Improved gas sensor with air-core photonic bandgap fiber
Saeed OLYAEE , Hassan ARMAN
Front. Optoelectron. ›› 2015, Vol. 8 ›› Issue (3) : 314 -318.
Improved gas sensor with air-core photonic bandgap fiber
The propagation loss of a fiber can be increased by coupling core mode and surface mode which will deteriorate the performance of photonic bandgap fiber (PBGF). In this paper, we presented an air-core PBGF for gas sensing applications. By designing Λ = 2.63 µm, d = 0.95 Λ, and Rcore= 1.13 Λ, where Λ is the distance between the adjacent air holes, the fiber was single-mode, no surface mode was supported with fiber, and more than 90% of the optical power was confined in the core. Furthermore, with optimizing the fiber structural parameters, at wavelength of λ = 1.55 µm that is in acetylene gas absorption line, significant relative sensitivity of 92.5%, and acceptable confinement loss of 0.09 dB/m, were simultaneously achieved.
gas sensor / photonic bandgap fiber (PBGF) / sensitivity / surface modes / air core radius / confinement loss
Higher Education Press and Springer-Verlag Berlin Heidelberg
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