Patent ID: 9448358
Filing Date: 2016-09-20
CPC Classification: G02B

Claim Text:
1. A multicore optical fiber, comprising: a plurality of cores; and a sea portion formed around each core, wherein the multicore optical fiber satisfies at least condition (1) and (2) below: (Condition 1): an occupancy rate of a total cross-sectional area of cores is in the range of 80 to 95% of an outer region in a cross section of a multicore optical fiber; and (Condition 2): the occupancy rate of the total cross-sectional area of cores is in the range of 82 to 93% of the cross section of a multicore optical fiber, and wherein the outer region is a region sandwiched between a periphery of the multicore optical fiber and a periphery of a concentric circle that is formed at a center of the multicore optical fiber having a substantially circular cross section and has a diameter that is 60% of a fiber diameter.