Hollow-Core Polarization Maintaining Photonic Crystal Fiber Our PM-1550-HC Hollow-Core Polarization Maintaining Photonic Crystal Fiber is at the forefront of specialty fiber technology, combining the advantages of hollow-core guidance with high-performance polarization maintenance. Designed for demanding applications in precision sensing, fiber optic gyroscopes, and advanced laser systems. Key Features Hollow-Core Design: Light guidance in an air-filled central core region