A high-bandwidth analog data link using a Mach-Zehnder integrated optic modulator has been constructed. We discuss the parameters involved in the system design, the major problems encountered, and the particular solutions at which we have arrived. The present system uses a diode-pumped YAG laser at 1300 nm and a low-loss Mach-Zehnder interferometer to achieve a large, low-noise optical signal. An InGaAsP photodiode detector followed by a 20-dB wide-band amplifier converts this to an electrical signal for recording on a Tektronix 7250 oscilloscope. We also present some preliminary measurements of the system performance.