Abstract
In this paper, a method based on the glass structure change
is proposed to make fused fiber couplers wavelength insensitive. After fused
fiber couplers are fabricated, the coupling regions are heated unequally by
arc discharge. The glass structure change induced by arc discharge generates
unbalance index changes in the two identical fibers constituting the fused
fiber couplers, and brings about the phase mismatch between the fibers. The
phase mismatch results in the wavelength-insensitive response. The proposed
method was applied to wavelength-flattening fused fiber couplers with different
cross-sectional shapes, and it has become clear that the method is effective
for the reduction of the wavelength dependence.
© 2008 IEEE
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