Bragg gratings in polyimide coated optical fiber. Polyimide is a heat-resistant polymer that performs to 300°C and has high strength, abrasion- and chemical-resistance. Applied to a thickness of only 15 ?m, the result is a small form factor fiber of 155 μm diameter.|Bragg gratings in polyimide coated optical fiber. Polyimide is a heat-resistant polymer that performs to 300°C and has high strength, abrasion- and chemical-resistance. Applied to a thickness of only 15 ?m, the result is a small form factor fiber of 155 μm diameter.

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