Tailored chirped fiber Bragg gratings using tapered elastic plates

A chirped fibre Bragg grating (CFBG) fabrication method, which enables us to tailor a dispersion compensator with an arbitrary group delay profile, has been proposed. This method is very simple to realize because it takes advantage of strain gradient induced by the attached plate rather than the optical fiber itself. The chirp profile can be adjusted arbitrarily by changing the plate shape and the applied strain. Thus, the method is best suitable for high order dispersion compensation that needs nonlinear dispersion property. We demonstrated two types of CFBG´s that have linear and hyperbolic group delay profiles. The group delay ripple was less than 20 ps. In the experiment we used acryl plates that have low elasticity, and thus, the material is not eligible for a dynamic control of dispersion compensator. For use as a dynamic dispersion compensator, we should use a high elastic material, which is under study now.