| 摘要 |
PROBLEM TO BE SOLVED: To obtain an optical communication element, especially, an optical selector switch with low switching speed by using a rare-earth doped fiber light amplifier as a switch element of a gain switch optical selector. SOLUTION: The secondary output of a coupler 207 is supplied to a light- electricity convertor 208, and its output is subject to accurate pumping selection in a selection circuit 209. In this step, the circuit 208 monitors the power level of a selection signal and determines a parameter and an ID tag related to the selection route to be supplied to the coupler 207. In addition, an instruction and control information from an instruction and control device 210 is supplied to the circuit 209, and it is used together with an information from other net element in an optical system, so that a pump 205 or a pump 206 is selected, and according to the selection, an amplifier 203 or an amplifier 204 is selected to output an optical signal as an output to an optical fiber 211 through the coupler 207. |
