The 400G QSFP-DD ZR+ is designed to 100G/200G long haul and 300G/400G Metro IP over DWDM applications without inline chromatic dispersion compensation. 400G DP-16QAM modulation format. With one VOA inside the TX optical path the out output optical power has 4dB attenuation window. QSFP-DD is a new module and cage/connector system similar to current QSFP, but with an additional row of contacts providing for an eight lane electrical interface. 3), where RS is the receiver sensitivity, and SECQ is the SECQ of the transmitter used to measure the receiver. The InnoLight's 400G QSFP-DD is on of the first 400G optical transceiver on the market and it allows to communicate up to 2km in PSM4. The InnoLight solution is based on the INPHI chipset, the IN010C50 PAM4 DSP, the four GaAs laser driver dies, and a TIA die, all designed by INPHI. The transceivers. InnoLight 100G OpenZR+ QSFP-DD product family is designed based on dual polarization quadrature phase shift keying (DP-QPSK), supporting extended C-band, polarization diversity coherent detection and advanced electronic link equalization. Please refer to the respective datasheets for more techn Rx sensitivity. Dispersion/path penalties not ta.