An optical fiber suitable for use in a single fiber or multifiber optical connector
or array is structured with a core region and a cladding region surrounding the
core region, and exhibits a bending loss of a fundamental mode of the fiber at
a wavelength is lower than 0.1 dB/m at a diameter of 15 mm, a mode-field
diameter of the fundamental mode at an end of the fiber at the wavelength
is between 8.0 m and 50 , and a bending loss of a first higher-order
mode at the wavelength is higher than 1 dB/m at a diameter of 30 mm. The
fiber may be multistructured, wherein the cladding region comprises a main medium
and a plurality of sub medium regions therein to form a spatially uniform average
refractive index.
