摘要 |
The object of the present invention is to provide an apparatus that can perform measurement of chromatic dispersion, even if the wavelength "or" variable-wavelength light source and that of fixed-wavelength light source f or reference are identical with each other. The variable-wavelength light generated by a variable-wavelength light source 12 is subjected to intensity modulation to a frequency f by a first optical modulator 15a and transmitted from one end 30a to the other end 30b of an optical fiber 30. The fixed-wavelength light generated by a fixed-wavelength light source 14 is subjected to intensity modulation to a frequency f by a second optical modulator 15b and transmitted from the other end 30b to the one end 30a of optical fiber 30. Therefore, it is possible to separately obtain the variable- wavelength light and fixed-wavelength light transmitted through the optical fiber 30 using a second directional coupler 28 and a first directional coupler 26, respectively, regardless of wavelengths thereof. Accordingly, it is also possible to perform the comparison of phase and measurement of chromatic dispersion, eve n if the wavelengths of variable-wavelength light source and fixed-wavelength light source for reference are identical with each other.
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