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Transmission analysis of long-period fiber grating with trapezoid index modulation

Wang G. D., Liu C. X., Sun D. M., Guo W. B., Chen W. Y.

Optica Applicata

2006

Vol. 36, nr 1

69-78

The long-period fiber grating (LPG) with trapezoid index modulation is presented as a novel grating. The influence of the difference between the top width and the bottom width (simplified to d in the following text) of the trapezoid index modulation on the transmission characteristics is analyzed. Calculated results show that the resonance location displaces to the long wavelength when the d increases. Compared with the long-period fiber grating with rectangle index modulation, the advantage of this novel grating is that it needs a smaller refractive index change. When d is zero, this model can be used to simulate the LPG with a rectangular index modulation, and the theoretical results are in good agreement with the experimental ones.