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An in-line Mach-Zehnder interferometric refractive index (RI) sensor is demonstrated by concatenating two single-mode fiber (SMF) half-tapers separated by one section of SMF. The cladding modes excited at the first half-taper interferes with the core mode at the second half-taper to generate the interference fringe. Theoretical and experimental results consistently show that the interference fringe...
Characteristic of two cascaded Mach-Zehnder interferometers based on spherical-shape structures is investigated. When the light in the fiber core is excited into high-order cladding mode, part of the light can propagate along the fiber cladding for a long distance. By cascading two identical interferometers formed by dual spherical-shape structures, it proves that the high-order cladding modes are...
A methylcellulose (MC) coated humidity sensor by using photonic crystal fiber (PCF) based Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. It is fabricated by sandwiching a PCF between two standard single mode fibers (SMFs) with the air holes of the PCF in the fusion splicing region being fully collapsed. Experimental results show that this structure can not only carry...
Recently, some fiber sensing applications by coating graphene oxide or reduce graphene oxide have been proposed. In this paper, a novel humidity sensor based on core-offset fiber Mach-Zehnder interferometer coated graphene oxide film has been carried out. Here, we use the chemical method to deal with the surface of the fiber first, and then coated graphene oxide on the surface of the optical fiber...
A system based on the Mach-Zehnder low-coherence interferometer for simultaneously measurement in the field of temperature and strain is presented. This system utilizes the principle of the optical path difference modulation and the coherence length modulation in the low coherence interferometer. After frequently testing the interference signal influenced by the temperature and the strain, the sensitivity...
In this paper, a new structure of optical add-drop multiplexer based on cascaded phase shifted linearly chirped fiber Bragg grating (CPSLCFBG) and Mach-Zehnder Interferometer (MZI) is proposed. The spectrum of drop port and output port of the OADM is analyzed using transmission matrix method by optimizing of CPSLCFBG with Cap apodization function. At the port of the drop and the output, which has...
A miniature pH sensor by using a tapered thin-core optical fiber based Mach-Zehnder interferometer coated with a pH sensitive film is demonstrated. Polyvinyl alcohol (PVA) and polyacrylic acid (PAA) were used to form a membrane structure on the taper by laminating self-assembly technique. By measuring wavelength change of the interference pattern or optical intensity, we achieved high sensitivity...
We design and fabricate a silicon based 1×2 optical switch based on the free-carrier plasma dispersion effect, with a Mach-Zehnder interferometer structure on silicon-on-insulator (SOI) wafer. The experimental result shows that it has an extinction ratio of 21.8 dB at 1546 nm, which meets the requirements of the most applications in optical telecommunication networks.
A simple and compact all-fiber sensor based on a sandwich fiber structure for simultaneous measurement of refractive index and temperature is proposed and demonstrated. The sensing element was made by cascading two core-offset attenuators with a fiber Bragg grating (FBG) in between. The two core-offset attenuators make up a Mach-Zehnder interferometer. The transmission spectrum would shift with the...
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