title: Temperature compensated microfiber Bragg gratings.
abstract: In this paper, temperature compensated microfiber Bragg grating (mFBG) is realized by use of a liquid with a negative thermo-optic coefficient. The effects of grating elongation and the index change of silica glass are compensated by refractive index change of the liquid through evanescent-field interaction. A reduced thermal sensitivity of 0.67 pm/°C is achieved, which is 1/15 in magnitude of the uncompensated counterparts. Further theoretical analysis demonstrates that temperature insensitivity can be obtained with different combinations of microfiber diameter and the refractive index/thermal optic coefficient of the employed liquid. The proposed method is promising due to the compactness and high flexibility of the device.
authors.affiliation: Institute of Photonics Technology, Jinan University, Guangzhou 510632, China.
authors.forename: Shuai
authors.initials: S
authors.lastname: Gao
authors.forename: Long
authors.initials: L
authors.lastname: Jin
authors.forename: Yang
authors.initials: Y
authors.lastname: Ran
authors.forename: Li-Peng
authors.initials: LP
authors.lastname: Sun
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Bai-Ou
authors.initials: BO
authors.lastname: Guan