| 摘要 |
In the three-terminal optical signal amplifying device 10, a portion of the neighboring light L<SUB>S </SUB>at other wavelength than that of the first wavelength lambda<SUB>1 </SUB>that is selected from the output light from the element 14 by the optical add drop filter 16, and the control light L<SUB>C </SUB>at the second wavelength lambda<SUB>2 </SUB>input from the external are together input to the second semiconductor optical amplifying element 18. The output light including the output signal light L<SUB>OUT </SUB>at the second wavelength lambda<SUB>2 </SUB>and the neighboring light at the neighboring wavelength to the second wavelength lambda<SUB>2 </SUB>that is modulated and controlled by the control light L<SUB>C </SUB>in the cross gain modulation is output from the second semiconductor optical amplifying element 18. And the output signal light L<SUB>OUT </SUB>at the second wavelength lambda<SUB>2 </SUB>passes through the wavelength selecting filter 20.
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