Journal
OPTICS COMMUNICATIONS
Volume 381, Issue -, Pages 200-204Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2016.06.087
Keywords
Intensity modulation; Direct detection; PAM-4
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Funding
- China National Science Foundation Project [61505154]
- National Science Foundation of China [61201086]
- China Scholarship Council [201506375060]
- Planned Science and Technology Project of Guangdong Province [2013B090500007]
- Dongguan Project on the Integration of Industry, Education and Research [2014509102205]
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In this paper, a transmission of 112(4 x 28)-Gb/s PAM-4 signal is experimentally demonstrated within only 50-GHz grid, achieving an optical spectral efficiency (SE) of 2.24 b/s/Hz. For the intensity modulation and direct detection (IM/DD) based PAM-4 transmission, it is the first time to the best of our knowledge that 112-Gb/s PAM-4 signal has been transmitted over 48.6-km standard single mode fiber (SSMF), which is compatible with 50-GHz standard gridding. By employing digital pre-equalization, duobinary encoding/decoding and 7-level based training sequence aided least-mean square (TS-LMS) algorithm, each lane of the 28-Gb/s PAM-4 signal occupies less than 11-GHz optical spectral (3-dB bandwidth), resulting in negligible inter-channel interference for the 4-lane 112-Gb/s PAM-4 signals within 50-GHz grid. The proposed method is bandwidth and computationally efficient, Which is thought feasible in the low-cost short reach optical networks. (C) 2016 Elsevier B.V. All rights reserved.
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