| 摘要 |
PROBLEM TO BE SOLVED: To use a transmitter which is designed to operate in a certain signal band also in another signal band by combining an outputted optical signal with a generated optical signal and transmitting the generated optical signal, having a wavelength included in the 2nd band width and corresponding to the wavelength of an optical signal included in the 1st band width to an optical transmission path. SOLUTION: A coupler 15 combines the output of a laser pump 10 with an input synthesized signal, which is produced from an optical signal included in a 1st band and sends the resultant signal to an optical amplifier 20. The amplifier 20 amplifies the signals, which are combined together by a prescribed amplification coefficient and sends the amplified signals to a wavelength converter 25. The converter 25 outputs an optical signal of a 1st band, a corresponding signal of a 2nd band and a laser pumping signal. An optical signal filter 30 transmits the signals, outputs the optical signal in the 2nd band and blocks the original optical signal of the 1st band and the laser pumping signal. |
