Abstract: Disclosed are a data transmission method and apparatus, a terminal device, and a storage medium. The data transmission method includes: determining a basic unit carrying client data, wherein a rate of the client data is less than a set value determined according to a rate of a carrying container of an optical transport network (OTN) frame, and the basic unit is a basic unit contained in a basic unit set; mapping the client data to the basic unit; and sending, through the OTN frame, the basic unit set to which the client data is mapped.

Abstract: An optical transmitter transmits a data signal. The optical transmitter has an encoder configured to encode the data signal by selecting based on a bit sequence a first symbol and a second symbol from a set of four symbols for each one of at least two transmission time slots. The optical transmitter further has a modulator configured to use in each transmission time slot the first symbol to modulate a first carrier wave and the second symbol to modulate a second carrier wave, and to transmit the two carrier waves over orthogonal polarizations of an optical carrier. Symbols in consecutive transmission time slots have non-identical polarization states.

Abstract: Methods, devices and systems for providing accurate measurements of timing errors using optical techniques are described. An example timing measurement device includes an optical hybrid that receives two optical pulse trains and produces two or more phase shifted optical outputs. The timing measurement device further includes two or more optical filters that receive the outputs of the optical hybrid to produce multiple pulse signals with distinctive frequency bands. The device also includes one or more photodetectors and analog-to-digital converters to receive to produce electrical signals in the digital domain corresponding to the optical outputs of the hybrid. A timing error associated with the optical pulse trains can be determined using the electrical signals in digital domain based on a computed phase difference between a first frequency band signal and a second frequency band signal and a computed frequency difference between the first frequency band signal and the second frequency band.

Abstract: A method implemented by an optical line terminal (OLT) comprising a memory storage comprising instructions, a processor in communication with the memory, wherein the processor executes the instructions to generate a multi-rate downstream frame having a pre-defined length, the multi-rate downstream frame comprising a plurality of subframes that are each associated with a respective data rate, and a transmitter coupled to the processor and configured to transmit each subframe of the plurality of subframes of the multi-rate downstream frame at the respective data rate.

Abstract: An optical transmitter transmits a data signal. The optical transmitter includes an encoder configured to encode the data signal by selecting based on a bit sequence, a first symbol and a second symbol from a set of four symbols for each one of at least two transmission time slots. The optical transmitter further includes a modulator configured to use in each transmission time slot the first symbol to modulate a first carrier wave and the second symbol to modulate a second carrier wave, and to transmit the two carrier waves over orthogonal polarizations of an optical carrier. Symbols in consecutive transmission time slots have non-identical polarization states.

Abstract: Embodiments of the present disclosure relate to a method, a device, an apparatus for optical communication and computer-readable medium. The method comprises receiving, at an optical line terminal, an access request from a first optical network unit; in accordance with a determination that the first optical network unit is not registered at the optical line terminal, obtaining a first parameter set from the first optical network unit, and updating an association relationship between a distorted signal received at the optical line terminal and an original signal recovered from the distorted signal, based on the first parameter set.

Abstract: A method of scheduling transmission of a data flow in a data center network comprising a plurality of network nodes and links. The method comprising, at a network controller receiving (14) a transmission request for a data flow, obtaining (15) a tolerated time interval for the data flow, and scheduling (16) transmission of the data flow within the tolerated time interval and without contention with other transmissions.

Abstract: [Object] To enable multiplexing configurations of a plurality of uplink control channels in a preferred mode in a communication system in which a base station device and a terminal device communicate with each other. [Solution] A communication device includes: a communication unit configured to perform wireless communication; and a control unit configured to selectively switch between a first physical channel and a second physical channel in which both conditions of the number of symbols and the number of resource blocks are different from each other and which are allocated during a predetermined period in a time direction to transmit control information to a base station.

Abstract: Systems and methods of network resource optimization based on time-varying traffic in an optical network with a filterless architecture include determining traffic variations based on the time-varying traffic in the optical network; and adjusting one or more of transceivers and wavelengths between nodes in the optical network based on the traffic variations and using the filterless architecture. The adjusting minimizes the number of the transceivers and the wavelengths based on the traffic variations and the time-varying traffic. The optical network can geographically span multiple time zones, contributing to the time-varying traffic.

Abstract: A housing for packaging an optical transmitter module includes a body, a focusing structure, a first three-dimensional (3D) optical waveguide, and an optical fiber interface. The optical fiber interface is located inside the body and configured to accommodate a single-mode optical fiber. The first 3D optical waveguide is embedded in the body. The focusing structure is configured to receive a first single-mode optical signal and enable the received first single-mode optical signal to be focused for a first time at a focal point of the focusing structure. The first 3D optical waveguide is configured to receive the first single-mode optical signal, and output the first single-mode optical signal to the single-mode optical fiber. The focal point of the focusing structure coincides with an input end of the first 3D optical waveguide.

Abstract: A data center network node (13) comprising a first data connection (22) for connecting at least one server to a conventional subnetwork comprising at least one of a switch or a router, an optical transceiver (14) comprising a transmitter (16) and a receiver (17), a second data connection (23) for connecting the at least one server to the optical transceiver, a switching arrangement (21) for linking the optical transceiver (14) to an offload subnetwork (10), the switching arrangement configurable between a first configuration (24) in which the offload subnetwork bypasses the optical transceiver and a second configuration (28) in which the optical transceiver is optically linked to the offload subnetwork.

Abstract: Systems and methods for Optical Transport Network (OTN) transmission include receiving an OTN client signal for transmission via a plurality of line side modems; segmenting the OTN client signal into a plurality of flows; providing the plurality of flows to the plurality of line side modems, wherein the OTN client signal is a single client which is transmitted optically via the plurality of line side modems which are each different line interfaces. The OTN client can be an Optical channel Transport Unit (C=100)×n (n=1, 2, 3, . . . ) OTUCn.

Abstract: In example implementations, an apparatus includes a serializer, a re-timing buffer coupled to the serializer, and a plurality of segments coupled to the re-timing buffer. The plurality of segments may be used for controlling a timing of an electrical signal. Each one of the plurality of segments may include a segment serializer, a timing control coupled to the segment serializer and a driver coupled to the timing control. In addition, a phase clock may be coupled to the segment serializer and the timing control of each one of the plurality of segments.

Abstract: An optical WDM system configured to use direct detection of communication signals that is compatible with electronic CD compensation on a per-channel basis. In an example embodiment, to enable full (e.g., amplitude and phase) electric-field reconstruction at the receiver, the optical WDM system uses a carrier-frequency plan according to which the carrier-frequency comb used at one end of the WDM link and the carrier-frequency comb used at the other end of the WDM link are offset with respect to one another by one half of the bandwidth of an individual WDM component transmitted therethrough. This frequency offset places each local carrier frequency at a roll-off edge of the corresponding incoming data-modulated signal. As a result, the corresponding combined optical signal beneficially lends itself to direct detection that can be followed by full electric-field reconstruction using a known self-coherent Kramers-Kronig method and then by conventional electronic CD compensation.

Abstract: The invention relates to an all-optical regeneration system for regeneration of optical wavelength division multiplexed WDM data signals in an optical WDM communication system. The system comprises a WDM-to-Optical time domain multiplexing OTDM, WDM-to-OTDM, converter, capable of converting an input WDM data signal comprising multiple wavelength channels into an input OTDM data signal comprising multiple time multiplexed time channels. The system further comprises an all-optical regenerator unit being configured for regenerating the input OTDM data signal into an output OTDM data signal. The system additionally comprises an OTDM-to-WDM converter for converting the output OTDM data signal to an output WDM data signal. An input of the all-optical regenerator unit is in optical communication with an output of the WDM-to-OTDM converter, and an output of the all-optical regenerator unit is in optical communication with an input of the OTDM-to-WDM converter.

Abstract: The present invention provides a method of transferring content from a file and a database. In this case, the file includes content instances, each content instance being associated with a respective field, and each field having a respective type. The transfer is achieved by determining the type of each field, and then storing each content instance in a store in accordance with the determined field type of the associated field. Each content instance can then be transferred to the database in accordance with the determined field type. A similar procedure is provided for creating XML files based on content within the database.

Abstract: One or more remote radio probes (RRPs) may be installed in the fronthaul network of a cellular Radio Access Network. Each RRP may be designed as to be permanently, or semi-permanently, placed in the fronthaul network. The RRP may be designed to capture baseband radio data transmitted through the fronthaul network. The RRP may buffer and forward the captured baseband radio data to an analysis platform. The analysis platform may be a software implemented platform to perform signal and/or spectral analysis of the received baseband radio data.

Abstract: Embodiments of the present invention provide a data processing method, related device, and system for an optical transport network. The data processing method for the optical transport network includes: encapsulating service data into an optical payload unit; mapping the optical payload unit to an optical channel data unit; mapping the optical channel data unit to a payload area of an optical burst transport unit; performing electrical-optical conversion on the optical burst transport unit to form an optical burst transport unit; carrying the optical burst transport unit onto an optical timeslot of an optical burst channel; and transmitting the optical burst channel to a line. Technical solutions provided by the present invention can effectively simplify a data processing process and reduce a data processing delay.

Abstract: A station-side terminal apparatus comprises terminal devices and a terminal device sorting unit. The terminal devices includes: a buffer unit; a subscriber-side terminal apparatus sorting unit configured to transmit a unicast packet addressed to a switch-target subscriber-side terminal apparatus to the switch queues, and transmit a packet addressed to a plurality of subscriber-side terminal apparatuses to the broadcast queue, and transmit a unicast packet addressed to a non-switch-target subscriber-side terminal apparatus to the through queue; and a scheduler unit configured to read a packet from the switch queues, the broadcast queue, and the through queue. The terminal device sorting unit is configured to transmit a received unicast packet to the terminal device, and transmit a received packet addressed to a plurality of subscriber-side terminal apparatuses, to each of the terminal devices.

Abstract: A method, in a network element, for detecting and propagating resizability information of an Optical channel Data Unit flex (ODUflex) connection includes receiving resizability information in overhead associated with the ODUflex connection, wherein the resizability information indicates a number of available tributary slots and whether the ODUflex connection is symmetric; and adjusting the resizability information based on a change in the available tributary slots due to a bandwidth change at the network element. The systems and methods include a solution to communicate, in real time, the resizability information of an ODUflex connection utilizing the associated data path to carry it instead of the management/control plane.

Abstract: A burst-mode TIA circuit for use in PON receivers is provided that supports multiple data rates, has high receiver sensitivity, wide dynamic range, and that performs burst-mode synchronization very quickly. The multi-rate burst-mode TIA circuit has a high-speed data path that has low input-referred noise. Based on the chosen data rate at which the multi-rate burst-mode TIA circuit will operate, the rate select switch selects an appropriate feedback resistor of the resistive feedback network.

Abstract: An OTDM coherent transceiver and related methods and apparatus that employ a pulsed source which advantageously allows higher symbol rates without requiring higher speed electronics.

Abstract: This application discloses apparatuses and methods for selecting and tuning of a select mode of a multi-longitudinal mode device seeded or wavelength locked to a spectrum-sliced external wavelength by either self-seeding or broadband light-source seeding through an array-waveguide grating.

Abstract: An apparatus (104) mitigates cross-channel nonlinear distortion of an optical signal (138) carried on one of a plurality of wavelength channels (118) in a wavelength division multiplexed (WDM) transmission system (100). The apparatus includes a first optical receiver (126) which is arranged to detect a measure (134) of aggregate optical power of the plurality of wavelength channels. A nonlinear dispersion compensator includes means (144) for applying a phase modulation to the optical signal in proportion to the measure of aggregate optical power.

Abstract: Provided is a station-side apparatus configured to conduct optical communication with a plurality of subscriber apparatuses via a plurality of wavelengths. The station-side apparatus includes a storage apparatus, management information stored in the storage apparatus and configured to indicate whether or not a subscriber apparatus is a first apparatus whose wavelength used for communication is changed to another wavelength, and a transmission unit configured to transmit downlink frames addressed to the plurality of subscriber apparatuses in an order of transmission determined based on the management information.

Abstract: A modulator bias selection method, a coherent optical transmitter, and optical modulator solve the problem of generating a correct constellation using the bias points with the minimum phase adjustment range. The optimum modulator bias systems and methods include a coherent optical transmitter with control of four (XI, XQ, YI, YQ) quadrature data signals via a transmitter (Tx) application specific integrated circuit (ASIC), with a modulator bias controller which implements an algorithm to find the optimum bias points. The optimum bias points yield a correct constellation with minimum phase/bias adjustment. An algorithm is used to find the optimum bias solution using fast, simple method, adjusting only one quadrature at a time and exploiting a control feature of the Tx ASIC. This algorithm is significantly simpler than a generalized search, is a local algorithm, and uses only DC power measurement at the transmitter.

Abstract: Radio blocs (BRjp) shared in a predetermined frequency band during a periodic radio frame (TRi) between base stations (BS) are allocated to applications in base stations and mobile stations. Each radio block spreading on frequencies (Cj) of said band during a time slot (M?t) of the radio frame and can be associated with an uplink or a downlink. To meet quality-of-service parameters required by an application, a base station estimates occupation rates of the radio blocks during consecutive radio frames, and allocates to the application at least one radio block having an occupation rate less than a threshold and a periodicity expressed in period of frame and depending on the required quality-of-service parameters. The base station are autonomous for the radio block allocations.

Abstract: A root node of a decision tree data structure may cover all values of a search space used for packet classification. The search space may include a plurality of rules, the plurality of rules having at least one field. The decision tree data structure may include a plurality of nodes, the plurality of nodes including a subset of the plurality of rules. Scope in the decision tree data structure may be based on comparing a portion of the search space covered by a node to a portion of the search space covered by the node's rules. Scope in the decision tree data structure may be used to identify whether or not a compilation operation may be unproductive. By identifying an unproductive compilation operation it may be avoided, thereby improving compiler efficiency as the unproductive compilation operation may be time-consuming.

Abstract: A signal generating method and apparatus in the field of signal technologies are provided. The method includes: adjusting an incident angle of an optical signal entering a polarization beam splitter, so that the polarization beam splitter outputs a first optical signal and a second optical signal that have a preset power ratio; performing QPSK modulation on the first and second optical signal respectively by using a first and second externally input data streams, to obtain a first and a second QPSK optical signal; before the first QPSK optical signal and the second QPSK optical signal are input into a polarization beam combiner, adjusting a polarization state of the first or the second QPSK optical signal; when the polarization states of the two QPSK optical signals are the same, outputting a 16QAM signal; and when the polarization states of the two QPSK optical signals are orthogonal, outputting a DP-QPSK signal.

Abstract: In the present invention, wasted power consumption caused when a clock and data recovery unit in an optical network unit in a PON system is activated from a power-saving state is reduced and rapid, secure communication is performed. A clock and data recovery unit includes a phase-locked loop that can be set to normal mode or power-saving mode and that includes a voltage-controlled oscillator and recovers a clock signal and a data signal from input signals. The clock and data recovery unit includes a reference clock multiplier circuit that multiplies a reference clock signal and outputs the multiplied reference clock signal; and a frequency training loop that includes the same voltage-controlled oscillator and performs synchronous oscillation training by the voltage-controlled oscillator using the reference clock multiplier circuit before the phase-locked loop transitions from power-saving mode to normal mode.

Abstract: The present application provides a method for time division multiplex service protection. The method includes: on an OLT in a passive optical network, a working uplink port and a protection uplink port are set for a time division multiplex service and a protection group is created for the working uplink port and the protection uplink port; when a service flow protection for the time division multiplex service is triggered, the time division multiplex service flow is switched from the working uplink port to the protection uplink port, therefore realizing the protection for the time division multiplex service flow. The present application provides an uplink channel protection mechanism for important services in an access system, such as the time division multiplex service, which needs no protection switching protocol, and makes the service recovery time stand within 50 ms, thereby realizing fast and nondestructive recovery of the time division multiplex service.

Abstract: A method for establishing an end-to-end service is provided in the present invention, which includes: acquiring link information in a network and multi-stage multiplexing capability constraint information supported by gateway network elements; when an end-to-end path computation request is received, according to the link information and the multi-stage multiplexing capability constraint information, performing an end-to-end routing computation to acquire an end-to-end routing, and selecting a multi-stage multiplexing capability used on a gateway network element passed by the end-to-end routing; and configuring the end-to-end service, and configuring the selected multi-stage multiplexing capability on the gateway network element passed by the end-to-end routing. A system for establishing the end-to-end service, an optical transport network and a signal transmission method thereof are also provided in the present invention, which can all implement the interconnection between new networks and old networks.

Abstract: An apparatus is provided that includes n communication channels, and m communication media interfaces, and v virtual lanes. V is a positive integer multiple of the least common multiple of m and n. An information stream is transferred into data and alignment blocks striped across all of the v virtual lanes, the blocks being communicated from the virtual lanes onto the communication channels. The blocks are received on the communication channels. Each of the communication channels transmits a different portion of the blocks striped across all of the v virtual lanes. In more particular embodiments, v>=n>=m. The communication media interfaces can be electrical and optical. Each of the communication channels can include a SerDes interface operating at least 5 Gigabits per second. Furthermore, each of the m communication media interfaces is configured to transmit a different stream of information over a single optical fiber.

Abstract: 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.

Abstract: 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.

Abstract: The disclosure discloses a Generic Mapping Procedure (GMP) mapping method for an Optical channel Data Unit (ODU), including: caching low-level ODUk data to a memory according to the rate of low-level ODUk data stream; generating an adjustment byte in a mapping process and encoding the adjustment byte; generating read enable of the cached data by an algorithm according to the adjustment byte, reading the cached low-level ODUk data, and generating Optical channel Data Tributary Unit (ODTU) data according to the read data; and crossing a time slot of the ODTU data in multiple channels to that of a high-level ODU payload, and forming the data in the time slot of the high-level ODU payload and the encoded adjustment byte into a completed high-level ODU frame. The disclosure may further provide a GMP mapping apparatus for an ODU. According to a technical solution of the disclosure, the GMP mapping of the ODU can be implemented according to the dynamic change of a service rate.

Abstract: An apparatus comprising a transmitter configured to generate an optical signal comprising a carrier modulated with at least two sidebands modulated with information, wherein the information introduces a separation gap in a frequency domain between the sidebands and the carrier, wherein one of the sidebands is an undesired sideband and another one of the sidebands is a desired sideband with a higher power intensity than the undesired sideband. A method comprising receiving an optical carrier from a light source and modulating the optical carrier with at least two sidebands modulated with information, wherein the information introduces a separation gap in a frequency domain between the sidebands and the optical carrier, wherein one of the sidebands is an undesired sideband and another one of the sidebands is a desired sideband having a higher power intensity than the undesired sideband.

Abstract: An optical apparatus receives an upward signal light from a plurality of subscriber units, where the upward signal light is composed of a plurality of time slots corresponding to the plurality of optical subscriber units. The optical apparatus includes a driving unit configured to determine a respective required gain for light from each of the plurality of optical subscriber units, an amplifying section configured to amplify the upward signal light with the required gain corresponding to the time slots of the upward signal light, and a receiver configured to receive the amplified upward signal light.

Abstract: A transmission device includes: a signal receiving part configured to receive a time division multiplexing signal in which a plurality of packets are stored; a separating part configured to separate the plurality of packets from the time division multiplexing signal; an assigning part configured to assign an identifier corresponding to a stored position in the time division multiplexing signal to each of the plurality of packets; and a packet transmitting part configured to transmit at least two packets having different identifiers out of the plurality of packets through a common transmission path.

Abstract: Disclosed is a passive optical network system using a time division multiplexing scheme. According to one exemplary embodiment, the passive optical network system includes a plurality of optical network units (ONUs); an optical line terminal (OLT) to be connected to the plurality of ONUs for communication and to transmit and receive an optical signal to and from the plurality of ONUs using a time division multiplexing (TDM) scheme, wherein each of the plurality of ONUs includes a light source that generates an optical signal with a predetermined intensity even in burst-off state; and an optical filter disposed on a receiving path of an optical receiver of the OLT to filter out an optical noise signal received from an ONU in burst-off state among the plurality of ONUs.

Abstract: 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.

Abstract: A system and method for managing the optical layer network data communications of an optical fiber data network by an optical transceiver module is disclosed. The management of the optical layer network data communications comprising data link layer functions or layer 2 functions in an OSI model. Benefits include reduction in reduced cost of network deployments from consolidation of network equipment, such as switches, and reduction in power consumed as well as enabling point-to-multipoint network connections from previously only point-to-point network connection.

Abstract: An optical network device re-routes traffic from a path to a backup path in response to determining that a downstream segment of the primary path is not operational. The optical network device receives traffic on a slot of an optical fiber. For each data unit in the traffic, the optical network device determines, based on receiving the data unit on the slot and based on a flow identifier specified in the data unit, that a given path is associated with the data unit. If a downstream segment of the given path is not operational, the optical network device routes the data unit onto a backup path instead of routing the data unit along the given path. Bandwidth is not reserved for the backup path.

Abstract: A technique for providing time division multiplexing (“TDM”) and wavelength division multiplexing (“WDM”) communication services to customer premises (“CP”) over a passive optical network (“PON”) includes multiplexing a downstream TDM signal with downstream WDM signals onto a fiber trunk line coupled between a central office and a remote node (“RN”), separating the downstream WDM signals from the downstream TDM signal at the RN with a wavelength selective filter, power splitting the downstream TDM signal at the RN onto a plurality of fiber access lines as split TDM signals; and recombining each of the WDM signals with a corresponding one of the split TDM signals onto a corresponding one of the fiber access lines.

Abstract: A manner of providing for testing of access fibers in a PON (passive optical network) using OTDR (optical time-domain reflectometry). According to the invention, a PON includes an optical splitter module having one or more optical couplers that combines downstream light from 1×N optical splitter directing the output of an OLT (optical line terminal) and a cyclic AWG (arrayed waveguide grating) for transmission toward one or more ONUs (optical network units). The splitter module is preferably formed on a single semiconductor chip, such as a PIC (photonic integrated circuit) chip and may reside in an outside plant of the PON.

Abstract: A method for communicating in a passive optical network (PON), includes receiving traffic from a plurality of optical network units (ONUs) transmitting in an upstream transmission channel, wherein each of the ONUs may transmit at any wavelength within a wavelength band associated with the upstream transmission channel. The method also includes dividing the upstream transmission channel into a plurality of sub-channels, that each include a subset of the wavelength band associated with the upstream transmission channel. The method further includes determining the identity of each of the plurality of ONUs transmitting in each of the sub-channels, assigning a plurality of ONUs transmitting in the upstream transmission channel to each of at least two of the sub-channels based on the determination of the ONUs transmitting in that sub-channel, and allocating transmission timeslots for time-shared transmission by the ONUs in one or more of the sub-channels.

Abstract: A bandwidth allocator for communicating with communication terminals by transmitting and receiving data packets over a line having its communication bandwidth divided into periods of time of a predetermined length. The allocator includes a controller controlling allocation of the bandwidth by using allocation grants as the periods of time. The controller includes a scheduler scheduling the allocation grants so as to cause one allocation grant to partially overlap as a shared grant with another allocation grant adjacent to the one allocation grant. Thus, the bandwidth allocator can minimize allocation loss, otherwise caused by no allocation to an allocation grant, and improve the use efficiency of the bandwidth.

Abstract: There is provided an office-side line concentration device that accommodates a plurality of passive optical networks, including a plurality of receiving means connected to each of the plurality of passive optical networks, and interface means for controlling a transmission timing of user data from the plurality of passive optical networks so that user data received by the plurality of receiving means can be arranged closely in an uplink, thus enabling effective use of bandwidth in the uplink.

Abstract: Instant discloser is a method to transmit multiple data-streams of varying capacity data using Virtual Concatenation (VCAT) over Synchronous Digital Hierarchy (SDH) network, comprising acts of determining number of data bytes to be requested for each Virtual Concatenation Group (VCG) in a row-time of the aggregated bandwidth and storing it in a VCG request configuration memory, reading the requested number of data bytes from each data-stream in order in to a Row Buffer for each row time of an SDH frame, reading data stored in the Row Buffer from memory address determined by one or more connection memory wherein the connection memory is programmed to carry out sequencing of bytes of the Row Buffer based on the VCAT numbering, and inserting path overhead (POH) and pointer information in to the read data streams in previous step to transmit multiple data-streams of varying capacity data using VCAT over SDH network.

Abstract: An optical transmitter converts a plurality of transmission signals transmitted via a plurality of lanes into a multi-carrier signal and transmits the multi-carrier signal. The optical transmitter includes: a controller configured to generate allocation information that indicates an allocation of sub-carriers to the plurality of lanes according to a bit rate of the transmission signal of each of the lanes and a possible transmission capacity of each of the sub-carriers; and a signal processor configured to convert the plurality of transmission signals into the multi-carrier signal in accordance with the allocation information generated by the controller.