56results about "Time-division optical multiplex systems" patented technology

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.

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).

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.

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.

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

System, method, and instrumentalities are described herein for transmitting information optically. The optical source may be configured to generate a beam. The beam may include a series of light pulses. The beam of light may be modulated. A modulator may be configured to modulate the series of light pulses in response to a data transmission signal, thereby encoding transmission data into the series of light pulses. The modulated beam of light may be received and both amplified and filtered. The filtered beam of light may be transmitted from to a detector having a photoreceiver. The photoreceiver may be configured to extract the transmission data from the filtered beam of light.

This application provides a data transmission method, an optical network, a related device, and a storage medium, to effectively avoid a conflict occurring when an optical terminal receives a main downstream data stream and a backup downstream data stream, thereby effectively ensuring that the backup downstream data stream is successful backup of the main downstream data stream. The method includes: An optical head end obtains a main downstream slot and a backup downstream slot between which an intersection set is an empty set on a time axis. The optical head end occupies the main downstream slot, and sends a main downstream data stream to an optical terminal over a main link. The optical head end occupies the backup downstream slot, and sends a backup downstream data stream to the optical terminal over a backup link.

To more accurately identify an abnormally light emitting ONU.SOLUTION: An OLT 110 comprises: an optical transmitting / receiving section 111 which transmits / receives an optical signal to / from a plurality of ONUs 130 in a time division manner; an abnormal light emission detection section 112 for monitoring an optical signal received by the optical transmitting / receiving section 111 and detecting a state where the optical signals are being received as long as or longer than a predetermined period as abnormal light emission in which an optical signal from one or more ONUs 130 included in the plurality of ONUs 130 cannot be received more; and an optical communication control section 114 by which one ONU 130 is selected as a target PNU 130 successively from among the plurality of ONUs 130 excluding the one or more ONUs 130, it is inspected whether or not the abnormal light emission is cancelled by stopping the transmission of the optical signal from the target ONU 130 via the optical transmitting / receiving section 111 and, in a case where the abnormal light emission is cancelled, the target ONU 130 is identified as an abnormally light emitting ONU 130.SELECTED DRAWING: Figure 1

The present invention transmits signals of many optical paths to an upper node by time-division multiplexing optical signals of many lower nodes using a single wavelength. The present invention suppresses a decrease in a transmittable band for each time slot due to an increase in the number of time slots to be statically allocated to each node with an increase in the number of optical paths. A shared time slot (16) which a plurality of lower nodes can use for transmission is prepared. An upper node regularly transmits an optical path header signal (15) including allocation information of the shared time slot and the plurality of lower nodes. Each lower node grasps the shared time slot allocated thereto from the allocation information of the optical path header, and transmits a time-division multiplexed optical signal at the timing when the corresponding shared time slot is in an empty state. The lower node that performs transmission transmits a shared timed slot state signal indicating the state of the corresponding shared time slot in a guard time interval (17). The upper node can designate an ID of a priority node capable of preferentially using the corresponding time slot among the plurality of lower nodes allocated to each shared time slot. The lower nodes other than the priority node wait for transmission until the time slot comes into an empty state.

An apparatus for optical demultiplexing comprising an optical splitter, at least two semiconductor optical elements (SOE's), and an optical gating line arrangement optically coupled to each of the at least two SOE's for altering optical transmission properties of the corresponding SOE.

An electronic-photonic integrated precision delay-control component comprises a coarse-delay switching unit that is configured to assume one of a plurality of selectable switching states and to feed, in a given one of the switching states, an optical input signal forward to at least one of a plurality of selectable optical coarse-delay paths. A controllable fine-delay unit is configured to subject the optical input signal to a selectable fine group-delay amount that is tuneable between zero and a maximum fine group-delay amount. The coarse-delay switching unit and the fine-delay unit are arranged in a series connection to control application of a respective total group-delay amount to the optical input signal on any selectable total delay path, the total group-delay amount corresponding to a sum of the respective coarse group-delay amount and of the selectable fine group-delay amount. Co-integration of electronic components allows a complete pulse train generation on one chip with low sensitivity to perturbation, low drift and low manufacturing costs. A desired delay of individual pulses of the optical input signal can be tuned on chip with particularly high precision at particularly high pulse repetition frequencies.

The invention discloses a pin multiplexing structure of OLT equipment. The pin multiplexing structure comprises a TIA module and an LA module, the TIA module is provided with a burst RSSI monitoring unit, a PD unit, a TIA unit, a comparator unit and a RESET-IN / RSSI-OUT pin. The LA module is provided with a logic switching unit, a current-to-voltage conversion unit, a RESET-OUT / RSSI-IN pin, a system RESET port and a system RSSI (Received Signal Strength Indicator) port; and the RESET-OUT / RSSI-IN base pin is connected with the RESET-IN / RSSI-OUT base pin. Compared with the prior art, the number of the pins can be effectively reduced, and the packaging cost is reduced.

This application discloses a method, a system, and a related device. A controller may determine a first optical channel between an optical transmitting device and an optical receiving device in a first slot based on a data transmission request, and then send configuration information to the optical transmitting device, to indicate the optical transmitting device to send first data to the optical receiving device in the first slot based on a phase compensation coefficient of the first optical channel, so as to compensate for a phase error caused by the first optical channel, thereby improving data recovery accuracy of the optical receiving device, and reducing a bit error rate.

The invention provides a low-redundancy programmable optical delay line network architecture, aiming at solving the problems that the existing programmable optical delay line network architecture is high in redundancy, low in resource utilization rate, insufficient in delay configuration flexibility and limited in maximum delay range. According to the architecture, through scheduling control of the optical switches, limited optical delay line resources are dynamically shared among multiple channels according to needs, the delay line redundancy is remarkably reduced, the resource utilization rate is improved, the delay configuration types are expanded, the maximum delay difference delta Dmax between the channels is improved to be more than two times that of a traditional architecture, and meanwhile the hardware cost is reduced. Besides, the architecture adopts a modular design, and can be expanded to a large-scale multi-channel network in combination with a cascade sharing delay module and a wavelength division multiplexing technology, and the consumption of hardware resources is further reduced. The multi-channel adjustable delay circuit is remarkable in technical effect and can be widely applied to the fields of optical beam forming, optical calculation, programmable microwave photon processors, optical quantum circuits and the like needing multi-channel adjustable delay.

Provided is an optical communication device for carrying out optical communication, which is wireless communication using light. The optical communication device comprises: an optical communication unit that includes a plurality of light-receiving elements and a plurality of light-emitting elements and handles the optical communication in a plurality of colors; and a control unit that controls the optical communication unit to receive an optical signal from another optical communication device and transmit an optical signal to the other optical communication device with the same color or a pair of colors having sequential wavelengths which is selected from the plurality of colors.

Optical and electrical modules with enhanced features and associated apparatus and methods. The optical modules are configured to implement one or more features that are offloaded from Ethernet devices to which the optical modules are configured to be attached. The features include support for timestamping packets and preamble using IEEE 1588 Precision Time Protocol (PTP) profiles, support for implementing IEEE 1588 one-step operations, support for implementing IEEE 1588 Ethernet Synchronous Clocks (SyncE) profiles, support for In-Band Network Telemetry (INT), and support for implementing a MACsec security protocol defined by IEEE standard 802.1AD. The enhanced features provided by the optical modules enable Ethernet devices to be upgraded to support the enhanced features by replacing conventional optical modules with the optical modules disclosed herein. Support for White Rabbit IEEE PTP and SyncE profiles is also provided.

The generator for generating the optical pulse pattern is the primary laser pulse (LB00 k ), and the light of the primary laser pulse is split into multiple branches (A1, A2) to generate multiple primary optical pulses (LB0 k,1 , LB0 k,2 ) and the modulated optical signal (LB1 k,1 , LB1 k,2 ) are combined to output signal (LB2 k ), and a control unit that outputs a control signal for controlling the optical modulators (MOD1, MOD2) of the branches according to a primary pattern, and the first branch (A1) outputs a first branch primary optical pulse (LB0 k,1 ) to the first modulated optical signal (LB1 k,1 ), and the second branch (A2) has a first optical modulator (MOD1) for forming the first order optical pulse (LB0 k,2 ) to a second modulated optical signal (LB1 k,2 ), the propagation delay of the second branch being different from the propagation delay of the first branch.

Provided is a data synchronization method for a passive optical network. The method includes performing an aligning and recovering operation including: performing synchronization alignment on multiple paths of first data signals, and recovering aligned multiple paths of first data signals into a path of a second data signal; performing passive optical network synchronization verification on the second data signal; and in a case where the second data signal does not pass the passive optical network synchronization verification, returning to the aligning and recovering operation; or in a case where the second data signal passes the passive optical network synchronization verification, determining that the synchronization alignment is successful.

Aspects of the subject disclosure may include, for example, generating a first set of optical signals, demultiplexing the first set of optical signals to generate demultiplexed signals, launching the demultiplexed signals into a medium, receiving from the medium a second set of optical signals, multiplexing at least a portion of the second set of optical signals to generate one or more multiplexed signals, obtaining one or more electrical signals according to one or more measurements of one or more optical fields of the one or more multiplexed signals, and generating one or more point spread functions from the one or more electrical signals. Other embodiments are disclosed.

The application discloses a pin multiplexing structure of an OLT device, which comprises a TIA module and a LA module; the TIA module has a burst RSSI monitoring unit, a PD unit, a TIA unit, a comparator unit and a RESET-IN / RSSI-OUT pin; the LA module has a logic switching unit, a current-to-voltage unit, a RESET-OUT / RSSI-IN pin, a system RESET port and a system RSSI port; and the RESET-OUT / RSSI-IN pin is connected with the RESET-IN / RSSI-OUT pin. Compared with the prior art, the application can effectively reduce the number of pins and reduce the packaging cost.

Systems and methods for Flexible Optical Transport Network (FlexO) remote deskew procedure include, at a terminating receiver, detecting relative skew between multiple interfaces in a group in a FlexO network, and signal information based on the detected skew to one or more remote transceivers located in a backwards direction relative to the receiver. At a remote transceiver, the systems and methods include based on detected skew between multiple interfaces in a group in at a terminating receiver, receiving skew information therefrom, and causing alignment of the multiple interfaces based on the received skew information.