Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 22, Issue 5, Pages 1358-1366Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2004.825357
Keywords
coupled-mode theory; fiber gratings; long-period fiber gratings (LPFGs); optical couplers; optical filters
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A wavelength-selective coupler constructed with two parallel identical uniform long-period fiber gratings (LPFGs) is analyzed by the coupled-mode theory. The effects of introducing a longitudinal offset distance between the two gratings on the transmission characteristics of the coupler are discussed and the conditions for achieving a 100% coupling efficiency are highlighted. It is found that 100% coupling can be achieved with a practical grating length by using a proper grating design and a suitable index-matching surrounding medium. The theoretical results agree well with the experimental data.
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