| 摘要 |
There is provided an optical transmission system including a first optical transmission apparatus configured to have a first transmission mode in which a first signal is transmitted at a first optical level, and a second transmission mode in which a second signal is transmitted at a second optical level after an operation in the first transmission mode, the first optical level being lower than the second optical level, and a second optical transmission apparatus configured to have a third transmission mode in which a response signal to the first signal is transmitted at the first optical level to the first optical transmission apparatus, and a fourth transmission mode in which a response signal to the second signal is transmitted at the second optical level to the first optical transmission apparatus after an operation in the third transmission mode.
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