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(Color online) Schematic of active FBG vacuum sensor in a double-clad fiber.
Resonance wavelength shift of a 5 mm optically heated FBG at 173 mTorr. The optical power used to heat the FBG is 0, 10.5, 31, 52, 104, and 145 mW, respectively.
Resonance wavelength shift of a 5 mm FBG as a function of coupled laser power at 173 mTorr, 6.3 Torr, and 745 Torr, respectively.
FBG vacuum sensor operation in constant power mode, the coupled laser powers are 62 and 145 mW, respectively.
FBG vacuum sensor operation in constant temperature mode while the FBG is preheated by the coupled laser power at 150 and 350 mW, respectively.
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