We have theoretically and experimentally designed and demonstrated an all-fiber
polarization interference filter (AFPIF), which is formed by a polarization-maintaining
(PM) fiber cavity structure utilizing two 45° tilted fiber gratings
(45°-TFGs) inscribed by UV laser on the PM fiber. Such a filter could generate
modulated transmission of linear polarization status. It has been revealed that the
modulation depth of the transmission depends on the coupling angle between the
45°-TFGs and the PM fiber cavity. When the two 45°-TFGs in PM fiber
are oriented at 45° to the principal axis of the PM fiber cavity, the maximum
modulation depth is achievable. Due to the thermal effect on birefringence of the PM
fiber, the AFPIF can be tuned over a broad wavelength range just by simple thermal
tuning of the cavity. The experiment results show that the temperature tuning
sensitivity is proportional to the length ratio of the PM fiber cavity under heating.
For 18 and 40 cm long cavities with 6 cm part under heating, the thermal tuning
sensitivities are 0.616 and 0.31 nm/°C, respectively, which are almost two
orders of magnitude higher than normal fiber Bragg gratings.
© 2012 IEEE
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