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Directly modulated semiconductor lasers for underwater wireless optical communication (UWOC) have limitations in output power and beam quality. Diode-pumped solid-state lasers (DPSSLs) have the merits of long lifetime, high stability, large power and good beam quality, which are promising to realize long-each UWOC. We compose a DPSSL with discrete components and measure its key parameters. The bandwidth...
In this paper, we investigate the physical-layer network coding (PNC) with partial channel state information (CSI) in the context of two way relay communication. We consider the typical scenario that one end node exchanges information with another via a relay without knowing the CSI knowledge between the relay and the other end node. A relay scheme called power weighted mapping (PWM) is proposed to...
We demonstrate transmission of a 100-Gbit/s 32-QAM dual-polarization signal over a 200-km dispersion-managed fiber link using a digital coherent receiver. The receiver sensitivity of −20 dBm at BER = 10−3 is obtained after 200-km transmission.
Phase-noise tolerance of 10-Gsymbol/s 16-QAM signals is investigated both theoretically and experimentally. Optimizing the decision-directed phase-locked loop for carrier-phase estimation, we can obtain acceptable BER performance when the laser linewidth is in the 100-kHz range.
A 1.28-Tbit/s signal on a single carrier is generated by the combination of 16 time-division multiplexing, 16-QAM, and polarization multiplexing. Such a signal is demodulated with a digital coherent receiver having the time-division demultiplexing function.
We demonstrate 100-km transmission of a 40-Gbit/s 16-QAM signal using a digital coherent receiver. The receiver sensitivity of -30 dBm is obtained at BER=10-5.
We demonstrate unrepeated 200-km transmission of 40-Gbit/s 16-QAM signals. In spite of the launched power limitation due to SPM, the acceptable BER performance is obtained owing to high sensitivity of a digital coherent optical receiver.
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