Multimode graded-index fluorine-doped fibers for harsh environments fabricated by MCVD-method

Multimode graded-index fluorine-doped fibers with a record (for the MCVD method) value of the refractive index difference of -0.0115 (NA~0.185) were fabricated and tested at high temperature (up to 300°C) in hydrogen atmosphere (50 atm).