Journal
OPTICS LETTERS
Volume 36, Issue 18, Pages 3596-3598Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.36.003596
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We present a method for ultra-low-loss coupling between two single-mode optical fibers with different mode-field diameters using multimode interference in a graded-index multimode optical fiber. We perform a detailed analysis of the interference effects and show that the graded-index fiber can also be used as a beam expander or condenser. The results are important for devices in which optical fibers with different mode-field diameters are coupled in series, such as in ultra-short-pulse fiber ring lasers, or in optical fiber communication links. (C) 2011 Optical Society of America
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