Patent ID: 6864967

Claim:
An optical characteristic measuring apparatus for measuring characteristics of devices under test having a first optical transmission line letting light through in one direction only and a second optical transmission line letting light through only on a direction opposite to the aforementioned direction comprising: a variable wavelength light source for generating a variable wavelength light; a first light modulating mechanism for introducing into said first optical transmission line a first incident light obtained by modulating said variable wavelength light by a frequency of an electrical signal inputted; a first optical/electrical converting mechanism for converting by a first optical/electrical conversion process the first incident light having penetrated said first optical transmission line; a fixed wavelength light source for generating a fixed wavelength light; a signal source for generating a reference electrical signal; a second light modulating mechanism for injecting into said second optical transmission line a second incident light obtained by modulating said fixed wavelength light by a frequency of said reference electrical signal; and a second optical/electrical converting mechanism for converting by a second optical/electrical conversion process the second incident light having penetrated said second optical transmission line; and for outputting electrical signal onto said first light modulating mechanism.