| 摘要 |
PURPOSE:To realize a fact that a channel interval of an optical frequency multipleyed signal becomes constant without using optical waveguide parts. CONSTITUTION:A star coupler 15 contains plural 2X2 couplers and allows plural laser outputs to be subjected to optical frequency multiplexing, and sends out an optical frequency multiplexed signal. By an optical switch 16, arbitrary optical signal is selected from the 2X2 couplers in the star coupler 15, and the selected optical signal is converted to an electric signal by light receiving part 17. A frequency discriminator 18 outputs a frequency differential signal of a frequency of the converted electric signal and a reference frequency. A control part 20 controls a switch 25 so as to select laser driving circuits 11-14 correaponding to lasers 21-24 for outputting the optical signal selected by the light switch. |
