Animated CTA Banner
MapYourTech
MapYourTech has always been about YOUR tech journey, YOUR questions, YOUR thoughts, and most importantly, YOUR growth. It’s a space where we "Map YOUR Tech" experiences and empower YOUR ambitions.
To further enhance YOUR experience, we are working on delivering a professional, fully customized platform tailored to YOUR needs and expectations.
Thank you for the love and support over the years. It has always motivated us to write more, share practical industry insights, and bring content that empowers and inspires YOU to excel in YOUR career.
We truly believe in our tagline:
“Share, explore, and inspire with the tech inside YOU!”
Let us know what YOU would like to see next! Share YOUR thoughts and help us deliver content that matters most to YOU.
Share YOUR Feedback
Tag

FEC algorithms

Browsing
Items HD-FEC SD-FEC
Definition Decoding based on hard-bits(the output is quantized only to two levels) is called the “HD(hard-decision) decoding”, where each bit is considered definitely one or zero. Decoding based on soft-bits(the output is quantized to more than two levels) is called the “SD(soft-decision) decoding”, where not only one or zero decision but also confidence information for the decision are provided.
Application Generally for non-coherent detection optical systems, e.g.,  10 Gbit/s, 40 Gbit/s, also for some coherent detection optical systems with higher OSNR coherent detection optical systems, e.g.,  100 Gbit/s,400 Gbit/s.
Electronics Requirement ADC(Analogue-to-Digital Converter) is not necessary in the receiver. ADC is required in the receiver to provide soft information, e.g.,  coherent detection optical systems.
specification general FEC per [ITU-T G.975];super FEC per [ITU-T G.975.1]. vendor specific
typical scheme Concatenated RS/BCH LDPC(Low density parity check),TPC(Turbo product code)
complexity medium high
redundancy ratio generally 7% around 20%
NCG about 5.6 dB for general FEC;>8.0 dB for super FEC. >10.0 dB
 Example(If you asked your friend about traffic jam status on roads and he replies) maybe fully jammed or free  50-50  but I found othe way free or less traffic