Abstract
Low-loss, high reflectivity, first-order fiber Bragg gratings are achieved by pitch-bypitch fabrication methodology in a truly free-standing fiber. Slit beam-profiling adopted attain transversely-extended index modification for each grating period defined by single laser pulse. Fiber Bragg grating of 0.52µm period with >27dB transmission stopband and <0.2dB/cm insertion loss are demonstrated.
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