Abstract: Exemplary arrangements relate to receivers for receiving information using very weak light pulses. The exemplary arrangements include an input optical signal having a sequence of light pulses, optical elements, and a detector. The optical elements include at least one polarisation modulator, at least one polarisation splitting cube, an element with a different optical path length for different polarisations, and at least one polarization rotating plate. Part of the optical signal follows a shorter optical path length, and part of it follows a longer optical path length. The element with different optical path lengths is placed between two polarisation beam splitter cubes. The beam splitter cubes split and then merge the sequence of pulses reducing the sequence by half and forming an amplified signal readable by the detector. Exemplary arrangements also relate to a method for transmitting information using the exemplary arrangement.

Abstract: Systems and methods for a passive-active distributed antenna architecture are provided. In one example embodiment, a distributed antenna architecture comprises: a passive wireless coverage system in communication with a base station; an active wireless coverage system in communication with the base station; a conductor network comprising a plurality of cables coupled to at least one splitter-combiner device; and a DC power injector circuit coupled to the conductor network; wherein the DC power injector circuit injects a DC power signal onto the conductor network; wherein the passive wireless coverage system communicates analog radio frequency (RF) signals with the base station over the conductor network.

Abstract: An apparatus and system having an optical integrated circuit (referred to herein as an OMTP) configured for power on during discovery and optically communicating with the OMTP reader for the purpose of extracting data.

Abstract: A network capable of 1:n communication in an optical wireless mesh network is provided. An optical wireless communication network communication system A1 comprises an optical wireless communication network communication system A1 comprising: an optical transmitter Ti and an optical receiver Ri, and an optical fiber cable or a coaxial cable for transmitting a signal received by the optical receiver Ri to the optical transmitter Ti at each node, wherein the n+1 node Ni is connected by a network, the optical wireless communication transceiver Si at each node Ni is capable of transmitting simultaneously to all the optical wireless communication transceivers Sj of the other n nodes Nj when its own node Ni and all of the other n nodes Nj satisfy a predetermined condition, and can be received simultaneously from all the optical wireless communication transceivers Sj of the other n nodes Nj.

Abstract: Provided is a wavelength path communication node device with no collision of wavelengths and routes, capable of outputting arbitrary wavelengths, and capable of outputting them to arbitrary routes. An add/drop multiplexer (11) includes a communication unit (101) that communicates an optical signal with at least one client device and at least one network and a control unit (102) that indicates a transfer destination of the optical signal according to an attribute of the received optical signal to the communication unit (101). The control unit (102) indicates an attenuation amount of the optical signal to the communication unit (101) for each connected device. When a connected device is changed, the control unit (102) instructs the communication unit (101) to change the attenuation amount. The communication unit (101) attenuates the optical signal with the attenuation amount indicated by the control unit (102) and transfers the attenuated optical signal to a transfer destination.

Abstract: A counter-directional optical network having multiple channels includes a source module connected with at least two network nodes by a fiber ribbon including an array of optical fibers. Each channel includes at least one optical fiber. The source module includes multiple signal sources, each signal source connected with one of the channels and operable to transmit a source signal in a direction in the channel. Each network node includes a modulator for processing the source signal with a data input signal forming a message signal, a switch for selecting one of the channels to transmit the message signal and a receiver connected with one of the channels for receiving a message signal from another node. The message signal is transmitted to the receiver of a receiving node in a direction opposite to the transmission direction of the source signal via the channel connected to the receiver of the receiving node.

Abstract: The ability to communicate with a specific subject at a prescribed location who lacks any communications equipment opens up many intriguing possibilities. Communications across noisy rooms, hail and warn applications, and localized communications directed at only the intended recipient are a few possibilities. We disclose and show localized acoustic communications, which we call photoacoustic communications, with a listener at long standoff distances using a modulated laser transmitted toward the receiver's ear. The optically encoded information is converted into acoustic messages via the photoacoustic effect. The photoacoustic conversion of the optical information into an audible signal occurs via the absorption of the light by ambient water vapor in the near area of the receiver's ear followed by airborne acoustic transmission to the ear. The recipient requires no external communications equipment to receive audible messages.

Abstract: A full duplex communication network includes an optical transmitter end having a first coherent optics transceiver, an optical receiver end having a second coherent optics transceiver, and an optical transport medium operably coupling the first coherent optics transceiver to the second coherent optics transceiver. The first coherent optics transceiver is configured to simultaneously transmit a downstream optical signal and receive an upstream optical signal. The second coherent optics transceiver is configured to simultaneously receive the downstream optical signal from the first coherent optics transceiver and transmit the upstream optical signal first coherent optics transceiver. At least one of the downstream optical signal and the upstream optical signal includes at least one coherent optical carrier and at least one non-coherent optical carrier.

Abstract: The present disclosure provides optical link management in a marine seismic environment. A first device can transmit, to a second device, a first optical transmission at a first output level. The first optical transmission can include a first packet corresponding to a network protocol. The first device can determine that the second device failed to receive the first packet via the first optical transmission. The first device can transmit, responsive to failure of the first optical transmission, a second optical transmission at a second output level different than the first output level. The second optical transmission can include a second packet corresponding to the network protocol. The first device can identify that the second packet was successfully received by the second link manager agent. The first device can establish, responsive to the identification that the second packet was successfully received, the second output level as a transmission output level for the first device.

Abstract: The invention relates to a navigation satellite (10, 10?, 10?), in particular for a medium earth orbit (MEO), having a housing (12) and a navigation antenna (16) connected to the housing (12) for emission of navigation signals in a preferred direction. Furthermore, the navigation satellite (10, 10?, 10?) has an optical communication system (22) for unidirectional or bidirectional signalling having at least one other satellite advancing in the direction of movement and/or having at least one other satellite following in the direction of movement. The navigation satellite (10, 10?, 10?) has a holder (for example as navigation antenna), which is arranged rotatably on the housing (12) about an axis of rotation (17), the optical communication system being (22) arranged on the holder.

Abstract: Disclosed is a method for processing a service function chain request, which includes: classifying the service function chain request received; determining a domain to process the service function chain request; wherein the service function chain requested by the service function chain request includes at least one virtual network function (VNF); distributing the service function chain request to the domain determined; determining at least one server for implementing the at least one VNF; and determining the time at which the at least one server implements the at least one VNF. The disclosure also discloses a system for processing a service function chain request.

Abstract: Submarine cable branching units with fiber pair switching configured to allow any number of trunk cable fiber pairs to access the optical spectrum any number of branch cable fiber pairs. Access to a particular branch terminal is not limited to predefined subset of the trunk fiber pairs. This approach allows fewer branch cable fiber pairs to be equipped in each branching unit, reducing system cost, simplifies system planning and provides flexible routing of overall trunk cable capacity.

Abstract: Systems, methods, and devices are disclosed for monitoring optical communications between a managed location and a remote location. In particular, an optical signal is transmitted over an optical fiber and passed-through a test device. A portion of the optical signal is filtered from the original optical signal and passed to a monitoring unit. The monitoring unit may instruct one or more switches in the test device to loop the optical signal back toward the managed location. Subsequently, testing and monitoring may be performed at the managed location. The device may provide a test output or may transmit the information to the managed location.

Abstract: Optical signal receivers and methods are provided that include multiple optical resonators, each of which receives a portion of an arriving optical signal. Various of the optical resonators are tuned or detuned from a carrier wavelength, and produce an intensity modulated output signal in response to modulation transitions in the arriving optical signal. A detector determines phase transitions in the arriving optical signal, by analyzing the intensity modulation output signals from the optical resonators, and distinguishes between differing phase transitions that result in a common final state of the arriving optical signal.

Abstract: In one embodiment, an apparatus includes a plurality of optical module ports in communication with a physical layer device in a network device. Communication of signals from the physical layer device to the optical module ports is configured such that the signals received at the optical module ports adjacent to one another are at different phases to reduce electromagnetic interference associated with the optical module ports.

Abstract: An apparatus measures the transverse profile of vectorial optical field beams, including at least the directional intensity complex amplitude and the polarization spatial profile. The apparatus contains a polarization separation module, a weak perturbation module, and a detection module. Characterizing the transverse profile of vector fields provides an optical metrology tool for both fundamental studies of vectorial optical fields and a wide spectrum of applications, including microscopy, surveillance, imaging, communication, material processing, and laser trapping.

Abstract: Systems and methods are described for providing high throughput connectivity between multiple network nodes, such as satellites in Earth orbit or ground stations, using a multi-access free space optical communications transceiver. The transceiver includes a focal plane assembly with an array of moveable optical fibers or fiber bundles, multi-core fibers, or a combination thereof. Each optical fiber bundle may include a centrally-located data fiber with guide fibers disposed around the data fiber. A controller may align a tip of the data fiber with a focal spot associated with incoming optical signals based on measured power levels of optical signals received in the guide fibers. The data fiber may be a multi-mode fiber (MMF) and circuitry in the transceiver may couple signals from the MMF into separate single-mode fibers (SMF) and then coherently combine signals from the SMFs.