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25 October 2004 Optimization of index modulation profile of sampling period for sampled fiber Bragg gratings
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Using the simple inverse Flourier transformation of the target channels, we can get the index modulation structure of the sampled period for the sampled fiber Bragg gratins (FBGs). In this method, the enable channels are identical wavelength operation while the unable channels are almost suppressed completely, and the enable and unable channels can be established at will based on the applications. However, the efficient of the sampled FBGs of which the index modulation is obtained by the simple inverse Fourier transformation is very slow. To get a high efficient, a particle swarm optimization algorithm is applied to design the phase of the target spectrum. Combing the two methods together, a high efficient multi-level phase sampled FBG that each channel is suppressed or not at will, can be obtained. We also use the particle swarms optimizations (PSO) algorithm to optimize the pure phase sampling profiles of the sampled FGB. Results showed that a much high efficient of the FBG can be obtained compared with that obtained from the simple inverse Fourier transformation technology. If appropriate grating period chirp and sampled period chirp is applied to such a grating, a novel FBGs based OADM or interleaver devices with dispersion or dispersion slope compensation can be designed.
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Yumin Liu, Zhongyuan Yu, Hongbo Yang, and Na Zhang "Optimization of index modulation profile of sampling period for sampled fiber Bragg gratings", Proc. SPIE 5595, Active and Passive Optical Components for WDM Communications IV, (25 October 2004);

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