Abstract
Controllable passband and stopband optical filters based on tilted
moiré fiber Bragg gratings (FBGs) are presented. The gratings are
formed by combining two FBGs of equal period, with one of them tilted at a
small angle with respect to the fiber axis. The spectral response consists
of the phase-shifted, narrow resonance-dip main peak, and the discrete
cladding modes. In this paper, we systematically and experimentally
investigated the spectral characteristics of tilted moiré FBGs.
Experimental results demonstrated that, upon changing the tilt angle and
grating length in different combinations, the grating and resonance-dip
bandwidths, and the cladding modes characteristics, can be controlled and
modified. These features enable the flexible design of optical filters with
controllable passband and stopband.
© 2010 IEEE
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