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Reversal design method of optical fibre Bragg grating based on mix optimization algorithm

A technology of fiber Bragg and optimization algorithm, which is applied in the direction of cladding optical fiber, optical waveguide light guide, optics, etc., can solve the problems of long grating length, complex structure, low operating efficiency, etc., and achieve the effect of short length

Inactive Publication Date: 2012-12-19
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

[0006] The technical problem solved by the present invention is: it relates to a reverse design method of fiber Bragg grating based on a hybrid optimization algorithm, which overcomes the low operating efficiency of the fiber Bragg grating design method in the prior art, the designed grating length is long, the structure is complex, the reflection The spectrum is mainly rectangular, etc.

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  • Reversal design method of optical fibre Bragg grating based on mix optimization algorithm
  • Reversal design method of optical fibre Bragg grating based on mix optimization algorithm
  • Reversal design method of optical fibre Bragg grating based on mix optimization algorithm

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specific Embodiment approach

[0033] Such as figure 1 Shown, the specific embodiment of the present invention is as follows:

[0034] Step 100: Obtain the initial range of refractive index modulation, that is, set the target reflectivity of the fiber Bragg grating , get the corresponding coupling coefficient, and obtain the upper boundary of the initial range of DC refractive index modulation through the coupling coefficient and the lower bound ;

[0035] The specific process is as follows:

[0036] Setting the Target Reflectivity of Fiber Bragg Gratings , using the discrete layer peeling algorithm to calculate the corresponding coupling coefficient, so as to obtain the value of DC refractive index modulation :

[0037] For the discrete layer peeling algorithm, the transfer matrix T reflected matrix and propagation matrix instead of the product of .

[0038] The complex reflection coefficient can be expressed as

[0039] (1)

[0040] in The comp...

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Abstract

The present invention relates to a reversal design method of optical fibre Bragg grating based on mix optimization algorithm, comprising: obtaining a modulating range of the initial refractive index through the steps of setting the target reflectivity of the optical fibre Bragg grating, obtaining the corresponding coupling coefficient, obtaining the modulating range of the direct-current refractive index by the coupling coefficient; reconstructing the refractive index modulation through the steps of using upper boundary and the lower boundary of the direct-current refractive index modulation as initial conditions, using the quantum particle swarm optimization to reduce the adaptive value function, thereby obtaining the optimized direct-current refractive index modulation; designing the optical fibre Bragg grating through the steps of designing producing the optical fibre Bragg grating according to the optimized direct-current refractive index modulation, the grating length and the period parameter,.

Description

technical field [0001] The invention relates to a design method of an optical fiber Bragg grating, in particular to a reverse design method of an optical fiber Bragg grating based on a hybrid optimization algorithm. Background technique [0002] Fiber Bragg gratings (FBG, that is, fiber Bragg gratings) have small size, good wavelength selectivity, good stability, good repeatability, insensitive to polarization, small additional loss, good coupling, variable shape, suitable for embedding large The structure is medium, which makes optical devices based on fiber Bragg gratings ideal key devices in all-optical communication networks, such as fiber lasers, fiber optic filters, fiber sensors, dispersion compensators, etc. [0003] The design of fiber Bragg grating mainly includes forward design and reverse design. Forward design means that when the parameters of the grating are known, the reflectivity, dispersion and other characteristics of the grating are obtained by applying t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02G02B27/00
Inventor 姚勇于雪莲田佳峻刘超孙云旭
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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