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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 29, Iss. 18 — Sep. 15, 2011
  • pp: 2790–2800

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

Giulio Colavolpe, Tommaso Foggi, Enrico Forestieri, and Marco Secondini

Journal of Lightwave Technology, Vol. 29, Issue 18, pp. 2790-2800 (2011)

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One of the most severe impairments that affect coherent optical systems employing high-order modulation formats is phase noise due to transmit and receive lasers. This is especially detrimental in uncompensated links, where an ideal compensator for channel distortions and laser phase noise should first eliminate receive phase noise, then equalize channel distortions, and only later compensate for transmit phase noise. Unfortunately, the simultaneous presence of transmit and receive phase noise makes very difficult to discriminate between them, even in the presence of a pilot tone. Moreover, the picture is different for optical systems using single-carrier or orthogonal frequency division multiplexing, where transmit and receive phase noise components may have a different impact. All these aspects are analyzed and discussed in this paper. A novel digital coherence enhancement (DCE) technique, able to significantly reduce the phase noise of transmit or receive lasers by using an interferometric device plus a very simple electronic processing, is also described. The performance of this technique and the statistical properties of the residual phase noise are analytically derived and verified by simulations, showing a high increase of the maximum bit-rate-distance product. The practical implementation of DCE is finally discussed and some alternative implementation schemes are presented.

© 2011 IEEE

Giulio Colavolpe, Tommaso Foggi, Enrico Forestieri, and Marco Secondini, "Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems," J. Lightwave Technol. 29, 2790-2800 (2011)

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