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

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...

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