| 摘要 |
A wavelength division multiplexing transmission system in which a first channel using an intensity modulation scheme and a second channel using a phase modulation scheme are present includes a polarization scrambler inserted into a signal path of either one of the first channel and the second channel to perform polarization scrambling, and a drive unit configured to drive the polarization scrambler at frequency greater than or equal to a value defined as: (bit rate of phase modulated signal)/(error correction frame length)x2.
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