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Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning

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3 Author(s)
Fatadin, I. ; Photonics Team, Nat. Phys. Lab., Teddington, UK ; Ives, D. ; Savory, S.J.

The laser linewidth tolerance for 16-ary quadrature amplitude modulation (16-QAM) coherent optical systems is investigated using a quaternary phase-shift-keying (QPSK) partition scheme. The different stages needed to partition the square-16-QAM into QPSK constellations for carrier phase estimation are discussed. It is shown that at 1 dB above sensitivity at a bit-error rate of 10-3, a combined linewidths symbol duration product of 1 ?? 10-4 is tolerable. The performance of the algorithm with different bits resolution in the analog-to-digital converter is also presented.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 9 )

Date of Publication:

May1, 2010

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