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Level Allocation of Four-Level Pulse-Amplitude Modulation Signal in Optically Pre-Amplified Receiver Systems

Hiroki KAWAHARA, Koji IGARASHI, Kyo INOUE

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Summary :

This study numerically investigates the symbol-level allocation of four-level pulse-amplitude modulation (PAM4) signals for optically pre-amplified receiver systems. Three level-allocation schemes are examined: intensity-equispaced, amplitude-equispaced, and numerically optimized. Numerical simulations are conducted to comprehensively compare the receiver sensitivities for these level-allocation schemes under various system conditions. The results show that the superiority or inferiority between the level allocations is significantly dependent on the system conditions of the bandwidth of amplified spontaneous emission light, modulation bandwidth, and signal extinction ratio (ER). The mechanisms underlying these dependencies are also discussed.

Publication
IEICE TRANSACTIONS on Communications Vol.E106-B No.8 pp.652-659
Publication Date
2023/08/01
Publicized
2023/02/03
Online ISSN
1745-1345
DOI
10.1587/transcom.2022EBP3162
Type of Manuscript
PAPER
Category
Fiber-Optic Transmission for Communications

Authors

Hiroki KAWAHARA
  Osaka University
Koji IGARASHI
  Osaka University
Kyo INOUE
  Osaka University

Keyword