Optical Transmission Routing for Low-Latency Error Correction
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Solution Overview
Problem
In long-distance optical fiber transmission systems, the use of long correction codes for error correction increases computation load, leading to increased latency, which is undesirable for real-time services requiring low latency.
Innovation Solution
An optical transmission device that routes data to different channels based on latency requirements, using distinct error correction coding and modulation methods for each channel to optimize latency and transmission rate according to the destination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a long correction code is used for error correction in long-distance transmission, then error correction capability is improved, but computation amount increases and latency increases
Solution Approach 1:
The invention divides the transmission system into multiple transmission paths with different characteristics (e.g., different fiber routes, different wavelengths). By segmenting the data flow across these paths, the system can use shorter correction codes on low-latency paths while maintaining overall reliability through diversity of paths rather than relying on a single long correction code.
Solution Approach 2:
The invention applies different error correction strategies to different transmission paths based on their specific characteristics. Paths with lower error rates can use shorter correction codes, while paths with higher error rates use longer correction codes. This local optimization reduces overall computation load and latency while maintaining sufficient error correction capability where needed.
2Reliability
If a long correction code is used for error correction, then error tolerance is improved, but computation load increases
Solution Approach 1:
The invention segments the error correction function across multiple transmission paths, each using appropriately sized correction codes for their specific conditions. This distributes the computation load across parallel paths rather than concentrating it in a single heavy computation, reducing overall processing burden while maintaining error tolerance.
Solution Approach 2:
The invention changes the parameters of error correction (code length, code rate) based on transmission path characteristics. By adapting correction code parameters to match actual transmission conditions, the system achieves sufficient error tolerance with minimal computation load, avoiding the overhead of uniformly long correction codes across all paths.
Data Source
AI summary
An optical transmission device includes: a route control unit that outputs user data including destination information to a first channel or a second channel, based on a latency associated with each destination included in the destination information; a first optical transmission unit that treats the user data as first data when the user data are output to the first channel, converts the first data into a first optical signal by first error correction coding processing and a first modulation method, and transmits the first optical signal; and a second optical transmission unit that treats the user data as second data when the user data are output to the second channel, converts the second data into a second optical signal by second error correction coding processing different from the first error correction coding processing, and a second modulation method different from the first modulation method, and transmits the second optical signal.