Short-wavelength, transmission-loss suppression in Fibre Bragg Gratings (original) (raw)
StRllgth. In this paper, we report on a novel method for reducing cladding-mode transmission losses in standard FBG's. We show that short wavelength, transmission losses can be practically eliminated by damping the resonant excitation of the cladding modes. The damping is achieved by properly introducing a substantial propagation loss into the cladding modes. For maximum effect, the core mode should experience no extra propagation losses. By applying a thin lossy layer on the fibre cladding surface, a reduction of cladding-mode- losses of about 12dB was achieved. Transmission-loss suppression The cladding mode attenuation can be easily achieved by depositing a thin lossy layer on the cladding surface. Alternatively, the same effect can be accomplished by introducing one or more lossy layers into the fibre cladding during the fabrication process. The latter will result in a stronger cladding-modellossy-material overlap and, therefore, produce higher propagation losses.
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