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N POWER SPLITTERSSWITCHES AND ATTENUATORSMACH-ZEHNDER DEVICESPOLARIZATION DEVICESSUMMARY17. BRAGG GRATINGSGLOSSARY INTRODUCTIONPHOTOSENSITIVITYPROPERTIES OF BRAGG GRATINGSFABRICATION OF FIBER GRATINGSTHE APPLICATION OF FIBER GRATINGS18. single pyramids FOR extensive COMPONENTSNETWORK FUNCTIONSSUBCOMPONENTSCOMPONENTS19. OPTICAL AMPLIFIERS INTRODUCTIONDEVICE BASICSFABRICATIONDEVICE CHARACTERIZATIONAPPLICATIONSAMPLIFICATION OF SIGNALSSWITCHING AND MODULATIONNONLINEAR APPLICATIONSFINAL REMARKS20.