VNA program rate can reach 40Gbit / s, the wavelength covers 1310 / 1550nm, optical signal output to the DUT, you can test: IL (Insertion Loss), RL (return loss), S parameters, BW (Bandwidth), S21 (Ripple) Chirp and so on. BERT software PPG module for the 100M-12.5Gb / s electrical signal output, through the light source, photoelectric intensity modulator into the optical signal, through the eye diagram analyzer (optical oscilloscope) can be test:ER(Extinction Ratio,DC Extinction Ration,Dynamic Extinction Ratio),Vdc(DC Half Wave Voltage),V2rf(RF Half Wave Voltage-intensity Modulators),Vprf(RF Half Wave Voltage-Phase Modulator) so on.