Abstract: A coexistence element within a passive optical network (PON) includes a housing having a plurality of input communication ports. Each input communication port is configured to receive, via a separate optical fiber, optical communications each having a wavelength within a particular wavelength band corresponding to a particular optical service. At least one of the input communication ports is configured to receive optical communications having wavelengths within two or more different wavelength bands. The housing also includes an output communication port configured to transmit, via a single optical fiber, the optical communications from each of the plurality of input communication ports.

Abstract: Some wireless communications systems may utilize optical wireless communication (OWC) to transmit or receive information. For instance, a first device may communicate with a second device via an OWC link. Some OWC systems may operate in an optical spectrum between approximately 1011 and 1016 hertz. Some examples of the techniques described herein may provide communication performance improvements by utilizing frequency-dependent communication structures for OWC. For example, frequency-dependent constellation patterns may be utilized for a codeword. Utilizing frequency-dependent constellation patterns may contrast with some approaches that utilize one modulation and coding scheme (MCS) per codeword. In some aspects, allocated frequency domain resources may be arranged into subbands with different MCSs. In some examples, an optical channel with relatively little or no fading may allow streamlining of channel state or control signaling. For example, MCS patterns may be updated relatively less frequently.

Abstract: A signal processing apparatus (10) according to the present disclosure includes: an overlap-type FFT processing unit (11) that performs FFT processing overlapping input subcarrier signals each other for each of FFT blocks, and a generation unit (12) that generates a signal which is obtained by frequency shifting the subcarrier signals that have been subjected to the FFT processing by the overlap-type FFT processing unit (11) by a frequency shift amount of a subcarrier, a phase offset that occurs between the FFT blocks overlapping each other being compensated in the signal.

Abstract: This application provides a data transmission method, a radio frequency unit, a baseband unit, and a communication system. The baseband unit includes: a multi-wavelength integrated light source, configured to generate a first optical carrier and a second optical carrier that have different wavelengths; a first modulator, configured to modulate downlink data sent to the first radio frequency unit to the first optical carrier, to obtain a first downlink optical signal; a second modulator, configured to modulate downlink data sent to the second radio frequency unit to the second optical carrier, to obtain a second downlink optical signal; and a multiplexer/demultiplexer, configured to multiplex the first downlink optical signal and the second downlink optical signal into a downlink combined optical signal and send the downlink combined optical signal.

Abstract: An optical communication system and a method. The system includes a distributed acoustic sensing (DAS) interrogation unit. The DAS interrogation unit is configured to generate one or more optical signals for determining a status of one or more portions of an optical communication path, modulate one or more optical signals using one or more measurement pulses and generate one or more modulated optical signals, and transmit one or more modulated optical signals to the one or more portions of the optical communication path. The status of one or more portions of the optical communication path is determined based on one or more reflected signals reflected by one or more portions of the optical communication path in response to one or more modulated optical signals.

Abstract: A communication system that includes a master communication device, a service communication device, and passive optical routing devices is provided. The master communication device obtains first signal from data source or modem and directs first laser beam carrying the first signal in a downstream path to the service communication device directly or via the plurality of passive optical routing devices. The service communication device demodulates the first signal from the first laser beam, re-modulates the demodulated first signal into a plurality of different radio frequency (RF) signals associated with different communication protocols having different communication ranges, and serves a plurality of end-user devices based on wireless communication capabilities of the plurality of end-user devices and the re-modulation of the demodulated first signal into the plurality of different RF signals.

Abstract: An optical communication fiber link including a monitoring system connected to an optical fiber transmitting electromagnetic radiation including a communication. The monitoring system includes a detection system detecting a scattering of the electromagnetic radiation from the optical fiber. The monitoring system monitors the scattering for an abnormal change and determines, from the abnormal change, an absence or a presence of a fault in the optical fiber.

Abstract: Embodiments of the present disclosure relate to devices, methods, apparatuses and media for communication. A device for communication is configured to generate target data for the optical network unit based on template data for an optical network unit set and instance data for an optical network unit in the optical network unit set. The device is further configured to perform validation on the target data of the optical network unit. In this way, an optical network unit data validation solution that supports an optical network unit to use template data is provided, which can significantly improve the validation speed of optical network unit data.

Abstract: A method includes generating first and second optical carrier signals having a specified frequency offset. The method also includes modulating an RF input signal onto a portion of the first optical carrier signal to generate modulated optical signals, where the modulated optical signals include the portion of the first optical carrier signal and sideband signals. The method further includes suppressing the portion of the first optical carrier signal in the modulated optical signals to generate carrier-suppressed single sideband signals. The method also includes optically filtering the carrier-suppressed single sideband signals to generate filtered carrier-suppressed single sideband signals. The method further includes combining the filtered carrier-suppressed single sideband signals with portions of the second optical carrier signal to generate frequency-converted optical signals. In addition, the method includes generating an output RF signal based on the frequency-converted optical signals.

Abstract: An aspect of the present invention is an optical transmitter including: a first modulation unit configured to generate an optical modulated signal through intensity modulation of an optical signal; a second modulation unit configured to generate an optical modulated signal through phase/frequency modulation of the optical signal; and a modulation scheme switching unit configured to switch a modulator of the optical signal to one of the first and second modulation units. The modulation scheme switching unit switches the modulator to a modulation unit corresponding to a device of a connection destination between the first and second modulation units.

Abstract: A data center interconnect (DCI) includes a downstream (DS) transceiver array including one or more DS transceivers. The DCI further includes a first comb source in operable communication with the US transceiver array. The first comb source is configured to generate one or more first spaced optical signals. The DCI further includes an upstream (US) transceiver array including one or more US transceivers in operable communication, over an optical communication medium, with the one or more DS transceivers, respectively, of the DS transceiver array. The DCI further includes a second comb source in operable communication with the US transceiver array. The second comb source is configured to generate one or more second spaced optical signals.

Abstract: An optical transmitter capable of colorless WDM includes a source of optical frequency comb (OFC) light having a plurality of separate optical frequency tones, and a plurality of optical modulators connected in parallel to modulate different parts of the OFC light with corresponding modulating signals, each of the parts including the plurality of separate optical frequency tones. An optical combiner combines the different parts of the OFC light to obtain an output optical signal of the optical transmitter. MIMO processing may be used to recover the modulating signals at an optical receiver using, or to configure the modulating signals at the transmitter so that each of the frequency tones is modulated with a corresponding target data signal.

Abstract: According to an aspect, a flexible node design for a high-degree ROADM is provided. In an embodiment, this design is implemented as a network node. The network node includes a plurality of optical input and a plurality of optical outputs. The network node further includes a MEMS (or other Optical Cross Connect, OXC) component and a WSS component, where each of the OXC and the WSS component has a set of inputs of the plurality of optical inputs and a set of outputs of the plurality of optical outputs. In some embodiments, the network node has a set of add inputs supported by one or both of the OXC and WSS components. In some embodiments, the network node has a set of drop outputs supported by one or both of the OXC and WSS components.

Abstract: In order to perform data transfer efficiently in an electro-optical hybrid switch network, monitor data that is a blocking rate in an optical line switching network, an amount concerning flows transferred by a connection apparatus to an electric packet network, a buffer utilization state in telecommunication devices within the electric packet network, or packet transfer latency or the like in telecommunication devices is obtained, and based on the monitor data, a threshold for distinguishing a first flow to be transferred by the connection apparatus through the optical line switching network from a second flow to be transferred by the connection apparatus through the electric packet network is changed, wherein the threshold is to identify, as the first flow, a flow that has a size exceeding the threshold and identify, as the second flow, a flow that has a size that is equal to or less than the threshold.

Abstract: A sub-carrier multiplexing (SCM) system include a digital layer including circuitry configured to interface with a client via a client signal and to interface with a media layer via a plurality of constituent signals, that together comprise the client signal; and the media layer including sub-carrier multiplexing (SCM) with each sub-carrier configured to carry one of the plurality of constituent signals. The client signal can be an Ethernet signal, Optical Transport Network (OTN) signal, etc., and the plurality of constituent signals can be Flexible Ethernet (FlexE) layer signals, Flexible OTN (FlexO) layer signals, Metro Transport Network (MTN) layer signals, ZR layer signals, etc.

Abstract: A transmitting device for transmitting a broadband optical transmission signal via an optical waveguide, having an electronic subsystem and an optical subsystem, the optical subsystem has N electro-optic modulators for providing N optical signal components, where N is a number greater than 1, the electronic subsystem is configured to transform a baseband signal by a Fourier transform, or a discrete Fourier transform, into a frequency spectrum containing N digital coefficient signals, and to provide, on a basis of the N digital coefficient signals, N analog coefficient signals, and the electro-optic modulators of the optical subsystem are configured to be driven each by one of the N analog coefficient signals.

Abstract: A cloud-based infrared signal protocol detector that is able to detect signal protocols for infrared-controlled devices and appliances and is able to generate new signal models for infrared signal protocols that cannot be detected. In an embodiment, the cloud-based infrared signal protocol detector comprises a signal capture and processing circuit, a cloud-based service comprising a signal protocol detector, an IR signal database comprising one or more signal models, and a new signal model manager.

Abstract: A wireless communication method in a wireless communication system including an exchange device and a base station device that performs beamforming according to the control of the exchange device, in which: the exchange device performs beamforming control of the base station device by transmitting an optically modulated signal to the base station device via an optical transmission line, the optically modulated signal being generated by modulating an intensity of an optical signal on a basis of a transmission signal to be transmitted by controlling any combination of an optical wavelength, a frequency, and an optical polarization or controlling the frequency; and the base station device performs beamforming in a direction in which a wireless signal radiated from an antenna to which an electrical signal based on the optically modulated signal has been input is reflected by a reflector or is transmitted through a lens among antennas corresponding to the number of combinations of the optical wavelength, the frequ

Abstract: The present disclosure is a base station system S that connects each of base station functional units that provides each of radio schemes and each of antenna units in each of provision areas via an optical fiber section, the base station system including passive light functional units disposed between each of base station functional units and each of antenna unit and including each downlink signal output port to which each downlink signal wavelength is allocated and each uplink signal output port to which each uplink signal wavelength is allocated and an optical switch disposed between each of the antenna units and the passive light functional units, accommodates some of each of the radio schemes, and switches to which one of the provision areas the some of the radio schemes are provided.

Abstract: The present invention relates to a method for dual-polarisation SDM transmission over optical fibre. The transmission method uses specific I/Q coding for combating the effects of PDL. The modulation symbols to be transmitted on the 2N polarisation states of the N wavelengths are broken down into real values and imaginary values (220). A first orthogonal linear transformation (230-1) is applied to the vector of the real values thus obtained and a second orthogonal linear transformation (230-2), separate from the first, is applied to the vector of the imaginary values thus obtained. A complex scalar solving an irreducible polynome of [X] in is multiplied with the first or second transformed vector before the two transformed vectors are summed (240) in order to provide a vector of transmission symbols for modulating the different states of polarisation of the spatial elementary channels.