**3. Low-complexity high-speed RS decoders for short-distance network**

For short-distance optical transmission, such as 10GBase-LR, since the noise rendered from transmission distance is quite limited, the requirement of coding gain is not as strict as longdistance backbone network (which will be discussed later). Therefore, as discussed in Section 1, Reed-Solomon (255, 239) code is widely used in this kind of network due to its high code rate and good error correction capability.

Although coding gain is not the major concern in this scenario, because of limited hardware resource, in order to implement efficient RS decoder, the designers have to consider the challenge of achieving high data rate with low hardware complexity. Accordingly, optimization of RS decoding architectures is necessary for high-efficiency hardware implementation.

In this section, based on the two main RS decoding algorithms, the improved ME-based and BM-based decoders are introduced.
