Abstract
In this paper, the characterization of a thermally tunable fiber optic
filter is presented. It consists of two Sagnac interferometers (SIs)
connected in series. Each SI contains a high-birefringence fiber (HiBiFi)
segment with different length in the loop, which generates a reduction in
the bandwidth of the filter transmission peak. In a previous work, a filter
composed by two SIs with equal HiBiFi segments connected in series was
reported. An experimental bandwidth reduction of approximately 31%, compared
with a filter composed by a single SI was obtained. Using the configuration
proposed in the present work, a reduction of approximately 52% in the range
of 1533 to 1586 nm and a sensitivity of $-1.27 ~{\rm nm}/^{\circ}{\rm C}$ was obtained.
© 2009 IEEE
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