研究目的
To propose an application layer adaptive forward error correction (AL-AFEC) coding scheme for COTS optical transceivers in optical interconnect to enable longer transmission distance and cope with individual differences due to manufacturing variations.
研究成果
The AL-AFEC coding scheme effectively enables longer transmission distances (up to 600 m error-free) and mitigates PER fluctuations caused by manufacturing variations in COTS optical transceivers. It is a low-cost solution as it requires no additional hardware, making it suitable for existing and future data centers.
研究不足
The scheme may not handle extremely high PER scenarios (e.g., near 100% error rate at 700 m for some modules). The adaptive parameters (β and γ) are empirical and may require optimization for different link conditions. The study is limited to 10 Gbps Ethernet links and specific SFP+ modules.
1：Experimental Design and Method Selection:
The study designed an experimental system to test the AL-AFEC coding scheme in a 10 Gbps Ethernet link over OM4 multimode fiber using COTS 10GBASE-SR SFP+ modules. The scheme employs raptor codes for adaptive error correction based on packet error rate (PER) fluctuations.
2：Sample Selection and Data Sources:
Two pairs of SFP+ modules (Pair A and Pair B) of the same type were used to study individual differences. Pseudo-random binary sequence (PRBS) data was transmitted and divided into blocks for encoding.
3：List of Experimental Equipment and Materials:
Equipment includes COTS 10GBASE-SR SFP+ modules, OM4 MMF (ranging from 200 to 700 m), an optical attenuator, and servers for transmission and reception.
4：Experimental Procedures and Operational Workflow:
Data is encoded using the AL-AFEC encoder, transmitted through the optical link, and decoded at the receiver. Redundancy and step size are adjusted based on PER measurements. Channel loss is calculated and varied using the attenuator.
5：Data Analysis Methods:
PER is measured and used to calculate reception overhead ε. Performance is evaluated for different block sizes (k=256 or 1024) and packet lengths (L=1500 bytes). Statistical analysis of PER and redundancy adjustments is conducted.
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