  Fabrication of nanoscale optical Fiber Bragg Gratings (FBGs) is one of the
key manufacturing processes for fiber optics, which has many important
applications in data communication and distributed remote sensing at a distance
up to hundreds of kms. However, the fabrication of the FBGs is challenging. To
meet such need, we propose a novel method to write the FBGs using high-flux
synchrotron x-ray with a nanoscale gold/Si gratings to modulate the x-ray flux
and thus change the refractive index contrast of the optical fiber to form the
FBGs. The nanoscale gold/Si with high aspect ratio has been fabricated at the
Center for Nanoscale Materials (CNM) at Argonne National Laboratory (ANL) and
the preliminary experiment of x-ray writing of the optical fiber FBGs has been
carried out at the Advanced Photon Source (APS) of ANL. The preliminary
experiment shows promising result of the x-ray writing method of the optical
fiber FBGs.
