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Asymmetric dithering technique for bias condition monitoring in optical QPSK modulator

Asymmetric dithering technique for bias condition monitoring in optical QPSK modulator

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A simple and highly sensitive bias condition monitoring circuit is presented for optical quadrature phase shift keying (QPSK) modulators. The proposed asymmetric dithering technique is shown to be capable of monitoring three bias states simultaneously. The dithering penalty is shown to be less than 0.2 dB.

References

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    2. 2)
      • Yamada, T.: `86-Gbit/s differential quadrature phase-shift-keying modulator using hybrid assembly technique with planar lightwave circuit and LiNbO', LEOS 2006, October 2006, Montreal, QC, Canada, ThDD4, Vol. 2, pp. 963–964.
    3. 3)
      • Sekine, K.: `A novel bias control technique for MZ modulator with monitoring power of backward light for advanced modulation formats', OFC2007, March 2007, Anaheim, CA, USA, OTuH5, Vol. 1, pp. 451–453.
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      • W.R. Peng . Compensation for I/Q imbalances and bias deviation of the Mach-Zehnder modulators in direct-detected optical OFDM systems. IEEE Photonics Technol. Lett. , 103 - 105
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