This book offers basic concepts of photonic crystal fibers as well as ways of designing such optical properties as chromatic dispersion, nonlinearity, confinement loss, birefringence, and effective mode area. The state-of-the-art of the aforesaid application specific design problems have also been presented. FEATURES 1. Describes the basic concepts of photonic crystal fibers and their optical properties. 2. Reviews the literature for application specific design problems. 2. Presents ways to design near-zero dispersion- flat photonic crystal fibers with modest design parameters. 3. Presents ways to manage nonlinearity, confinement loss, and dispersion simultaneously. 4. Reviews the numerical computation techniques and describes the finite difference time domain method. 5. Presents birefringence tailoring techniques and a way to designing large effective mode area. 6. Describes applications and future of the photonic crystal fibers. This book can either be used as a design textbook or a reference source for both beginners as well as for graduate students.