title: Comparison of DSP-based nonlinear equalizers for intra-channel nonlinearity compensation in coherent optical OFDM.
abstract: A novel versatile digital signal processing (DSP)-based equalizer using support vector machine regression (SVR) is proposed for 16-quadrature amplitude modulated (16-QAM) coherent optical orthogonal frequency-division multiplexing (CO-OFDM) and experimentally compared to traditional DSP-based deterministic fiber-induced nonlinearity equalizers (NLEs), namely the full-field digital back-propagation (DBP) and the inverse Volterra series transfer function-based NLE (V-NLE). For a 40 Gb/s 16-QAM CO-OFDM at 2000 km, SVR-NLE extends the optimum launched optical power (LOP) by 4 dB compared to V-NLE by means of reduction of fiber nonlinearity. In comparison to full-field DBP at a LOP of 6 dBm, SVR-NLE outperforms by ∼1  dB in Q-factor. In addition, SVR-NLE is the most computational efficient DSP-NLE.
authors.forename: Elias
authors.initials: E
authors.lastname: Giacoumidis
authors.forename: Sofien
authors.initials: S
authors.lastname: Mhatli
authors.forename: Tu
authors.initials: T
authors.lastname: Nguyen
authors.forename: Son T
authors.initials: ST
authors.lastname: Le
authors.forename: Ivan
authors.initials: I
authors.lastname: Aldaya
authors.forename: Mary E
authors.initials: ME
authors.lastname: McCarthy
authors.forename: Andrew D
authors.initials: AD
authors.lastname: Ellis
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton