Optical transmission apparatus

摘要

In a transmission apparatus (8), modulation sections (201) convert digital data signals into DSL modulated signals, which are thereafter subjected to frequency conversion so as to span respectively different frequency bands. A combination section (207) frequency-division-multiplexes output signals from the modulation sections (201). An optical modulation section (102) converts the frequency-division-multiplexed signal into an optical signal. An optical detection section (104) reconverts the optical signal which has been transmitted over the optical transmission section (103) into an electrical signal. A splitter section (408) demultiplexes the electrical signal. Each of second frequency conversion sections 811 subjects either one of the demultiplexed signals to frequency conversion, and sends a resultant DSL modulated signal onto an electrical transmission section (105). The DSL demodulation section (106) reconverts the DSL modulated signal which has been transmitted over the electrical transmission section (105) into the original digital data signal. <IMAGE>