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专利名称：Wavelength dependence correction method
in optical variable attenuator
发明人：Yoshinori Matsumoto,Hiroyuki Sugimura申请号：US09/043687申请日：19980326公开号：US06144793A公开日：20001107
摘要：The present invention provides a wavelength dependent compensation methodin a variable optical attenuator which can precisely set the amount of attenuation within awide range of wavelengths, and to provide superior operability. An optical signal 20a isemitted from a white light source 20 incident on a monochromator 21, and under controlof a CPU 24, only an optical signal 20b of a specific wavelength is extracted and is madeincident on a variable optical attenuator 22; in optical attenuator 22 under control of aCPU 24, optical signal 20b is attenuated; the power of attenuated optical signal 20c ismeasured by power measurer 23 under control of a CPU 24, producing compensatingdata; and using the pulse number corresponding to the rotation angle of the motorwhich activates the variable optical attenuator 22 according to this compensating data,the position of variable optical attenuator 22 is compensated to attain the desiredamount of attenuation.
申请人：ANDO ELECTRIC CO., LTD.
代理机构：Fish & Richardson P
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