Abstract
We study unrepeatered transmission of 40x256 Gb/s systems with polarization-multiplexed 16-quadrature amplitude modulation (PM-16QAM) channels using simple coherent optical system configurations. Three systems are investigated with either a homogeneous fiber span, or simple two-segment hybrid fiber designs. Each system relies primarily on ultra-low loss, very large effective area fiber, while making use of only first-order backward pumped Raman amplification and no remote optically pumped amplifier (ROPA). For the longest span studied, we demonstrate unrepeatered 256 Gb/s transmission over 304 km with the additional aid of nonlinear compensation using digital backpropagation. We find an average performance improvement in terms of the Q-factor of 0.45 dB by using digital backpropagation compared to the case of using chromatic dispersion compensation alone for an unrepeatered span system.
Highlights
Long point-to-point unrepeatered spans of several hundred kilometers are found in submarine and terrestrial networks connecting islands, mainland points in a festoon configuration, or cities with desert or otherwise forbidding landscape between them
We investigate 40x256 Gb/s transmission of PM-16QAM signals over unrepeatered spans with minimal complexity comprised solely or primarily of an ultra-low loss, very large effective area fiber
We have demonstrated 40x256 Gb/s PM-16QAM transmission over unrepeatered spans of length 286 km, 292 km, and 304 km
Summary
Long point-to-point unrepeatered spans of several hundred kilometers are found in submarine and terrestrial networks connecting islands, mainland points in a festoon configuration, or cities with desert or otherwise forbidding landscape between them. In these systems, the primary objective is to achieve a single-span system between the points of interest with no active equipment between terminals. To the authors’ knowledge, this is the longest unrepeatered span transmission demonstrated for 200 Gb/s data rate, PM-16QAM signals using a simple first-order backward pumped Raman amplification scheme
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
