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What Is the FEC Forward Error Correction Function of Optical Module?


Forward Error Correction (FEC) can improve the performance of error correction by encoding data with certain format before transmitting it through a channel, along with redundant bits containing signal features. At the receiving end, the data is decoded using a specified algorithm, and the receiver verifies the transmission for errors. If errors exist, the sender is notified to retransmit. FEC allows for encoding data with low bit error rates into a stream of error-free data, achieving the goal of identifying and correcting error codes.

FEC, or Forward Error Correction, is a function that improves error correction performance.

As a 100g qsfp28 supplier, we remind you that currently, optical modules are developing towards high speed and long distance transmission. However, as transmission rates increase, different factors can limit transmission distance, such as chromatic dispersion, non-linear effects, and polarization mode dispersion. Moreover, ideal digital channels do not exist in practical transmission, and transmission can cause distortion and non-uniform delay, leading to errors and jitter. FEC encoding and decoding technology can improve error correction performance by encoding data with a certain format before transmitting it, with redundant bits containing signal features, and decoding it at the receiving end with a specified algorithm. The receiver verifies transmission errors and notifies the sender for retransmission, allowing for encoding low bit error rates into a stream of error-free data, achieving the goal of identifying and correcting error codes. And 100g optical modules are popular in this industry.

FEC is applicable for high-speed communication (25G, 40G, and 100G, especially 100G optical modules). While FEC has advantages in error correction and increasing transmission distance, correcting errors can cause a delay in some packets. Therefore, not all high-speed optical modules are advised to enable this function. And 400g transceiver market cannot be ignored. For example, it is not advisable to enable FEC function when using 100G LR4 optical modules. 100G optical modules rely mainly on the device-side configuration of FEC for error correction. Therefore, switch support for FEC function is required, and in most cases, switches that support FEC function enable FEC function by default. Furthermore, it is important to note that if the FEC function is enabled on the A-side optical module, then the B-side optical module must also enable the function; otherwise, the interface will not come up.

Thus, the FEC function in optical module transmission systems can greatly improve communication effectiveness and reliability.

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