| 摘要 |
According to one embodiment, a signal transmission circuit includes: a first electro optical converter converting a read electric signal to a first optical signal having an optional wavelengthλR; a first photo-electric converter configured to reconvert the first optical signal to the read electric signal; a second electro optical converter converting a electric signal to be recorded to a second optical signal having a wavelengthλW different from theλR; a second photo-electric converter reconverting the second optical signal to the electric signal to be recorded; a first optical multiplexer/demultiplexer connected to the first electro optical converter and the second photo-electric converter, and multiplexing and demultiplexing the first and second optical signals; a second optical multiplexer/demultiplexer multiplexing and demultiplexing the first and second optical signals; and an optical transmission medium connected to the first and second optical multiplexers/demultiplexers, and transmits the multiplexed first and second optical signals.
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