The modulation crosstalk between combined frequency-shift keying (FSK) and intensity modulation (IM) in an optical label-switching network is analyzed both theoretically and experimentally. A comparison between the performance of nonreturn-to-zero (NRZ) and Manchester-coded payload is made. It is shown that Manchester coding of the payload helps to suppress the crosstalk introduced into, the optical FSK label, thus achieving better network performance than NRZ coding.
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Zhang, J., Chi, N., Holm-Nielsen, P. V., Peucheret, C., & Jeppesen, P. (2003). Performance of Manchester-coded payload in an optical FSK labeling scheme. I E E E Photonics Technology Letters, 15(8), 1174-1176. https://doi.org/10.1109/LPT.2003.815350