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Electronic phase conjugation is proposed for nonlinearity compensation in fiber communications. Coherent detection and I/Q modulation are used to implement phase conjugation. Significant performance improvement is achieved in WDM multi-rate systems.
We review and discuss two ultra-high-capacity optical transmission experiments recently demonstrated by using PDM-M-QAM modulation formats and DSP enabled intradyne detection techniques. They are 33.9Tb/s over 580km at SE=3D4.2b/s/Hz and 64Tb/s over 320km at SE=3D8b/s/Hz.
By employing a novel scheme we have generated 112.8-Gb/s polarization-multiplexed (PM)-RZ-64QAM optical signal. Transmission of 112.8-Gb/s PM-RZ-64QAM optical signal over 2??40km of SSMF has been demonstrated in an 8-channel WDM environment on a 12.5GHz grid.
Employing raised-cosine pulse-shaped PDM-36 QAM modulation and both pre- and posttransmission digital equalization, we demonstrate 12.5GHz-spaced, 640 ?? 107 Gbits/s DWDM transmission over 4 ?? 80 km of ultra-large-area fiber with a record capacity of 64 Tb/s at 8 b/s/Hz spectral efficiency.
We review and discuss several enabling technologies for recent breakthrough in high-speed and high spectral efficiency optical transmission, focusing on single-carrier based multi-level, multi-dimensional modulation formats and digital signal process based intradyne coherent detection techniques.
In this paper, we will report our latest experimental results. These includes 20 times 112-Gb/s PDM-RZ-QPSK transmission over 1540-km of standard single mode fiber (SSMF), a record capacity of 17 Tb/s within the C-band optical bandwidth (4.025 THz) over 660 km of ultra-low-loss fiber using 161 times 114-Gbps PDM-RZ-8PSK formats, and hybrid 10 times 112 Gb/s PDM-RZ-QPSK and 10 times 44 Gb/s PDM-NRZ-QPSK...
Employing PDM-RZ-8QAM modulation, digital coherent detection and EDFA-only amplification, we demonstrate 25 GHz-spaced, 320times114Gb/s DWDM transmission through seven spans of ultra-low-loss fiber (average span length/loss of 82.8 km/14.6 dB) with a record capacity of 32Tb/s.
By using PolMux-RZ-QPSK modulation format and digital coherent detection, we have demonstrated 20times112 Gbit/s DWDM transmission over 1540 km of SSMF without using Raman amplification or optical dispersion compensation.
Employing PolMux-RZ-8PSK modulation and coherent detection, we demonstrate 25 GHz-spaced, 161times114 Gb/s DWDM transmission through eight spans of ultra-low-loss fiber (average span length/loss of 82.75 km/14.6 dB) with a record capacity of 17 Tb/s (spectral efficiency 4.2 b/s/Hz) within the C-band EDFA bandwidth (4.025 THz).
By using only C-band EDFAs, we transmitted twenty 200-GHz spaced, 107 Gb/s RZ-DQPSK WDM channels over 1005 km of SSMF with realistically varying span lengths (80 to 100 km), and span losses from 16.5 to 20 dB (average 18.5 dB loss).
We have successfully demonstrated that an inversion-RZ pulse signal can be employed in a 50Gbit/s RZ-DQPSK payload per channel and 50GHz channel spacing optical packet switching network as an orthogonal modulation optical label. This inversion-RZ optical label is generated by a novel and simple scheme.
We propose and experimentally verify a new dynamic gain profile control technique for a multi-wavelength backward-pumped discrete Raman amplifier without using a channel monitor. We demonstrate up to 9 dB static power correction and a dynamic implementation
Polarization dependent gain (PDG) due to signal-signal Raman interaction (SSRI) has been investigated for the first time. We found that PDG can be more than 0.4 dB/span for an 80-channel C-band WDM system when the fiber PMD is lower than 0.04 ps/km/sup 1/2/.
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