Impact of InterChannel Interference in gridless nyquist-wdm systems with and without nonlinear impairments compensation
Resumen
En este artículo, se presenta una caracterización sistemática de los efectos de la interferencia intercanal (ICI) en sistemas Nyquist-wdm debido a dos contribuciones: i) traslape espectral de las portadoras y ii) estimulación de los efectos no lineales de la fibra óptica. La ICI se evalúa en términos de la tasa de error de bit (BER) a 16 Gbaudios y 32 Gbaudios, como función de la potencia de diversos parámetros del sistema. Se implementa en el DSP del receptor coherente un ecualizador no lineal basado en el algoritmo backpropagation, para compensar los Efectos no lineales en la señal recibida. Los resultados demostraron que la ici debido a los canales traslapados tiene mayor impacto en la BER que la ICI debido a las no linealidades de la fibra óptica sin traslape. Además, el ecualizador no lineal mejora el desempeño del sistema al reducir la BER hasta 3 y 0.7 órdenes de magnitud para QPSK y 16QAM, respectivamente. Esto significa que el algoritmo backpropagation puede minimizar efectos no lineales de la ICI bajo variaciones en los parámetros del sistema, pero su desempeño se limita en escenarios con espaciamiento espectral sub-Nyquist.
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