Abstract: Embodiments of the present disclosure provide a message transmission method, a relay device, and a message processor, so as to reduce maintenance costs. The method includes: receiving, by a relay device, a downlink message sent by a message processor, where the downlink message includes message content and an address of an ONU; obtaining, by the relay device according to the downlink message, an identifier of the ONU, corresponding to the address of the ONU; and sending, by the relay device, the message content to the ONU according to the identifier of the ONU.

Abstract: A self-organizing network of nodes communicates with uncollimated optical pulses. The nodes use low-power, unmoving, broad-beam optical interfaces, low-power processors, and communication algorithms based on timeslots within a timeframe. Nodes self-organize to form the network by pulsing detectors and sources to find neighboring nodes, confirm connections, transmit and store data, and exchange partner node identities. Two- or three-dimensional networks can thereby self-organize without external awareness of network topology, and can repair themselves when nodes move or fail. Node communication may be synchronous, thereby allowing for images of the environment status, and activation of the environment is possible via node stimulators. After forming a network, a cluster of nodes may be read out to provide data from node sensors.

Abstract: A method for controlling a transmit power of a terminal, and a terminal, where the method and the terminal include, working states of a first antenna and a second antenna may be monitored, and then a transmit power of the first antenna or that of the second antenna may be controlled according to a preset correspondence. Therefore, according to the method and the terminal, a transmit power of an antenna in a working state in the first antenna and the second antenna may be accurately controlled. If the transmit power is less than a standard transmit power, a Specific Absorption Rate (SAR) can be reduced.

Abstract: A pluggable module is provided for converting an optical signal to a plurality of electrical signals. The pluggable module may include a printable circuit board (PCB) and an optical connector disposed on a first side of the PCB. The optical connector may route any received optical signal to an optical to electrical transceiver. The optical to electrical transceiver may convert the optical signal to an electrical signal and route the electrical signal to an electrical connector mounted on a second, opposite side of the PCB.

Abstract: A wireless transmitter includes a signal processing circuit configured to generate a plurality of first and second spatial streams signals. The transmitter includes a frequency shift circuit configured to selectively apply different frequency shifts to the first and second spatial streams signals. A wireless receiver includes a frequency shift circuit configured to selectively apply different frequency shifts to the received first and second spatial streams signals. The receiver also includes a signal processing circuit configured to process the first and second frequency shifted signals.

Abstract: A transmitting device of the present disclosure include: a first driver that includes a first sub-driver unit which operates on a basis of a first control signal and a second sub-driver unit which operates on a basis of, of the first control signal and a second control signal, a signal selected through a first selecting operation, and is configured to be able to set a voltage at a first output terminal; and a controller that controls the first selecting operation.

Abstract: A system and method for securing communication over an optical fiber are disclosed. The system includes a transmit spatial multiplexer configured to couple optical signals into spatial paths of an optical fiber, a first of the plurality of optical signals is an optically modulated version of a desired sequence of information that is intended to be transferred over the optical fiber and it is coupled into a first of the spatial paths; a second one of the plurality of optical signals is an optical chaff signal and it is coupled into a second spatial path different from the first one, and a third optical signal is an optical signal for use by an optical time domain reflectometer (OTDR) that is coupled into one of the spatial paths of the optical fiber, whereby a tap along the fiber cannot determine the transmitted desired sequence of information.

Abstract: A visible light communication sensor is provided. The visible light communication sensor includes a sensing module, an image data readout circuit, and a visible light communication data readout circuit. The sensing module includes a plurality of pixel units arranged in an array. When the sensing module performs an image sensing operation, a first portion of the pixel units performs an image sensing operation, and the image data readout circuit is idle. When the sensing module performs a visible light communication operation, a second portion of the plurality of pixel units receives a visible light communication signal, so that the visible light communication data readout circuit outputs the visible light communication data, and the image data readout circuit performs an analog-to-digital conversion on a plurality of image sensing signals outputted by the first portion of the plurality of pixel units performed in the image sensing operation to output image sensing data.

Abstract: Provided are a method and system for allocating wavelength channels in a Passive Optical Network (PON), and an Optical Line Terminal (OLT). In the method, an OLT may acquire pre-set wavelength channel priority information and Optical Network Unit (ONU) priority information; and the wavelength channel priority information and the ONU priority information may be sent to each ONU to enable each ONU to selectively access a corresponding wavelength channel according to the wavelength channel priority information and the ONU priority information based on a pre-set rule.

Abstract: A method and device for acquiring Channel State Information (CSI) are provided. In the method, a second node receives a first-type signal and/or a second-type signal sent by a first node; the second node acquires CSI based on measurement of the first-type signal and the second-type signal, or based on measurement of the second-type signal only; the first-type signal may include a measurement Reference Signal (RS), and the second-type signal may include one of: a demodulation RS, a data sharing channel signal, and a signal combination of the data sharing channel signal and the demodulation RS; the second node feeds back the CSI to the first node.

Abstract: A direct conversion wireless transmitter includes IQ mismatch pre-compensation using direct learning adaptation to adjust IQ pre-compensation filtering. Widely-linear IQ_mismatch pre-compensation filtering compensates for IQ mismatch in the TX analog chain, filtering of input data x(n) to provide pre-compensated data y(n) with a compensation image designed to interfere destructively with the IQ_mismatch image. A feedback receiver FBRX captures feedback data z(n) used for direct learning adaptation. DL adaptation adjusts IQ_mismatch filters, modeled as an x(n)_direct and complex conjugate x(n)_image transfer functions w1 and w2, including generating an adaptation error signal based on a difference between TX/FBRX-path delayed versions of x(n) and z(n), and can include estimation and compensation for TX/FBRX phase errors. DL adaptation adjusts the IQ pre-comp filters w1/w2 to minimize the adaptation error signal. Similar modeling can be used for IQ mismatch.

Abstract: An estimating apparatus for bias drift of a transmitting end modulator, a compensating apparatus, a receiver and a method are disclosed. Estimation and compensation of the bias drift are performed directly at the receiving end according to phase recovered received signals, with no need of providing an extra bias control circuit at the transmitting end. Estimating and compensating for the bias drift includes recovering received signals by removing a frequency difference and a phase difference between a transmitting end laser and a receiving end laser producing phase recovered received signals, estimating the bias drift of the transmitting end modulator according to the phase recovered received signals and compensating the bias drift of the transmitting end modulator in a receiver.

Abstract: In one embodiment, a first optical network device includes a controller, and a first network interface, wherein the first network interface is configured to exchange data with a first layer 3 network device, and the controller is configured to obtain at least one optical circuit attribute including an optical circuit distance and/or an optical circuit latency of a first optical circuit in an optical network, and provide the at least one optical circuit attribute to the first layer 3 network device. Related apparatus and methods are also described.

Abstract: An apparatus includes a node situated to receive an odd-number X of input/output communication branches extending from respective ports, each communication branch including two input/output fiber pairs, and a 2·X degree ROADM coupled to the two input/output fiber pairs of each of the X ports and configured to reduce a wavelength blocking of traffic through the node that is associated with the odd-number X. Methods of directing communication signals to and receiving communication signals from communication nodes are also disclosed.

Abstract: A system and method for securing communication over an optical fiber are disclosed. The system includes a transmit spatial multiplexer configured to couple a plurality of optical signals into respective ones of a plurality of spatial paths of an optical fiber, each of the spatial paths being able to carry an optical signal; wherein at least one of the plurality of optical signals is an optically modulated version of a desired sequence of information that is intended to be transferred over the optical fiber; and wherein at least one of the plurality of optical signals is an optical chaff signal; whereby a tap along the fiber cannot determine the transmitted desired sequence of information.

Abstract: A method and device for adjusting a channel precoding matrix for one or more users operating in a virtualized Massive Multi-Input Multi-Output (M-MIMO) wireless network managed by a neutral host. Each of the users receive wireless services from one or more service providers (SP). For each service provider, a set of N antennas are selected from all available antennas managed by the neutral host. Channel information for each user of each service provider is obtained. A precoding matrix from each SP is defined according to each SP channel and state information. If all channel state information (CSI) parameters are known, and if the CSI parameters are all known, a final precoding matrix based on the known CSI is derived, whereas if only a subset of CSI parameters are known, a final precoding matrix based on the known subset CSI parameters is derived.

Abstract: Methods, systems, and devices for data encoding and channel hopping. The system includes a signal source for providing a signal. The system includes an optical switch having an input port and multiple output paths. The optical switch is configured to receive, at the input port, the signal. The optical switch is configured to route the signal to an output path of the multiple output paths. The system includes a mode converter that is connected to the optical switch and configured to select an orbital angular momentum (OAM) mode. The mode converter is configured to encode or channel hop the signal using the OAM mode and combine the signal from each output path. The system includes a transmitter configured to propagate the signal.

Abstract: Optical transmission systems and methods are provided herein. The system includes a modulator configured to impress an input radio frequency (RF) signal onto an input optical signal to generate a first modulated optical signal and a second modulated optical signal. The system also includes a signal adjustment controller configured to apply a delay to the first modulated optical signal or the second modulated optical signal, interleave the first modulated optical signal and the second modulated optical signal, and transmit the interleaved first and second modulated optical signals as one optical signal. The system also includes a single optical link coupled to the modulator and configured to carry the interleaved first and second modulated optical signals to a receiver.

Abstract: An orthogonalization matrix calculation circuit may include a scaling coefficient calculation circuit configured to calculate a scaling coefficient for each of a plurality of candidate update operations for the orthogonalization matrix, wherein each of the plurality of candidate update operations comprises combining linearly at least one of a first column or a second column of the orthogonalization matrix previously utilized to update the orthogonalization matrix, an update operation selection circuit configured to select an optimum candidate update operation from the plurality of candidate update operations, and a matrix update circuit configured to update the orthogonalization matrix according to the scaling coefficient of the optimum candidate update operation.

Abstract: A multiplexer inserts a dummy signal light into a main signal. A light intensity monitor acquires the intensity of the light of each wavelength of a light output from a wavelength selective switch. A light source controller controls the insertion of the dummy signal light into the main signal, and release of the insertion. A difference calculator calculates the difference between a first light intensity that has been acquired in a state in which the dummy signal light is inserted into the main signal and a second light intensity that has been acquired in a state in which the dummy signal light is not inserted into the main signal. An insertion loss calculator calculates an insertion loss in the wavelength selective switch based on the calculated difference. An insertion loss controller controls the insertion loss in the wavelength selective switch based on the calculated insertion loss.