Title :
MCRB for Timing and Phase Offset for Low-Rate Optical Communication with Self-Phase Modulation
Author :
Sen, Deepak ; Wymeersch, Henk ; Irukulapati, Naga V. ; Agrell, Erik ; Johannisson, Pontus ; Karlsson, Magnus ; Andrekson, Peter A.
Author_Institution :
Dept. of Signals & Syst., Chalmers Univ. of Technol., Gothenburg, Sweden
Abstract :
We derive the modified Cramer-Rao bound (MCRB) for symbol timing and phase offset estimation in the presence of nonlinear self-phase modulation (SPM) in a dispersion compensated long-haul optical fiber link with coherent detection at data rates below 10 Gigabaud. In the presence of a low-pass filter at the receiver front-end, we find that SPM degrades the MCRB. Moreover, depending on the pulse shape, SPM induces underdamped oscillation on the bounds.
Keywords :
optical fibre communication; optical links; self-phase modulation; MCRB; SPM; coherent detection; data rates; low rate optical communication; low-pass filter; modified Cramer-Rao bound; phase offset estimation; pulse shape; self-phase modulation; symbol timing estimation; timing offset; underdamped oscillation; Dispersion; Estimation; Optical fiber communication; Phase estimation; Receivers; Timing; Vectors; Modified Cramer—Rao bound; self-phase modulation; timing and phase estimation;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2013.040913.122939
