Tunable dual-passband microwave photonic filter realization device and method
A technology of microwave photons and implementation methods, which is applied in optical fiber transmission, two-way transmission, electromagnetic transmitters, etc., can solve the problems of frequency difference, signal-to-noise ratio degradation, and affect the stability of the filtering system, achieve good stability, and solve the problem of degradation. Effect
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[0041] Combine below Figure 1-Figure 8 , take the experimental results as an example to further illustrate the present invention.
[0042] According to this embodiment figure 1 and figure 2 The shown structure and principle build a tunable dual-passband microwave photonic filter based on stimulated Brillouin scattering, and the lengths of the single-mode fiber and the highly nonlinear fiber used are 25.2km and 1km, respectively. Using single sideband modulation method and vector network analyzer to test, the Brillouin frequency shifts in single-mode fiber and highly nonlinear fiber are respectively 10.862GHz and 9.644GHz. The test results are as follows image 3 and Figure 4 shown. In addition, this embodiment uses a distributed feedback (DFB) laser as a narrow linewidth light source with a central wavelength of 1549.901nm, Figure 5 The output spectrum obtained from the test is given. The narrow-linewidth light wave output by the laser is divided into upper and lower...
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