Abstract: A superposition circuitry superposes a dither signal on a reference DC bias voltage and outputs a resultant voltage as a bias voltage to an MZ modulator, during control of a driving voltage amplitude. During the control of the driving voltage amplitude to the MZ modulator, an amplitude setter determines, by varying the amplitude of an output voltage from an amplifier, a plurality of amplitudes of output curves from a synchronous detector, each of which is obtained by varying the reference DC bias voltage output from a bias controller, and the amplitude setter sets the amplification factor of the amplifier, based on an amplitude of the output voltage from the amplifier that corresponds to an amplitude satisfying a predetermined condition, out of the plurality of the amplitudes of the output curves from the synchronous detector.

Abstract: An network system control method includes: planning an optical tunnel network according to a routing path table and transmitting a control command according to an optical tunnel network configuration of the optical tunnel network by a tunnel scheduling module, wherein the optical tunnel network includes multiple optical tunnels, and each of the optical tunnels includes a routing path and a wavelength; outputting a control signal to multiple optical switches and multiple top-of-rack switches according to the control command by a configuration managing module; receiving flow statistics of the dataflows of the optical tunnels from the top-of-rack switches, calculating dataflow rates of the dataflows and bandwidth usage rates of the optical tunnels, and transmitting a load notification when one of the bandwidth usage rates exceeds an preset interval by a bandwidth usage monitor; and replanning the optical tunnel network according to the load notification by the tunnel scheduling module.

Abstract: Embodiments are disclosed for generating a lookup table value for calibrating a lookup table circuit in an optical transmitter. The example method includes generating a calibration signal. The calibration signal encodes a plurality of bits in a number of amplitude levels. The example method further includes transmitting the calibration signal to a module under calibration and transmitting a symbol sequence of defined length to a reference module. The reference module compares the symbol sequence with a distorted signal received from the module under calibration to generate a set of condition count statistics. The example method further includes receiving the set of condition count statistics from the receiver in the reference module and calculating a lookup table value based on the set of condition count statistics. The example method further includes transmitting the lookup table value to a transmitter associated with the module under calibration.

Abstract: A scanning-type optical antenna is provided, which includes a housing, a fine-tune mirror, a light signal emitter, a light signal receiver, a scanning light receiver and a rotational mechanism. The housing includes a window. The scanning light receiver disposed on the housing receives an input sector scanning light from a target antenna to generate plural light speckles. The rotational mechanism mounts the housing and adjusts the deflection angle between the housing and the target antenna according to the light speckles. The fine-tune mirror is disposed outside the housing and corresponding to the window. The light signal emitter inside the housing transmits an output signal light to the target antenna after being reflected by the fine-tune mirror through the window. The input signal light of the target antenna is transmitted to the light signal receiver inside the housing after being reflected by the fine-tune mirror and passing through the window.

Abstract: Exemplary embodiments of the present invention are directed to a system for monitoring, recording, and analyzing driver activity. An exemplary system comprises a sensor module configured to receive data from one or more sensors that measure acceleration or deceleration associated with a vehicle. A stop detection module is configured to receive the sensor module data, process the sensor module data, and determine an abrupt acceleration or deceleration event. A location module is configured to retrieve the location of the vehicle simultaneous with an abrupt acceleration or deceleration event. The system stores the location of the abrupt acceleration or deceleration event in an event record in an event database.

Abstract: An example system for multi-wavelength optical signal splitting is disclosed. The example disclosed herein comprises a first splitter, a second splitter, and a modulator. The system receives a multi-wavelength optical signal and an electrical signal, wherein the multi-wavelength optical signal comprises a plurality of optical wavelengths and has a power level. The first splitter is to split the plurality of optical wavelengths into a plurality of optical wavelength groups. The second splitter is to split the multi-wavelength optical signal or the plurality of optical wavelength groups into a plurality of lower power signal groups. The modulator is to encode the electrical signal into the plurality of optical wavelength groups, the plurality of lower power signal groups, or a combination thereof.

Abstract: A combined system for imaging and communication by laser signals including a telescope (10) in which the primary (1) and secondary (2) mirrors are shared between an imaging function and a function involving the emission of laser transmission signals. The accuracy required for the direction of emission (DE) of the laser transmission signals is obtained by additionally placing a geolocation device on board a satellite carrying the combined system. No coarse pointing assembly is used and it is also possible for the system to be devoid of any fine pointing assembly and target acquisition and tracking detector.

Abstract: Novel tools and techniques for point-to-point network service provisioning and mesh network transitioning are provided. A system includes a fiber injection node, host mesh network radio, and a first node. The first node may comprise a remote wireless transceiver in communication with the host wireless transceiver, a first mesh network node transceiver configured to communicate with other mesh network node transceivers, a processor, and non-transitory computer readable media comprising instructions executable by the processor. The first node may be configured to establish a point-to-point wireless connection to the host wireless transceiver of the fiber injection node, and provision access to the service provider network to the first customer premises. The first node may further be configured to establish a mesh connection to a secondary mesh network node associated with a second customer premises, and provision access to the service provider network to the second customer premises.

Abstract: An optical transceiver includes an optical transmitter, an optical receiver, a first processing unit for controlling a section of the optical transmission circuit, a second processing unit for controlling a section of the optical reception circuit, and a signal line. First and second memory regions constitute a MDIO register space. The selection signal is set to a first level when the first memory region includes a MDIO register, and alternatively is set to a second level when the second memory region includes the MDIO register. The first processing unit responds to another MDIO frame having an OP code set to other than “00h” when the selection signal is at the first level, and the second processing unit alternatively responds to the another MDIO frame when the selection signal is at the second level.

Abstract: A method for connecting nodes in a datacenter includes installing a first network node in a datacenter adjacent to at least a second network node. A wireless communication link is automatically established between the first network node and the second network node. A network is configured with the first network node, the second network node, and a third network node.

Abstract: An optical transmission device includes: a first drive unit that drives a VOA adjusting an attenuation amount for an optical signal from an optical amplifier; a second drive unit that drives an excitation light source of the optical amplifier; a first FF control unit that sets a first set value for the first drive unit and performs FF control; a second FF control unit that sets a second set value for the second drive unit and performs the FF control; a first control unit that controls the second drive unit in a manner that causes an optical output power from the optical amplifier to attain a first control target value; and a switch unit that switches to the first control unit when the optical output power corresponding to the second set value is attained as a result of FF control of the second FF control unit.

Abstract: A robust wireless communications network is deployed by retrofitting spatially distributed light sockets with integrated light/communicator modules. Each light/communicator module comprises an electric lamp and a communicator unit, the communicator unit having an RF transceiver, an antenna, and a Broadband processor for communicating with other nodes in the wireless communication network, using a suitable mesh network protocol. A power conversion unit is optionally provided in each integrated light/communicator module so that the individual components of the module may operate on the standard light socket power or selectably from other power sources.

Abstract: In order to enable flexible and efficient operations according to various electric power circumstances, a digital optical communication system 1 is provided with multiple optical transfer apparatuses 2, 3 and a communication control unit 4. The optical transfer apparatuses 2, 3 respectively house optical transmission/reception devices 10, 20 each including a reception-side waveform equalization processing unit 12 and a transmission-side waveform equalization processing unit 11 that perform, respectively on the reception side and on the transmission side, equalization processing for compensating waveform distortion that occurs on transfer paths 5, 6.

Abstract: High power, high speed VCSEL arrays are employed in unique configurations of arrays and sub-arrays. Placement of a VCSEL array behind a lens allows spatial separation and directivity. Diffusion may be employed to increase alignment tolerance. Intensity modulation may be performed by operating groups of VCSEL emitters at maximum bias. Optical communications networks with high bandwidth may employ angular, spatial, and/or wavelength multiplexing. A variety of network topologies and bandwidths suitable for the data center may be implemented. Eye safe networks may employ VCSEL emitters may be paired with optical elements to reduce optical power density to eye safe levels.

Abstract: Embodiments of the present invention disclose a method for switching a modulation format of a passive optical network, an apparatus, and a system. The method includes: separately delivering, by an OLT, a registration message to an optical network unit in all supported upstream modulation formats and/or downstream modulation formats; receiving, by the OLT, a first message reported by the optical network unit, where the first message includes an upstream modulation format capability and/or a downstream modulation format capability; and determining, by the OLT, a target upstream modulation format and/or a target downstream modulation format of the optical network unit according to the first message, and instructing the optical network unit to switch to the target upstream modulation format and/or the target downstream modulation format. Therefore, in a PON system that supports a plurality of modulation formats, a modulation format reporting capability of the ONU is improved.

Abstract: Apparatus for and method of transmitting an optical signal by a Free Space Optical, FSO, communication system, the method comprising: transmitting, by an optical signal transmitter (104), an optical signal (700) into at least part of a volume of an optical medium (302); and controlling, by a controller, the optical signal transmitter (104), to scan the at least part of the volume (302) using the optical signal (700) in a sequence of non-overlapping loops (704, 708). The sequence of non-overlapping loops (704, 708) may be a sequence of non-overlapping, concentric circular loops.

Abstract: An optical transceiver of the present disclosure includes: a first light emitting element configured to perform electric-optic conversion at a first transmission rate; a second light emitting element configured to perform electric-optic conversion at a second transmission rate higher than the first transmission rate; a light receiving element configured to perform optic-electric conversion at a predetermined transmission rate; an optical sub-assembly accommodating the light emitting elements and the light receiving element; a circuit board having a plurality of integrated circuits which are configured to drive the light emitting elements and the light receiving element; a housing accommodating the optical sub-assembly and the circuit board, the housing having a longest dimension in a longitudinal direction thereof and having thermal conductivity; a temperature sensor configured to detect a temperature inside the housing; a temperature control unit configured to determine a control value to be designated to th

Abstract: The disclosed system may include (1) an optical element that receives an optical beam, (2) a wide field-of-view (FOV) quadrant photodetector that receives, from the optical element, first light originating from the optical beam, (3) a narrow FOV quadrant photodetector that receives, from the optical element, second light originating from the optical beam, and (4) a controller that controls an orientation of the optical element during at least a period of time based on a weighted combination of (a) output of the wide FOV quadrant photodetector in response to the first light, and (b) output of the narrow FOV quadrant photodetector in response to the second light. Various other systems, methods, and computer-readable media are also disclosed.

Abstract: A method of allocating spectrum to a signal in a wavelength division multiplex network including a plurality of nodes, wherein the spectrum comprises a grid divided into a plurality of slots, including allocating to the signal a slot immediately adjacent to a second slot occupied by a second signal, wherein the signal and the second signal are both addressed to the same destination node, and wherein the slots allocated to the signal and the second signal form a spectrum block.

Abstract: A communication system is provided for transmitting a RF signal, which has a frequency band. The communication system comprises: a sigma delta modulator for modulating the RF signal into a broadband signal wherein the signal to noise ratio of the broadband signal is higher in the frequency band of the RF signal than outside the frequency band of the RF signal; an optical transmitter connected with the sigma delta modulator and with an optical fiber for transmitting the broadband signal over the optical fiber; a photo-detector configured for receiving the broadband signal from the optical fiber and converting it into an electrical signal; an output device and a matching circuit configured for power matching and/or noise matching of the photo-detector, at the frequency band of the RF signal, with the output device.