Parallel Transmission Frame Mapping for Optical Signal Adaptation
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Solution Overview
Problem
Current OTN systems face complexity in adapting to varying client signals and optical layer spectral bandwidths, leading to inefficient bandwidth usage and increased network complexity, particularly when dealing with multi-wavelength parallel interfaces.
Innovation Solution
A method and apparatus for transmitting and receiving client signals by mapping them into parallel transmission frames with fixed bit rates, adding management overhead, and modulating these frames onto optical carriers, which simplifies signal processing and adapts to changing bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the OTN system uses fixed line rates (2.5G, 10G, 40G, 100G) to adapt client signals, then the system maintains simplicity in signal adaptation, but it cannot efficiently utilize optical spectrum resources and adapt to varying bandwidth requirements
Solution Approach 1:
The patent introduces ODUflex (Optical Channel Data Unit-flex) which enables dynamic bandwidth allocation. The ODUflex structure allows the transport network to flexibly adjust the bandwidth of optical channels according to actual service requirements, transforming the fixed bandwidth system into a dynamic one. This resolves the contradiction by enabling bandwidth adaptation without requiring complete system redesign.
Solution Approach 2:
The patent changes the bandwidth parameter of OTN signals from fixed values (2.5G, 10G, 40G, 100G) to flexible values through ODUflex. By allowing the bandwidth parameter to vary continuously based on service needs, the system can efficiently utilize optical spectrum resources while maintaining manageable complexity through standardized flexibility mechanisms.
2Productivity
If multi-wavelength parallel interfaces are used for high-speed service access, then service capacity increases, but the processing complexity for adapting client signals into OTN parallel interfaces increases significantly
Solution Approach 1:
The patent segments high-speed client signals into multiple lower-rate channels that can be mapped into OTN parallel interfaces. By dividing the high-speed signal into manageable segments that fit within standard OTN channel capacities, the system can handle high-capacity services without requiring complex direct mapping mechanisms.
Solution Approach 2:
The patent introduces ODUflex as an intermediary layer between client signals and OTN parallel interfaces. This intermediary structure simplifies the adaptation process by providing a standardized interface that handles the complexity of mapping various client signal formats into OTN parallel structures, reducing overall system complexity.
3Productivity
If conventional multiplexing and distribution methods are used to adapt client signals, then signal transmission is achieved, but bandwidth utilization efficiency decreases
Solution Approach 1:
The patent implements dynamic bandwidth allocation through ODUflex, allowing the system to adjust bandwidth in real-time based on actual service requirements. This dynamic approach eliminates the waste associated with fixed bandwidth allocation, as bandwidth can be increased or decreased to match actual traffic patterns, thereby improving utilization efficiency while maintaining flexibility.
Data Source
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AI summary
Embodiments of the present invention provide a method and an apparatus for transmitting and receiving a client signal, and relate to the field of communications technologies. The method includes: mapping the client signal into channels of a parallel transmission frame, where the parallel transmission frame includes at least two channels; adding an overhead for the channels of the parallel transmission frame after the mapping, to form transmission channels of the parallel transmission frame, where bit rates of the transmission channels of the parallel transmission frame are fixed; and modulating the transmission channels of the parallel transmission frame onto one or more optical carriers in a same optical fiber, and transmitting the optical carrier after the modulation. According to the present invention, a structure of a parallel transmission frame is defined, a client signal, especially a multichannel client signal, is mapped into transmission channels of the parallel transmission frame, and the transmission channels are modulated onto one or more optical carriers in a same optical fiber, which greatly simplifies processing complexity for adapting a multichannel parallel client signal, circumvents an existing processing process of "multiplexing, distribution, and multiplexing", and simplifies a signal adaptation process.