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  • Title: Phase-controlled superimposed FBGs and their applications in spectral-phase en/decoding.
    Author: Zheng J, Wang R, Pu T, Lu L, Fang T, Su Y, Li L, Chen X.
    Journal: Opt Express; 2011 Apr 25; 19(9):8580-95. PubMed ID: 21643109.
    Abstract:
    A novel kind of superimposed fiber Bragg gratings (SI-FBGs) named SI-sampled FBGs (SI-SFBGs) is proposed to control the phase relationship among SI sub-gratings by modulating the sampling periods. The realization of such phase-controlled SI-SFBGs just needs a single uniform phase mask and sub-micrometer precision moving stage. The success of phase-controll is expected to encourage SI-SFBGs' applications in more sophisticated fields. As a demonstration, their applications in spectral-phase en/decoding are testified by both simulation and experiment. The spectral-phase encoded (SPE) encoders with the longest code-length that FBG-based SPE encoders can achieve, i.e., 64-frequency bins, are experimentally fabricated for the first time. The results show the advantages accompanying the SI-SFBGs-based SPE encoders compared with the traditional methods.
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