Patent ID: 7130031
Filing Date: 2006-10-31
Classification: G01M,G01N

Abstract:
1. An optical characteristic measuring apparatus for measuring characteristics of devices under test having a first optical transmission line letting light through only in a first direction and a second optical transmission line letting light through only in a second direction opposite to said first direction, said apparatus comprising: a first variable wavelength light source for generating a first variable wavelength light; a first light modulating element for introducing into said first optical transmission line a first incident light obtained by modulating said first variable wavelength light with a frequency of a first electrical signal, wherein said first incident light exits from said first optical transmission line as a first outgoing light; a first optical/electrical converting element for converting by a first optical/electrical conversion process, the first outgoing light into a second electrical signal; a second variable wavelength light source for generating a second variable wavelength light; a signal source for generating a reference electrical signal; a second light modulating element for introducing into the second optical transmission line a second incident light obtained by modulating said second variable wavelength light with said reference electrical signal, wherein said second incident light exits from said second optical transmission line as a second outgoing light; a second optical/electrical converting element for converting, by a second optical/electrical conversion process, the second outgoing light into the first electrical signal and for outputting the first electrical signal into said first light modulating element; and a third optical/electrical converting element for converting, by a third optical/electrical conversion process, a reflected light, which is generated when said second light modulating element introduces said second incident light into said second optical transmission line, into a third electrical signal.