| 摘要 |
PROBLEM TO BE SOLVED: To resolve the problem that the number of semiconductor lasers must be reduced in accordance with the increase of optical signals because the number of optical signals to be converted to electric signals on the semiconductor LSI is considerably increased in accordance with the increase in capacity of an output interface of an electronic circuit and the reliability of semiconductor lasers for use as optical signal generation means is lower than that of a semiconductor LSI. SOLUTION: An optical signal source has a configuration of modulating continuous light from a semiconductor laser by an external optical modulator to generate signals, instead of a configuration of directly modulating a current of the semiconductor laser. The continuous light from the semiconductor laser is branched, and signals are generated from respective continuous light beams by the external optical modulator. For example, when the continuous light is branched into 8, the number of semiconductor lasers is reduced to 1/8, and the reliability is enhanced. COPYRIGHT: (C)2008,JPO&INPIT
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