We report the first terabit/s superchannel transmission over a submarine distance >10,000 km. Four 1.15-Tb/s
superchannels, each consisting of 23 optical subcarriers at 12.5-GHz spacing are modulated with DP-QPSK at 12.5
Gbaud. The WDM signal is transmitted over 168×60.6-km spans of hybrid large-core/ultra low-loss fibers with inline
amplification by low noise C-band EDFAs. The system achieved a Q-factor margin of 2 dB assuming the use of HDFEC,
and a spectral efficiency of 3.6 b/s/Hz is achieved.
KEYWORDS: Digital signal processing, Orthogonal frequency division multiplexing, Modulation, Polarization, Signal detection, Receivers, Optical communications, Multiplexing, Signal processing, Optical fibers
We introduce two important technologies for development of next generation ultra-high-speed optical communications:
(i) polarization multiplexing, phase modulation with digital coherent detection, and (ii) OFDM-based optical fiber
transmission. In both schemes, digital signal processing plays a key role in recovering the signal and mitigating the
detrimental effects from optical signal transmission. We further describe a novel three dimensional low-density parity
check (LDPC) coded modulation scheme, including its principle and system performance.
For the first time, we experimentally investigated and demonstrated waveband switching for 100 Gb/s DWDM system
with high spectral efficiency of 3.4 b/s/Hz. 3 adjacent 25 GHz-spaced 114 Gb/s PolMux-RZ-8PSK channels are grouped
as a waveband to be switched and transmitted through 4 WSS-based ROADM nodes. Error free transmission is achieved
with little filtering effect observed even after 4 ROADM nodes. The transmission performance shows that waveband
switching based on WSS can be used in high spectral efficiency DWDM systems. This can reduce the switching
hardware cost and operation expense in highly dense WDM systems.
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