| 摘要 |
PROBLEM TO BE SOLVED: To widen the effective area of operating wavelength windows respectively near 1300nm and 1550nm. SOLUTION: This fiber consists of a core region which has a center line and radius along the longitudinal axis of the fiber and a refractive index reflection distribution and max. refractive index and a clad layer which encloses this core region and has the refractive index reflection distribution and max. refractive index nC. In such a case, at least part of the refractive index distribution of the core region has the refractive index larger than nC. The core region is characterized by the max. refractive index which is apart from the center line, the min. point of the refractive index distribution which exists near the center line and the central line which is the symmetrical axis of the refractive index distribution. |
