| 摘要 |
<P>PROBLEM TO BE SOLVED: To make the signal quality excellent in association with individual differences in extinction ratio due to production unevenness of a device. <P>SOLUTION: The signal quality of a differential 4 phases deviation modulated radiation outputted by the differential 4 phases deviation modulator is acquired, an average amplitude of a first or second driving voltage signal is adjusted in accordance with the signal quality of the acquired differential 4 phases deviation modulated radiation, and the average amplitude of the first or second driving voltage signal is adjusted. <P>COPYRIGHT: (C)2007,JPO&INPIT |
