Single-Mode Fibers with Reduced Single-Coating Diameters

We theoretically and experimentally compare the optical and mechanical properties of reduced coating diameter Single-Mode Fibers (SMFs) with either dual-coating or single-coating systems and standard 125μm cladding diameter. A G.657.A2 trench-assisted step-index SMF with a colored single coating of 170μm diameter and Young's modulus of 900MPa is fabricated. The micro-bend-losses are higher than those of a 165μm dual-coating diameter fiber but still at acceptable levels for most cable and connectivity applications, and the tensile strength, coating strip force, and proof-test break rate are improved. Such a single-coating approach can lead to 150μm coating diameter SMFs that meet the optical and mechanical requirements of the industry, when the dual-coating approach reaches its limits.