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Time division

Subclass of:

398 - Optical communications

398043000 - MULTIPLEX

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Class / Patent application numberDescriptionNumber of patent applications / Date published
398099000 Multiple access (e.g., TDMA, CSMA) 8
398102000 Including delay 7
398103000 Through free space 5
20090310971VISIBLE LIGHT COMMUNICATION METHOD AND SYSTEM - A time-sharing Visible Light Communication (VLC) system is provided. Two or more light sources transmit data received from one or more VLC terminals located in its service area to a communication control device, and transmits data received from the communication control device to the one or more VLC terminals. The communication control device determines and groups at least one of the two or more light sources to be included in a cell according to a generated user service, maps the grouped at least one light source to the cell, allocates a time slot used to provide the user service to the cell, transmits data associated with the user service to at least one of the one or more VLC terminals through the at least one light source mapped to the cell using the allocated time slot, detects a location of the at least one VLC terminal located in a service area of the cell on a real-time basis, and remaps the cell according to the detected location.12-17-2009
20130216233VISIBLE LIGHT COMMUNICATION METHOD AND APPARATUS - A visible light communication method and terminal are provided for communicating with a visible light coordinator which discriminates between at least one communication area cell that includes at least one light source and a boundary area positioned between the communication area cell and another communication area cell adjacent to the communication cell area, and which provides time division visible light communication. Data of the visible light communication terminal is received from the visible light coordinator using a first time slot in a first communication area cell determined according to a position of the visible light communication terminal. The visible light coordinator is communicated with using a second time slot assigned from the visible light coordinator, when the visible light communication terminal is located in a boundary area of the first communication area cell. The second time slot has not been assigned to the visible light communication terminal.08-22-2013
20110069960Systems and methods for visible light communication - Systems and methods for visible light communication are disclosed. In part, illumination devices and related systems and methods are disclosed that can be used for general illumination, lighting control systems, or other applications. The illumination devices synchronize preferentially to the AC mains to produce time division multiplexed channels in which control information can be communicated optically by the same light source that is producing illumination. Such illumination devices preferentially comprise LEDs for producing illumination, transmitting data, detecting ambient light, and receiving data, however, other light sources and detectors can be used. The physical layer can be used with a variety of protocols, such as ZigBee, from the Media ACcess (MAC) layer and higher.03-24-2011
20110091215MICROWAVE TRANSMISSION APPARATUS, SIGNAL PROCESSING METHOD AND DEVICE IN MICROWAVE TRANSMISSION APPARATUS - In the field of signal processing technologies, a microwave transmission apparatus, a signal processing method and device in a microwave transmission apparatus are provided, which are capable of improving the signal-to-noise ratio of the service signal and the reliability of the communication signal, and increasing the distance between an indoor unit (IDU) and an outdoor unit (ODU). In the technical solutions, a signal processing method in a microwave transmission apparatus includes: directly multiplexing at least a service signal and a non-service signal, and converting the multiplexed electric signal into a multiplexed optical signal; and sending the multiplexed optical signal to an ODU.04-21-2011
20080199183Interface Method Between Remote Radio Unit And Centralized Transceiver Station - The present invention discloses a method for transmitting signal between a central channel processing Main Unit (MU) and one or more Remote Radio Units (RRUs) by using SDH/OTN in Centralized Base Transceiver Station system using remote radio head (RRH) technology. The method includes: dividing the communication interface between the MU and the RRUs into a user plane and a control plane, the user plane mainly for carrying I/Q sampling data concerning the user data, and the control plane mainly for carrying the data concerning control signaling; forming the I/Q sampling data concerning the user data carried by the user plane into an I/Q data frame via an I/Q data frame adaptation layer, then forming the I/Q data frame into a GFP frame via GFP and transmitting it on SDH/OTN; and carrying the control signaling of the control plane on UDP/IP and/or TCP/IP, and further carrying IP packet on PPP and forming it into a frame by HDLC, transmitting the HDLC frame including the control plane signaling on the SDH/OTN via the control character channel of the GFP frame. According to the present invention, the existing SDH/OTN transmission network is utilized directly, which further reduces the management and maintenance operation needed for signal transmission, as well as networking cost.08-21-2008
398101000 By specific optical element 4
20090232505Multi-Channel Optical Communication - An optical fiber communications apparatus comprises a housing provided with a motherboard and with a support defining plurality of card receptors. A plurality of modular cards (09-17-2009
20100021175Optical-time-division-multiplexing differential phase shift keying signal generating apparatus - An apparatus detecting an optical carrier phase difference between adjacent optical pulses structuring an OTDM-DPSK signal, by generally-used optical and electrical elements, is provided. An OTDM-DPSK signal generating section has an optical splitter, a first phase modulator, a second phase modulator, an optical coupler, and a monitor signal branching device, and generates and outputs an OTDM-DPSK signal and a monitor signal. An optical carrier phase difference detecting section has an optical carrier interferometer, and an interference signal detecting section including a optical-to-electrical converter and a peak detection circuit. The monitor signal is inputted to the optical carrier interferometer, and an interference monitor signal is outputted. The interference monitor signal is inputted to the optical-to-electrical converter, and an electrical interference monitor signal is outputted. The electrical interference monitor signal is inputted to the peak detection circuit, and an optical carrier phase difference detection signal is generated and outputted.01-28-2010
20100021174METHODS AND SYSTEMS FOR PROVIDING FULL AVIONICS DATA SERVICES OVER A SINGLE FIBER - A method for transmission of multiple, independent data packages across a single optical fiber utilizing both time division multiplexing and wavelength division multiplexing is described. The method includes transmitting a first data package across the single optical fiber at a first wavelength and transmitting a second data package across the same optical fiber at a second wavelength, in either the same direction or in a direction opposite as the first data package, wherein the second data package transmission may be concurrent with the first data package transmission. the method further includes separating the data package transmissions into two optical paths, filtering the second wavelength from a first of the two optical paths, detecting the first data package at the first wavelength, filtering the first wavelength from a second of the two optical paths, and detecting the second data package data at the second wavelength.01-28-2010
20120063784OPTICAL SIGNAL DEMULTIPLEXING DEVICE AND OPTICAL SIGNAL DEMULTIPLEXING METHOD - An optical signal demultiplexing device includes a demultiplexing unit that receives an optical signal multiplexed by an optical time-division system and a synchronization pattern, and demultiplexes the optical signal based on the synchronization pattern. The optical signal demultiplexing device also includes a pulse-width increasing unit that makes optical signals demultiplexed by the demultiplexing unit generate chirp, and increases the pulse widths of the optical signals generating the chirp by passing the optical signals through a wavelength dispersion medium.03-15-2012
398100000 Subscriber system 3
20120263475METHOD AND APPARATUS FOR GENERIC MAPPING PROCEDURE GMP AND METHOD AND APPARATUS FOR GENERIC MAPPING PROCEDURE GMP DEMAPPING - Embodiments of the present invention disclose a method for the generic mapping procedure GMP mapping, a method for GMP demapping, and an apparatus. The method for mapping includes: carrying, in an overhead GMP OH of the ith GMP block container, information about a TS that needs to be occupied by the (i+n)th GMP block container; adjusting the (i+n)th GMP block container according to the information about the TS that needs to be occupied by the (i+n)th GMP block container; performing, according to the adjusted (i+n)th GMP block container, the GMP mapping on customer service data to be sent, so that a receive end is capable of adopting a corresponding demapping manner according to a change of the block container, which implements lossless mapping and demapping processing by adopting a GMP for a variable block container.10-18-2012
20130148972PASSIVE OPTICAL NETWORK SYSTEM, OPTICAL LINE TERMINAL, AND OPTICAL NETWORK UNIT - An optical line terminal includes the transmission rate control table for storing a minimum bandwidth for an emergency status for each of optical network units in addition to a maximum assigned bandwidth in a normal status. When a decrease in a supply power is detected, the optical line terminal calculates a transmission clock rate providing a minimum bandwidth required by each optical network unit with reference to the transmission rate control table. The optical line terminal determines change timing of downstream and upstream transmission clock rates, and change timing of upstream data for time-division multiplexing to instruct each of the optical network units. Both the optical line terminal and the optical network unit change the transmission clock rates with substantial synchronization therebetween.06-13-2013
20120027414Transparent Clocks in Access Networks - An apparatus comprising a device at an access node (AN) comprising an interface, a Precision Time Protocol (PTP) engine, and a timestamp module, and a second device at a customer premise node coupled to the AN and comprising a second interface, a second PTP engine, and a second timestamp module, wherein the device at the AN is configured to send a PTP event message to the device at the customer premise node to implement a transparent clock (TC) scheme, wherein the PTP engine is configured to trigger the timestamp module to send a timestamp to the customer premise node when the PTP event message transverses the interface, and wherein the second PTP engine is configured to trigger the second timestamp module to create a second timestamp when the PTP event message transverses the second interface.02-02-2012
Entries
DocumentTitleDate
20100046951METHOD, APPARATUS AND SYSTEM FOR TRANSPORTING MULTI-LANE ETHERNET SIGNAL - Methods, apparatuses and systems for transporting multi-lane Ethernet signal are disclosed. The method primarily includes utilizing a plurality of timeslot channels and justification bytes configured in the OPUk-Xv to build up multiple virtually concatenated transport lanes; and transporting a lane of independent Ethernet data via each lane in the multiple transport lanes. Such schema allows to transparently transport multi-lane Ethernet signal over OTN and addresses the uncontrollability of the time delay occurred when multi-lane Ethernet signal traverse over OTN. In addition, the problem that the frequency offset does not fit the IEEE definition of the Ethernet interface is solved.02-25-2010
20090154932Pluggable Module with Integrated Time Division Multiplexing - A network comprising at least one host device having an interface card connected to a backplane of said host device, wherein said interface card comprises at least one cage for receiving a pluggable module wherein the pluggable module comprises Time Division Multiplexing (TDM) between an optical network interface and an electrical host interface.06-18-2009
20100067913PASSIVE OPTICAL NETWORK SYSTEM AND OPTICAL LINE TERMINATOR - In a passive optical network system in which signals from a master station to plural slave stations are time-division multiplexed and transmitted, the slave stations different in transmission speed are mixedly contained. The master station (OLU) performs ranging for each transmission speed, and grasps all the slave stations different in transmission speed for each transmission speed, and generates a frame including signals of a suitable transmission speed corresponding to each slave station. When the frame is generated, in a downstream signal in which signals of plural transmission speeds are mixed, a dummy signal is set at a place where the transmission speed is changed, and a time necessary to follow a change in level of a received signal due to a change in optical level caused when the transmission speed is changed is secured. Thereby, each ONU avoids a reception error occurring in the time necessary to follow.03-18-2010
20130136452Time-Domain Based Composite Modulation for Spectrally Efficient Optical Networks - Methods, systems, and apparatuses for time-based composite modulation of an optical carrier signal are provided. Time-based composite modulation includes determining a plurality of fixed time slots for the optical carrier signal, wherein the plurality of fixed time slots comprise a time-division-multiplexing frame. Determining a modulation format for each fixed time slot of the time-division-multiplexing frame, wherein a transport spectral efficiency of the modulation format determined for a first fixed time slot is different from a transport spectral efficiency of the modulation format determined for a second fixed time slot, and determining a number of binary bits for each fixed time slot of the time-division-multiplexing frame, wherein the number of binary bits for a fixed time slot is based on the modulation format determined for the fixed time slot.05-30-2013
20090269072METHODS FOR ALLOCATING TRANSMISSION BANDWIDTHS OF A NETWORK - Methods for allocating transmission bandwidths of a network are adapted to a network including an office terminal and peripheral terminals. The peripheral terminals communicate with the office terminal by time division multiplexing during a sequence of transmitting cycles. The method includes receiving requested bandwidths from uploading messages delivered from the peripheral terminals, arranging an uploading order of the peripheral terminals based on the uploading messages to obtain a transmitting sequence, adjusting the uploading order of each of the peripheral terminals in the transmitting sequence based on a size of the requested bandwidth to obtain a modified transmitting sequence, and arranging a modified uploading order of the peripheral terminals based on the modified transmitting sequence. Therefore, the transmission bandwidth allocation is fairer, and delay is reduced. Upstream order of each terminal is transferred based on its requested bandwidth, thereby effectively reducing the average delay.10-29-2009
20090269071Operation terminal - An operation terminal includes a communication unit; an operation terminal control unit; a plurality of on-period light-emitting units provided in a one-to-one correspondence to the control switches and controlled by the operation terminal control unit; a plurality of off-period light-emitting units provided in a one-to-one correspondence to the control switches and controlled by the operation terminal control unit to emit light when the load associated with the corresponding one of the control switches by relational data is in an off-state; and a housing. At least one half of the control switches are arranged one above another in a vertical direction and each of the on-period light-emitting units is arranged in such a fashion as to transversely interpose the corresponding one of the control switches between itself and the corresponding one of the off-period light-emitting units when seen from the front side.10-29-2009
20090269070Multiplexer with Aptical Add/Drop - A method of extracting a predetermined channel from an OTDM signal includes the steps of combining at the inlet of an SOA the OTDM signal and an impulsive signal with impulses temporally synchronized with the channel to be extracted to produce in the SOA FWM, XGM and XPM effects which shift to a length c the channel chosen for extraction with c outside the length d of the OTDM signal with the other channels outlet from the SOA and filtering the SOA outlet to extract components with c d that represent respectively the desired channel and the cleaned OTDM signal. A multiplexer in accordance with the method includes an inlet (10-29-2009
20090232504OPTICAL LINE TERMINATION, OPTICAL NETWORK UNIT, OPTICAL COMMUNICATION SYSTEM, TIMING CONTROL METHOD, AND RECORDING MEDIUM STORING PROGRAM FOR APPARATUS - A plurality of lines which differ in transmission rate can coexist using a time division multiplexing (TDM) technique without any signal collision. An optical line termination (OLT) is connected to a plurality of lines which differ in transmission rate, and includes a timing extraction unit which extracts data transmission timing from a predetermined one of the plurality of lines and a timing allocation unit which allocates data transmission timing for a different line not to collide with the data transmission timing extracted by the timing extraction unit. An optical network unit (ONU) corresponding to the different line transmits data based on the allocated data transmission timing.09-17-2009
20080219669SDH/SONET Convergent Network - An apparatus comprising at least one component configured to implement a method comprising inserting best effort packet (BEP) data into a synchronous digital hierarchy (SDH)/synchronous optical network (SONET) frame without encapsulating or reframing the BEP data. Also disclosed is an apparatus comprising a SDH/SONET framer, and a multiplexer coupled to the SDH/SONET framer, wherein the multiplexer is configured to receive native-form BEP data. Included is an apparatus comprising at least one component configured to implement a method comprising receiving time division multiplexed (TDM) data, receiving BEP data, switching the TDM data using a TDM switch fabric, switching the BEP data using a packet switch fabric, and transmitting at least some of the TDM data and the BEP data over a single interface without encapsulating the BEP data.09-11-2008
20110280581SYSTEMS AND METHODS FOR PRODUCING HIGH-POWER LASER BEAMS - A method of operating a high-output-power fiber laser system includes: time multiplexing a plurality of pulses, each pulse having a pulse width, and each having a different wavelength from a plurality of seed oscillators onto a single fiber; setting each pulse width to a width less than the phonon lifetime; separating in time each pulse from each other pulse so as to leave a gap between adjacent pulses; setting a time between pulses each having a common wavelength to a time longer than a round-trip time of flight through a fiber amplifier of pulses having the common wavelength; and injecting the plurality of pulses from the single fiber into the fiber amplifier. Also to disclosed is a system capable of performing the method.11-17-2011
20110299853PRECISION TIME TRANSFER OVER OPTICAL FIBER - A clock at a first network element that is connected to a second network element over an optical fiber link is aligned using bursts of timing information exchanged between the two network elements. According to one method, the bursts from the first network element to the second network element and the bursts from the second network element to the first network element are transmitted over the same wavelength channel of the optical fiber link, in which case zero asymmetry in the transit delays can be assumed during the alignment procedure. According to another method, the bursts from the first network element to the second network element and the bursts from the second network element to the first network element are transmitted over different wavelength channels of the optical fiber link, in which case the asymmetry in the transit delays can be quantified and applied during the alignment procedure.12-08-2011
20090129781OPTICAL COMMUNICATION APPARATUS, OPTICAL COMMUNICATION METHOD, AND OPTICAL COMMUNICATION SYSTEM - Optical communication apparatuses capable of performing appropriate communication according to a distance to a receiving apparatus, optical communication methods, and an optical communication system are provided. A transmitting apparatus transmits an optical signal corresponding to data. The transmitting apparatus modulates intensity of the optical signal into intensity corresponding to a distance over which the data is to be delivered and outputs this intensity-modulated optical signal. This allows the transmitting apparatus to change the intensity of the optical signal corresponding to the data according to a distance to a receiving apparatus that receives the data, which thus allows the receiving apparatus to surely receive the data.05-21-2009
20100034539APPARATUS FOR SYNCHRONIZING CLOCK IN REAL-TIME LOCATING SYSTEM AND METHOD THEREFOR - A highly precise clock synchronization apparatus in a real-time locating system (RTLS), includes an optical transmitting/receiving unit for receiving a clock information frame from a clock synchronization server, converting the received clock information frame in series-parallel, and transmitting/receiving the clock information data and the clock information; an offset estimation unit for detecting a preamble signal and a clock information signal from the series-parallel converted clock information frame, calculating a phase difference value by comparing the detected preamble signal with the detected clock information signal, and outputting an offset value based on the calculated phase difference value; and a clock synchronization unit for updating a local clock value to a time of the clock synchronization server based on the offset value and the clock information frame.02-11-2010
20100080562DEGRADATION ADAPTATION NETWORK - Consistent with the present disclosure, based on system requirements or in response to an increase in optical signal-to-noise level of an optical channel, such as a WDM channel, additional FEC bits are inserted into and replace selected data payload bits in each frame carried by the channel. The replaced data payload bits may then be transmitted in subsequent frames on the same channel. As a result, the transmitted frames have a reduced data payload rate, but a higher coding gain. Alternatively, the replaced data payload bits may be included in frames transmitted on another optical channel. In that case, the frames carried by the two channels typically have the same bit length or number of bits and may thus be compliant with the frame length requirements of G.709, for example. Preferably, the number of coding bits may be changed dynamically to obtain different coding gains.04-01-2010
20090142062Dynamic frequency adjustment for interoperability of differential clock recovery methods - A system and method for dynamic frequency adjustment for interoperability of differential clock recovery, including one or more of the following: a frequency generator for receiving a frequency reference clock signal and generating a plurality of frequency signals by operating on the frequency reference clock signal, the plurality of frequencies signals being output from the frequency generator and each having a different frequency; a flexible distributor for receiving the plurality of frequency signals from the frequency generator and selecting ones of said plurality of frequency signals and transmitting said selected ones of said plurality of frequency signals; and a plurality of differential units, each for receiving one of said selected ones of said plurality of frequency signals, each for applying a differential signal to said selected ones of said plurality of frequency signals, and each for adding time stamps to the selected ones of said plurality of frequency signals and outputting respective time stamped differential selected frequency signals.06-04-2009
20110200335DATA CHANNEL ORGANIZATION FOR A SWITCHED ARBITRATED ON-CHIP OPTICAL NETWORK - A system for optical data communication, including: a first sending node including a first data item for transmission to a first receiving node during a first timeslot; a second sending node including a second data item for transmission during a second timeslot; a first optical data link (ODL) and a second ODL; a first output switch configured to switch the first data item from the first sending node onto the first ODL during the first timeslot; a second output switch configured to switch the second data item from the second sending node onto the first ODL during the second timeslot; an optical coupler connecting the first and second ODL; and a first input switch operatively connecting the first receiving node with the second ODL and configured to switch the first data item from the second ODL to the first receiving node during the first timeslot.08-18-2011
20090279895Frequency doubler, signal generator, optical transmitter, and optical communication apparatus - An input unit receives input of a clock signal having a voltage that varies continuously. A supply unit supplies a constant reference voltage. A selector outputs a clock signal having voltage that is changed alternately each time the voltage of the clock signal input from the input unit shifts across the reference voltage supplied from the supply unit. A calculating circuit outputs the exclusive-OR of the clock signal input from the input unit and a clock signal output from the selector.11-12-2009
20090110403METHOD AND APPARATUS FOR REDUCING DATA BURST OVERHEAD IN AN ETHERNET PASSIVE OPTICAL NETWORK - One embodiment of the present invention provides a system that reduces data burst overhead in an Ethernet passive optical network which includes a central node and at least one remote node, wherein downstream data from the central node is broadcast to the remote nodes, and wherein upstream data from a remote node is transmitted to the central node in a unicast manner. During operation, the central node transmits grant messages to a number of remote nodes, wherein a grant message for a specified remote node assigns a start time and a duration of a transmission timeslot in which the specified remote node may transmit an upstream data burst. In response to the grant messages, the central node then receives a number of upstream data bursts, wherein the time gap between two consecutive upstream data bursts is less than the summation of a default laser turn-on time, a default laser turn-off time, an AGC period, and a CDR period.04-30-2009
20080232809Virtual Burst-Switching Networks - A time-shared network comprising edge nodes and optical core nodes may be dynamically divided into several embedded networks, each of which covering selected edge nodes. At least one of the edge nodes may host an embedded-network controller operable to form multiple-source flow-rate allocation requests each of the requests specifying flow-rate allocations to a plurality of paths from several source nodes to several sink nodes. A core node may also host an embedded-network controller or several embedded-network controllers. The time-shared network may use both time-division multiplexing and burst switching.09-25-2008
20090097853SHARING VALUE OF NETWORK VARIABLES WITH SUCCESSIVELY ACTIVE INTERFACES OF A COMMUNICATION NODE - A method includes storing a value of shared variables from a first active packet-to-tdm interface. The value of the shared variables is provided to a successor active packet-to-tdm interface.04-16-2009
20080285975Burst scheduling methods in Optical Burst Switching system - Provided is a burst scheduling method in an Optical Burst Switching (OBS) system in which a plurality of nodes are connected through a mesh-type network. When a TDB which has used many network resources via a plurality of nodes and an SHG burst generated in a previous node, among bursts including BCPs transmitted from the previous node, compete in a current node so as to occupy a specific output channel, scheduling is performed to cause the TDB to have a higher priority than the SHG burst such that the corresponding output channel is occupied. Therefore, it is possible to minimize a burst loss in a network node, thereby enhancing the overall system performance.11-20-2008
20080285976Optical signal demultiplexing device and optical signal demultiplexing method - An optical signal demultiplexing device includes a demultiplexing unit that receives an optical signal multiplexed by an optical time-division system and a synchronization pattern, and demultiplexes the optical signal based on the synchronization pattern. The optical signal demultiplexing device also includes a pulse-width increasing unit that makes optical signals demultiplexed by the demultiplexing unit generate chirp, and increases the pulse widths of the optical signals generating the chirp by passing the optical signals through a wavelength dispersion medium.11-20-2008
20090080895TIME MULTIPLEXED SPACE SWITCH - The present invention provides an optical time multiplexed space switch including a pulsed laser source, and means for producing from the laser source a plurality of wavelengths of pulsed radiation including means for providing permutable multi-wavelength pulse sequences from said multi-wavelength source and means for translating the input data pulses into the multi-wavelength pulse sequence. Each data pulse is subsequently guided through a wavelength selective structure, which may contain delay lines. In the case of time-slot interchange, the pulses are recombined in an interchanged sequence. In the case of tributary space switching different wavelength pulses are switched to generally different outputs and combine with pulses originating from different inputs. Alternatively, instead of or in addition to the means for providing permutable multi-wavelength pulse sequences from the pulsed source, means are provided for the permutation of the multi-wavelength data pulse sequence in reconfigurable wavelength selective structures.03-26-2009
20090097854OPTICAL SIGNAL PROCESSING APPARATUS - An O/E conversion element converts an input NRZ optical signal into an electric signal. A clock recovery circuit recovers a clock signal from the electric signal obtained by the O/E conversion element. A phase modulator applies phase modulation to the NRZ optical signal, using the recovered clock signal. An intensity modulator applies intensity modulation to the NRZ optical signal, using the recovered clock signal. A dispersion medium compensates for a frequency chirp of an optical signal output from the intensity modulator.04-16-2009
20090148167Communication apparatus and signal transmitting method - A communication apparatus time-division multiplexes a first signal transmitted at a first bit rate and a second signal transmitted at a second bit rate which is an integer multiple of the first bit rate, and sends out the first signal and the second signal to one line. The communication apparatus includes a pulse generating unit and a pulse superimposing unit. The pulse generating unit generates repetitive pulses having a width equal to a width of the first signal. The pulse superimposing unit superimposes the pulses generated by the pulse generating unit on the second signal.06-11-2009
20090214217Optical Device and a Method for Converting WDM Signals Into an OTDM Signal and Vice Versa - The invention relates to a device and a method for converting WDM signals into an OTDM signal. The device comprises shifting means (08-27-2009
20090245802SYSTEM AND METHOD FOR DUAL WAVELENGTH COMMUNICATIONS OF A CLOCK SIGNAL - A system and method for synchronizing a clock signal. Data traffic is received through a first channel of a fiber optic. A clock signal is received through a second channel of the fiber optic. A clock at a node is disciplined with the clock signal. The clock signal is sent from the clock to one or more interfaces within a node.10-01-2009
20090263135METHOD AND APPARATUS FOR TRANSPORTING CLIENT SIGNAL IN OPTICAL TRANSPORT NETWORK - A method for transporting a client signal in an optical transport network (OTN) includes steps as follows. A byte number Cn of a client signal transported in a current OTN frame period is generated according to a client signal clock and a system clock. If the Cn of the current OTN frame falls in a certain range, a predetermined area in an optical channel payload unit-k (OPUk) overhead field is identified as normal, and the Cn is filled in the OPUk overhead field of the current OTN frame. Therefore, the reliability for transporting the client byte number can be improved and an OPUk overhead byte space needed for transporting the client signal byte number can be saved.10-22-2009
20090252498OPTICAL ROUTING AND TRANSPORT ACCELERATION (ORTA) - Conversions between digital, parallel-electronic and digital, serial-optic words are presented, specifically for interconnection networks with optical communication links.10-08-2009
20100021173METHOD AND APPARATUS FOR MULTIPLEXING AND DEMULTIPLEXING LOW BIT RATE SERVICES - A method for multiplexing and demultiplexing low bit rate services includes dividing an OTN frame into a plurality of time slots and allocating the plurality of time slots to the low rate services according to the bit rate of the low rate services; asynchronously mapping a synchronous service to the time slots allocated to the synchronous service if it is determined that the low bit rate service is a synchronous service; encapsulating the low bit rate service and mapping the low bit rate service to the time slots allocated to the low bit rate service if it is determined that the low bit rate service is not a synchronous service. The present invention allows the OTN to realize the bearer of the low bit rate data service and achieves the multiplexing and demultiplexing of hybrid services.01-28-2010
20100239264OPTICAL TRANSMISSION SYSTEM, APPARATUS AND METHOD - An optical transmission system, an optical transmitting apparatus, an optical transmitting method, an optical receiving apparatus, and an optical receiving method are provided. The optical transmitting apparatus includes a pre-coding module, a multiplexing module, and a modulating module. The optical receiving apparatus includes a demodulating module and a converting module. The optical transmitting method includes: performing pre-coding, multiplexing, and modulation for a signal to be transmitted, and then outputting the signal. The optical receiving method includes the following steps: receiving an optical signal of a transmitted signal; demodulating the optical signal according to a preset time delay, where the preset time delay equals to a product of a number of branches multiplexed by a transmitting apparatus and an element period of a signal multiplexed by the transmitting apparatus; converting the demodulated optical signal into an electrical signal; and obtaining information of the transmitted signal according to the electrical signal.09-23-2010
20100254709System and Method for Performing Concatenation of Diversely Routed Channels - A system and method are provided for performing Local Centre Authorization Service (LCAS) in a network system, the system having a data aligner configured to align bytes of input data according to groups of members. The system also including an LCAS control manager configured to generate de-sequencing control commands in response to data input from the data aligner. The system further including a de-sequencer configured to de-sequence the input data input from the data aligner according to de-sequencing control commands received from the LCAS control manager.10-07-2010
20090169213METHODS AND APPARATUS FOR OPTICAL TRANSMISSION OF DIGITAL SIGNALS07-02-2009
20100209111POINTER OFFSET MECHANISM ENABLING COST EFFECTIVE SONET/SDH MAPPING/DEMAPPING OVER ETHERNET - In one embodiment, a SONET/SDH over Ethernet demapping point utilizes a pointer offset mechanism for clock recovery and timing. The pointer offset is determined by the difference between a client clock and a reference clock.08-19-2010
20100296813OPTICAL SIGNAL PROCESSING METHOD AND DEVICE AND ASSOCIATED CENTRAL EQUIPMENT AND ACCESS NETWORK - A method and apparatus are provided for processing a composite optical signal formed of a sequence of time sectors obtained by time-division multiplexing a plurality of optical signals transmitted on a plurality of transmission channels of a shared optical access network. The method includes: taking account of a schedule for transmission of the plurality of optical signals in the access network, the schedule associating with a time sector an optical signal of the sequence and a transmission channel of the plurality of transmission channels used by the optical signal; recovering a set of representative performance parameters of the transmission channel associated with the time sector; and adaptively correcting the time sector using the set of parameters.11-25-2010
20100303464METHOD, SYSTEM, AND DEVICE FOR TRANSMITTING DATA IN OPTICAL TRANSPORT NETWORK - A method, a system, and a device for transmitting data in an OTN are disclosed herein. The method for transmitting data in an OTN includes: mapping the at least one pair of ODU12-02-2010
20100226652Method and apparatus for mapping and de-mapping in an optical transport network - The embodiments of the present invention disclose method and apparatus for mapping and de-mapping in an optical transport network, where the mapping method includes: constructing an Optical Channel Data Tributary Unit (ODTU) according to an amount M of time slots of a High Order Optical Channel Payload Unit (HO OPU) to be occupied by a Low Order Optical Channel Data Unit (LO ODU); mapping the LO ODU to a payload area of the ODTU in a M-byte granularity; encapsulating overhead information to the payload area of the ODTU; and multiplexing the ODTU, which has been mapped the LO ODU and encapsulated with the overhead information, to the HO OPU, so as to provide a high-efficient and universal mode for mapping the LO ODU to the HO OPU.09-09-2010
20100322634BANDWIDTH ALLOCATION METHOD AND PASSIVE OPTICAL NETWORK SYSTEM - An optical line terminal calculates a requirement threshold for each optical subscriber unit based on a difference between the time average allocated bandwidth of each optical subscriber unit and the target bandwidth, and notifies a corresponding optical subscriber unit of the calculated requirement threshold. The corresponding optical subscriber unit then notifies, based on the data amount accumulated in a buffer, the optical line terminal of a data amount, as a transmission requirement, up to a data separation that is less or equal to the notified requirement threshold and in which a maximum transmission amount can be transmitted. The optical line terminal then notifies the corresponding optical subscriber unit of a transmission permission amount in which the data equal to the transmission requirement of which the optical line terminal is notified can be transmitted. The corresponding optical subscriber unit then transmits the data amount corresponding to the transmission permission amount.12-23-2010
20110116803TERMINAL APPARATUS, DATA TRANSMISSION SYSTEM AND DATA TRANSMISSION METHOD - There is provided a terminal apparatus including a message monitor to gather transmission request information from each of first and second terminating apparatus, a dynamic bandwidth allocation unit to allocate each transmission band in accordance with the gathered transmission request information, determine a size and an alignment position of a time slot in accordance with the allocated transmission band, determine a transmission start time of the time slot, and allocate an extinction period so as to stop a transmission of an optical signal between a time slot of the optical signal with the second transmission rate and a time slot following the time slot of the optical signal with the second transmission rate, and a MAC controller to generate a control frame for notifying each of the first and second terminating apparatus of the transmission start time and the size of the time slot.05-19-2011
20110249974METHOD AND APPARATUS FOR REGULATING SERVICE OF OPTICAL SYNCHRONOUS DIGITAL HIERARCHY NETWORK - The present invention discloses a method and an apparatus for adjusting a service of optical synchronous digital hierarchy network, and the method comprises: at first configuring the input time-slot space-division cross path to the time-division module after adjustment in space-division module and the time-division cross path of the time-division module after adjustment; and configuring the output time-slot space-division cross path from the time-division module after adjustment in space-division module; deleting the original cross path formed by the time-division module before adjustment. The apparatus comprises: a first configuration unit used to configure the input time-slot space-division cross path to the time-division module after adjustment in space-division module and the time-division cross path of the time-division module after adjustment; a second configuration unit configuring the output time-slot space-division cross path from the time-division module after adjustment in the space-division module; deleting the original cross path formed by the time-division module before adjustment.10-13-2011
20100254708Laser wavelength stabilization - A method includes transmitting a plurality of time-division-multiplexed return channels from a plurality of optical network terminal outputs to a plurality of cable modem termination system inputs. Transmitting the plurality of time-division-multiplexed return channels includes transmitting a plurality of frequency-division-multiplexed return signals from the plurality of optical network terminal outputs to the plurality of cable modem termination system inputs. An apparatus includes a plurality of optical network terminals; an optical receiver coupled to the plurality of optical network terminals; an optical splitter coupled to the optical receiver; a plurality of cable modem termination system inputs. A plurality of time-division-multiplexed return channels are transmitted from the plurality of optical network terminals to the plurality of cable modem termination systems and the plurality of time-division-multiplexed return channels include a plurality of frequency-division-multiplexed return signals.10-07-2010
20090310970NETWORK TIMING - The subject matter disclosed herein relates to synchronizing network timing. In one particular example, network timing may be synchronized using reflected signals.12-17-2009
20080205891Method for Processing Overheads of Optical Communication System and Signal Processing Device - A method for processing overheads in an optical communication system and a signal processing device are disclosed. The method includes: in a receiving direction, conduct an O/E and S/P conversion for the received optical signal, extract overheads necessary for overheads processing; transmit the overheads in serial; conduct an S/P conversion of the overheads, add fixed reserved overheads, and revert the parallel overheads for overheads processing; in a transmitting direction, generate parallel overheads, extract overheads necessary for overheads processing; transmit the overheads in serial; conduct an S/P conversion of the overheads, revert the overheads, synthesize the overheads with the payload data before the P/S and E/O conversion, and generate and transmit the optical signal. In accordance with the disclosed method and device, a serial bus is employed to transmit overheads, which reduces the number of buses on the motherboard and lowers the complexity of system design.08-28-2008
20100215373Method and apparatus for generating time-division multiplexed encoded transmission signal - The present invention provides a method of generating time-division multiplexed encoded transmission signals, including encoding optical pulse signals for each of a plural multiplexed channels and generating a transmission signal for each channel, performing time division multiplexing on first and second transmission signals and generating a 2-channel multiplexed signal modulating the multiplexed signal with a modulation signal having a frequency of (F−Δf) Hz, detecting a strength of a Δf Hz frequency component of the multiplexed signal changing a time delay amount of the second transmission signal with respect to the first transmission signal, and determining a time delay amount at which a strength of the Δf Hz frequency component is minimized and adjusting the transmission signals of the individual channels such that they are arranged at equidistant intervals on a time axis.08-26-2010
20100215374SYSTEM, APPARATUS AND METHOD FOR COMMUNICATING DATA VIA POLARIZATION MULTIPLEXING - Systems, apparatus and method for modulating digital data onto an optical carrier to produce a modulated optical carrier in which symbol-modulated optical signals of orthogonal polarizations are temporally interleaved and adapted to be processed by electronic time-division demultiplexing to recover the digital data modulated onto the orthogonal polarizations of the optical signals.08-26-2010
20100028009METHOD AND SYSTEM FOR DATA SYNCHRONIZATION IN PASSIVE OPTICAL NETWORKS - A system and method for data synchronization in Passive Optical Networks are disclosed. According to an embodiment, the present invention provides a method for providing upstream data synchronization in an optical communication network. The method includes sending data from an Optical Network Unit. The data includes a first data frame, which includes a header sequence, a synchronization segment, and a data segment. The synchronization segment includes 66 bits, which includes a first number of bits having nonzero values and a second number of bits having a value of zero. The first number is different from the second number. The method further includes receiving at least the first data frame by an Optical Line Terminal. The method also includes processing the first data frame. The method additionally includes selecting a first segment of the first data frame, the first segment including 66 bits.02-04-2010
20100021172Transporting Upstream Data in a Passive Optical Network - Upstream data handling in a digital Data Over Cable Service Interface Specification (DOCSIS) passive optical network (DPON). Embodiments include receiving at a headend, in an upstream path over an optical network, a plurality of digitized and serialized DPON upstream packets respectively distributed in a time division multiplexed fashion, wherein each DPON upstream packet includes a header, a trailer and a payload, monitoring the optical network for energy in the upstream path, including energy associated with a header and a trailer of respective DPON upstream packets, controlling a bit stuffer that adds bits to the upstream path to (1) stop adding bits to the upstream path when energy is detected in the upstream path and (2) resume adding bits to the upstream path after an end of a trailer of a given DPON upstream packet has been detected, and removing the header and the trailer of the respective DPON upstream packets. The resulting original payload is then digital to analog converted, and the resulting data is passed to, e.g., a cable modem termination system (CMTS).01-28-2010
20090123154DETECTING PRESENCE OF ROGUE ONU - A system, method, and computer readable medium comprising instructions for rogue Optical Network Unit (ONU) detection by analyzing the frequency content are provided. Once an optical signal is received from an optical network unit, the transition detection unit converts the optical signal to an electrical data signal. The transition detection unit then analyzes the electrical data signal to determine a presence of the rogue optical network unit. To determine presence of a rogue ONU, the transition detection unit may digitally oversample the data, filter the data with a high pass filter or measure the received signal strength.05-14-2009
20120045214METHOD AND APPARATUS FOR BURST MODE CLOCK AND DATA RECOVERY - Provided is an optical line terminator (OLT) to recover packet data and a clock from an optical signal including a silent interval. The OLT may receive packet data and a clock from at least one optical network unit (ONU). Even in a silent interval in which the at least one ONU does not transmit packet data, the OLT may successfully recover the clock.02-23-2012
20120045213TIME DIVISION MULTIPLEXING TRANSMISSION SYSTEM AND METHOD OF CONTROLLING SYSTEM OF SAME - There is provided a time division multiplexing transmission system which is capable of increasing the transmission efficiency. The system comprises OLT 02-23-2012
20120155882FLEXIBLE, DENSE LINE CARD ARCHITECTURE - The disclosure relates to optical fiber transmission systems, and in particular, pertains to the transceiver cards in an optical fiber transport system. In particular the disclosure teaches an improved transceiver card architecture that allows high density, flexibility and interchangeability of functionality.06-21-2012
20120207480OPTICAL SIGNAL CONTROLLING APPARATUS AND METHOD, AND OPTICAL SIGNAL GENERATING DEVICE INCLUDING THE OPTICAL SIGNAL CONTROLLING APPARATUS - A control section and a signal detection section of an optical modulator are provided for controlling two interferometers (MZI08-16-2012
20100092177Timing Interface Module with Daughter Timing Reference Modules - A timing interface module with daughter timing reference modules. The timing modules are provided in a rack platform to eliminate routing problems and which is compliant with all relevant industry standards. The timing reference module includes a face plate having first and second substantially rectangular openings, the face plate further comprising mounting slots for receiving mounting hardware therein and first and second timing modules, the first and second timing modules disposed within the first and second substantially rectangular openings. The first and second timing modules provide timing terminations for timing reference signals for network elements of a synchronized optical network.04-15-2010
20100247101HIGH FREQUENCY OPTICAL PROCESSING - This invention concerns a high frequency optical processor suitable for time-division demultiplexing and channel dropping data signals at bit rates of 80-160 Gb/s and beyond, and for carving high frequency pulse streams with low duty cycle from an unmodulated laser source. In further aspects the invention concerns methods for using the high frequency optical processor. In particular the invention comprises a high frequency optical processor, comprising a Mach-Zehnder amplitude modulator (MZM) embedded in a fibre mirror loop in which the loop input and output are joined by a polarization maintaining coupler.09-30-2010
20120128363Method and Device for Cross Protection - The present invention discloses an device for cross protection, including: a service unit source end, configured to map optical data unit (ODUk) signals into the same time slots of n line similar optical transport network (OTN) frame format (OTUxG) data buses, and obtain m+n line OTUxG data through protective coding and then send to a combination cross unit; the combination cross unit, configured to split and recombine the m+n line OTUxG data in the time slot, and then send to a service unit destination end; the service unit destination end, configured to protectively decode the m+n line OTUxG data, recover n line OTUxG data, and extract corresponding ODUk signals from the same time slots of n line OTUxG data.05-24-2012
20120134677METHOD AND SYSTEM FOR TRANSFERRING TIME DIVISION MULTIPLEXING SERVICE DATA - The present invention discloses a method and system for transferring TDM services in GPON, the method includes the steps of: in the case of performing the GPON ranging process, buffering the uplink TDM service data received by an optical signal transceiver in an Input Buffer, reading out and transferring the uplink TDM service data buffered in an Output Buffer. The present invention eliminates the possible interruption of TDM services during the GPON ranging process by buffering the uplink services at the OLT and ONU/ONT side and relevant processes, and therefore realizes the TDM service transmission without any loss during the GPON system ranging process.05-31-2012
20120224858METHOD AND APPARATUS FOR TRANSMITTING MULTIPLE SERVICES - A method and an apparatus for transmitting multiple services are provided, and which belong to the field of optical transmission technologies. The method includes: receiving bandwidth information of TCONTs of all nodes; dividing a payload area of a GTH frame into a preset number n of arrays, where each array includes a specified number of timeslots and the interval between any two neighboring timeslots in each array is n and n is a natural number; calculating, according to the bandwidth information of the TCONTs of all the nodes, timeslot positions of arrays occupied by the TCONTs of each node in the payload area; interleaving, according to the timeslot positions of the arrays occupied by the TCONTs of a local node in the payload area, the TCONTs of the local node into corresponding timeslots starting from a specified frame, obtaining a GTH frame, and transmitting the GTH frame.09-06-2012
20120224857BANDWIDTH ADJUSTING METHOD AND COMMUNICATION NODE - A bandwidth adjusting method and a communication node are provided. The adjusting method includes: sending, by an upstream ingress unit, a group of multi-channel parallel basic switch cells in which adjustment signaling is carried to all downstream branch egress units; sending normal signaling when determining that adjustment response statuses returned by all the downstream branch egress units are reception acknowledgment; after receiving the normal signaling by the downstream branch egress unit, adding or removing the basic switch cell into or from a next group of multi-channel parallel basic switch cells according to the adjustment signaling; and adjusting a time slot of an HO ODU sent by the downstream branch egress unit to a downstream node, and instructing the downstream node to adjust the time slot of the HO ODU. Through the method and the communication node, lossless bandwidth adjustment in a point-to-multipoint OTN asymmetric bandwidth carrier system is implemented.09-06-2012
20120315048MOBILE LOCATION IN A REMOTE RADIO HEAD ENVIRONMENT - A base station includes an antenna, a radio transceiver, an optical splitter, an optical-to-electrical converter, and a computation module. The antenna may be mounted to a tower and may be configured to receive an RF signal. The radio transceiver may be coupled to the antenna and mounted near the top of the tower. The transceiver may be configured to convert the RF signal to a baseband signal for transmission over a fiber optic link as a first optical signal. The splitter may be configured to split the first optical signal, received via the fiber optic link, into a second optical signal and a third optical signal. The optical-to-electrical converter may be configured to convert the second optical signal into an electrical digital signal including in-phase and quadrature (I/Q) data. The computation module may be configured to compute, based on the I/Q data, signal measurements for location of a mobile station.12-13-2012
20120177374QUANTUM COMMUNICATION SYSTEM - A quantum communication system including a sending unit and a receiving unit, said sending unit comprising a photon source assembly configured to output a stream of pulses of light having at least two different intensities and a memory configured to store information for determining which pulses should be reference pulses and which pulses should be data pulses, the average intensity of reference pulses being different to the average intensity of data pulses, the receiving unit comprising a memory for storing information for identifying the position of reference pulses within the stream of pulses and a processor for determining the calibration of the quantum communication system from the reference pulses.07-12-2012
20120257900Timing Interface Module with Daughter Timing Reference Modules - A timing interface module installs within a rack to increase bandwidth. The timing interface module receives a reference timing signal and outputs the reference timing signal to an optical multiplexer. The optical multiplexer also receives multiple data streams of different formats, and the optical multiplexer synchronizes the multiple data streams to the reference timing signal.10-11-2012
20080298807SYSTEMS AND METHODS FOR INTERFERENCE PREDICTION - An optical network device of a passive optical network is introduced. The optical network device includes a light source, a control unit, and a variable optical attenuator. The light source can generate an optical signal. The control unit can generate a magnetic signal based on a control signal capable of providing information relating to a distance between the optical network device and an optical line termination. The variable optical attenuator can adjust a polarization angle of the optical signal based on the magnetic signal.12-04-2008
20100232798BIT IDENTIFICATION CIRCUIT - A bit identification circuit includes a multiphase clock generating unit that outputs multiphase clocks, a phase selecting unit that samples the input data signals using the multiphase clocks and selects a sampled result out of a plurality of sampled results, a correcting unit that thins a part of bits of the sampled result selected by the phase selecting unit based on the difference in bit rates, and a rate selecting unit that selects based on a selection signal for identifying the data signals and outputs one of an output of the correcting unit and an output of the phase selecting unit.09-16-2010
20130011142SYSTEMS AND METHODS FOR EXTENDING OPTICAL NETWORK SERVICES ACROSS NON-OPTICAL CHANNELS - An optical communication system comprises a network interface device (NID) having a media converter coupled to an optical fiber of a passive optical network (PON). The media converter converts optical signals from the PON into electrical signals for communication across at least one non-optical channel, such as a conductive or wireless connection, to customer premises equipment (CPE), such as a residential gateway or other customer premises (CP) device. Rather than implementing an optical media access control (optical MAC) layer in the NID, an optical MAC layer for handling PON protocols and management is implemented by the CPE, thereby effectively extending the customer end of the PON across at least one non-optical connection to the CPE. By implementing the optical MAC layer at the CPE, the complexity of the NID is reduced thereby lowering the cost of the NID. In one embodiment, in an effort to further reduce the complexity of the NID, the optical MAC layer is configured to control a laser-on state of an optical transmitter in the NID.01-10-2013
20110158651METHOD AND APPARATUS FOR FILTERING LOCKING - In the field of photonic integrated communication, a method and an apparatus for filtering locking are provided, so as to solve the problem in the conventional wavelength locking technology that any increase of the wave number also incurs increases in costs and circuit complexity, and it is difficult to extract dithered information. The method and apparatus for filtering locking employ a centralized wavelength locking method of injecting a single dither to a Photonic Integrated Device (PID)/Photonic Integrated Circuit (PIC), thereby reducing circuit board area and control circuit complexity. A weak dither signal can be accurately extracted by means of a combination of analog filtering and digital filtering. The technical solution is appropriate for use in photonic integrated systems in which two or more PID/PIC chips with multi-wavelength modules are cascaded.06-30-2011
20130170838TRANSMISSION DEVICE, TRANSMISSION METHOD, AND PROGRAM - A cross connecting unit outputs an including frame whose type matches a type of an including frame stored in a storage unit in association with identification information of a multiplexing unit having a problem among including frames generated by an including unit to a backup multiplexing unit when any one of multiplexing units has a problem.07-04-2013
20090202249PON (PASSIVE OPTICAL NETWORK) STATION SIDE APPARATUS, PON UPLINK LINE COMMUNICATION METHOD, AND PROGRAM RECORDING MEDIUM - A PON station side apparatus is provided with a selection section and a receiving section. For multiple data transferred from multiple PON terminal apparatuses that transmit data at different communication speeds in time division multiplexing, the selection section selects any of the multiple receiving circuits to be a receiving circuit for a receiving destination at which data is received on the basis of the transmission time zones for the data. The receiving section switches the receiving circuit selected by the selection section among the multiple receiving circuits to be the receiving circuit for the destination at which data is received of the data and receives the data through the switched receiving circuit.08-13-2009
20100074624System and Method for Transporting Asynchronous ODUk Signals over a Synchronous Interface - System and methods are provided, in an Optical Transport Network (OTN), for communicating asynchronous Tributary Slots (TSs) via a synchronous Optical Payload Transport Unit of level k (OTUk) interface. The transmission method accepts a plurality of TSs at a corresponding plurality of asynchronous data rates. The TSs are mapped, using a tangible memory medium, into pseudo-Optical channel Data Tributary Unit (ODTU) frames synchronized to a common clock. Then, the synchronized pseudo-ODTU frames can be interleaved into an OTUk frame, without the need of a phase-locked loop (PLL) or buffering.03-25-2010
20100316387SYSTEM AND METHOD FOR ENERGY-EFFICIENT OPERATION OF OPTICAL NETWORK UNITS BASED ON SCHEDULED PAYLOAD RECEPTION - In a passive optical network, power consumption of the ONU can be reduced by communicating a transmission schedule from the OLT to the ONU that indicates time slots in which the ONU is scheduled to receive payload transmissions from the OLT. Components of the ONU that would normally operate continuously, including processing payloads addressed to other ONUs, are placed in a reduced power state outside of the ONU's allocated time slots.12-16-2010
20120281985TRANSMITTING APPARATUS AND SIGNAL TRANSMITTING METHOD - A transmitting apparatus includes a frame dividing circuit that maps frame data of each of a plurality of frames whose period is different from each other into one or a plurality of internal frames having a fixed frame period and a fixed transmission rate, based on a predetermined internal clock; a cross-connect circuit that cross-connects the frame data of each in a time division multiplexing system based on the internal clock in units of the internal frames; and a frame combining circuit that demaps, into any of the plurality of frames, or multiplexes, data of one or a plurality of internal frames cross-connected by the cross-connect circuit.11-08-2012
20120027413High-Speed Transmission System for Optical Channels - A method and apparatus for transmission of data on bandwidth limited fiber optic channels. A multilevel signaling alphabet having multiple levels of optical intensity are used to transmit signals on optical channels. In order to counteract the decrease in signal to noise ratio resulting from the use of a multilevel signaling alphabet over a bilevel signaling alphabet trellis encoding of the data to be transmitted is employed. To counteract intersymbol interference due to signaling faster than the Nyquist Rate, equalization methods such as Tomlinson-Harashima preceding and decision feedback equalization are employed.02-02-2012
20130202304Ethernet Passive Optical Network Over Coaxial (EPOC) Physical Layer (PHY) Link Up and Tuning - Example registration procedures for Ethernet Passive Optical Network Over Coax (EPOC) are provided. The procedures are compliant with the Ethernet Passive Optical Network (EPON) standard. The procedures cover initial coaxial media converter (CMC) registration; physical layer discovery and link up over a coaxial link of an EPOC network; and medium access control (MAC)-level discovery and link up over an EPOC network. As such, the procedures can he used to fully bring air EPOC network to user traffic readiness. In addition, the procedures, or a variation thereof, can be used to enable periodic maintenance of the coaxial link of the EPOC network, thereby maintaining adequate communication conditions over the coaxial link.08-08-2013

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