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

Fatadin, I; Ives, D; Savory, SJ; (2010) Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning. IEEE PHOTONIC TECH L , 22 (9) 631 - 633. 10.1109/LPT.2010.2043524.

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Abstract

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 x 10(-4) is tolerable. The performance of the algorithm with different bits resolution in the analog-to-digital converter is also presented.

Type:Article
Title:Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning
DOI:10.1109/LPT.2010.2043524
Keywords:Carrier phase recovery, quadrature amplitude modulation (QAM), quaternary phase-shift-keying (QPSK) partition, FEEDFORWARD CARRIER RECOVERY, PHASE ESTIMATION
UCL classification:UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering

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