| 摘要 |
<p>PROBLEM TO BE SOLVED: To secure a wide transmission band while suppressing an injection current to a wavelength converter in the case of converting the wavelength of multi signal light of an unequal interval wavelength into that of multiple signal light of an equal interval wavelength. SOLUTION: When unequal interval wavelength multiple signal light beams Ps1 to Ps4 (of wavelengthsλa toλ4) and pump signals Pa to Pd (of wavelengthsλa toλd) are inputted to a wavelength demultiplexer 102, the beams Ps1, Pa are outputted from a waveguide 103, the beams Ps2, Pb are outputted from a waveguide 104, the beams Ps3, Pc are outputted from a waveguide 105, and the beams Ps4, Pd are outputted from a waveguide 106. These outputted light beams are converted into converted signal light beams Po1 to Po4 (of wavelengthλa toλd) by respective wavelength converters 111 to 114. A multiplexer 115 multiplexes the converted signal light beams Po1 to Po4 and outputs a multiplexed beam. When exciting beams Pα, Pβ, Pχ, Pδare inputted to respective wavelength converters 111 to 114 through the multiplexer 115, a wide transmission band can be secured even when carrier density is increased and an injection current is reduced.</p> |
