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We propose a novel QPSK regenerator scheme based on phase sensitive amplification of a pre-conditioned signal avoiding active phase-locking. Signal pre-conditioning is demonstrated experimentally with error-free (BER < 10−9) performance for a 10-Gbaud QPSK signal.
We demonstrate 43-Tbit/s transmission over 67.4-km seven-core fiber using a single source. Each of the 6 outer cores carries 6 Nyquist-WDM channels using 320-Gbaud Nyquist-OTDM-PDM-QPSK 330-GHz spaced, and the center core carries 10-GHz clock pulses.
We demonstrate simultaneous regeneration of 4×160-Gbit/s signals in a HNLF. The receiver powers at the BER of 10-9 are improved by 1.9 dB, 1.8 dB, 1.6 dB and 1.5 dB for the four channels, respectively.
An 840 fs wide flat-top pulse is generated in a polarisation-independent optical differentiation scheme and used for 640 Gbit/s demultiplexing. The timing jitter tolerance is improved by a factor of three to 310 fs.
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