Abstract
We characterize in-span signal power asymmetry in random distributed feedback ultralong Raman laser-amplified WDM transmission and numerically optimize fiber span length and operating band to achieve the lowest inter-span signal power asymmetry between transmitted and optically conjugated channels in systems relying upon mid-link optical conjugation to combat fiber nonlinear impairments.
Highlights
The nonlinear-Shannon limit sets a cap to the maximum capacity in single mode optical fibers [1, 2]
Several techniques have been proposed over the years to compensate or partially mitigate fiber nonlinear effects, such as pre-shaping and in-line nonlinearity management [3,4,5,6], dispersion engineered transmission systems with optical phase conjugation (OPC) [7, 8] or digital compensation through techniques such as back-propagation [6, 9, 10]
A simple approach to improve performance in mid-link OPC-assisted systems while retaining a periodic span structure lies in reducing signal power asymmetry within the periodic spans themselves, while ensuring a low impact of noise and non-deterministic nonlinear impairments in the overall transmission link
Summary
The nonlinear-Shannon limit sets a cap to the maximum capacity in single mode optical fibers [1, 2]. A simple approach to improve performance in mid-link OPC-assisted systems while retaining a periodic span structure lies in reducing signal power asymmetry within the periodic spans themselves, while ensuring a low impact of noise and non-deterministic nonlinear impairments in the overall transmission link. This approach assumes in-span signal evolution to be the same before and after conjugation, which will be valid only for small frequency shifts of the conjugated signal. We show the optimized single channel in-span signal power asymmetry variation due to wavelength dependent Raman gain and attenuation at different frequencies and span lengths
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