Staas & Halsey LLP
Wavelength dispersion measurement apparatus and a method thereof
 A signal light from a variable wavelength light source and an excitation light from a variable wavelength light source are input to a fiber to be measured. At least either of the signal and the excitation lights is assigned a high power level such that a 4-wave mixing phenomenon is caused within the fiber to be measured. In this way, an FWM light occurs within the fiber to be measured. On a receiving side, the power levels of the FWM and the signal lights are measured, and the generation efficiency of the FWM light is calculated. Since the generation efficiency of the FWM light depends on the dispersion value of the fiber to be measured, the dispersion value is obtained from the generation efficiency of the FWM light by using this dependency. The measurement may be manually made by an operator, or be automatically made. 
Fujitsu Limited
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G01M G01M G01M
inventional inventional inventional
Yasuo
Suzuki