Effect of interference of impulse noise induced by clipping on BER of M-QAM signal in analog/digital hybrid optical transmission systems

✍ Scribed by Kazuki Maeda; Masaru Fuse; Kuniaki Utsumi; Hiroaki Nakata; Katsuyuki Fujito

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 220 KB
• Volume: 81
• Category: Article
• ISSN: 8756-6621
• DOI: 10.1002/(sici)1520-6424(199808)81:8<1::aid-ecja1>3.0.co;2-l

✦ Synopsis

The bit error rate (BER) of the M-QAM signal in analog/digital hybrid optical transmission (hybrid transmission) shows a floor-like feature due to impulse noise induced by clipping the subcarrier multiplexed signal at the laser threshold. This paper proposes a new BER analysis model, which is modified from our previous one based on Middletons class A impulse noise model, and compares analytical results with experimental data. The analytical results agree particularly well with the experimental data for small optical modulation indexes (OMI) of the M-QAM signal; consequently, these results can be applied to estimating the bit error rate of the digital channel in hybrid transmission. There is also a tendency for the analysis results to diverge more greatly from the experimental data as the OMIs of the M-QAM signal increase. We also discuss the reasons for this divergence.