title: Observation of symmetrical reflection sidebands in a silica suspended-core fiber Bragg grating.
abstract: We have observed symmetrical sidebands in reflection from Bragg grating written in a silica suspended-core fiber, which are caused by longitudinal periodic refractive index modulation in the Ge-doped suspended-core fiber with a core diameter of approximately 1.3 microm. Our simulation shows that the effective refractive index of the guided mode varied by 0.023% along the fiber with a period of approximately 650 microm. The periodic index variation can lead to amplitude modulation of fiber Bragg gratings, which can be studied by observing the spectra of a fiber Bragg grating written in the Ge-doped core. In addition, we have also characterized the temperature and strain responses of the fiber Bragg gratings, and showed that both responses in the suspended-core fiber are 20 to 25% lower than that of a fiber Bragg grating written on a conventional fiber.
authors: Photonics Research Centre, Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China. eemlvtse@inet.polyu.edu.hk
authors: M L V
authors: ML
authors: Tse
authors: K M
authors: KM
authors: Chung
authors: L
authors: L
authors: Dong
authors: B K
authors: BK
authors: Thomas
authors: L B
authors: LB
authors: Fu
authors: K C D
authors: KC
authors: Cheng
authors: C
authors: C
authors: Lu
authors: H Y
authors: HY
authors: Tam
mesh_terms: D004867:Equipment Design; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008027:Light; D055100:Optical Fibers; D012031:Refractometry / Q000295:instrumentation*; D012822:Silicon Dioxide; D013696:Temperature; D014159:Transducers
chemical_list: D012822:Silicon Dioxide