Abstract: A service management method and apparatus for a passive optical network, an optical line terminal and a medium are disclosed. The method may include, maintaining communication with the OLT; acquiring optical network unit management control interface (OMCI) frame data transferred via the OLT; acquiring service information of the ONU according to the OMCI frame data; and performing the service management to the passive optical fiber network according to a network connection status between the OLT and the OMCI VNF, and service information of the ONU.

Abstract: A network, or part thereof for example a link, 1 is described. The network 1 is for data communication through a medium, preferably wherein the medium comprises and/or is, at least in part, a liquid medium LM. The network 1 comprises a set of transmitters 11, including a first transmitter 11A comprising a controller 110A, wherein the first transmitter 11A is configured to transmit a set of polarised optical signals S, including a first polarised optical signal S1 comprising first data D1 of set of data D. The network 1 comprises a set of receivers 12, including a first receiver 12A comprising a controller 120A, wherein the first receiver 12A is configured to receive the first polarised optical signal S1.

Abstract: An optical link system for computation, preferably including a photonics substrate and a plurality of electronics modules, such as processors, memory controllers, and/or switches, which are preferably bonded to the photonics substrate. A photonics substrate, preferably including a plurality of optical links including waveguides and optical transducers. A method for optical link system operation, preferably including operating electronics modules and using optical links, optionally in cooperation with electronics modules such as switches, to transfer information between the electronics modules.

Abstract: Systems, devices, and methods are provided for built-in redundancy in optical devices that output an optical signal, for example, to photonic integrated circuits. The device and systems disclosed herein include a plurality of optical sources coupled to a plurality of waveguides. Each adjacent pair of the plurality of waveguides are coupled to an optical switching devices that comprises an interferometer having a first branch comprising a phase-shift mechanism coupled to one waveguide of the pair of waveguides. A voltage bias can be applied to the phase-shift mechanisms to tune a respective phase difference and direct an optical signal from any of the plurality of optical sources to the output end of the optical device. According to various examples disclosed herein, the phase-shift mechanisms comprises metal oxide semiconductor (MOS) capacitors.

Abstract: A method for a scalable Reconfigurable Optical-Add Drop Multiplexer (ROADM) includes determining a plurality of channels at a ROADM node in an optical network will ingress and egress at another ROADM node in the optical network, such that the plurality of channels are able to share a same physical routing in the optical network; interfacing the plurality of channels at a degree in the ROADM node, such that the plurality of channels are connected to the another ROADM node in the optical network; adding and dropping the plurality of channels at the ROADM node with corresponding modems; and pre-combining the plurality of channels onto a common port between the degree and the corresponding modems, such that the plurality of channels connect to the degree together in a single connection. An add/channel count of the ROADM node is higher with the pre-combining.

Abstract: Described herein are wavelength division multiplexing (WDM) transceivers configured to support fast, bidirectional communication over optical channels. An optical transceiver comprises a transmitter, a receiver, an input/output (I/O) port and an optical interleaver. The transmitter comprises a first bus waveguide and a plurality of optical modulators coupled to the first bus waveguide, each of the optical modulators being resonant at a respective wavelengths in a first wavelength set. The receiver comprises a second bus waveguide and a plurality of optical filters coupled to the second bus waveguide, each of the optical filters being resonant at a respective wavelength in a second wavelength set. The (I/O) port is coupled to an optical channel.

Abstract: A signal converting apparatus includes a conversion unit, a measurement unit, and a control unit. The conversion unit performs FM batch conversion on an input signal containing a plurality of carrier signals, to generate an FM signal. The measurement unit measures the carrier levels of the plurality of carrier signals contained in the input signal, and the maximum frequency of the input signal. The control unit calculates the frequency deviation amount of the entire input signal, on the basis of the measured carrier levels of the respective carrier signals. Using the calculated frequency deviation amount and the measured maximum frequency, the control unit calculates a center frequency for the FM signal, and controls the conversion unit so that the center frequency of the FM signal to be generated by the FM batch conversion becomes equal to the calculated center frequency.

Abstract: In a wavelength selective switch, an input port transmits an input beam, and diffraction grating disperses the input beam into optical channels. A liquid-crystal-on-silicon (LCoS) switch assembly has a phase grating profile and has addressable pixels, which are liquid crystal based. The LCoS switch assembly can selectively direct first-order diffracted beams of the optical channels for output to selected output ports. A tunable optical wedge adjacent the LCoS switch assembly can direct higher-order diffraction beams in the space between the output ports to reduce crosstalk. The wedge is a liquid crystal cell having spaced-apart resistive layers and having liquid crystal material disposed between the layers. In the wedge, the liquid crystal material can produce a phase profile in response to bias voltages applied to the resistive layers, and a beam steering angle of the phase profile can direct at least the second-order diffracted beams towards the port spacing between the ports.

Abstract: A fiber optic communication system may include a transmitting subsystem, a receiving subsystem, a power monitoring subsystem, a temperature monitoring subsystem, an alarm subsystem, and a data logging subsystem. The transmitting subsystem may be configured to transmit optical signals encoding data into an optical path. The receiving subsystem may be configured to receive the optical signals transmitted by the transmitting subsystem and decode the data encoded in the optical signal. The power monitoring subsystem may be configured to measure a power of the optical signal during normal operations. The temperature monitoring subsystem may monitor the temperature of the fiber optic communication system at various locations. The alarm subsystem may generate an alarm if the system operates outside of certain thresholds. The data logging subsystem may log the measured temperatures and optical signal power of the fiber optic communication system.

Abstract: An optical transmitter can generate probabilistically shaped quadrature amplitude modulation (PS-QAM) signaling for transmission over a fiber to a destination without optical amplification. The single fiber can transmit the PS-QAM signaling using dense wavelength division multiplexing having a relatively large number of channels that are closely spaced. A coherent receiver can receive the PS-QAM signaling for decoding without implementing chromatic dispersion compensation.

Abstract: A network management system can be configured to identify routes for satisfying a set of demands on an optical communication network using layer graph(s). The layer graph edges can have edge scores that indicate a cost of the edge. The network management system can generate the layer graph(s) using a network graph that represents the optical communication network and an associated sets of available frequency slots. The network management system can iteratively identify candidate path(s) on the layer graph(s) that correspond to each of the demands and determine a cost for each candidate path using the edge scores. In each iteration, the network management system can select the lowest cost candidate path, update the layer graph(s) based on this selection, and update the candidate paths for the remaining demands as needed. The network management system can similarly generate restoration paths for each of the demands.

Abstract: A method for distributed allocation of data paths in an optical network (100) including optical switches (30, 32, 130) connected by optical links (44, 140), includes receiving a request for a data path for connecting a source node (10) and a destination node (20). In in response to the request, one or more queries are sent, the queries corresponding to one or more candidate optical circuits that connect the source node and the destination node, the queries requesting one or more processors (230) to configure the optical switches along the candidate optical circuits to reserve optical channels on the optical links of the candidate optical circuits for the requested data path. An optical circuit is identified from among the candidate optical circuits, in which all the optical channels for the requested data path have been reserved successfully. The requested data path is established over the identified optical circuit.

Abstract: Provided is an optical communication device including: a multiplexer configured to multiplex one or more input optical signals to output a single first optical signal; a signal generator configured to generate a second optical signal having a preset wavelength; a filter configured to generate a third optical signal by combining the first optical signal and the second optical signal; a switch configured to connect any one of a plurality of optical cables connected to the switch with the filter to transmit the third optical signal through any one of the plurality of optical cables; and a controller configured to control the switch by analyzing reflected light of the second optical signal.

Abstract: A fiber link system and method for masking signals on a fiber link system. The system includes sending a desired sequence of information in the form of a true optical signal that is typically intended to be transferred between legitimate users at both ends of a link over a center core of a the spatially multiplexing optical fiber that is a multicore fiber. Optical chaff signals, or subterfuge signals, are sent alongside the true signal in at least one, non-center core of the spatially multiplexing optical fiber to mask such true signal in the fiber cable from intruders tapping into the fiber cable. At least one of the chaff signals occupies substantially a same optical frequency range as the true signal. The optical signals may be coupled into the multiplexing optical fiber using a transmit spatial multiplexer.

Abstract: There is described a reconfigurable array for facilitating dynamic combination and distribution of RF signals.

Abstract: Techniques, methods and system, for synchronization of sparse data signals are disclosed, comprising mixing a serial stream of sparse data signals with a serial stream of synchronization signals, to thereby add redundancy to the serial stream of sparse data signals and enable clock regeneration from a serial stream of mixed signals produced by said mixing, emulating the serial stream of synchronization signals by applying the clock regeneration to the serial stream of mixed signals, and generating a stream of parallel synchronization signals having a frequency of the serial stream of synchronization signals, deserializing the serial stream of mixed signals into a stream of parallel mixed signals having a data rate lower than a data rate of the serial signal streams, and demixing the stream of parallel synchronization signals with the stream of parallel mixed signals and thereby removing the redundancy introduced by the mixing into the sparse data signals and generating a parallel stream of demixed signals sub

Abstract: The disclosed systems and methods are for monitoring optical performance in a spatial division multiplexing (SDM) system, comprising: i) extracting, by an optical coupler, at least a portion of a plurality optical signals propagating in different communication lanes of the SDM-based optical communication system, wherein each optical signal of the plurality of optical signals is modulated with a distinguishable pilot tone (PT) signal; ii) combining, by the optical coupler, the extracted portion of the plurality of optical signals, and generate a combined optical signal; iii) extracting, by a pilot tone detector (PTD), PT signals from the combined optical signal; iv) determining, by the PTD, optical signal specific information included in the PT signals; and v) computing, by the PTD, optical power of each optical signal based on the optical signal specific information.

Abstract: The present disclosure is directed to a user friendly removable AOC over fiber connection system that simplifies consumer installation and maintenance for optical transmission of high-speed uncompressed video and data over long distances, including a removable optical transmitter and a removable optical receiver. The optical transmitter including a transmitting circuitry configured to receive electrical or optical signals from a source device; at least one laser configured into the transmitting circuitry for converting the electrical signals into light signals; it can be present but is not mandatory an interface electrically connected to the transmitting circuitry and configured to connect the transmitting circuitry to the source device; and one or a plurality of optical connectors connected to the transmitting circuitry for receiving the light signals, the optical connectors configured to removably connect to a plurality of transmitting optical fibers for transmitting light signals.

Abstract: Provided is a monitoring apparatus capable of efficiently optimizing the transmission efficiency of an entire network. The monitoring apparatus (1) includes a variable parameter changing unit (2), a monitoring information acquisition unit (4), and an estimation unit (6). The variable parameter changing unit (2) changes a variable parameter for at least one of multiple network apparatuses that constitute an optical communication network transmitting an optical signal by wavelength division multiplexing. The monitoring information acquisition unit (4) acquires monitoring information related to a state of optical communication from at least one of the multiple network apparatuses. The estimation unit (6) estimates at least one penalty for a receiving side, using the monitoring information.

Abstract: An optical wireless communications receiver for a portable communications device, the receiver being configured to receive radiation signals on which communication data is encoded, wherein the receiver is comprised in or on or configured for mounting to at least part of a periphery or edge of the device. Advantageously, the optical wireless communications comprises a plurality of, receiver elements distributed along or around the receiver and/or comprises an optical guide configured to receive radiation and convey at least part of the radiation along the optical guide to at least one of the receiver elements.