title: Highly efficient all-fiber tunable polarization filter using torsional acoustic wave.
abstract: We demonstrate an all-fiber tunable polarization filter with high coupling efficiency based on acousto-optic coupling between two optical polarization modes of the LP(01) mode propagating in a highly birefringent single mode optical fiber. An over-coupling between the two polarization modes is realized over the wavelength range from 1530 nm to 1610 nm using traveling torsional acoustic wave. The measured 3-dB optical bandwidth of the filter was 4.8 nm at the wavelength around 1550 nm. The details of the filter transmission and the coupling characteristics are discussed.
authors: Kwang Jo
authors: KJ
authors: Lee
authors: Hyun Chul
authors: HC
authors: Park
authors: Byoung Yoon
authors: BY
authors: Kim