DIGITAL OPTICAL REPEATER OF CASCADE MODE

摘要

PURPOSE: A digital optical repeater of a cascade mode is provided to transceive a digital optical signal through an optical path without rendering a mater optical repeater and a slave optical repeater connected with a cascade mode to convert a digital signal to an analog signal. CONSTITUTION: A signal applied from a mobile terminal(500) to the first slave optical repeater(300) is received through the second antenna(360) at a later time than the first antenna(324). The signal applied through the second antenna(360), an arrester(362), a coupler(364) and a filter(366) is amplified by the second low noise amplifier(368) and applied through a filter(370) to the third frequency reducing unit(372). The third frequency reducing unit(372) reduces a frequency of an analog signal and applies it to the third A/D converter(374), and then, the third A/D converter(374) converts the analog signal applied from the third frequency reducing unit(372) to a digital signal. The third A/D converter(374) applies the digital signal through a filter(376) and a delay unit(378) to the second digital combiner(380). The second digital combiner(380) adds the digital signal applied through the filter(376) and the delay unit(378) and the digital signal applied through the fourth demultiplexer(302) from the third optical module unit(346). The second digital combiner(380) applies a radio frequency through the third multiplexer(382) to the second optical module unit(302), and the second optical module unit(302) converts the radio frequency applied through the third multiplexer(382) from the second digital combiner(380) to an optical signal and transmits it to a master optical repeater(200).