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Up to 64 QAM/32 Gbaud flexible dual polarization transmitter for future elastic optical networks

机译：Up to 64 QAM/32 Gbaud flexible dual polarization transmitter for future elastic optical networks

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摘要

Next generation elastic optical networks will very likely require dual polarization (DP) optical transmitter with inherent flexibility to dynamically change its baud rate and/or modulation format. We develop a prototype of compact flexible DP M-ary quadrature amplitude modulation (MQAM) optical transmitter and demonstrate its reconfigurability to accommodate baud rates ranging from 8 to 32 Gbaud/s using the same hardware. The prototype has another advantage in that the modulation format can also be dynamically changed from binary phase shift keying up to 64 quadrature amplitude modulation (QAM) for single and DPs, all over a single optical carrier. This allows the generation of variable data rate up to 384-Gb/s over a single wavelength. Experimental results show that for the most challenging setting of DP-64 QAM/32 Gbaud, the worst case values of error vector magnitude and bit error rate are 6.7 and 3 × 10~(-2), respectively. For less stringent settings, i.e., lower baud rate and/or lower modulation format, forward error correction limit error free transmission is easily obtained. Further results are also reported to demonstrate transmitter flexibility and software definability, by measuring symbol streams showing instantaneous swapping between modulation schemes with a swapping time less than 10 symbols duration, i.e., 0.3 ns.
机译：下一代弹性光网络很可能需要具有固有灵活性的双偏振（DP）光发射机，以动态改变其波特率和/或调制格式。我们开发了一个紧凑型柔性DP M-ary正交幅度调制（MQAM）光发射器的原型，并展示了其可重新配置性，以适应使用相同硬件的波特率范围为8至32 Gbaud/s。该原型的另一个优点是，调制格式还可以在单个光载波上动态更改，从二进制相移键控到单个和 DP 的高达 64 个正交幅度调制 （QAM）。这允许在单个波长上生成高达 384Gb/s 的可变数据速率。实验结果表明，在DP-64 QAM/32 Gbaud最具挑战性的设置下，误差矢量幅度和误码率的最坏情况值分别为6.7和3×10~（-2）。对于不太严格的设置，即较低的波特率和/或较低的调制格式，很容易获得前向纠错限制无差错传输。报告还报告了进一步的结果，通过测量符号流，显示了交换时间小于 10 个符号持续时间（即 0.3 ns）的调制方案之间的瞬时交换，从而证明了发射机的灵活性和软件可定义性。

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