Patent ID: 9136944
Filing Date: 2015-09-15
Classification: H04B

Abstract:
1. A measurement device, comprising: a first obtaining unit configured to obtain a first power ratio that indicates a ratio of optical signal power of a first wavelength in a first spectrum at a reception device to optical signal power of a second wavelength different from the first wavelength in the first spectrum; a second obtaining unit configured to obtain a second power ratio that indicates a ratio of optical signal power of the first wavelength in a second spectrum at a transmission device to optical signal power of the second wavelength in the second spectrum; a calculation unit configured to calculate an optical signal-to-noise ratio (“OSNR”) of the optical signal at the reception device using the first power ratio obtained by the first obtaining unit and the second power ratio obtained by the second obtaining unit; an output unit configured to output the OSNR calculated by the calculation unit; and a setting unit configured to set the first wavelength and the second wavelength based on first spectrum information on the first spectrum and second spectrum information on the second spectrum by performing wavelength shifting on at least one of the first spectrum and the second spectrum in a direction in which a deviation between a wavelength in which power is maximum in the first spectrum and a wavelength in which the power is maximum in the second spectrum is minimized.