Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning.
IEEE PHOTONIC TECH L
631 - 633.
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.
|Title:||Laser Linewidth Tolerance for 16-QAM Coherent Optical Systems Using QPSK Partitioning|
|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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