QUARTZ SYSTEM OPTICAL FIBER

申请公布号：

JPH03229223(A)

申请号：

JP19900024154

申请日期：

1990.02.02

申请公布日期：

1991.10.11

申请人：

FURUKAWA ELECTRIC CO LTD:THE

发明人：

IINO AKIRA

分类号：

G02B6/00;G02B6/036;G02F1/35;H01S3/06;H01S3/07

主分类号：

G02B6/00

摘要：

PURPOSE:To make a mode field diameter large by providing >=1 outer core which has a lower refractive index than a center core and a clad which has a lower refractive index than the outer core, and incorporating erbium in the center core. CONSTITUTION:More than one outer core 12 which has the lower refractive index than the center core 11 and the clad 13 which has the lower refractive index than the outer core 12 are provided and erbium is incorporated in the center core 11. Thus, not only the center core, but the outer core are provided. Consequently, the mode field having the large diameter is secured to decrease the center core diameter and the erbium is doped in the small-diameter center core to improve light emission efficiency.