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An electrical method for characterizing optical filters is proposed and demonstrated based on low-frequency detection, which enables magnitude frequency response measurement with hyperfine resolution up to 50 kHz and doubled measuring frequency range in the electrical domain.
A self-reference method for measuring the magnitude frequency response of optical filters is proposed based on nested heterodyne interferometer, which enables high-resolution measurement in the electrical domain with doubled measuring frequency range.
A self-referenced heterodyne method is proposed and demonstrated for frequency response measurement of high-speed electro-optic phase modulators (PMs), which avoids the need for correcting the responsivity fluctuation of the assistant photodetector and extends double measuring frequency range through setting a specific frequency relationship of two driving electrical signals.
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