Fabrication of low dispersion single-mode fibers over a wide spectral range

Abstract

A new type of doubly clad single-mode fiber has been fabricated through the MCVD process, Design criteria with due regard to fabrication conditions that optimize fiber structure have also been investigated. As a result of determination of these criteria, a dispersion-minimized single-mode fiber with an index difference between core and outer cladding Δ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</inf> equal to 0.52 percent, an index difference between outer and inner cladding Δ <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> equal to -0.31 percent, a core diameter <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2a = 13.2 \mu</tex> m, and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">t/a = 0.51</tex> has been fabricated. The absolute value of the total dispersion of the fiber has been reduced to within ± 1 ps/km/nm in the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1.32-1.43 \mu</tex> m spectral range.