A newly developed graded-index polymer optical fiber (GI-POF) with high-temperature and high-humidity stability was proposed. As it was found that the high numerical aperture and high glass transition temperature (Tg) at the core center of the GI-POF were key issues to achieve both high-temperature and humidity stability, a partially fluorinated polymer material was adopted to obtain both characteristics in the GI-POF. The newly developed GI-POF had low-loss (140 dB/km at 650-nm wavelength),high-bandwidth (higher than 1 GHz for 100 m transmission), high-temperature and humidity stability at 70°C, 80% relative humidity (R.H.) and low bending loss.
Takaaki Ishigure, Masataka Sato, Atsushi Kondo, and Yasuhiro Koike, "High-Bandwidth Graded-Index Polymer Optical Fiber With High-Temperature Stability," J. Lightwave Technol. 20, 1443- (2002)