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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

Inactive Publication Date: 2016-01-20
HANGZHOU DIANZI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0002] In the current optical communication system, the communication mode of network nodes is still optical-electrical-optical. Due to the influence of electronic devices, the information processing speed is still restricted by the "electronic bottleneck", thus wasting the bandwidth resources of optical fibers.

Method used

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  • Methods for the analysis of signal transmission and switching characteristics in fiber gratings or similar fiber gratings
  • Methods for the analysis of signal transmission and switching characteristics in fiber gratings or similar fiber gratings
  • Methods for the analysis of signal transmission and switching characteristics in fiber gratings or similar fiber gratings

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Embodiment Construction

[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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Abstract

The invention discloses an analysis method of signal transmission and switching characteristics of a fiber bragg grating or a similar fiber bragg grating. The analysis method includes steps: 1 constructing a fiber bragg grating coupled mode equation, 2 determining the border and the starting condition of the fiber bragg grating, 3 performing mesh dividing, 4 discretizing a partial differential equation to an ordinary differential equation, 5 performing numerical solution for the ordinary differential equation obtained in the step 4 in a Runge-Kutta method, and 6 obtaining a transmission coefficient for representing the switching characteristics. The analysis method can accurately analyze the switching characteristics and the signal transmission characteristics, and the analyzed signal transmission characteristics can accurately reflect walk-off, amplitude and width change conditions of signals in the fiber bragg grating.

Description

technical field [0001] The invention belongs to the technical field of optical information, and in particular relates to an analysis method for signal transmission and switching characteristics in nonlinear optical fiber gratings or similar optical fiber gratings. Background technique [0002] In the current optical communication system, the communication mode of network nodes is still optical-electrical-optical. Due to the influence of electronic devices, the information processing speed is still restricted by the "electronic bottleneck", thus wasting the bandwidth resources of optical fibers. Therefore, it is very necessary to use all-optical communication to speed up the network, realize all-optical routing and switching, and overcome the bottleneck effect of electrical relay. Nonlinear fiber grating is an important passive photonic device. The principle of fiber grating optical switch is that when strong incident light enters the fiber grating, the spectrum of the fiber ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/00
Inventor 李齐良唐向宏李承家张世龙胡淼周雪芳钱胜
Owner HANGZHOU DIANZI UNIV
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