New Encoding Method Helps Increase Transmission Distances in 100G Fiber Optics

FEC or “Forward Error Correction” is an advanced ECC encoding method used in optical networking. Conceptually similar to the ECC example above, it offers increased efficiency and the ability to correct errors without requiring retransmission.

All ECC methods trade some amount of throughput for the ability to detect and correct errors in transmission. There are many FEC algorithms in use today but the most common is known as Reed-Solomon FEC. Reed-Solomon adds about 7% overhead while providing the equivalent of 6 dB gain in signal to noise ratio resulting in about four times the signal strength. This increased signal strength can dramatically increase the possible transmission distances.

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