A quasi-distribution optic fiber sensor system based on general optic fibers is presented, in view of the characteristics of
the ordinary optical fiber which is low-cost, adaptable environment and more conducive to the realization of large-scale
and large-scale application than the special fiber. The principle of fiber sensor is introduced. Then, the solution
temperature experiment and concentration experiment are carried; the curves of the fiber loss changing with the solution
temperature and concentration are gained, which are good agreement with expectation value.
A new approach based on the finite element-artificial transmitting boundary method is presented, and the 2-D
acoustical field on the substrate region is calculated by using this method.
A finite element method with artificial transmitting boundary incorporated is firstly applied for acousto-optic tunable filters (AOTF) with weighted coupling. Here, two kinds of weighting function are considered, one is Cosine function, the other is Gaussian function. And the numerical results are shown for AOTF with a tapered acoustical directional coupler with different weighing function on a LiNbO3 substrate. Through comparison, the optical filter responses of the TE-TM mode conversions of AOTF with Gaussian weighting function are better than AOTF with Cosine weighting function. The results are in good agree with others, which illustrates this method is useful in calculation on AOTF.
In an earlier approach, the 2-D acoustical field profiles on the substrate region are often calculated with BPM. In this
paper, we present a new approach based on the finite element - artificial transmitting boundary method and calculate the
2-D acoustical field on the substrate region.
In an earlier approach, the 2-D acoustical field profiles on the substrate region are often calculated with BPM. In this paper, we present a new approach based on the finite element - artificial transmitting boundary method and calculate the 2-D acoustical field on the substrate region.
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