Patent ID: 9175946
Filing Date: 2015-11-03
Classification: G01B,G01N

Abstract:
1. A manufacturing method of a holey optical fiber, comprising: manufacturing a holey optical fiber by melting and drawing an optical fiber preform formed with holes; and measuring a hole diameter of the holey optical fiber by using a hole diameter-measuring method, the hole diameter-measuring method comprising: preparing first holey optical fibers with different first hole diameters; obtaining first arithmetical mean values as a result of calculating a first arithmetical mean value I(x obtaining first mode field diameters, each of which is defined by a first mode field diameter 2W(x 2W(x I(x k: a constant expressed by the following formula; 2W(x 2W(x I(x I(x obtaining the first hole diameters of the first holey optical fibers, the first hole diameters being actually measured using an offline measurement method; drawing a graph by obtaining datapoints, each of which is defined by each of the obtained first mode field diameters and each of the obtained first hole diameters; acquiring a relational expression (5) between the obtained first mode field diameters and the obtained first hole diameters as a result s of approximating the datapoints by a linear function; d: a hole diameter; a a preparing a second holey optical fiber which is different from the first holey optical fibers; calculating a second arithmetical mean value I(x obtaining a second mode field diameter 2W(x obtaining a second hole diameter at the position x