Optical spectrum analyzer and spectrometer
 A first invention of the present application is an optical spectrum analyzer comprising a spectrometer apparatus an arithmetic unit for calculating the center wavelength from output signals from photo detector devices of a device array included in the spectrometer apparatus 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 detector devices 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 device 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 detector devices and from the values obtained by actual measurements. 
Yokogawa Electric Corporation
G
G01J
inventional
Yoshihiro Yasuyuki Mamoru Yoshihiko
Sampei Suzuki Arihara Tachikawa