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An investigation of macrobending loss characteristics of a standard singlemode fiber (SMF28) for small bend radii is presented theoretically and experimentally, which includes the bend loss of the SMF28 with coating layers and the bare SMF28 after stripping the coating layers and chemical etching of partial cladding. The significant influence of reflection occurring at the interface between the cladding and coating layer or the cladding layer and air on the bend loss is investigated theoretically and experimentally.
Wang, P., Wang, Q., Farrell, G., Freir, T., Cassidy, J.: Investigation of Macrobending Losses of Standard Single Mode Fiber with Small Bend Radii. Microwave and Optical Technology Letters, Vol. 49, No. 9, pp. 2133-2138, 2007.