Open AccessMultilevel Manchester (2 bits/symbol) coding with optical equaliser for increasing the transmission distance of high‐speed fibre optic links
Author(s) -
Oluwajobi Festus Idowu,
Nguyen Dong-Nhat,
Khan Nafizah,
Malekmohammadi Amin
Publication year - 2020
Publication title -
iet optoelectronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.379
H-Index - 42
eISSN - 1751-8776
pISSN - 1751-8768
DOI - 10.1049/iet-opt.2019.0130
Subject(s) - equaliser , bit error rate , transmission (telecommunications) , electronic engineering , single mode optical fiber , optical fiber , optical communication , dispersion (optics) , computer science , optics , telecommunications , engineering , physics , decoding methods
This study accessed the performance of the four‐level Manchester coding (4‐MC) and four‐level modified Manchester (4‐MM) technique at the bit rates of 20 and 40 Gb/s for the first‐order and second‐order optical equalisers. The performances were evaluated with respect to bit error rate (BER), power penalty, eye diagrams, and dispersion tolerance. Based on the results by utilising the second‐order optical equaliser, at 20 Gb/s, the transmission distance of 4‐MC and 4‐MM was extended by 25 and 27 km of standard single‐mode fibre (SSMF), respectively, while at the bit rate of 40 Gb/s, the 4‐MC and 4‐MM transmission distance was extended by 6.5 and 7.5 km of SSMF, respectively. Hence, the second‐order optical equaliser can adequately compensate for the fibre dispersion and consequently the overall BER performance. Therefore, the proposed system could serve as an alternative to the next‐generation high‐speed optical transmission links.