Patent ID: 7948615

Claim:
A non-destructive method for characterizing, by a measurement device comprising an optical measurement probe, an integrated optical coupler of surface-illuminated ( 51 ), diffraction grating type, and introducing light into an optical waveguide ( 53 ), comprising the steps of: performing, by the optical measurement probe, a first measurement of the reflection coefficient (R 1 ), as a function of the wavelength, on a first region of the coupler located at a distance from the optical waveguide, to construct a first curve ( 61 ); determining, by the measurement device, a first model of the reflection coefficient (R 1 ), as a function of the wavelength, on the first region, the first model depending on first parameters (r 0 , k′ z,p , k″ z,p , k′ z,z1 ), and performing a first parameter fitting between the first curve and the first model to determine the first parameters; performing, by the optical measurement probe, a second measurement of the reflection coefficient (R 2 ), as a function of the wavelength, on a second region of the coupler sufficiently close to the optical waveguide for a portion of the incident light beam to be introduced into the optical waveguide, to construct a second curve ( 71 ); determining, by the measurement device, a second model of the reflection coefficient (R 2 ), as a function of the wavelength, on the second region, the second model depending on the first parameters and on second parameters (a, b, c), and performing a second parameter fitting between the second curve and the second model to determine the second parameters; and constructing, by the measurement device, the characteristic of the coupling efficiency (η g ) of the optical coupler as a function of the wavelength by using the first and second parameters.