Effects of Grating Period and Mode Order on the Growth and Sensitivity of the Resonant Peaks of Long Period Gratings

Saeed PILEVAR  Trevor W. MACDOUGALL  Christopher C. DAVIS  

IEICE TRANSACTIONS on Electronics   Vol.E83-C    No.3    pp.448-453
Publication Date: 2000/03/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Fiber Sensors)
Category: Passive and Active Devices for Photonic Sensing
fiber Bragg gratings,  long period gratings,  mode coupling,  device characterization,  

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A general analytical expression for describing the growth of the resonant peak wavelengths of long period gratings is derived. The theoretical calculations explain the shift of peak loss wavelengths in the direction of either shorter or longer wavelengths as the induced index change of grating increases. We have calculated and experimentally verified the sensitivity of the resonant peak wavelengths with respect to an overlay index for various grating periods. It is shown that the center wavelength shift of the claddding modes depends strongly on the grating period and the claddding mode order.