title: Optimized digital backward propagation for phase modulated signals in mixed-optical fiber transmission link.
abstract: The parametric optimization of Digital Backward Propagation (DBP) algorithm for mitigating fiber transmission impairments is proposed and numerically demonstrated for phase modulated signals in mixed-optical fiber transmission link. The optimization of parameters i.e. dispersion (D) and non-linear coefficient (γ) offer improved eye-opening (EO). We investigate the optimization of iterative and non-iterative symmetric split-step Fourier method (S-SSFM) for solving the inverse non-linear Schrödinger equation (NLSE). Optimized DBP algorithm, with step-size equal to fiber module length i.e. one calculation step per fiber span for obtaining higher computational efficiency, is implemented at the receiver as a digital signal processing (DSP) module. The system performance is evaluated by EO-improvement for diverse in-line compensation schemes. Using computationally efficient non-iterative symmetric split-step Fourier method (NIS-SSFM) upto 3.6 dB referenced EO-improvement can be obtained at 6 dBm signal launch power by optimizing and modifying DBP algorithm parameters, based on the characterization of the individual fiber types, in mixed-optical fiber transmission link.
authors.affiliation: Chair for Microwave Engineering and High Frequency Technology, University of Erlangen-Nuremberg Cauerstrasse 9, D-91058 Erlangen, Germany. rameez@lhft.eei.uni-erlangen.de
authors.forename: Rameez
authors.initials: R
authors.lastname: Asif
authors.forename: Chien-Yu
authors.initials: CY
authors.lastname: Lin
authors.forename: M
authors.initials: M
authors.lastname: Holtmannspoetter
authors.forename: Bernhard
authors.initials: B
authors.lastname: Schmauss