Abstract: A method of communication includes notify, by an optical line terminal (OLT), an optical network unit (ONU) a first time period assigned to a first power saving operation and a second time period assigned to a second power saving operation, and perform, by the OLT, the second power saving operation for a receiver of the OLT during the second time period and the first power saving operation for a transmitter of the OLT during the first time period.

Abstract: A optical transmission device that includes a light source, a spatial light modulator including a modulation part where a plurality of modulation regions that is irradiated with light emitted from the light source is set, a wave plate disposed in an optical path of modulated light that is modulated in each of the modulation regions set in the modulation part of the spatial light modulator, the wave plate converting the modulated light that is modulated in each of the modulation regions to mutually different polarization states, and a curved surface mirror having a curved reflection surface irradiated with the modulated light that is converted to the mutually different polarization states, the curved surface mirror reflecting the modulated light converted to the mutually different polarization states at a projection angle in accordance with a curvature of the reflection surface.

Abstract: The present disclosure relates to the technical field of campus local area networks (LANs), and particularly discloses a method and system for implementing multi-service bearer in a passive optical LAN (POL). The method includes: step S1: constructing a POL, and accessing an entire campus network at a bandwidth of Gigabit according to a point-to-multipoint star topology including three layers: a core layer, a convergence layer, and an access layer, to form a 10 Gbit backbone, wherein an optical network terminal enters a room and is deployed according to such a manner that one classroom or functional room has one terminal mode; step S2: planning and managing the entire POL, defining a plurality of LANs through software definition (SD-LAN), wherein different LANs bear different services; and step S3: allocating different service bandwidths to different LANs through a sharding mechanism of the PON, and the like.

Abstract: A transmission apparatus repeatedly inserts reference signal sequences into a transmission signal sequence at different timings, and converts the transmission signal sequence, into which the reference signal sequences are inserted, into an optical signal. The reception apparatus includes a detection unit, a waveform equalization unit, and a signal quality measurement unit. The detection unit receives the optical signal transmitted through an optical transmission line, and converts the received optical signal into a reception signal of an electrical signal. The waveform equalization unit performs waveform equalization on the reception signal converted into the electrical signal. The signal quality calculation unit extracts a reception signal sequence set in each section corresponding to the reference signal sequence from the received signal on which waveform equalization performed.

Abstract: A light-emitting assembly includes a laser, an optical isolator, and a polarization maintaining device. The laser is configured to emit a first optical signal; the polarization maintaining device is configured to receive a second optical signal; and the optical isolator includes a polarizer and an optical rotator. The laser, the polarizer, the optical rotator, and the polarization maintaining device are sequentially arranged, a polarization direction of the polarizer is the same as a polarization direction of the first optical signal, and the optical rotator is configured to deflect the first optical signal into the second optical signal.

Abstract: A computer architecture has a global optical waveguide, a buffer having memory space having a memory hierarchy above main memory for temporary data storage. A transmitter transmits a first optical signal with a first plurality of optical wavelengths on the global optical waveguide, and a second optical signal with a second plurality of optical wavelengths on the global optical waveguide. A receiver receives a second optical signal with a third plurality of optical wavelengths from the global optical waveguide. One or more local optical waveguide(s) are coupled to the global optical waveguide to receive all of the first plurality of optical wavelengths and a unique wavelength of the second plurality of optical wavelengths and transmit a unique wavelength of the third plurality of optical wavelengths.

Abstract: An aspect of the present invention is a communication route allocation device including a route possibility extraction unit configured to extract connectable possible routes on the basis of utilization condition information of a network from among optical path routes connecting start points to end points of optical paths accommodating communication demand in the network, a core selection unit configured to select a core, a link, and the optical path route to accommodate the optical paths by leveling wavelength utilization conditions over the entire network on the basis of utilization condition information of multicore fibers of all links in the network or the possible routes, and a wavelength selection unit configured to select a wavelength to be used for the core, the link, and the optical path route selected by the route possibility extraction unit and the core selection unit.

Abstract: An optical module includes a transmitter assembly; a receiver assembly; and circuitry connected to the transmitter assembly and the receiver assembly, wherein the circuitry includes one or more delay elements each configured to add a respective configured amount of delay in one or more of a transmit direction and a receive direction within the optical module. The optical module includes (1) a transmit direction from a host device through the circuitry and the transmitter assembly, and (2) a receive direction to the host device from the receiver assembly and through the circuitry. The one or more delay elements can be configured to introduce a delay in one or both directions to minimize the delay uncertainty associated with the optical module as well as the delay uncertainty on a given link (connection formed between two optical modules).

Abstract: Software-defined networking and network function virtualization constructs are leveraged across diverse portions of 5G network infrastructure including radio access network, mobile core, and wide area network to enable a security property to be implemented for a network slice from end-to-end to provide for strong logical and/or physical isolation of slice traffic from other network traffic. One or more network slice controllers are implemented in the 5G network that are interoperable as separate elements, or under centralized control, to enable the underlying diverse network infrastructure to be abstracted and virtualized so that infrastructure properties can be mapped across infrastructure types for the end-to-end slice.

Abstract: There is herein provided a method of controlling the frequency of operation of a component of a telecommunications network, the method including combining a first signal and a second signal to form a heterodyne signal, transmitting the heterodyne signal from a first node of the telecommunications network, detecting the transmitted heterodyne signal at a second node of the telecommunications network, and controlling a frequency of operation of a component of the telecommunications network using a frequency of the detected heterodyne signal.

Abstract: Provided are apparatus and method for slicing resources in passive optical network systems. The method includes identifying network elements included in a plurality of physical passive optical networks (pPONs), abstracting the identified network elements so that the identified network elements are recognized as the same software (SW) block, generating a plurality of PON slices by performing PON slicing on the abstracted network elements in accordance with a predetermined reference, and generating a plurality of virtual PONs (vPONs) by mapping the plurality of PON slices to at least one network element. The predetermined reference is determined on the basis of an attribute of at least one of ports and transmission containers (T-CONTs) corresponding to the identified network elements, and the at least one network element includes an optical network unit (ONU).

Abstract: The invention herein is a method for transferring data between a docking station and a user device via LiFi. The docking station/user device comprises at least one LiFi transceivers, and the user device/docking station comprises at least one LiFi transceiver. The method comprising the steps of acquiring by the docking station/user device a first communication channel transfer property, the first communication channel being between a first LiFi transceiver of the docking station/user device and a first LiFi transceiver of the user device/docking station. Acquiring by the docking station/user device a second communication channel transfer property, the second communication channel being between a second LiFi transceiver of the docking station/user device and the first LiFi transceiver of the user device/docking station.

Abstract: Disclosed is a signal processing method for a distributed acoustic sensing system (DAS), including receiving a set of scattered signals, each of which was scattered at a different location along an optical path and corresponds to a respective spatial channel. Each scattered signal is interfered with a local oscillator signal, and processed to generate a complex carrier signal whose modulation is related to an instantaneous frequency of an acoustic modulation at the scattering location. In order to improve the signal-to-noise ratio (SNR), complex carrier signals from multiple spatial channels are summed together, so that an instantaneous frequency corresponding to those channels can be estimated. The generation each complex carrier signal involves using a reference complex carrier signal for that channel. When the estimated instantaneous frequency corresponding to a set of spatial channels fulfils a predetermined condition, the reference complex carrier signal for those spatial channels is updated.

Abstract: In-network Optical Inference (IOI) provides low-latency machine learning inference by leveraging programmable switches and optical matrix multiplication. IOI uses a transceiver module, called a Neuro Transceiver, with an optical processor to perform linear operations, such as matrix multiplication, in the optical domain. IOI's transceiver modules can be plugged into programmable packet switches, which are programmed to perform non-linear activations in the electronic domain and to respond to inference queries. Processing inference queries at the programmable packet switches inside the network, without sending them to cloud or edge inference servers, significantly reduces end-to-end inference latency experienced by users.

Abstract: Various example embodiments for providing a passive optical network (PON), supporting communications between an optical line terminal (OLT) and a set of optical network units (ONUs) of a PON, are presented. The PON may be enabled based on use of an optical frequency comb (OFC), generated at the OLT and reconstructed at the ONUs for locking the OFC at the ONUs to the OFC at the OLT. The OFC may include a set of optical frequency lines used as seed lines for reconstruction of the OFC at the ONUs (e.g., the pair of OFC lines at the center of the OFC which may be used to regenerate locked OFCs at the ONUs), a set of optical frequency lines used to support downstream communications from the OLT to the ONUs, and a set of optical frequency lines used to support upstream communications from the ONUs to the OLT.

Abstract: A communication device includes a first laser driver, a second laser driver, a light emitting and receiving component, and a processor. The light emitting and receiving component is connected to a passive optical network to send and/or receive an optical signal. The light emitting and receiving component converts the optical signal into a first electrical signal and outputs the first electrical signal to one of the first laser driver and the second laser driver. One of the first laser driver and the second laser driver converts the first electrical signal into a second electrical signal, and outputs the second electrical signal to the processor. The processor disables another one of the first laser driver and the second laser driver.

Abstract: An optical imager with subcarrier multiplexing uses a source transmit beam to simultaneously emit SFM transmit beams towards a target and receives SFM receive beams reflected off the target. The SFM receive beams are combined to provide a total receive beam, and the total receive beam is combined with a reference beam having the same frequency modulation as the source transmit beam to provide a receive signal that is configured for extraction of image data associated with the target.

Abstract: An optical communication system includes a sending device, an optical cross-connect (OXC) device, and a first receiving device. The sending device is configured to send a modulated first service optical signal to the OXC device. The OXC device is configured to receive the modulated first service optical signal through a first input port, and divide the modulated first service optical signal into N1 first optical signals based on a wavelength. The OXC device is configured to send M1 first optical signals to the first receiving device through M1 first output ports.

Abstract: An optical communication device may include a driver component, arranged to achieve a driving voltage, and a modulator component, including a laser or arranged to receive light from a laser. The modulator component may be arranged to achieve a modulated light signal modulated based on the driving voltage. The device may include a transmission line arranged to transfer the driving voltage between the driver component and the modulator component. The transmission line may not impedance matched to the driver component, the transmission line may have an impedance which is at least 20% lower than an output impedance of the driver component, and the transmission line may be impedance matched with respect to signal reflections to the modulator component.

Abstract: A frequency domain filter receives an input signal in a frequency domain being blocked by an overlap-save method. The frequency domain filter multiplies the input signal in the frequency domain by a coefficient for each frequency. A coefficient updating unit adaptively updates a filter coefficient of the frequency domain filter. A constraint operation unit performs an operation of a constraint on a filter coefficient of the frequency domain filter in such a way as not to be affected by distortion caused by wraparound from both ends of a block to the output signal. A frequency at which the constraint operation unit performs the operation of the constraint is lower than a frequency at which the coefficient updating unit adaptively updates the filter coefficient of the frequency domain filter.