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Narrow-bandwidth all-fiber acoustooptic tunable filter with low polarization-sensitivity

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5 Author(s)
Dong Il Yeom ; Dept. of Phys., Korea Adv. Inst. of Sci. & Technol., Daejeon, South Korea ; Hyo Sang Kim ; Myeong Soo Kang ; Hee Su Park
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We demonstrate a narrow-bandwidth acoustooptic tunable filter with very low polarization-sensitivity using a dispersion-compensating fiber that has a large group index difference between the core and the cladding modes with a specific stress distribution. The 3-dB bandwidth of the filter is 0.8 nm with the interaction length of 10 cm, and the polarization-dependent center-wavelength splitting is 0.04 nm at the wavelength around 1550 nm. The origin of the low polarization-dependence is successfully explained through the analysis on the stress field in the fiber.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 12 )