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Comparison between polarization-multiplexed DPSK and single-polarization DQPSK in 640 Gbaud, 1.28 Tbit/s-500 km single-channel transmission

机译:640 Gbaud,1.28 Tbit / s-500 km单信道传输中的偏振复用DPSK和单偏振DQPSK的比较

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摘要

We describe two schemes for 1.28 Tbit/s single-channel transmission at 640 Gbaud with polarization-multiplexed DPSK and single-polarization DQPSK, and compare their performance in a 500 km transmission. We found that the polarization multiplexing of ultrahigh-speed DPSK signals, for example at 640 Gbaud, is sensitive to the PMD characteristics of the transmission link. Even when first-order PMD is fully compensated, second-order PMD, which varies over a long period and is difficult to compensate, results in inter-polarization crosstalk induced by depolarization. The single-polarization transmission of a 640 Gbaud DQPSK signal is less vulnerable to PMD and therefore more stable, as the depolarized components induced by second-order PMD can be easily rejected with a polarizer. However, its performance is limited because the OSNR must be higher than for DPSK.
机译:我们描述了极化复用DPSK和单极化DQPSK的640 Gbaud下1.28 Tbit / s单信道传输的两种方案,并比较了它们在500 km传输中的性能。我们发现,超高速DPSK信号(例如640 Gbaud)的偏振复用对传输链路的PMD特性很敏感。即使对一阶PMD进行了完全补偿,但长时间变化且难以补偿的二阶PMD也会导致由去极化引起的极化间串扰。 640 Gbaud DQPSK信号的单极化传输不易受到PMD的影响,因此更稳定,因为由二阶PMD引起的去极化分量很容易被极化器抑制。但是,由于OSNR必须高于DPSK,因此其性能受到限制。

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