Sjödin Martin, Johannisson Pontus, Wymeersch Henk, Andrekson Peter A, Karlsson Magnus
Photonics Laboratory, Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
Opt Express. 2011 Apr 11;19(8):7839-46. doi: 10.1364/OE.19.007839.
We present the first experimental results for polarization-switched QPSK (PS-QPSK) and make a comparison with polarization-multiplexed QPSK. Our measurements confirm the predicted sensitivity advantage of PS-QPSK. We have also studied the single channel performance after transmission over 300 km and support the results with numerical simulations. It is shown that the two modulation formats have similar nonlinear tolerance and that optical dispersion compensation outperforms compensation with digital signal processing in the single channel case. Finally, we propose a novel transmitter for PS-QPSK based on an IQ modulator and two amplitude modulators driven in a push-pull configuration.
我们展示了偏振切换四相相移键控（PS-QPSK）的首个实验结果，并与偏振复用四相相移键控进行了比较。我们的测量结果证实了PS-QPSK预期的灵敏度优势。我们还研究了在300公里传输后的单通道性能，并通过数值模拟来支持这些结果。结果表明，这两种调制格式具有相似的非线性容限，并且在单通道情况下，光色散补偿优于数字信号处理补偿。最后，我们提出了一种基于IQ调制器和两个以推挽配置驱动的幅度调制器的新型PS-QPSK发射机。
