A new method for the calibration of intensity modulators and modulated
laser diodes at millimeter-wave frequencies is presented. The method
uses an integrated-optic modulator as both a mixer and a frequency dou
bler. To demonstrate the measurement technique an intensity modulator
is calibrated over the band 26.5-40 GHz. The measurement system employ
s no components exceeding 20 GHz (excluding the RF generator), and wit
h relatively minor modifications measurements in excess of 60 GHz are
feasible.