GyroSil Rad-Hard Polarization-Maintaining (PM) Sensing Fibers for Fiber Optic Gyroscopes feature a Pure Silica core for improved radiation resistance. Gyro fibers have a reduced diameter cladding of 80 μm. They exhibit excellent bend performance in small diameter coils. The fiber has a 1550 nm operating wavelength and is offered with a 145 μm diameter dual acrylate coating.