Low complexity digital backpropagation for high baud subcarrier-multiplexing systems | Zendy

Fangyuan Zhang | Zendy; Qunbi Zhuge | Zendy; Meng Qiu | Zendy; David V. Plant | Zendy

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Low complexity digital backpropagation for high baud subcarrier-multiplexing systems

Author(s) -

Fangyuan Zhang,

Qunbi Zhuge,

Meng Qiu,

David V. Plant

Publication year - 2016

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.24.017027

Subject(s) - subcarrier multiplexing , subcarrier , computer science , multiplexing , electronic engineering , infinite impulse response , wavelength division multiplexing , bit error rate , orthogonal frequency division multiplexing , transmission (telecommunications) , frequency division multiplexing , quadrature amplitude modulation , channel (broadcasting) , telecommunications , optics , digital filter , bandwidth (computing) , physics , wavelength , engineering

In this paper, we propose two modifications to reduce the complexity of the subcarrier-multiplexing (SCM) based digital backpropagation (DBP) for high symbol rate SCM systems. The first one is to reduce the number of interfering subcarriers (RS-SCM-DBP) when evaluating the cross-subcarrier nonlinearity (CSN). The second one is to replace the original frequency domain CSN filters with the infinite impulse response (IIR) filters (IIR-RS-SCM-DBP) in the CSN compensation. The performance of the proposed schemes are numerically evaluated in three-channel dual-polarization (DP) 16QAM wavelength-division multiplexing (WDM) transmissions. The aggregate symbol rate for each channel is 120 GBaud and the transmission distance is 1600 km. For the SCM system with 16 subcarriers, the IIR-RS-SCM-DBP with only 4 interfering subcarriers and 2 steps can achieve a 0.3 dB Q-factor improvement in the WDM transmission. Compared to the original SCM-DBP, the proposed IIR-RS-SCM-DBP reduces the complexity by 48% at a performance loss of only 0.07 dB.

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