A single-mode fluorotellurite glass fiber was reported for the first time.
Fluorotellurite glass fiber is of low loss of ∼1.91 dB/m at 1550 nm.
The infrared window is extended from 2.8 μm to 4.2 μm.
The fiber is with large effective nonlinear parameter γ of 236.7 W−1 km−1 at 1550 nm.