Customizable apodized chiral fiber grating apparatus and method

   
   

A apodized chiral fiber grating consists of a chiral fiber with a variable effective grating strength along different regions of its length, such that the effective grating strength gradually increases from one end of the chiral fiber until a peak effective grating strength is reached and then gradually decreases at the same rate towards the other end of the fiber. Optionally, the effective grating strength remains stable for a portion of the fiber before decreasing. Other forms of grating strength variations in different regions of the chiral fiber are also contemplated. The effective grating strength variation produces an apodized chiral fiber that possesses desirable characteristics that greatly reduce or eliminate the sidelobes in the fiber's spectral response. The effective grating strength is varied by modulating the pitch of the apodized chiral fiber along different regions of its length in accordance with a mathematical expression, such as for example: linear, polynomial, sinusoidal or quasi-sinusoidal function. Advantageously, the inventive apodized chiral fiber is customizable to any application by selectively controlling the pitch variation along the different regions.

 
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