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Synthesis method of fiber Bragg grating with triangular reflective spectrum

A technology of fiber Bragg and synthesis method, which is applied in the direction of cladding optical fiber, optical waveguide and light guide, etc., can solve the problems that fiber Bragg grating only has a rectangular reflection spectrum, low operating efficiency, long grating length, etc., and achieve the reduction of maximum refractive index modulation, The effect of high operating efficiency and short grating length

Inactive Publication Date: 2011-02-02
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The invention provides a method for synthesizing fiber Bragg gratings to solve the problems in the prior art that the fiber Bragg grating synthesis method has low operating efficiency, the designed grating is too long, the structure is complex, and the fiber Bragg grating only has a rectangular reflection spectrum.

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  • Synthesis method of fiber Bragg grating with triangular reflective spectrum
  • Synthesis method of fiber Bragg grating with triangular reflective spectrum
  • Synthesis method of fiber Bragg grating with triangular reflective spectrum

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[0033] The content of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Such as figure 1 Shown:

[0035] Set the target reflectivity R of the fiber Bragg grating t , Calculate the corresponding coupling coefficient q(q 1 , Q 2 ,...Q n );

[0036] For delamination algorithm (DLP), it uses reflection matrix T ρ And phase shift matrix T Δ Instead of the transmission matrix T, that is, T=T ρ ×T Δ . Among them, the reflection matrix T ρ It can be expressed as:

[0037] T ρ = ( 1 - | ρ | 2 ) - 1 / 2 1 - ρ * - ρ 1 - - - ( 1 )

[0038] Phase shift matrix T Δ It can be expressed as:

[0039] T Δ = exp ( iδΔ ) 0 0 exp ( - iδΔ ) - - - ( 2 )

[0040] The complex reflection coefficient can be expressed as:

[0041] ρ = - tanh ( | q | Δ ) q * | ...

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Abstract

The invention relates to a synthesis method of a fiber Bragg grating with a triangular reflective spectrum, mainly solving the problems that the existing synthesis method of the fiber Bragg grating has low operating efficiency, the length of the designed grating is too long, the structure is complicated, only rectangular reflective spectrum can be obtained, etc. The method comprises the following three steps: 1) obtaining the initial conditions; 2) reconstructing the coupling coefficient; and 3) synthesizing the fiber Bragg grating. The method is easy and efficient, and can overcome the defects of the traditional synthesis method of the fiber Bragg grating. By using the method of the invention, the fiber Bragg grating with the triangular reflective spectrum can be designed; and the designed fiber Bragg grating with the triangular reflective spectrum has the advantages of short length and no chirp. Meanwhile, the refractive index modulation can be effectively reduced, thus the large-bandwidth fiber Bragg grating can be designed.

Description

Technical field [0001] The invention relates to a method for synthesizing fiber Bragg gratings, in particular to a method for synthesizing triangular reflection spectrum fiber Bragg gratings. Background technique [0002] Fiber Bragg Grating (FBG) has the advantages of small size, good wavelength selectivity, insensitivity to polarization, low additional loss, good coupling, etc. This makes optical devices based on fiber gratings become ideal devices in all-optical communication networks, such as Optical filters, optical sensors, lasers, dispersion compensators, etc. [0003] When designing fiber Bragg gratings, the transmission matrix method is generally used traditionally. That is, given various grating parameters (such as sampling, chirp, apodization), the transmission matrix method is used to obtain characteristics such as reflectance and dispersion. Although it is very straightforward to design fiber Bragg gratings using the transmission matrix method, it is not convenient i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/02
Inventor 刘雪明宫永康
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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