Abstract

Dispersion-shifted (DS) single-mode fibers are designed to have low dispersion and low attenuation in the 1550-nm wavelength region. To achieve this, these fibers require complex index profiles and may, therefore, exhibit characteristics that are different from those observed in unshifted fibers with generally simple index profiles.1 Although DS fibers are optimized for operation at 1550 nm, it is generally considered useful to have the 1300-nm wavelength region also available for transmission. We, therefore, studied the cutoff wavelength behavior of a DS fiber with triangular-index core and a higher-index ring surrounding the core.2 The results of the study show that for the bend diameter of 28 cm, used for specifying the cutoff wavelength of unshifted fibers as recommended by CCITT,3 the cutoff region of the DS fiber investigated exhibits an interesting hump which may impact on the definition of the cutoff wavelength of this fiber.

© 1988 Optical Society of America

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