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A single-channel 640-Gb/s differential phase-shift-keying transmission over 525 km was successfully demonstrated in a single polarization. A new ultrafast time-domain optical Fourier transformation (OFT) circuit was developed, in which the strong chirp required for the OFT of a subpicosecond optical pulse was realized with a phase modulator operated in a round-trip configuration. By applying this...
A 640 Gbit/s single-polarization DPSK signal was transmitted over 525 km in a single channel. Time-domain optical Fourier transformation in a round-trip configuration greatly enhanced the tolerance to higher-order PMD and provided error-free performance.
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