Optical fiber bragg grating with improved hydrogen resistance

G - Physics – 02 – B

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G02B 6/028 (2006.01) G02B 6/124 (2006.01)

Patent

CA 2678654

Hydrogen-induced losses in germanium-doped fibers is significantly reduced by increasing the concentration of oxygen in the core region of the glass. The increase in oxygen functions to 'heal' the germanium-deficient defects, thus substantially reducing the sites where hydrogen bonding can intrude. Advantageously, the presence of the excess oxygen does not compromise the ability to create UV-induced gratings in the fiber's core area. Indeed, the stability of the glass has been found to increase even further during UV radiation. Thus, an FBG structure suitable for use in harsh, high temperature environments can be formed.

Selon l'invention, des pertes induites par hydrogène dans les fibres dopées au germanium sont significativement réduites par l'augmentation de la concentration d'oxygène dans la région principale du verre. L'augmentation d'oxygène sert à <= résoudre >= les défauts de germanium insuffisant, réduisant ainsi sensiblement les sites où une liaison hydrogène peut s'imposer. De manière avantageuse, la présence d'oxygène en excès ne compromet pas la capacité à créer des réseaux induits par UV dans la zone principale de la fibre. En effet, la stabilité du verre s'est avérée augmenter encore davantage lors d'un rayonnement UV. Ainsi, une structure de réseau de Bragg sur fibre appropriée pour une utilisation dans les environnements difficiles à température élevée peut être formée.

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