InSiGa's ISG-D5640 is a quad channel 53Gbaud/s differential input, differential output MZ driver die for 400Gbps applications. The driver can support input signals up to 500mVpp differential. The device can have up to 3.5Vpp output swing in linear mode with low Total Harmonic Distortion (THD). ISG-D5640 is designed to be DC coupled to the modulator die. Featuring a channel pitch of 625um, the driver offers SPI control for setting the gain and bias of the driver. It also allows monitoring of the DC standard mode voltage between the driver and modulator to set the modulator bias on the PIC accurately. The chip offers functionality to control the heaters on the Silicon PIC heater and operate two independent CW lasers in an APC loop if desired. The gain and equalization capability of ISG-D5640H can meet the requirements of most switch vendors in the market.