Abstract
The effect of intra-channel four-wave mixing on the performance of a 160 Gb/s OTDM RZ 100 km transmission system is analyzed. Strong dispersion management to suppress the detrimental effects of intra-channel four-wave mixing is presented theoretically and verified experimentally. Results demonstrate that amplitude fluctuation and ghost pulses are well suppressed by strong dispersion management. Stable (>2 h) error-free (10−12) transmission over 100 km is achieved without forward-error correction, and the power penalty is ∼3.6 dB.
Highlights
The effect of intra-channel four-wave mixing on the performance of a 160 Gb/s Optical time-division multiplexing (OTDM) RZ 100 km transmission system is analyzed
In a dispersion-managed system, expansion of the transmissible distance is limited by intra-channel nonlinear interactions, which consist of intra-channel cross-phase modulation (IXPM) and intra-channel four-wave mixing (IFWM) [3,4]
IXPM shifts the mean frequency and leads to timing jitter, whereas IFWM brings about amplitude fluctuation via energy transfer and generation of ghost pulses in the zero bit slots, resulting in severe limitations to bandwidth efficiency
Summary
Optical pulse propagation in a strongly dispersion-managed system can be described by i ∂q + d (Z ) ∂2q + S (Z ) q 2 q = 0,. When the amplitude of the ghost pulse is small, the IFWM process can be described as [10]. Substituting eq (2) for qm, qn and qm+n, m,n the ghost pulse in the spectral domain is given by [10]. The growth rate of the ghost pulse is determined by the perturbation term R(Z,ω). The pulse spreads widely and has a large chirp. Where R(Z, 0) is inversely proportional to Cτ in eq (7), and the IFWM is effectively reduced using of narrower input pulse with wider spectral width and designing a dispersion management line with large accumulated dispersion [9,10]
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