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We review the potentials and challenges of applying coherent detection in long-haul transmission systems. We compare several different coherent detection schemes from the aspects of receiver sensitivity, carrier phase recovery, and fiber nonlinearity induced penalty.
We discuss potential advantages of coherent detection in reducing required OSNR or increasing spectral efficiency of current submarine optical systems. We investigate the impact of carrier-phase-estimation schemes and fiber nonlinearity on coherent-detection performance.
In this paper we evaluate the channel capacity of single-mode fiber systems considering two polarizations. We assume systems perturbed by linear amplified spontaneous emission noise (ASEN), namely, ASEN channels. We also assume an ideal coherent receiver that detects a channel's full optical field. We show that the system required OSNR can still be significantly reduced with combined multidimensional...
We propose a practical way for selecting multiple decision thresholds maximizing mutual information. We show that when soft-decision error correction performance approaches Shannon limit, optimal thresholds converge to the ones maximizing mutual information.
New modulation formats targeting long distance transmission should perform as well or better than RZ while providing other desirable attributes such as dispersion tolerance and spectral efficiency.
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