FlexO Frame Multiplexing for 200G Optical Transmission
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Solution Overview
Problem
Current optical transport networks (OTNs) with fixed-rate interfaces cannot meet the increasing and diversifying service traffic requirements, limiting interconnection capabilities and preventing the use of higher-rate optical transceiver modules such as 200 G or 400 G optical modules.
Innovation Solution
The proposed solution involves mapping n 100 G OTU signals to n 100 G FlexO instance frames, performing multiplexing on these frames in groups to generate higher-rate FlexO frames, and then applying scrambling and forward error correction (FEC) coding to enable transmission using high-rate optical modules like 200 G or 400 G optical modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If n 100 G OTU signals are mapped to n 100 G FlexO instance frames and transmitted using standard 100 G optical modules, then the transmission is compatible with existing infrastructure, but the network capacity and transmission rate are limited and cannot utilize higher-rate optical modules
Solution Approach 1:
The patent combines multiple 100 G FlexO instance frames into a single multiplexed frame structure. Specifically, it maps n 100 G OTU signals to n FlexO instance frames, then multiplexes these frames by interleaving their payloads to form a unified higher-rate frame that can be transmitted using 200 G or 400 G optical modules, thereby merging multiple lower-rate channels into a higher-capacity transmission medium
Solution Approach 2:
The patent transitions from a single 100 G transmission dimension to multiple parallel dimensions by creating a multiplexed frame structure that accommodates multiple FlexO instance frames. This dimensional expansion allows the system to utilize the bandwidth capacity of higher-rate optical modules (200 G, 400 G) while maintaining compatibility with existing 100 G signal structures through the interleaved frame organization
2Productivity
If multiple 100 G optical modules are used to achieve higher transmission capacity, then the network capacity increases, but the device complexity and cost increase due to requiring multiple separate optical modules
Solution Approach 1:
The patent merges multiple 100 G optical module functions into a single higher-rate optical module by creating a multiplexed frame structure. Instead of requiring n separate 100 G optical modules to transmit n 100 G OTU signals, the system multiplexes these signals into a unified frame that can be transmitted through one 200 G or 400 G optical module, thereby reducing the number of physical devices while maintaining or increasing total capacity
Solution Approach 2:
The multiplexed FlexO frame structure serves multiple functions simultaneously: it carries multiple 100 G OTU signals, maintains FlexO protocol compatibility, and enables transmission over higher-rate optical interfaces. This universal frame structure allows a single optical module to perform what would otherwise require multiple specialized modules, reducing system complexity
3Reliability
If n FlexO frames are used corresponding to n 100 G optical modules, then each signal can be transmitted independently, but the system cannot utilize higher-rate optical transceiver modules like 200 G or 400 G modules
Solution Approach 1:
The patent segments the higher-rate transmission into multiple interleaved FlexO instance frames within a single multiplexed structure. Each 100 G OTU signal is assigned to a specific FlexO instance frame, maintaining independent signal paths and reliability characteristics, while the overall multiplexed frame enables compatibility with higher-rate optical modules through the interleaved organization of these segmented components
Data Source
AI summary
A first optical network device groups a plurality of FlexO instance frames into one group, where each of the plurality of FlexO instance frames carries one OTU signal; then, performs multiplexing on the plurality of FlexO instance frames grouped into one group, to generate one first FlexO frame; next, performing scrambling and FEC processing on the first FlexO frame to generate one second FlexO frame and send it to a second optical network device. If a rate of the FlexO instance frame is 100 Gbps and two FlexO instance frames are grouped into one group, the 200 G optical module can be used in the transmission method.