 Particle Swarm Optimization Design of Optical Directional Coupler Based on Power Loss Analysis - EuropubPublishers keywords: Optical fiber, Optical communication, Optical directional coupler, Particle swarm optimizationPınar Özkan-Bakbak Department of Electrical and Communication Engineering, Yildiz Technical University, Istanbul, Turkey, Musa Peker Karabuk University, Computer Engineering Department, 78050, Karabuk, Turkey, Email: email protected 