Overcoming Kerr-induced capacity limit in optical fiber transmission

Abstract

Nonlinear optical response of silica imposes a fundamental limit on the information transfer capacity in optical fibers. Communication beyond this limit requires higher signal power and suppression of nonlinear distortions to prevent irreversible information loss. The nonlinear interaction in silica is a deterministic phenomenon that can, in principle, be completely reversed. However, attempts to remove the effects of nonlinear propagation have led to only modest improvements, and the precise physical mechanism preventing nonlinear cancellation remains unknown. We demonstrate that optical carrier stability plays a critical role in canceling Kerr-induced distortions and that nonlinear wave interaction in silica can be substantially reverted if optical carriers possess a sufficient degree of mutual coherence. These measurements indicate that fiber information capacity can be notably increased over previous estimates.

Microresonator-based solitons for massively parallel coherent optical communications

“…Unlike carriers derived from a bank of individual laser modules, the tones of a comb are intrinsically equidistant in frequency, thereby eliminating the need for individual wavelength control and for inter-channel guard bands [8,12]. In addition, when derived from the same comb source, stochastic frequency variations of optical carriers are strongly correlated, permitting efficient compensation of impairments caused by nonlinearities of the transmission fiber [13]. For application in optical communications, frequency comb sources must be compact.…”

Implementation of Memory Polynomial Based Adaptive Digital Post distortion for Coherent Optical System

“…Higher optical signal to noise ratio (OSNR) is required with advanced modulation formats for long haul transmission system for achieving given bit error rate(BER)which requires more signal launch power in the fiber but increased launch power degrades signal quality due to kerr nonlinear effects that limits the achievable transmission distance in single channel and WDM systems [1][2][3][4][5][6][7][8].As compensation of linear effects is possible , research is boosted for compensation of nonlinear impairments which limit the transmission performance of the system. Number of techniques in optical domain and digital domain are proposed for compensation of fiber nonlinear impairments.…”

Perturbative discrete-time multivariate fiber channel model with finite memory

“…More accurate channel capacity estimations will require accurate modelling approaches that take into account the finite response of the nonlinear channel [7][8]. These can be also used for other applications such as coding [6] or pre/post-distortion [9][10] compensation, and suggest system designs that can improve significantly the transmission capacity [11][12].…”