| 摘要 |
PROBLEM TO BE SOLVED: To provide a spectrum measurement device and a measuring method thereof that enable a spectral line width to be measured with good reproducibility without requiring particular adjustment even if fluctuations occur in a polarization plane of a laser beam when light made incident passes through a delay optical fiber in the spectrum measurement device.SOLUTION: There is provided a spectrum measurement system for measuring a spectral line width from results of spectrum analysis of beat signals. In the spectrum measurement system, a polarization scrambler for randomizing polarization conditions of a passing-through laser beam is connected between an output side of a delay optical fiber and an input side of an optical directional coupler. |
