| 摘要 |
An apparatus including a variable wavelength light source for generating a variable wavelength light, a first light modulator for inputting into a first optical fiber transmission line a first incident light obtained by modulating the variable wavelength light by a frequency of an electrical signal inputted, a first converter for converting the first incident light, a fixed wavelength light source for generating a fixed wavelength light, a signal source for generating a reference electrical signal, a second light modulator for inputting in a second optical fiber transmission line a second incident light obtained by modulating the fixed wavelength light by a frequency of the reference electrical signal and a second converter for converting the second incident light and for outputting the electrical signal into the first light modulator.
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