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An in-fiber Mach–Zehnder interferometer (MZI) was fabricated and characterized for solution refractive index (RI) sensors. The MZI consists of two cascade double cladding fibers (DCFs) in a standard single mode fiber (SMF). The DCFs serve as the in-fiber couplers which split and combine light propagating in the core and the outer cladding region. Since the cladding mode is excited, the interference...
A novel surface-enhanced Raman scattering (SERS) optical fiber sensor using biconical taper fiber is proposed. It is fabricated by fused tapering a multi-mode fiber and then coated the silver colloid on its waist. The Raman spectrum for R6G dye solution is obtained and the detection sensitivity is up to 10-9M.
A surface-enhanced Raman scattering (SERS) optical fiber sensor using biconical taper multi-mode fiber (MMF) is proposed. It is fabricated by fused elongating a multi-mode fiber and then coated the silver colloid on its waist. The Raman spectrum for R6G dye solution is measured and the detection sensitivity is 10-9 M.
We demonstrate experimentally that the new resonance dips can be generated during the fabrication of CO2 laser written long-period fiber gratings (LPFGs) in a single-mode fiber (SMF) under tension. The dynamic analysis of laser writing process was adopted to study the mechanism of the grating inscription. The new characteristics of grating growth were observed except for the increase of writing efficiency...
A novel Surface-enhanced Raman Scattering (SERS) sensor combining with fused taper optical fiber and the film of the silver sols is proposed. We demonstrate the sensing principle and the feasibility of the SERS sensor. Accordingly, the Raman spectrum of R6G is obtained. The detecting concentration is up to 10−7M.
A novel liquid-level sensor was proposed and studied by using a specialty double-cladding fiber (DCF). The resonant wavelength shift of DCF linearly depends on the fraction change of DCF immersed into the liquid. The sensor has the advantages large linear response range, high sensitivity and simple structure etc.
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