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What fraction of the data pulse energy is actually contained in the sound wave?

April 26, 2017actually Data energy fraction pulse sound wave

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What fraction of the data pulse energy is actually contained in the sound wave?

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In the interaction of the light waves and the acoustic wave, one data photon (νd~193 THz) is converted to a write photon (νb~9.6 GHz) and an acoustic phonon. Therefore, only a tiny fraction (νb/νd~5X10-5) of the data pulse energy is contained in the induced sound wave, and most of the data pulse energy is transferred to the write pulse.