Abstract

We report light propagation with a group velocity of only $300\mathrm{km}/\mathrm{s}$, a group index of 1010, and a group delay of 42 ns, in a strong apodized fiber Bragg grating 12.5 mm in length. The grating was fabricated in a deuterium-loaded fiber using a femtosecond laser and a phase mask, followed by annealing to reduce residual losses. Data analysis indicates a strong index modulation of $1.98\times {10}^{-3}$ and an ultra-low single-pass power loss of 0.010 dB.

© 2015 Optical Society of America

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