Regular paper

[OPTICAL REVIEW Vol. 15, No. 5 (2008) 230-235]
© 2008 The Optical Society of Japan

Mach–Zehnder All-Fiber Interferometer Using Two In-Series Fattened Fiber Gratings

Ruth I. MATA-CHÁVEZ^*, Alejandro MARTÍNEZ-RÍOS, Ismael TORRES-GÓMEZ, Romeo SELVAS-AGUILAR¹, and Julián M. ESTUDILLO-AYALA²

Centro de Investigaciones en Óptica, Lomas del Bosque 115, Colonia Lomas del Campestre, 37150, León, Guanajuato, México
¹Facultad de Ciencias Físico Matemáticas, Universidad Autónoma de Nuevo León, Ciudad Universitaria, Nuevo León, 66450, México
²Departamento de Electrónica, Facultad de Ingeniería Mecánica Eléctrica y Electrónica, Universidad de Guanajuato, Apartado Postal 215-A, 36730 Salamanca, Guanajuato, México

(Received December 25, 2007; Accepted June 24, 2008)

We present an all-fiber Mach–Zehnder interferometer consisting of two consecutive fattened sections of dispersion-shifted fiber that act as in-series long period fiber gratings. The proposed Mach–Zehnder interferometer shows a broad fringe pattern ranging from 1000 to 1500 nm and is stable against changes in temperature and strain. By tapering a section of 5 mm in length to 50% diameter between the fattened sections we observe an increased sensitivity to temperature changes. The measured temperature and strain sensitivities were in the range of 9–17 pm/°C and 1.44–2.9 pm/με, respectively.

Key words: long-period grating, fattening, Mach–Zehnder, fiber devices, electric arc

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