Features: 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) Insulation resistance: ≥2 x 10,000mΩ/500V DC 4) Voltage-resistance strength: non-puncture, no arc-over under 3kV DC/1min 5) Environment: a) Environmental temperature: -25°C ~ +60°C b) Relative humidity: