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

Jian Zhao | Zendy; LianKuan Chen | Zendy

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

Author(s) -

Jian Zhao,

LianKuan Chen

Publication year - 2017

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.25.009368

Subject(s) - quadrature amplitude modulation , orthogonal frequency division multiplexing , qam , optics , computer science , modulation (music) , bit error rate , intensity modulation , gigabit , symbol rate , constellation diagram , electronic engineering , physics , algorithm , telecommunications , phase modulation , decoding methods , phase noise , engineering , channel (broadcasting) , acoustics

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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