| 摘要 |
PURPOSE:To separate wavelength-multiplexed optical signal at every one wavelength by current control from the outside by selecting only an optical signal having a wavelength coinciding with the amplification wavelength of an amplifier A in beams projected to a semiconductor laser amplifier (group) by semiconductor laser amplifiers. CONSTITUTION:At least two distributed feedback type semiconductor amplifier groups having diffraction gratings having different Bragg frequency and optically connected in series are provided. g=alphao is selected to an amplifier 21, g=0.9gth to an amplifier 22 and g=alphao to amplifiers 23-25. Consequently, only lambda2 is amplified, and outputted. When wavelength intervals are selected in 10Angstrom , the semiconductor laser amplifiers have a gain wavelength of approximately 200Angstrom , and waves can be branched to approximately twenty waves. When incident bears are divided previously, beams can be branched according to wavelengths to each waveguide by the selective amplification of wavelengths, and have an amplification factor of approximately one hundred times, thus sufficiently supplementing optical loss by division of approximately twenty division.
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