2019•Unpublished venueRequires access

PAM-6 generation using 32-QAM constellation

Łukasz Chorchos

Abstract

In this paper an intermediate solution to pulse amplitude modulation with 4 levels (PAM-4) and PAM-8, namely PAM-6 is presented. The generation of the signal is based on a constellation from 32-quadrature amplitude modulation (32-QAM) and assumes the I and Q components to be interleaved, which allows its application in intensity modulation/direct detection systems. The PAM-6 modulation shows higher resistance to noise than PAM-8 and increased by 25% the bitrate for constant bandwidth when compared to PAM-4. In the paper, experimental results and a comparison of PAM-6 modulation to PAM-4 and PAM-8 is made for an electrical interface, a directly modulated 850nm VCSEL and an externally modulated 1310nm DFB laser.

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Available abstract

Key concepts: Quadrature amplitude modulation, Pulse-amplitude modulation, QAM, Constellation diagram, Amplitude modulation, Modulation (music), Analog transmission, Intensity modulation