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Preclipping experiment for subcarrier-multiplexed AM/64QAM optical transmission

Preclipping experiment for subcarrier-multiplexed AM/64QAM optical transmission

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Bit-error-rate degradation of the 64QAM signal due to clipping distortion caused by overmodulation at the laser diode is compensated for by preclipping for subcarrier-multiplexed AM/64QAM optical transmission. The worst composite distortions of CSO < –60 dBc and CTB < –65 dBc have been achieved in the 40-channel AM signal band. It has also been confirmed that preclipping is more effective than Reed-Solomon (204, 188) error correction against clipping distortion.

References

    1. 1)
      • M. Murotani , H. Yamamoto . (1985) Digital wireless communications.
    2. 2)
      • Jiang, Q., Kavehrad, M.: `Eliminating clipping-induced transmission impairment in QAM channelsin hybrid AM-VSB/QAMfiber-optic system by preclipping', TuN7, Conf. on Optical Fiber Communication (OFC'95), Technical Digest, 1995, p. 67–68.
    3. 3)
      • K. Maeda , H. Nakata , K. Fujito . Analysis of BER of 16QAM signal in AM/16QAM hybrid optical transmissionsystem. Electron. Lett. , 7 , 640 - 642
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