FIELD: laser and fiber optics.
SUBSTANCE: in accordance to invention, optical wave guide is heated up during recording of Bragg grating up to temperature, which depends on material of optical wave guide, and which is selected to be at least 100°C, but not more than temperature of softening of optical wave guide material, and selected temperature is maintained during time required for recording the Bragg grating.
EFFECT: increased thermal stability of recorded Bragg gratings.
2 cl, 3 dwg
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