| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and an apparatus for evaluating and selecting an optical modulation element, which can perform accurate evaluation and selection of the optical modulation element easily and quickly.SOLUTION: The method of the present invention, in first evaluation of the semiconductor optical modulation element, includes a step of: measuring output optical power and monitor current of the semiconductor optical modulation element for a voltage applied to a phase adjustment part, and obtaining and storing applied voltage-output optical power characteristics and first applied voltage-monitor current characteristics. In second evaluation of the semiconductor optical modulation element and thereafter, the method further includes the steps of: measuring the monitor current and obtaining second applied voltage-monitor current characteristics; obtaining a rate of change in the monitor current on the basis of the second applied voltage-monitor current characteristics for the first applied voltage-monitor current characteristics; and selecting a semiconductor optical modulation element having a rate of change satisfying a predetermined selection standard. |
