Electro-optical tuning flat filter
A filter and flat-top technology, applied in the coupling of optical waveguides, instruments, optics, etc., can solve problems such as large voltage, achieve the effect of small spectral frequency interval, overcome large voltage, and high-speed tuning characteristics
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[0032] see first figure 1 , as can be seen from the figure, the electro-optical tuning flat-top filter of the present invention includes an input fiber 1, a collimating lens 2, a polarizer 3, and K (K≥1) cascaded analog birefringence modules are arranged in sequence along the direction of the light beam. 4. The analyzer 5, the focusing lens 6 and the output fiber 7.
[0033] The K cascaded simulating birefringence modules are sequentially composed of simulating birefringence modules 401 , 402 . . . , 40K cascaded. The structure of the above-mentioned simulated birefringence module is as follows figure 2 shown. The simulated birefringence module of this structure consists of an input polarization rotator 401-1, a polarization beam splitter 401-2, a first medium 401-3, a second medium 401-4, a half-wave plate 401-5, and a polarization beam combiner 401 -6 and the output polarization rotator 401-7. The first medium 401-3 is a rectangular sheet in shape, and the shape of the ...
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