Adaptively loaded IM/DD optical OFDM based on set-partitioned QAM formats

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Adaptively loaded IM/DD optical OFDM based on set-partitioned QAM formats

Zhao, Jian; Chen, Lian-Kuan
Date: 2017-04-17
Copyright: © 2017 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Related: http://www.opticsexpress.org/abstract.cfm?URI=oe-25-8-9368
Citation: Zhao, J. and Chen, L.-K. (2017) 'Adaptively loaded IM/DD optical OFDM based on set-partitioned QAM formats', Optics Express, 25(8), pp. 9368-9377. doi:10.1364/OE.25.009368
Published Version: 10.1364/OE.25.009368

Abstract:

We investigate the constellation design and symbol error rate (SER) of set-partitioned (SP) quadrature amplitude modulation (QAM) formats. Based on the SER analysis, we derive the adaptive bit and power loading algorithm for SP QAM based intensity-modulation direct-detection (IM/DD) orthogonal frequency division multiplexing (OFDM). We experimentally show that the proposed system significantly outperforms the conventional adaptively-loaded IM/DD OFDM and can increase the data rate from 36 Gbit/s to 42 Gbit/s in the presence of severe dispersion-induced spectral nulls after 40-km single-mode fiber. It is also shown that the adaptive algorithm greatly enhances the tolerance to fiber nonlinearity and allows for more power budget.

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