Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 30, Issue 14, Pages 2240-2245Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2012.2193872
Keywords
Modal dispersion; multi-mode fiber; optical fiber communication; optical fiber modes; spatial multiplexing
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We examine wave propagation in few-mode and multimode fibers with a small index difference between core and cladding, where linearly polarized (LP) modes serve as a highly useful simplified solution. However, for a nonzero index difference, each LP mode decomposes into two true fiber waveguide modes, typically an HE and an EH mode. These two constituent modes have different group delays, which results in an effect termed modal birefringence. This effect needs to be understood in the design of mode-multiplexed transmission systems. We report an analysis of modal birefringence including scaling rules for fiber design, and provide numerical results for about 50 of the lower order modes.
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