Left: general layout of a 2 telescopes heterodyne interferometer. Right: general layout of an optical correlator. A Mach-Zehnder interferferometer, stabilized at the zero null, is modulated by EOMs placed in each arm. In this configuration, the output of the photodiode contains a term proportional to the product of the RF signals at the input of each modulator. Abbreviations as follows: LO: local oscillator; BS: beam splitter; PD: photo-diode; LNA: low-noise amplifier; LID: lock-in detection; LPF: low-pass filter; PID: proportional integral derivator; AOM: acousto-optic modulator; EOM: electro-optic modulator.
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