Abstract
In this paper, identical dual-wavelength fiber Bragg gratings (FBGs) are theoretically proposed and
experimentally demonstrated. On the assistance of the Fourier theory, the gratings with symmetrical spectrum are
designed in the case of weak refractive-index modulations. With the perturbation technique, the results achieved in
the previous step are modified to meet the strong refractive-index modulation gratings. Based on the coupled-mode
theory, we have optimized and achieved the identical dual-wavelength FBGs with two channels that have equal
bandwidth and even strength. We have also experimentally demonstrated the proposed FBGs, and the experimental
results are compared with theoretical predictions with good agreement.
© 2007 IEEE
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