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

An OLT 110 includes an optical transmission/reception unit 111 to transmit and receive optical signals by time division; an abnormal-light-emission detection unit 112 to monitor the received optical signals, and detect a state in which the optical signals are being received for a predetermined period or longer as abnormal light emission in which the optical signals from one or more of the ONUs 130 are not received; an optical-communication control unit to sequentially select an ONU 130 one at a time from the plurality of ONUs 130 other than the one or more ONUs 130 as a target ONU 130, test whether the abnormal light emission is resolved by stopping transmission of the optical signal from each target ONU 130, and, if the abnormal light emission is resolved, specifies the target ONU 130 being tested as an ONU 130 that is a source of the abnormal light emission.

An OLT 110 includes an optical transmission/reception unit 111 to transmit and receive optical signals by time division; an abnormal-light-emission detection unit 112 to monitor the received optical signals, and detect a state in which the optical signals are being received for a predetermined period or longer as abnormal light emission in which the optical signals from one or more of the ONUs 130 are not received; an optical-communication control unit to sequentially select an ONU 130 one at a time from the plurality of ONUs 130 other than the one or more ONUs 130 as a target ONU 130, test whether the abnormal light emission is resolved by stopping transmission of the optical signal from each target ONU 130, and, if the abnormal light emission is resolved, specifies the target ONU 130 being tested as an ONU 130 that is a source of the abnormal light emission.

An optical transmitter based on optical time division multiplexing is disclosed, which may solve the issues of complex structure and operation of a multilevel-OTDM-based optical transmitter while using a multilevel signal modulation format and OTDM technology that may increase the transmission rate of an optical transmitter with limited bandwidth.

An optical transmitter based on optical time division multiplexing is disclosed, which may solve the issues of complex structure and operation of a multilevel-OTDM-based optical transmitter while using a multilevel signal modulation format and OTDM technology that may increase the transmission rate of an optical transmitter with limited bandwidth.

Disclosed herein are methods, devices, and systems for providing timing and bandwidth management of ultra-wideband, wireless data channels (including radio frequency and wireless optical data channels). According to one embodiment, a hub adapter includes a first high-speed computer peripheral interface, first digital circuitry coupled with the high-speed computer peripheral interface; and a first free-space-optical (FSO) transmitter coupled with the digital circuitry, and a first FSO receiver coupled with the digital circuitry. The first FSO transmitter is configured to transmit a data channel and an out-of-band control signal comprising timing information and bandwidth management information to a computer peripheral adapter and the data channel is configured to operate at a bit rate greater than 1 gigabits per second (Gbps).

Disclosed herein are methods, devices, and systems for providing timing and bandwidth management of ultra-wideband, wireless data channels (including radio frequency and wireless optical data channels). According to one embodiment, a hub adapter includes a first high-speed computer peripheral interface, first digital circuitry coupled with the high-speed computer peripheral interface; and a first free-space-optical (FSO) transmitter coupled with the digital circuitry, and a first FSO receiver coupled with the digital circuitry. The first FSO transmitter is configured to transmit a data channel and an out-of-band control signal comprising timing information and bandwidth management information to a computer peripheral adapter and the data channel is configured to operate at a bit rate greater than 1 gigabits per second (Gbps).

The present invention enables shortening the time required for resuming communication in a protection method that uses a backup path in an optical communication system that includes a master station device and multiple slave station devices. The slave station devices are connected to a loop path in parallel. The communication paths between the master station device and the slave station devices include a normal path and a backup path. The master station device executes communication control processing with respect to the slave station devices based on the RTTs. A first slave station device is one of the slave station devices, and a second slave station device is a slave station device that cannot perform communication via the normal path. If a second slave station device is detected, the master station device calculates a second backup path RTT for the second slave station device based on the first normal path RTT and the first backup path RTT for the first slave station device and a second normal path RTT for the second slave station device. The master station device then resumes communication control processing for the second slave station device based on the calculated second backup path RTT.

The present invention enables shortening the time required for resuming communication in a protection method that uses a backup path in an optical communication system that includes a master station device and multiple slave station devices. The slave station devices are connected to a loop path in parallel. The communication paths between the master station device and the slave station devices include a normal path and a backup path. The master station device executes communication control processing with respect to the slave station devices based on the RTTs. A first slave station device is one of the slave station devices, and a second slave station device is a slave station device that cannot perform communication via the normal path. If a second slave station device is detected, the master station device calculates a second backup path RTT for the second slave station device based on the first normal path RTT and the first backup path RTT for the first slave station device and a second normal path RTT for the second slave station device. The master station device then resumes communication control processing for the second slave station device based on the calculated second backup path RTT.

An optical buffer unit includes a plurality of delay line units each of which gives a delay to optical signals, and a switch that receives an optical signal output from one of the delay line units, includes a first output for outputting the optical signal to a next one of the delay line units and a second output for outputting the optical signal to another apparatus, and outputs the optical signal from the first output or the second output.