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However, no in-fibre integrated miniaturized devices which provide current solutions were suggested as all-optical modulators with sufficient modulation depth and with low power consumption.
To the best of our knowledge this is the first experimental feasibility study of an all-optical modulator with sufficient modulation depth and with low power consumption which is also an in-fibre integrated miniaturized device based upon Si slab.
The Stokes beam was intensity-modulated by an acoustic optic modulator (3080-122, Crystat Technology) at 10 MHz with 80%% modulation depth and then combined with pump beams having a long-pass beam combiner (1064dcrb, Chroma).
The frequency-modulated target was initially defined by 8.5% modulation depth, and the motion target was initially defined by a 350-μs shift, both of which were clearly perceptible by all participants.
The coated Si slab has significantly improved characteristics over a bare Si such as high modulation depth and low power consumption that are obtained due to the coatings.
We use m ∈ [Mmin, Mmax] to denote the modulation depth and define: m ∕ dB = 10 ⋅ log 10 signal power at modulation peaks signal power at modulation valleys.
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This newly designed FLC-SLM has two phase modulation depths and can be driven with the passive matrix addressing scheme.
The influences of various structure parameters on transmission responses are simulated and discussed, including index modulation depths and lengths of three FBGs and cavity lengths.
Due to insufficient signal-to-noise ratio, accurate spatial parameters of the ECDs could not be fitted separately for responses to all modulation depths and sound types, especially for responses to speech and music at the most shallow amplitude modulations.
The special cases of maximum modulation depth (V=1) and the minimum modulation depth (V=0) are examined.
This study proposes a feasible methodology to design an optically controlled terahertz modulator with large modulation depth, high speed and suitable insertion loss, which is useful for terahertz applications in the future.
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