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Steadily increasing data traffic gives rise to increasing capacity requirements in optical communication networks. It is well understood that systems with higher symbol rates and/or multi-level modulation formats generally demand higher optical signal-to-noise ratio (OSNR) at the receiver to achieve acceptable system performance. In terms of the optical fiber medium, higher OSNR can be attained by lowering fiber loss and reducing fiber nonlinearity. We review several recent experimental investigations of 112 Gb/s PM-QPSK transmission with reach-length results enabled by the use of optical fibers with ultra-low loss and very large effective area.

112 Gb/s PM-QPSK transmission systems with reach lengths enabled by optical fibers with ultra-low loss and very large effective area