A service mapping processing method for an optical transport network, an apparatus, and a system are provided, where the method includes: generating mapping adaptation indication information according to a mapping granularity of a to-be-carried LO ODU, where the mapping granularity is M×g bytes, M is a quantity of timeslots occupied by the to-be-carried LO ODU in an OPUCn, g is a size of a mapping granularity corresponding to each timeslot of the timeslots occupied by the LO ODU, and g is a positive integer greater than 1; mapping, according to the mapping adaptation indication information, the to-be-carried LO ODU to an ODTUCn.M payload area; encapsulating the mapping adaptation indication information into the ODTUCn.M overhead area; encapsulating the ODTUCn.M into an OTUCn; and sending the OTUCn to a receive end device. The method avoids that OTUCns that use different mapping granularities cannot interwork between a receive end and a transmit end.

Embodiments of the present disclosure provides a method for service processing in optical transport network including: mapping a client service into a service container; and mapping the service container into a data frame, wherein the data frame includes multiple unit blocks for bearing the service container, the unit blocks are divided into first-type unit blocks and second-type unit blocks, the first-type unit blocks include a payload portion, and the second-type unit blocks include a payload portion and an overhead portion, the payload portion is used for bearing service data, and the overhead portion includes identification information of the service container. The embodiments of the present disclosure also provide an apparatus for service processing in optical transport network, an electronic device, and a computer readable medium.

Example embodiments of this application provide a method and an apparatus for transmitting a service flow based on FlexE. The method includes: sending, by a first network device, a first FlexE overhead frame to a second network device, where the first network device and the second network device transmit a service flow using a first FlexE group, and the first FlexE overhead frame includes FlexE group adjustment identification information and PHY information of a physical layer (PHY) included in a second FlexE group; receiving, by the first network device, a second FlexE overhead frame sent by the second network device, where the second FlexE overhead frame includes FlexE group adjustment acknowledgment identification information; adjusting, by the first network device, the first FlexE group to the second FlexE group; and sending, by the first network device, the service flow to the second network device based on the second FlexE group, to dynamically adjust a FlexE group.

An optical signal transmission method includes mapping a first optical data unit frame to a first flexible tributary unit frame, where the first flexible tributary unit frame includes a plurality of payload blocks; mapping the first flexible tributary unit frame to a first optical payload unit frame, where the plurality of payload blocks are distributed in a payload area of the first optical payload unit frame; mapping the first optical payload unit frame to a second optical data unit frame, where a bit rate of the second optical data unit frame is greater than a bit rate of the first optical data unit frame; mapping the second optical data unit frame to a first optical transport unit frame; and sending the first optical transport unit frame.

A service processing method in an optical transport network (OTN), including: mapping a client service to a service container; mapping the service container to an OTN frame or an OTN multi-frame composed of a plurality of continuous OTN frames, where a payload area of the OTN frame or the OTN multi-frame includes M unit blocks configured to bear the service container; bearing length indication information of the unit blocks in an overhead area of the OTN frame or the OTN multi-frame; and sending the OTN frame or the OTN multi-frame. Embodiments of the present disclosure further provide a service processing apparatus in an OTN, an electronic device, and a computer-readable medium.

Embodiments of the present disclosure provides a method for service processing in an optical transport network including: mapping a client service into a service container; and mapping the service container into an optical transport network frame, where a payload area of the optical transport network frame consists of payload blocks, each of the payload blocks includes an overhead area, and the overhead area includes an indicator being used for indicating whether data carried by the payload block is service container data or stuff data. The embodiments of the present disclosure further provide an apparatus for service processing in an optical transport network, an electronic device and a computer readable medium.

Various examples relate to a concept for generating and using a preamble for transmissions in a point-to-multipoint network, such as a Passive Optical Network (PON). A preamble generation apparatus for generating a preamble for a communication over an optical network comprises circuitry that is configured to generate a first subsection of the preamble, the first subsection of the preamble comprising a repetitive signal pattern. The preamble generation apparatus is configured to generate a second subsection of the preamble subsequent to the first subsection, the second subsection comprising a pseudorandom signal sequence.

A framer in a transmission device that allocates time slots of an optical channel to a logical path, divides client signals received via the logical path to the time slots allocated to the logical path, and transmits the client signals by a plurality of optical suhcarriers using optical wavelengths correlated with the time slots includes: a time slot allocating unit configured to perform a process of reducing a transmission band of the logical path when some of the optical wavelengths are unavailable and changing the time slots allocated to the logical path depending on the reduced transmission band to avoid using the time slots corresponding to the unavailable optical wavelengths.

An optical module is disclosed. According to one implementation, the optical module comprises an optical receiver, a diode, a first resistor, a first capacitor, a comparator, and a control chip. The diode anode connects electrically with a triggering signal output end of the optical receiving module, the cathode of the diode connects with one end of the first capacitor and one input end of the comparator. Another end of the first capacitor connects with the ground; the first resistor is connected in parallel with both ends of the first capacitor. A pre-set reference voltage is connected with another input end of the comparator. The optical receiver generates a first triggering signal in response to a burst mode optical signal. After inputting the first triggering signal into the diode anode, the comparator outputs a second triggering signal from the output end, triggering the control chip to generate a reset signal input into the optical receiver.

Disclosed are a method and device for managing optical channel overhead, and an optical signal receiving node. The method comprises: optical channel overhead information is structured, wherein the optical channel overhead information comprises at least one of the following: the optical channel nominal central frequency, the optical channel application code, and the optical channel trail trace identifier; and the optical channel overhead information is sent to the optical signal receiving node. The disclosure solves the technical problem in the related art of an inability to negotiate a single, unified optical channel nominal central frequency and application code between the optical transmitter and the optical receiver, i.e. the disclosure enables an optical transmitter and the optical receiver to negotiate such the nominal central frequency and application code, thereby achieving the technical result of an optical signal being correctly sent and received.