| CPC G02B 6/02042 (2013.01) | 7 Claims |
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1. A multicore fiber comprising:
a plurality of first glass regions each including: a first core portion; and a first cladding portion having a lower refractive index than a maximum refractive index of the first core portion;
a second glass region including a second cladding portion surrounded by the plurality of first glass regions, the second cladding portion coming into contact with the first cladding portions of the plurality of first glass regions; and
a cladding region formed on outer peripheries of the plurality of first glass regions and the second glass region, wherein
in a stress distribution generated between the first core portions of the plurality of first glass regions that face each other across the second glass region, an average value of compressive stress in the first glass regions is smaller than an average value of compressive stress in the second glass region.
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