DE 102009057186 A1 UPAB: 20110621 NOVELTY - The optical isolator is provided with a Faraday rotator (6) arranged between two polarizers or a polarizer and a quarter shaft plate, where the polarizers are formed by polarizing optical fibers (4,5). The components of the optical insulator are designed as fiber-optical elements and integrated into an optical fiber. USE - Optical isolator. ADVANTAGE - The optical isolator is provided with a Faraday rotator arranged between two polarizers or a polarizer and a quarter shaft plate, where the polarizers are formed by polarizing optical fibers, and thus ensures a simple and improved optical isolator.