AN ANALYTICAL MODEL FOR ASSESSING THE DISTORTION OF CO-OFDM SIGNALS IN HEAVILY LOADED SINGLE-SPAN FIBER-OPTIC TRANSMISSION SYSTEMS
V. A. Vardanyan
Siberian State University of Telecommunications and Information Science, Novosibirsk, Russia
Keywords: fiber optic transmission systems, Data Center Interconnection (DCI), Coherent Orthogonal Frequency Division Multiplexing CO-OFDM, M-QAM, nonlinear phase noise, amplified spontaneous emission (ASE) noise, Q-factor, FEC
Abstract
Universal analytical expressions are proposed for calculating the quality factor (Q-factor) of optical amplitude-phase channel signals for data centerinterconnection (DCI) using Coherent Orthogonal Frequency Division Multiplexing (CO-OFDM). A single-span fiber-optic transmission system with an optical amplifier located at the receiving end and using polarization multiplexing for transmitting OFDM signals is considered. The resulting formulas take into account the simultaneous effects of nonlinear phase distortions occurring in the fiber and amplified spontaneous emission noise. These formulas enable the noise immunity of individual signal points in the M-QAM constellation to be estimated depending on the transmission system parameters, without resorting to resource-intensive simulation modeling. Calculations of the noise immunity of polarization-multiplexed 16-QAM channel signals showed the possibility of organizing a connection between Data Centers over a standard single-mode fiber over a distance of 80 km with a total data transfer rate of 32 Tbit/s.
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