<title>Coherent communication systems research and development at AT&amp;T Bell Laboratories, Solid State Technology Center</title>

Abstract

Research and development effort on a field deployable coherent lightwave system at AT&T Bell Laboratories is reviewed. Detailed features and design of a 1 .7 Gb/s FSK single filter heterodyne detection system and its performance in a one-month transmission field trial are described. Long distance transmission experiments of such a system with Er-doped fiber amplifiers at 1 .7 Gb/s and 2.5 Gb/s are presented.This paper reviews the progress of a field deployable coherent transmission system at AT&T Bell Laboratories, specifically the 1.7 Gb/s FSK single filter heterodyne detection * APT