Chirp long period optic fiber grating for compensating wide band dispersion and its producing method

A fiber grating and long-period technology, applied in optics, nonlinear optics, optical waveguide coupling, etc., can solve problems such as narrow compensation bandwidth, strong nonlinear effect, and inability to compensate dispersion slope, achieving wide bandwidth and reducing costs Effect

Inactive Publication Date: 2007-06-27
BEIJING JIAOTONG UNIV
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Problems solved by technology

Dispersion compensating fiber (DCF) has the disadvantages of large insertion loss, strong nonlinear effect, and inability to compensate dispersion slope.
Although the chirped fiber Bragg grating (CFBG) used for dispersion compensation has the characteristics of small insertion loss, easy tuning, and low sensitivity to nonlinearity, its compensation bandwidth is narrow and can only satisfy single-channel compensation; in DWDM systems, different The CFBG of different wavelengths compensates the dispersion of different channels, which is very expensive, and the unbalanced reflectance between CFBGs and the crosstalk between channels bring more trouble to the transmission system; Proximion of Sweden has developed an ultra-wideband CFBG makes up for the above shortcomings, but this method is very complicated, extremely expensive, and difficult to implement

Method used

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  • Chirp long period optic fiber grating for compensating wide band dispersion and its producing method
  • Chirp long period optic fiber grating for compensating wide band dispersion and its producing method

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] Step 1: First, make a CLPG with stable characteristics, flat spectrum, wide bandwidth, linear delay, constant dispersion and large dispersion value, small ripple coefficient, small loss, and non-linear insensitivity, so as to meet broadband dispersion Compensation requirements, and the performance of the system will be the best after compensation; therefore, a production system specially used for making CLPG is designed and its production method is proposed;

[0033] Step 2: The production system has the ability to write ultra-long-length fiber gratings, and has the ability to precisely control the periodic change of the grating, and properly adjust each parameter to achieve the best CLPG performance;

[0034] Step 3: When CLPG is used for dispersion compensation, two identical CLPGs are cascaded, and the cascading method is that the end...

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Abstract

The invention discloses method for compensating broadband continuous dispersion by using two-cascaded identical chatter long period optical fiber grating (CLPG) in super length. The invention also discloses system and method for fabricating CLPG designed based on the said compensation method. Combining device for drawing in and releasing optical fiber with accurate shifter in fabricating system controls following operations: moving optical fiber in write procedure; drawing in and releasing optical fiber synchronistically; writing in super length; drawing in written CLPG. Tensile adjustment makes writing procedure possess high repeatability and stable. Through adjustment of optical fiber, laser from CO2 laser device focused on optical fiber is written into CLPG. Features are: wide bandwidth, large compensation quantity of dispersion, small ripple and loss, weak nonlinearity, and low cost.

Description

technical field [0001] The invention relates to a method for compensating broadband dispersion by using chirped long-period fiber gratings and the designed chirped long-period fiber grating manufacturing system and method, which belong to the technical field of dispersion compensation for optical fiber communication systems. Background technique [0002] Optical fiber dispersion is the main limiting factor for long-distance, high-speed, dense wavelength division multiplexing (DWDM) optical fiber communication system transmission, so dispersion compensation is one of the most critical technologies in the transmission system. For dispersion compensation, the most commonly used methods are dispersion compensating fiber (DCF) technology and chirped fiber Bragg grating (CFBG) dispersion compensation technology. Dispersion compensating fiber (DCF) has the disadvantages of large insertion loss, strong nonlinear effect, and inability to compensate dispersion slope. Although the chi...

Claims

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Application Information

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IPC IPC(8): G02B6/34H04B10/02G02F1/35H04B10/2525
Inventor 李彬王燕花鲁韶华汪滢莹许鸥
Owner BEIJING JIAOTONG UNIV
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