8.2.3 Coherent Communications 245
8.2.4 Integrated Optics 246
8.2.5 Laser Doppler Anemometry and Velocimetry 247
8.2.6 EDFA Pump Combiners, Reflection-Suppression
Schemes, Current Sensing, and Optical Coherence
Tomography 249
8.3 How Do PM Fibers Work? 249
8.4 PM Fiber Types: Stress and Form Birefringent 250
8.4.1 Stress-Birefringent Fibers: Bowtie, PANDA,
and Elliptical Jacket 250
8.4.2 Elliptical Core, Form-Birefringent Fiber 253
8.4.3 Microstructure (‘‘Holey’’) Fibers 254
8.4.4 Polarizing Fiber 254
8.5 PM Fiber Fabrication Methods 256
8.5.1 Bowtie Fibers 256
8.5.2 PANDA Fiber 258
8.5.3 Elliptical Jacket Fiber 258
8.5.4 Elliptical Core, Form-Birefringent Fiber 260
8.5.5 Microstructure (‘‘Holey’’) Fibers 261
8.6 Key Performance Parameters 262
8.6.1 Attenuation ...