Abstract-An optical frequency shifter on SOI using thermooptic serrodyne modulation is fabricated. It creates a 1 kHz frequency shift in 1550 nm laser, with a second-order harmonic sideband suppression of -39 dB.
We demonstrate a laser Doppler vibrometer (LDV) based on the serrodyne frequency shifting technique. A proof-of-principle system is implemented on the basis of fiber-optic components but opens the way toward an ultracompact integrated LDV system on a silicon chip. With a low laser power of 50 μW, the serrodyne LDV was able to measure submicrometer vibrations with frequencies in the audio range.
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