Coherent systems based on QPSK rely on differential encoding to avoid catastrophic error propagation. A simple solution for soft differential decoding is presented that limits the penalty after FEC to 0.75dB, similar to pre-FEC binary differential decoding.
|Title of host publication||Proceedings of the 36th European Conference and Exhibition on Optical Communication, ECOC 2010, September 19-23, 2010, Torino, Italy|
|Place of Publication||Piscataway|
|Publisher||Institute of Electrical and Electronics Engineers|
|Publication status||Published - 2010|