Adaptively loaded IM/DD optical OFDM based on set-partitioned QAM formats
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.
Fiber optics communications , Modulation
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
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