Principles of Optical Fiber Measurements

Preface1. A Preliminary Overview 1.1 Background 1.2 The Structures of Fibers 1.3 Single-Mode and Multimode Fibers 1.4 Graded-Index Fibers 1.5 Fiber Loss 1.6 Dispersion in Multimode Fibers 1.7 Dispersion in Single-Mode Fibers References2. Fundamentals 2.1 Ray Optics 2.2 The WKB Method 2.3 Weakly Guided Modes 2.4 Loss Mechanisms 2.5 Dispersion References3. The Transverse Backscattering Method 3.1 Refractive Index of Bare and Step-Index Fibers 3.2 Measurement of Outer Fiber Diameter 3.3 Measurement of Elliptical Deformation 3.4 Measurement of Jacket Eccentricity References4. Refractive Index Profiling Methods 4.1 The Reflection Method 4.2 The Near-Field Method 4.3 The Refraction Method 4.4 Interferometric Slab Method 4.5 The Transverse Interferometric Method (TIM) 4.6 The Refraction Angle Method 4.7 The Focusing Method 4.8 Generalization to Elliptical Cores References5. Loss Measurements 5.1 Launching Light into Fibers 5.2 The Calorimetric Method 5.3 Scattering Loss Measurements 5.4 The Cut-Back Method 5.5 Optical Time Domain Reflectometer (OTDR) 5.6 Differential Mode Losses References6. Dispersion Measurements 6.1 Time Domain Measurements 6.2 Frequency Domain Measurements 6.3 Differential Mode Delay 6.4 Intermodal Dispersion Computed from Index Profiles 6.5 Profile Dispersion References7. Measurements of Fiber and Preform Geometry 7.1 V Value of Single-Mode Fibers 7.2 Fiber Diameter Measurements 7.3 Measurements of Fiber Geometry 7.4 Preform Diagnostics ReferencesIndex