Abstract
Fused fiber couplers were fabricated by controlling the coupler waist profile,
and the wavelength and the polarization dependences against the waist profile were
investigated experimentally. In case of the strongly fused coupler, the coupling is a
little stronger for the x-polarized light than the y-polarized light, and the
wavelength dependence increases with fusing more strongly in spite of the shorter
effective coupler length. In case of the weakly fused coupler having a dumbbell profile
with a narrow neck, the wavelength and the polarization dependences increase rapidly
with narrowing the neck, and the wavelength dependence and the coupling become much
larger for the y-polarized light. The wavelength dependence becomes smallest around a
dumbbell profile with the aspect ratio of 1.94.
© 2010 IEEE
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