1 March 2006 4-ary PAM signaling for increasing the capacity of metro light-wave systems
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We investigated both experimentally and by simulation, non-return-to-zero (NRZ) and return-to-zero (RZ) 4-ary PAM operating at 20 Gb/s. A simple scheme to realize the quadratic signal leveling by suitably driving a MZ modulator is proposed, which provides greater than 6 dB improvement in receiver sensitivity as compared to equal level spacing. We experimentally demonstrated NRZ and RZ 10 Gbaud/s 4-ARY PAM transmissions over an 80 km standard single mode fiber (SSMF) link as a proof of concept and more detailed experimental results over longer reach will follow. Numerical simulations for the 4-ary PAM performance over longer distances (>200 km) are also presented.
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Sivakumar Lanka, Sivakumar Lanka, Moncef B. Tayahi, Moncef B. Tayahi, Jan Cartsens, Jan Cartsens, Lutz Hofmann, Lutz Hofmann, } "4-ary PAM signaling for increasing the capacity of metro light-wave systems", Proc. SPIE 6105, Free-Space Laser Communication Technologies XVIII, 610509 (1 March 2006); doi: 10.1117/12.648469; https://doi.org/10.1117/12.648469

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