Multichannel fiber bragg grating chromatic dispersion compensator

A dispersion compensator and fiber grating technology, applied in the field of optical information, can solve the problems of increasing the difficulty and cost of production, and achieve the effect of improving utilization rate, high energy efficiency and easy realization

Inactive Publication Date: 2012-10-31
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in phase-sampling fiber gratings, in order to achieve the required multi-channel and high energy efficiency, large dispersion compensation devices must be written by precisely modulating the refractive index of the fiber, and its accuracy reaches the sub-micron level, which increases the The difficulty and cost of making

Method used

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  • Multichannel fiber bragg grating chromatic dispersion compensator
  • Multichannel fiber bragg grating chromatic dispersion compensator
  • Multichannel fiber bragg grating chromatic dispersion compensator

Examples

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Embodiment 1

[0024] This embodiment provides a multi-channel fiber grating dispersion compensator, which uses an optical fiber as a base material, and the grating written on it is an interleaved amplitude sampling grating. In one sampling period, it includes i grating periods with different central wavelengths. The sampling function for one sampling period is expressed as:

[0025] s i ( z ) = rect ( z - p i / 2 p i ) ⊗ Σ m δ ( z - mP ) exp [ - j 2 πm ...

Embodiment 2

[0041] This embodiment adopts the following parameters: the corresponding central wavelength of the interleaved amplitude sampling grating is λ 1 =1547.977nm, λ 2 =1550nm, λ 3 = The chirp coefficients of 1552.023nm are c 1 、c 2 、c 3 , the specific parameter is c 1 =5.70×10 -5 , c 2 =c 3 =0( image 3 Curve 1), c 1 =c 2 =c 3 =1.90×10 -5 ( image 3 Curve 2) and c 1 =c 2 =c 3 =1.90×10 -5 ( image 3 Curve 3), other parameters are with embodiment one.

[0042] See attached image 3 , which is the reflection spectrum of the interleaved amplitude sampling grating with different center wavelengths under the same total chirp amount. Among them, curve 1 (square point curve) is only λ 1 Chirp occurs (c 1 =5.70×10 -5 , c 2 =c 3 =0) graph; curve 2 (circular point curve) is λ 2 , lambda 3 Chirp occurs while λ 1 Chirp does not occur (c 2 =1.90×10 -5 , c 3 =3.7×10 -5 , c 1 =0) graph; Curve 3 (triangular point curve) is λ 1 , lambda 2 , lambda 3 Simultaneous ...

Embodiment 3

[0045] In this embodiment, the following parameters are used: the chirp coefficient and the center wavelength of the interleaved amplitude sampling fiber grating are respectively λ 1 =1547.977nm, λ 2 =1550nm, λ 3 = Corresponding to 1552.023nm, respectively: c 1 =c 2 =c 3 =1.26×10 -5 ; Traditional amplitude-type sampling fiber grating center wavelength λ 0 = The chirp coefficient of 1550 is c 0 =3.78×10 -5 . Other parameters are the same as those in Embodiment 1.

[0046] See attached Figure 5 , it can be seen from Figure (a) that when the traditional amplitude sampling grating is chirped, the reflection spectrum will overlap adjacent spectra due to the broadening of the spectrum, and the isolation between channels will decrease, which affects the grating It can be seen from Figure (b) that under the same total chirp coefficient, the spectral isolation between the reflection channels of the interleaved amplitude sampling grating provided in this embodiment is still g...

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Abstract

The invention discloses a multichannel fiber bragg grating chromatic dispersion compensator. Gratings carved on fibers serving as base materials are interleaved amplitude sampling gratings, and the interleaved amplitude sampling gratings comprise multiple grating periods with different central wavelengths in a sampling period; and the gratings with different central wavelengths are written, and when the chirp of the grating periods with different central wavelengths synchronizes, the obtained chirp of spectra is the sum of the chirp of each central wavelength. By utilizing the method, the energy utilization ratio of the gratings can be improved effectively, and a reflecting channel with high energy efficiency is obtained; and the interleaved amplitude sampling gratings have the effect of chromatic dispersion superposition, so that the small chirp of each grating with different central wavelengths occurs so as to obtain large chromatic dispersion and avoid the superimposing phenomenon of the adjacent spectra caused by overlarge chirp coefficients. The invention provides the chromatic dispersion compensator with narrow band, wide broadband and high energy efficiency, and provides a new concept for the design of different grating chromatic dispersion compensators.

Description

technical field [0001] The invention relates to a fiber grating dispersion compensator, in particular to a multi-channel fiber grating dispersion compensator, which belongs to the technical field of optical information. Background technique [0002] Multi-channel Bragg fiber gratings have attracted more and more attention in the manufacture of multi-channel dispersion compensators and filter systems. For ultra-long-distance, high-speed Dense Wavelength Division Multiplexing (DWDM) transmission systems, fiber Bragg grating dispersion compensation is an effective dispersion compensation method, which has low cost, simple structure, small insertion loss and reliable performance. and other advantages have been widely used. [0003] Traditional multi-channel fiber grating dispersion compensation is realized by two kinds of gratings. One is the amplitude sampling fiber grating, and the other is the phase sampling fiber grating. In the production process of sampled fiber grating...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/34G02B6/02H04B10/18H04B10/2525
Inventor 王钦华朱晓军葛静张桂菊
Owner SUZHOU UNIV
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