Abstract
We present both theoretically and experimentally the thermo-optic characteristics of
micro-structured optical fiber (MOF) filled with mixed liquid. The performance of MOF depends on the
efficient interaction between the fundamental mode of the transmitted light wave and the tunable
thermo-optic materials in the cladding. The numerical simulation indicates that the confinement loss
of MOF presents higher temperature dependence with higher air-filling ratios
<i>d/Λ</i>, longer incident wavelength and fewer air holes in the
cladding. For the 4cm liquid-filled grapefruit MOF, we demonstrate from experiments that different
proportions of solutions lead to tunable temperature sensitive ranges. The insertion loss and the
extinction ratio are 3~4 dB and approximate 20 dB, respectively. The proposed liquid-filling MOF
will be developed as thermo-optic sensor, attenuator or optical switch with the advantages of simple
structure, compact configuration and easy fabrication.
© 2013 Optical Society of Korea
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