| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a large number of couplers or photodetectors PD, and to reduce the cost of a optical transmission unit itself. SOLUTION: In a Raman excitation control method for sending out Raman exciting light to an optical transmission line, and optically amplifying an optical signal, the back light of a laser diode which generates the Raman exciting light is detected by a back power monitor, initialization information on the laser diode set in a memory is compared with a power value detected by the back power monitor, and then the feedback control of the light-emitting power of the laser diode is performed on the basis of the comparison result. |
