Compact temperature-compensating package for long-period fiber gratings

Abstract We propose a compact and reliable temperature-compensating package for negative-strain-coefficient long-period fiber gratings written in standard optical fiber. Gratings which are 3 cm long are packed into aluminum, copper and plexiglas tubes, respectively, under tension. The mounted gratings exhibit lower temperature sensitivity (about 2.0 nm/100°C), compared with uncompensated gratings (about 5.5 nm/100°C). The compensating results are in good agreement with theoretical predictions.