| 摘要 |
A first invention of the present application is an optical spectrum analyzer comprising a spectrometer, an arithmetic unit for calculating the center wavelength from output signals from photo detectors of a device array included in the spectrometer and from the light power distribution at an incident port by interpolation and for calculating the total power, and a display unit for displaying values of the center wavelength and total power. The dispersing device directs light introduced from the incident port at the dispersing device. Light going out of the dispersing device is focused onto the device array. In this structure, the outputs (theoretical values) from the photo detectors are calculated. Where the n-th device of the device array producing a maximum output deviates from the center of the outgoing beam impinging on the device array by an amount of DELTA x, the relation between the deviation DELTA x and the associated photo detector is found in advance. If values are obtained by actual measurements, DELTA x is found from the above relation. Then, the center wavelength is found. Also, the total power can be calculated from the theoretical values of the outputs from the photo detectors and from the values obtained by actual measurements. <IMAGE> |
