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Opt Lett. 2009 Apr 1;34(7):1045-7.

Long-period-fiber-grating-based filter configuration enabling arbitrary linear filtering characteristics.

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Institute of Photonics and Electronics AS CR, Prague, Czech Republic.


The filtering scheme proposed here is based on transmission through a dual long-period-fiber-grating (LPFG) configuration and enables implementation of arbitrary spectral transfer functions using available inverse-scattering design algorithms, such as those widely used for fiber Bragg gratings (FBGs) operating in reflection. Besides the important technical advantage of operation in transmission, the proposed device can reach large spectral bandwidths that would be extremely challenging to reach by, e.g., FBG devices. The proposed concept is demonstrated by designing and fabricating a LPFG-based filter for synthesis of transform-limited 1.5-ps-long square-like pulses.

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