Recently high channel-count fiber Bragg grating (FBG), as one of the fiber-based promising solutions to the broad-band chromatic dispersion compensation for the existing fiber link, has attracted great interests [1-9]. However, with an increasing number of WDM channels to cover the full C-band, high channel-count FBG devices become extremely difficult to realize due to the requirements of a considerably high index-modulation and the tremendous precision of the FBG writing tools. In this paper, a novel continuous phase-only sampling function is introduced, in which optimization for an 81-channel phase-only sampling function with excellent channel uniformity and high in-band energy efficiency is obtained by using the simulated annealing algorithm. Compared to the numerical results, an 81-channel (spacing 50 GHz) phase-only sampled linearly chirped FBG are successfully demonstrated.
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