20 September 1999 Design and simulation of cascade long-period fiber gratings for flattening EDFA's gain
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Abstract
A scenario using cascade long-period fiber gratings to flatten the gain spectrum of the Erbium Doped Fiber Amplifier (EDFA) is presented. Long-period fiber grating can act as a kind of wavelength selective loss device, in which the guided mode is coupled with forward transmit cladding modes. Cladding mode resonance in long period fiber grating is analyzed and cladding mode fields are simplified by using coupled mode theory. The loss spectrum formula versus propagation constant and refractive index fluctuation is obtained. Four long-period fiber gratings based on standard single mode fiber are designed for the typical EDFA's gain spectrum by using more accurate transmission spectrum formula. The resulted fiber gratings chain is used to flatten the broadband gain spectrum. The computer simulation result is satisfying.
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Ruan Yu, Ruan Yu, Xiaofang Huang, Xiaofang Huang, Yi Jiang, Yi Jiang, Jiping Wang, Jiping Wang, } "Design and simulation of cascade long-period fiber gratings for flattening EDFA's gain", Proc. SPIE 3801, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications V, (20 September 1999); doi: 10.1117/12.363937; https://doi.org/10.1117/12.363937
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