1. Product Title PM Fiber Polarizer – 780 to 1950 nm In-Line Polarization Maintaining Polarizer 2. Product Overview GracyFiber PM Fiber Polarizer is a 1×1 in-line polarization device designed to provide controlled linear polarization across wavelength options from 780 nm to 1950 nm . The product combines low insertion loss with high polarization extinction, with the supplied product information specifying insertion loss as low as 0.3 dB and extinction ratio up to 30 dB . 3.