Group-delay reconstruction for fiber Bragg gratings in ref lection and transmission

The group delay in transmission of an arbitrary fiber Bragg grating can be determined uniquely from the amplitude response. The corresponding quantities in reflection are determined uniquely if the grating is symmetric. For nonsymmetric gratings strict minimum and maximum bounds on the group delay in reflection can be obtained. The results are applied to several different chirped or tapered grating profiles that have appeared in the literature.