256 Tbit/s/ch (640 Gbaud) polarization-multiplexed DQPSK non-coherent Nyquist pulse transmission over 525 km

Abstract

We demonstrate a single-channel 2.56 Tbit/s polarization-multiplexed DQPSK transmission using 640 Gbaud non-coherent optical Nyquist pulses. By virtue of a large tolerance to polarization-mode dispersion, the detrimental depolarization-induced crosstalk was reduced by 3.8 dB compared with RZ pulses. As a result, the transmission distance was substantially extended to 525 km compared with the distance of 300 km obtained with a Gaussian pulse.

On the generation of high-quality Nyquist pulses in mode-locked fiber lasers

“…Due to the rectangular-shaped spectrum and sinc-shaped temporal waveform, Nyquist pulses have high value in modern communication technology, from electronic communications to optical communications and ultrafast science. For example, in the field of optical communications, [2][3][4][5][6][7][8][9][10][11][12][13][14][15] Nyquist pulses can increase the bandwidth of the systems. [16] Various studies on Nyquist pulses have been reported.…”