OPTICAL REPEATER AND OPTICAL TRANSIMSSION LINE NETWORK USING THE SAME

摘要

PURPOSE:To eliminate the need to supply electric power to a repeating means and to enable long-period operation by amplifying an input light signal directly by an optical amplifying element with exciting light. CONSTITUTION:Signal light SL from a transmitting terminal station 30A is supplied to the optical repeater 101 through an optical fiber 121 and an optical cable 111 and its amplification output is sent to a receiving terminal station 30B through an optical fiber 122 of an optical cable 112, an optical repeater 102, and an optical fiber 123 and converted into a signal SE by a photodetecting device 19. For example, signal light SL at an input part 20 is wavelength- multiplexed with exciting light Lp from an optical fiber 151 of an optical cable 161 by a multiplexer 131 at an optical repeater 101 and supplied to an optical amplifying element 14. The light Lp excites the element 14, and consequently the light SL is amplified by the element 14 and send out to the cable 112 through an output part 21. An amplifier 102 carries out similar operation.