Abstract
Holey optical fibers (HFs) have attracted much attention because they exhibit an amount of unique optical properties such as single mode operation over a wide wavelength range, large structure chromatic dispersion, or numerous degrees of freedom in design.1,2 For HF made up of an all-silica optical fiber surrounded by microscopic air holes, an array of holes is necessary in order to concentrate light into a small area. Otherwise, fields will spread out to deteriorate some optical properties such as bend losses. On one hand, there is a hole-assisted type of holey fiber which has a conventional step index core surrounded by a few air holes.3 The loss of the fiber was actually low but the dispersion did not vary much from a standard step-index fiber.
© 2002 Optical Society of America
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