Methods for the analysis of signal transmission and switching characteristics in fiber gratings or similar fiber gratings
A fiber grating and signal transmission technology, applied in the field of optical information, can solve the problem of wasting fiber bandwidth resources
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[0085] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0086] In this example, if image 3 As shown, assuming that the light is only input at port 1, because the reflection starts from the end of the grating, the boundary condition is A f (0,t)=1, 3kw 1 / 2 , A b (L,t)=0 (indicating no reflected signal at the tail of the grating). Assume that the grating has no energy inside at the initial moment, that is, A f,b (z,0)=0. Choose γ=0.1W -1 cm -1 ,λ B =1.55μm,t=4000ps,v g =2.06×10 8 m / s. Figure 4(a) shows the fiber grating at the input amplitude A=1, 3kw 1 / 2 In the case of , the nonlinear transmittance curve varies with the amount of detuning. When the input power is low, the transmittance curve is symmetrical about the detuning amount δ, but as the input power increases, the nonlinear effect causes the band gap to shift to a lower frequency, and the transmittance curve is no longer about the detuni...
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