Optically tunable long period fiber gratings utilizing a photochromic out-cladding overlayer

Results are presented on the all-optical tuning of the attenuation bands of an optical fiber long period grating utilizing a photochromic out-cladding overlayer. The out-cladding overlayer consists of PMMA polymer doped with the photochromic molecule of spiropyran. The spectral transmission characteristics of the long period grating are reversibly altered using sequential exposures of 355 nm and 532 nm, Nd:YAG laser radiation. The spectra recorded refer to long period grating notch shifts and extinction ratio modification of 1.2 nm and 0.5 dB, respectively.

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