The invention discloses a
photon crystal optical fiber, whose
transect includes a
fiber core and a cladding. The cladding is identical to the common
photon crystal optical fiber, and is a
peripheral area surrounding the
fiber core and homogeneously distributed with identical structural airports. The airports are periodically arranged in the
optical fiber base material, the dimension of the airports is the
wavelength magnitude, every three adjacent airport units constitute a regular triangle. The
fiber core is jointly constituted by an optical fiber base material locating at the center part of the optical fiber end-face and another
solid material, wherein, the refractivity of the
solid material is higher than that of the optical fiber base material, two blocks of
solid material are symmetric distributed at the both sides of the optical fiber end-face center and the
minimum distance of their outer margins should be smaller than 400nm in order to produce a narrow slit. The
transect of the solid high-index material may be circular, elliptical shape, square or oblong; the
diameter of the circular cross section, the
minor axis diameter of the elliptical cross-section, the edge length of the
square cross section, and the short edge length of the oblong cross section should be smaller than 400nm. By changing the fiber core structure of the
photon crystal optical fiber, the invention uses the narrow slit to limit the light to spread in the nano-
scale dimension low refractivity base material, thereby largely decreasing the effective model field area, and causing the
photon crystal optical fiber to have ultra-high non-
linearity and ultra-low limitation waste. The invention uses a simple and convenient manufacturing structure to resolve the problem in the prior
photon crystal optical fiber technique, which is be difficult to implement ultra-high non-linear.