Low-loss many-to-one fiber couplers with few- or single-moded inputs and a multi-mode output

Chapman, David A. (2004). Low-loss many-to-one fiber couplers with few- or single-moded inputs and a multi-mode output. Fiber and Integrated Optics, 23(5) pp. 375–385.

DOI: https://doi.org/10.1080/01468030490489572

Abstract

The coupling of light from a number of few or single-moded fibers into a single multi-mode fiber is analyzed using geometric optics, and simple results demonstrating mode conservation are derived. Coupling from multiple single-mode fibers into a multi-mode fiber is investigated in detail using the overlap integral to determine coupling into each mode of the output fiber as a function of the light phase in the inputs. As well as results with practical relevance to fiber tapped delay-line filters and optical CDMA, the analysis provides pedagogic insight into light propagation and the light-gathering properties of fiber.

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