| 摘要 |
In a graded index optical fiber whose refractive index distribution (n) at the radial length r is given by <IMAGE> where (n0) is the refractive index at the core axis, (a) is the core radius, alpha is a power exponent, ne is the refractive index of the cladding, and DELTA =(n0-ne)/n0, said exponent alpha and the normalized frequency v (=(2 pi an0/ lambda ) 2ROOT 2 DELTA , lambda is the wavelength) are determined so that the group delay of the fundamental mode is equal to that of the first higher order mode. In particular, the value of alpha is determined in the range 3.2</= alpha </=6.0. Thus, the optical fiber with both a broad bandwidth and a large core diameter can be provided. A large core diameter optical fiber facilitates the connection or the splicing of two optical fibers.
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