Synthesis method based on genetic algorithm for designing EDFA gain flattening LPFGs having phase-shifted effect |
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Authors: | Hoonki Kim Jinho Bae Joohwan Chun |
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Affiliation: | 1. Yong-in Songdam College, 571-1 Mapyung-dong, Cheoin-gu, Yongin-si, Gyeonggi-do 449-710, South Korea;2. College of Ocean Science, Cheju National University, 66 Jejudaehakro, Jeju-si, Jeju-do 690-756, South Korea;3. Scientific Computing Laboratory, Dept. of EECS, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, South Korea |
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Abstract: | We propose a new synthesis method based on the genetic algorithm for the design of erbium-doped fiber amplifier gain flattening filters. Our genetic algorithm iterates starting with the long period fiber gratings structure constructed by inserting the phase-shifted long period fiber gratings in the middle of the structure, for the more accurately matched spectrum to the desired erbium-doped fiber amplifier gain flattening filter. To verify a synthesizing technique using the proposed algorithm, we have synthesized the long period fiber gratings structures according to the inverted gain spectrum of a commercially available erbium-doped fiber amplifier over the entire 1525–1570 nm range, theoretically. We have also obtained the synthesized structure was more accurate than the structure without phase-shifted section. |
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