| 摘要 |
Provided are: an RF signal generator 110 which generates and outputs an RF signal having a signal waveform in which the potential of the signal changes to be alternately positive and negative with respect to a reference potential; a semiconductor laser 140 which receives, at its one end, a drive current which is based on the signal output from the RF signal generator 110 ; and a rectifier 150 which receives the drive current at its one end which has a polar directivity opposite to that of the one end of the semiconductor laser 140 , with the other end of the semiconductor laser 140 and the other end of the rectifier 150 connected to a common potential.
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