C. L. SUI ET AL.

Copyright © 2013 SciRes. OPJ

174

It

4. Conclusions

ngale theory was introduced to ana-

’s easy to observe that MPSK modulated signal suffers

more SNR degradation due to phase noise. And with the

increasing of signal constellation’s size, the signal be-

comes more and more sensitive to the phase noise. If the

laser line width is 1MHz and the modulation format is

64QAM, extra 2.5dB SNR needs to be compensated for

the phase noise effect.

In the paper, Marti

lyze the effect of phase noise for the first time. Through

stochastic Fubini’s theorem and martingale representa-

tion theorem, we proved the process 0

1tWds is a pre-

s

T

dictable martingale which can be applied to Ito Form

5. Acknowledgements

orted by the Nationa

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The work was jointly suppl 973

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