Wide-range and fast-tracking frequency offset estimator for optical coherent receivers

Abstract

A blind spectrum-based frequency offset estimator with fast tracking time is presented. A receiver using the proposed estimator to eliminate the frequency ambiguity of the m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> power algorithm can achieve precise estimation over a wide frequency range.