106results about "Time-division optical multiplex systems" patented technology

The invention relates to the technical field of underground structure management, in particular to an underground structure full life cycle management method and system based on fusion sensing data. According to the technical scheme, the system comprises a sensing layer, a data transmission layer, a data processing and analysis layer and a decision support and application layer. Through cooperation of the distributed optical fiber sensor and the multiple sensors, all-around and multi-parameter monitoring of the underground structure is achieved, the monitoring accuracy and reliability are improved, historical data and operation rules of the structure are automatically learned through a data driving prediction model, different geological environments and load conditions are adapted, a scientific basis is provided for maintenance decision making, and meanwhile, the system has good application prospects. The self-adjusting capability is realized; monitoring system application and data accumulation and utilization in each stage are considered, seamless connection and cooperative work are achieved, full-life-cycle integrated management is achieved, the overall performance of the structure is improved, the service life of the structure is prolonged, the maintenance cost is reduced, and sustainable development is promoted.

The invention discloses a PON-based multi-protocol communication method and device, and the method comprises the steps: distributing a corresponding internal scheduling time slot to each network protocol processing unit for data uploading to each network protocol processing unit when a data processing module detects that the network protocol processing units connected with each field bus device have to-be-uploaded service data; and when one internal scheduling time slot is used up, interrupting the uploading of the service data until the next internal scheduling time slot allocated to the internal scheduling time slot is recovered from interrupting the uploading of the data. And the PON module monitors a global scheduling time slot allocation instruction issued by the optical line terminal in real time, converts an uploaded data frame into an electric signal, transmits the electric signal to the optical module through an internal link, converts the electric signal into an optical signal through the optical module in an allocated global scheduling time slot, and uploads the optical signal to the optical line terminal through an optical distribution network. Real-time performance and orderliness of transmission of service data in multiple field bus devices in a PON network are achieved, the requirement of industrial communication for data transmission is met, and transmission resource distribution is optimized.

The invention discloses a ranging communication fusion miniaturized system and method based on single photon detection. The system adopts a time division multiplexing common-path structure, and a ranging pulse sequence and a communication pulse sequence are sequentially transmitted in the same detection period to form a PPM modulation laser pulse chain. A single-photon detector is adopted to receive signals, background light interference is suppressed by combining a narrow-band filter and a time gating technology, and the type and boundary of a pulse sequence are identified through a signal demodulation and discrimination module. When the distance measurement pulse sequence is identified, the distance measurement path realizes distance measurement based on the round-trip time of the distance measurement pulse in the period; when a communication pulse sequence is identified, the communication path demodulates the PPM communication data. The method effectively decouples the contradiction between the distance measurement fuzzy and the communication rate, supports communication pulse high repetition frequency modulation while realizing non-fuzzy distance measurement, improves the distance measurement precision and the communication rate, and is suitable for free space communication, mobile robot platforms and other application scenes.

A method for monitoring an optical distribution network (ODN) in a passive optical network (PON), comprises establishing at least one data channel between an optical line terminal (OLT) and at least one optical network unit (ONU). The at least one ONU receives a live data traffic signal on at least one of the at least one data channel. The at least one ONU monitors the live data traffic signal for one or more abnormalities. The at least one ONU transmits an alert to the OLT when one or more abnormalities is detected.

An embodiment mixes classical and quantum signals in the same transmission such that an eavesdropper can be detected using the quantum signals while maintaining high classical transmission rates. The embodiment uses security enhancement from quantum signals while maintaining the high data rates of classical communication. The eavesdropper introduces noise when trying to collect information on the physical layer. This noise can be observed by monitoring the quantum signals.

A communication system includes an aggregate station configured to transmit and receive a signal and N extension stations (N is an integer of 2 or more). The N extension stations include a first extension station configured to receive a signal from the aggregate station and transmit a signal to a second extension station, an ith extension station (i is an integer satisfying 2 ≤ i ≤ N-1) configured to receive a signal from an (i-1)th extension station and transmit a signal to an (i+1)th extension station, and an Nth extension station configured to receive a signal from an (N-1)th extension station. A ratio between a magnitude of a signal to be received by an ith extension station (1 ≤ i ≤ N-1) and a magnitude of a signal to be transmitted thereby is (N-i+1):(N-i).

An optical communication device includes a signal multiplexing unit that multiplexes a plurality of client signals and a signal transmission unit that converts a first multiplexed signal obtained by the multiplexing to an optical signal and transmits the optical signal. The optical communication device is a device capable of receiving data traffic greater than data traffic corresponding to a predetermined communication bandwidth.

Provided herein is a probe for treating an eye of a patient. In one or more embodiments, the probe includes a body, and a tubular element having a main lumen extending from the body, the tubular element comprising a distal end. The probe further includes a visualization optical fiber within the main lumen, the visualization optical fiber adapted to emit an illumination provided by at least one of a plurality of light sources connected to the visualization optical fiber. In some embodiments, the probe further includes an optical switching system (e.g., a time-division multiplexor) operable with the plurality of light sources, wherein the optical switching system is adapted to independently control each of the plurality of light sources. By providing time-division multiplexing between different surgical light sources, quasi-simultaneous illumination delivery through the same optical path may be achieved.

A coherent transmitter (100, 200) for use in a time division multiple access (TDMA) system is operated in multiple states to enable coherent burst transmission. In an OFF state, the transmitter (100, 200) generates a dummy laser output (fd) from either a dummy laser (102) or an active laser (52) tuned to a dummy frequency different from an active frequency (fa), thereby maintaining thermal and bias stability without adding excess power on an upstream channel (22). In an ON state, the active laser (52) produces an active laser output (fa) that is modulated by a quad-parallel Mach-Zehnder (QPMZ) modulator (60) to transmit data. A thermoelectric cooler (TEC) (58) stabilizes laser temperatures, and a variable optical attenuator (VOA) (54) controls output power. The transmitter (100, 200) is suitable for an optical network unit (ONU) (14) in a passive optical network (PON) (10) communicating with an optical line terminal (OLT) (12).

A spatiotemporal optical multiplexer includes a storage optical cavity having a plurality of storage-cavity modes that are transversely separated, a dump optical cavity having a plurality of dump-cavity modes that are transversely separated, and a phase modulator located in the dump cavity and overlapping all of the dump-cavity modes. Each dump-cavity mode is coupled to a respective storage-cavity mode. The storage-cavity modes have the same storage-cavity resonant frequency while the dump-cavity modes have dump-cavity resonant frequencies that are distinct. The phase modulator is driven to simultaneously tune the dump-cavity resonant frequencies. At any time, no more than one dump-cavity mode is resonant with its respective storage-cavity mode. When this resonance occurs, the energy of the respective storage-cavity mode is coupled out of the storage cavity and through the dump cavity as an output pulse.

A generator device for generating an arbitrary optical pulse pattern includes:a light source to provide primary laser pulses,a distributor to provide a plurality of primary optical pulses by distributing light of the primary laser pulses (LB00k) into a plurality of branches,a combiner to form an output signal by combining modulated optical signals from the branches, anda controller unit to provide control signals for controlling optical modulators of the branches,wherein a first branch comprises a first optical modulator to form a first modulated optical signal from primary optical pulses of the first branch,wherein a second branch comprises a second optical modulator to form a second modulated optical signal from primary optical pulses of the second branch, andwherein a propagation delay of the second branch is different from a propagation delay of the first branch.

An optical communication device, system, and communication method are disclosed. The optical communication device is used to communicate with multiple ONUs, including first-type ONUs and second-type ONUs. The first-type ONUs and second-type ONUs support different MAC protocols, and their uplink wavelengths overlap. The optical communication device includes: a first receiving component, a second receiving component, and a processing component. The first receiving component is used to receive a first optical signal transmitted by a first-type ONU in a first time slot group, and the second receiving component is used to receive a second optical signal transmitted by a second-type ONU in a second time slot group. The first time slot group includes at least one time slot, and the second time slot group includes at least one time slot. The processing component is used to ensure that the first and second time slot groups do not overlap in the time dimension through a first time slot scheduling mechanism. This enables the coexistence of ONUs supporting different MAC protocols and with overlapping uplink wavelengths in a PON system.

Provided is a data synchronization method for a passive optical network. The method comprises: an alignment and restoration step of synchronously aligning a plurality of first data signals, and restoring the aligned plurality of first data signals into a second data signal; performing passive optical network synchronization verification on the second data signal; if the second data signal fails to pass the passive optical network synchronization verification, turning to the alignment and restoration step; and if the second data signal passes the passive optical network synchronization verification, determining that synchronization is successful.

This application discloses a communication method. The method includes: A first apparatus generates and sends a first optical signal, where the first optical signal is a signal obtained by combining a first clock signal with a downlink digital signal, and the first clock signal includes a first transmission delay; and a second clock signal is obtained by transmitting the first clock signal on a transmission link, a sum of a transmission delay of the transmission link and the first transmission delay is zero. A second apparatus performs time synchronization based on the second clock signal. In technical solutions of this application, digital-analog hybrid transmission and simultaneous transmission of the clock signal and the downlink digital signal may be completed through one transmission link, and an independent clock signal transmission link does not need to be established. In addition, after transmission of the first clock signal on the transmission link, the first transmission delay in the first clock signal may be canceled by the transmission delay of the transmission link, and the transmission delay of the transmission link does not need to be measured or calculated, thereby improving accuracy of time synchronization.

A system includes an optical transmitter configured to modulate a pulsed laser signal based on a plurality of data signals to form a plurality of modulated optical data signals, perform optical time division multiplexing of the plurality of modulated optical data signals to obtain a multiplexed optical data signal, and transmitting the multiplexed optical data signal together with an optical clock signal derived from the pulsed laser signal; and an optical receiver comprising a clock recovery branch configured to recover the optical clock signal to a plurality of phase shift recovered optical clock signals and a data branch having a plurality of saturable absorbers (SAs), each SA being in optical communication with one of the phase shift recovered optical clock signals, and configured to receive the multiplexed optical data signal and to transmit one of the plurality of modulated optical data signals according to the recovered optical clock signal.

A time-frequency multiple access system includes a central node and a first leaf node. The method provides a first leaf node sends a first uplink signal to the central node. The first leaf node receives first information and second information from the central node. The first information and the second information are determined based on the first uplink signal. The first information indicates a transmit wavelength of a laser of the first leaf node, and the second information indicates a first uplink sending window. The first leaf node sends, in the first uplink sending window, a second uplink signal to the central node via the laser at a first wavelength. The first wavelength is determined based on the first information, and the first uplink sending window is determined based on the second information.

This application provides a data transmission method and apparatus. The method includes: processing, by a network device, a to-be-sent optical data unit ODD to obtain another ODU, where a bit rate of the another ODU is lower than a bit rate of the ODU; and sending, by the network device, the another ODU. In embodiments of this application, the ODU is processed to obtain the another ODU with a lower bit rate, and this helps reduce a rate increase when service data is transmitted in an OTN, so as to reduce an OTN interface rate and OTN costs.

The present application provides a service data processing method, which includes: generating a service block for each of a plurality of client services based on service data of the client services; mapping the service block for each of the client services to a payload area of ​​at least one subslicing frame SSF; and setting an overhead area field of each of the SSF frames to obtain the at least one SSF frame, where each of the SSF frames carries a service block for each of a plurality of different client services. The present application also provides a service data exchange method, a service data extraction method, a provider edge device, a provider exchange device, and a computer-readable medium.

The invention relates to the technical field of optical transmission, in particular to an optical transmission system and transmission method based on a T-WPON. A novel transmission system is realized through a time division wavelength division multiplexing passive optical network (T-WPON), aiming at a chained networking scene in a power network, the traditional unequal splitting ratio design is replaced, the design of directly packaging Ethernet and serial port services to a VC container, TDM physical isolation and CWDM is adopted, the traditional ONU equipment is replaced, an L2 exchange chip is removed, and the transmission efficiency is improved. According to the method and the device, the condition that services cannot be completely physically isolated due to Ethernet convergence is prevented, the safety is improved through combined isolation of TDM and WDM, an unequal-splitting-ratio link is replaced by adopting a cascade mode of combining an optical module with a combiner / splitter, the limitation of the splitting ratio is avoided, and the receiving stability of a terminal and the user experience are improved; the node position can be flexibly adjusted, and maintenance and capacity expansion are easy.

The invention discloses a device and a method for processing an image and an audio based on MZI network time division multiplexing. The method comprises the following steps: S1, dividing an image signal and an audio signal into an image data block and an audio data block; s2, inputting the image data blocks and the audio data blocks into an MZI network through a time division multiplexing controller; s3, the MZI network adjusts the phase shift, the image data block is processed by the MZI network to output an optical signal after matrix operation, and spectrum analysis is performed on the audio data block; s4, converting the optical signal into an electric signal through a photoelectric conversion module; and S5, performing nonlinear activation function processing on the electric signal, and transmitting the processed signal to a next layer of output module. And S6, outputting the signal subjected to nonlinear activation processing to external equipment, and outputting feature and distribution information, a frequency spectrum and a feature signal. And S7, the time division multiplexing controller iteratively optimizes the photon MZI network. The method is low in delay and high in precision, and image audio efficient processing and feature extraction are achieved.

The present application provides a light splitting device and an optical network system. The light splitting device comprises a wavelength division device, an optical switch, a wave combining device, and at least one output port. The wavelength division device is used for receiving a first signal and demultiplexing the first signal to obtain a first protocol signal and a second protocol signal, and optical communication protocols used by the first protocol signal and the second protocol signal are different. The optical switch is used for receiving a second protocol signal and dividing the second protocol signal into a second signal and a third signal, and the second signal and the third signal are different in the time domain. The wave combining device is used for receiving the first protocol signal and the second signal and performing wavelength multiplexing on the first protocol signal and the second signal to generate a fourth signal. The at least one output port is used for outputting the third signal and the fourth signal. The number of ONUs accessed by an OLT is increased, and the requirement for rapid increase of the number of access users of an optical access network is met on the premise of ensuring that services of different protocols are not interfered.

A first transceiver communicatively coupled to a second transceiver by a first cable and a second cable can transmit a first message to the second transceiver at a first time, T1, via the first cable. The first transceiver can further receive a second message from the second transceiver via the second cable. The second message includes an indication of a second time, T2, and an indication of a third time, T3, associated with when a pulse that is associated with the second message was transmitted by the second transceiver. The first transceiver can further receive the pulse associated with the second message from the second transceiver at a fourth time, T4, via the first cable. The first transceiver can further determine a first delay associated with the first cable based on the T1, the T2, the T3, and the T4.

In one embodiment, an apparatus is configured to perform obtaining a received signal from a plurality of Optical Network Units, ONUs connected to the OLT, wherein the received signal includes at least a desired signal originating from a first ONU; determining a magnitude of the desired signal based on the received signal; adjusting an equalizer based on the magnitude of the desired signal; equalizing the received signal using the equalizer such that an equalized signal corresponding to an estimate of desired signal is obtained; and providing the equalized signal for further processing.

This application discloses a communication method. The method includes: A first apparatus generates and sends a first optical signal, where the first optical signal is a signal obtained by combining a first clock signal with a downlink digital signal, and the first clock signal includes a first transmission delay; and a second clock signal is obtained by transmitting the first clock signal on a transmission link, a sum of a transmission delay of the transmission link and the first transmission delay is zero. A second apparatus performs time synchronization based on the second clock signal. In technical solutions of this application, digital-analog hybrid transmission and simultaneous transmission of the clock signal and the downlink digital signal may be completed through one transmission link, and an independent clock signal transmission link does not need to be established. In addition, after transmission of the first clock signal on the transmission link, the first transmission delay in the first clock signal may be canceled by the transmission delay of the transmission link, and the transmission delay of the transmission link does not need to be measured or calculated, thereby improving accuracy of time synchronization.

One non-limiting and exemplary embodiment provides a terahertz communication system in which terahertz optical signals having respective frequencies are assigned to respective terahertz radio signal transmitters more flexibly when a plurality of frequency bands are stored by multiplexing.SOLUTION: In allocating the terahertz optical signals having the respective frequencies to the respective terahertz radio signal transmission units 2, the terahertz optical signal switching unit 3 switches a combination of allocation of the terahertz optical signals among a plurality of combinations.SELECTED DRAWING: Figure 3

Provided is a service data processing method. The service data processing method includes: generating, based on service data of a plurality of client services, service blocks of the client services, respectively; mapping the service blocks of the client services into a payload area of at least one sub slicing frame (SSF); and configuring an overhead area field of each SSF to obtain the at least one SSF, wherein each of the SSF carries the service blocks of a plurality of different client services. Further provided are a service data exchange method, a service data extraction method, a provider edge device, a provider exchange device, and a computer-readable medium.

Apparatus and method are disclosed that utilize a particular delay modulation technique (i.e., Miller coding) to encode 25 Gb / s data for inclusion with the 50 Gb / s NRZ data in a downstream broadcast transmission from an optical line terminal (OLT) to a plurality of optical network units (ONUs) through an optical distribution network (ODN). The specific Miller coding technique allows for a secondary data stream, operating at half the rate of the NRZ data) to supplement the primary 50 Gb / s NRZ transmission, since both signals are recovered using the same clocking circuitry at the ONU.