We report experimental links at frequencies up to 4 GHz which use two
integrated optical Mach-Zehnder interferometric modulators in series t
o reduce third-order intermodulation distortion, This design improves
the intermodulation-free dynamic range (up to 88 dB with 1 MHz noise b
andwidth is demonstrated) with no noise figure penalty relative to a l
ink using a standard modulator. Detector current is low (<2 mA), which
is necessary for the detector to provide adequate linearity.