Impact of Fiber Nonlinearity on the Performance of Mode Division Multiplexing Systems
IRAQI JOURNAL OF COMPUTERS, COMMUNICATIONS, CONTROL AND SYSTEMS ENGINEERING,
2019, Volume 19, Issue 2, Pages 41-49
Abstract
in this paper, an analytical model is developed to estimate anonlinear phase noise (NPN) due to Kerr fiber nonlinearity and its interaction
with amplifier noise in mode division multiplexing (MDM) systems. Our
analysis uses generalized coupled multimode nonlinear Schrödinger equations
(MM- NLSE) that describe the propagation of the mode superimposing in the
optical fiber. The nonlinear phase noise versus channel power and transmission
distance is evaluated by implementing our analytical model for LP01, LP11a,
and LP11b spatial modes. Each mode carries a 4-QAM signal at a symbol rate
of 20 Gsymbol/s. The results reveal that LP11 mode has a lower phase noise
variance than LP01 mode over entire transmission distances. Finally, the error
vector magnitude (EVM) versus channel power is quantified using an analytical
model.
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