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Proceedings Paper

Double- And Triple-Clad Fibers With Low Loss And Dispersion
Author(s): Hans-Georg Unger; Risheng Yang
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Paper Abstract

Single mode fibers with an inner cladding of depressed index can be designed to have low absorption, scattering and splicing loss. Dual-shape core fibers with a depressed-index inner cladding maintain these desirable features and in addition can be insensitive with respect to macro- and microbending while allowing wider tolerances for critical design parameters. triple-clad fibers can be produced economically with an inner cladding of only a few MCVD layers and a one-layer intermediate cladding of depressed index which prevents outer cladding loss to add to the transmission loss and, despite a large mode size for low splicing loss, renders this fiber insensitive with respect to micro- and macrobending. Such triple-clad fibers can also be designed to have zeroes of the dispersion coefficient at two or even three wavelengths. The core-index for these dispersion-flattened fibers is only 0.25% larger and the index of the intermediate cladding only 0.2% smaller than the index of the inner and outer cladding. The core radius needs to stay only within ±2.5% and the core index difference only within ±5% of the design values, for the dispersion coefficient to deviate less than 3.5 ps/(nm km) from its flattened characteristic.

Paper Details

Date Published: 30 January 1990
PDF: 11 pages
Proc. SPIE 1085, Optical Fibres and Their Applications V, (30 January 1990); doi: 10.1117/12.952937
Show Author Affiliations
Hans-Georg Unger, Technische Universitat Braunschweig (Germany)
Risheng Yang, Technische Universitat Braunschweig (Germany)


Published in SPIE Proceedings Vol. 1085:
Optical Fibres and Their Applications V

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