OTUCnAG Frame Byte-Interleaving Mapping for Flexible Grid Spectrum
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Solution Overview
Problem
The existing optical transport technologies face challenges in achieving high spectrum efficiency and flexibility, particularly beyond 100 Gbit/s, due to limitations in wavelength division multiplexing with fixed grids, which restricts the ability to effectively map and multiplex data in high-rate optical transport systems.
Innovation Solution
The method involves dividing an Optical Transmit Unit Administrative Group (OTUCnAG) frame into multiple Optical Transport Unit Transport Group Frames (OTUCmTGs) in a byte-interleaving way and mapping each OTUCmTG into a corresponding Optical Channel (OCh) for transmission, allowing data to be carried on continuous frequency slots, thereby enhancing spectrum utilization and system flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional wavelength division multiplexing with fixed grid is used, then system stability and ease of operation are maintained, but spectrum efficiency and adaptability deteriorate when implementing beyond 100 G transport
Solution Approach 1:
The patent segments the high-rate data stream (e.g., 400G) into multiple lower-rate sub-streams (e.g., four 100G streams). Each sub-stream is independently mapped to a separate optical channel with its own overhead bytes, allowing flexible grid allocation while maintaining compatibility with existing 100G system components and protocols.
Solution Approach 2:
The patent implements a nested structure where multiple OTUCm frames (each carrying 100G data) are nested within a single OTUCnAG frame (carrying 400G data). The outer frame provides overall synchronization and management, while inner frames carry individual channel data, enabling hierarchical control and flexible decomposition of high-rate transport into manageable units.
2Productivity
If high-rate Ethernet interface transport is implemented, then bandwidth demand is met, but spectrum efficiency limit becomes a constraint
Solution Approach 1:
The patent enables dynamic allocation of spectrum resources by allowing each OTUCm sub-frame to be independently mapped to optical channels with flexible bandwidth assignments. The system can dynamically adjust the number of frequency slots allocated to each channel based on actual traffic demands, achieving optimal spectrum efficiency for varying bandwidth requirements.
Solution Approach 2:
The patent changes the spectral parameters by introducing flexible grid spacing instead of fixed 50GHz channels. Each optical channel can be assigned a customized bandwidth (e.g., 37.5GHz, 50GHz, 62.5GHz) based on the modulation format and data rate requirements, allowing the system to adapt spectral parameters to match actual transport needs and improve overall spectrum efficiency.
3Adaptability or versatility
If flexible grid technology is introduced to improve spectrum efficiency, then adaptability increases, but data mapping and multiplexing complexity increases
Solution Approach 1:
The patent segments the complex mapping problem into manageable parts by dividing the 400G data stream into multiple 100G sub-streams. Each sub-stream follows a standardized mapping procedure defined in existing protocols, reducing the overall complexity compared to creating entirely new mapping rules for 400G while still achieving flexible grid allocation.
Solution Approach 2:
The patent creates a universal mapping framework where the same OTUCm frame structure and mapping procedures can be used across different data rates (100G, 200G, 400G) by simply changing the number of concatenated frames. This multi-functional approach reduces complexity by reusing existing protocols and structures rather than developing separate solutions for each rate.
4Adaptability or versatility
If byte-interleaving division is applied to OTUCnAG frame, then spectrum utilization improves, but processing complexity increases
Solution Approach 1:
The patent segments the OTUCnAG frame into multiple OTUCm sub-frames using byte-interleaved division, where bytes from different source channels are interleaved into destination frames. This segmentation allows each sub-frame to be independently processed and mapped to flexible grid channels, improving spectrum utilization while maintaining manageable processing complexity through modular architecture.
Data Source
AI summary
Provided are a method and device for mapping and demapping of data. The method comprises: an OTUCnAG comprising an ODUCn with a rate of n*100 gigabits per second to which is added an OTU overhead, is divided according to a byte-interleaving scheme into multiple OTUCmTG; the OTUCmTG respectively are each mapped to a corresponding OCh, and data in the OCh is born on continuous frequency slots for transmission, wherein the rate of the OTUCnAG is n*100 gigabits per second, the rate of the OTUCmTG is m*100 gigabits per second, both m and n are positive integers, and m less than or equal to n. The disclosure increases optical fibre spectrum utilization efficiency and system flexibility and compatibility.