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Opt Lett. 2012 Feb 1;37(3):353-5. doi: 10.1364/OL.37.000353.

All-fiber polarization interference filters based on 45°-tilted fiber gratings.

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Photonics Research Group, Aston University, Birmingham, UK.


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.

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