Abstract
An all-fiber comb-filter using a Mach–Zehnder interferometer based on
concatenated tapers is presented. The central wavelength, the amplitude, the period, and
the spectral width of the transmission interference pattern can be tailored by varying
the diameter and length of the waist, the length of the up- and down-transition of the
fiber tapers, and the separation between the two tapers. Depending on the geometrical
parameters of the tapers, the central position and span of the spectral interference
pattern were tailored in the range of 1200–1650 and 50–300 nm, respectively. By varying
the interferometer length, the fringe period and bandwidth were tailored between 3–36
and 2.5–11 nm, respectively. The physical length of the devices fabricated ranges from
15 to 30 mm. The proposed device is simple and suitable for applications in optical
communications systems, fiber lasers, and optical fiber sensors for the monitoring of
strain and displacement.
© 2012 IEEE
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