SILVA, H. S.; http://lattes.cnpq.br/3672870581352292; SILVA, Hugerles Sales.
Resumo:
This dissertation presents a study on the application of low-density parity-check codes (LDPC)
to optical superchannels operating at very high transmission rates. In order to contextualize
the focus of the work, the first four chapters contain tutorial reviews about dense wavelength
division multiplexing (DWDM) optical networks, aspects of the physical layer for DWDM
networks, and LDPC. This class of codes, known to deliver excellent performance when applied
in a variety of communication channels, is based on sparse parity checking matrices. When
compared to other coding schemes, LDPC result in improved error correction capability along
with a less complex decoding algorithm. A Matlab code to evaluate the bit error rate (BER)
performance for optical superchannels has been developed. Results recently published have
been used to validate this code. A hypothetical 11 node optical network has been conceived to
serve as a virtual testbed for the Matlab code. Several BER versus bit energy per noise energy
curves have been obtained for specific optical transmission links. By applying LDPC, a coding
gain of 8 dB at BER = 10−15 has been achieved for one of the simulated links.