| 摘要 |
PROBLEM TO BE SOLVED: To highly accurately control an oscillation wavelength in simple circuit constitution. SOLUTION: A transmission part 1 is provided with a single wavelength light source part 90 provided with a plurality of unit circuits for inputting a plurality of optical signals 3 and outputting a plurality of the optical signals of different wavelengths, an optical multiplex part 106 for inputting a plurality of the optical signals outputted from the single wavelength light source part 90 and outputting a plurality of the inputted optical signals as one wavelength multiplexed optical signal 4 by multiplex, an inspection signal extraction means 105 for extracting a part of a plurality of the optical signals outputted from the single wavelength light source part 90 and inputting the extracted signal as an inspection signal 7 to the optical multiplex part 106 and operation control means 108 and 109 for detecting the inspection signal 7 inputted to the optical multiplex part 106, discriminating the state of the detected inspection signal 7 and outputting control signals for controlling the operation of the single wavelength light source part 90. |
