Patent ID: 9562827
Date: 2017-02-07
CPC Classifications: G01M

Claim:
1. A measuring method of a longitudinal distribution of bending loss of an optical fiber, the method comprising: conducting a bidirectional OTDR measurement of the optical fiber in a longitudinal direction of the optical fiber; calculating an arithmetical mean value I(λ, x) from two backscattering light intensities of two backscattering lights at a position x obtained by the bidirectional OTDR measurement of the optical fiber; obtaining a mode field diameter 2W(λ, x) and a relative refractive index difference Δ(x) between a core and a clad of the optical fiber at the position x and a wavelength λ, using the arithmetical mean value I(λ, x), formula (2), formula (3), and formula (4): and obtaining a bending loss value at the position x based on the mode field diameter 2W(λ, x) and the relative refractive index difference Δ(x) at the position x.