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We propose a novel four-wave mixing (FWM) impairments compensation method based on cancellation by means of estimated FWM components. Digital coherent detection can compensate for fiber transmission degradation, including fiber nonlinearity impairments. However, in the backward propagation (BP) method, the out-of-band FWM components must be detected. With our proposed method, only the transmitted...
Two ASK-modulated optical signals are transmitted through dispersion-shifted fibers with an optical amplifier repeater. The transmitted signals are detected by heterodyne detection with phase-locked local oscillators. The detected individual signals are compensated by backward propagation method. The FWM-crosstalk ratio is improved from 12 dB to 17 dB and eye-diagrams are improved.
The compensation possibilities for inter-channel FWM impairments using digital coherent detection have been experimentally demonstrated. The signal-to-FWM crosstalk ratio after ASK transmission is increased from 16dB to more than 34dB and the eye diagram is also improved by the compensation.
FWM nonlinear impairment is compensated by heterodyne detection. Two optical signals are transmitted 20 km fiber at near zero dispersion. These signals and the generated FWM components are detected by heterodyne detection with one local oscillator. The detected signal is compensated by the backward propagation method.
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