Usage and properties: 1) Long-distance and local light transmission network 2) Data transmission network, various kinds of testing and self-control system 3) Realized the connection of the transmission of the fiber optical 4) Applies high precision zirconia bushing, low insertion loss, high return loss, good interchangeability and repeat push-pull performance, easy to use Main technical indexes: 1) Insertion loss: 1.31, 1.55um LD lamp-house, SM≤0.18dB, MM≤0.30dB 2) Return loss: 1.31, 1.55um LD lamp-house, SM PC≥45dB, UPC≥50dB, APC≥60dB 3) Tensile strength: 0 - 15kg (except for φ0.9 fiber) 4) Oscillating test: