All-fiber polarization interference filters based on 45°-tilted fiber gratings.
We report all-fiber polarization interference filters, known as Lyot and Lyot-Őhman filters, based on alternative concatenation of UV-inscribed fiber gratings with structure tilted at 45° and polarization maintaining (PM) fiber cavities. Such filters generate comb-like transmission of linear polarization output. The free spectral range (FSR) of a single-stage (Lyot) filter is PM fiber cavity length dependent, as a 20 cm long cavity showed a 26.6 nm FSR while the 40 cm one exhibited a 14.8 nm FSR. Furthermore, we have theoretically and experimentally demonstrated all-fiber 2-stage and 3-stage Lyot-Őhman filters, giving more freedom in tailoring the transmission characteristics.
Photonics Research Group, Aston University, Birmingham, UK. yanz1@aston.ac.uk
Zhijun
Z
Yan
Chengbo
C
Mou
Hushan
H
Wang
Kaiming
K
Zhou
Yishan
Y
Wang
Wei
W
Zhao
Lin
L
Zhang