Frequently Asked Questions

An uncoated FBG's Bragg wavelength drifts with temperature at about 6.7 ppm/K (roughly +0.11 pm/K at 1550 nm). Athermal packaging offsets this by mechanically compensating the grating's thermal expansion with matched case materials, holding wavelength far more stable than the bare fiber would.

Thermal wavelength stability is better than 0.16 nm across the 0 °C to +70 °C range.

The standard package measures 66 × 18 × 12 mm; gratings inside can have lengths from 1 to 20 mm and reflectivity from 5% to 99%.