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  • Chinese Optics Letters
  • Vol. 10,
  • Issue 9,
  • pp. 090602-090602
  • (2012)

Experimental and theoretical analyses of RSOA-based colorless-ONUs with 4PAM signal in the up-link

Yueying Zhan, Min Zhang, Lei Liu, Mingtao Liu, Zhuo Liu, and Xue Chen

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Abstract

A scheme that utilizes the 4-level pulse-amplitude-modulated (4PAM) signal as the re-modulated signal of colorless optical network units (ONUs) based on reflection semiconductor optical amplifiers (RSOAs) is proposed. The system with 10-Gb/s non-return-to-zero (NRZ) downstream and 5-Gb/s 4PAM upstream signals is theoretically analyzed and experimentally verified. Simulation and experimental results reveal that the 4PAM re-modulated signal yields better performance than the NRZ signal in the upstream. A receiver power penalty of 1.6 dB is also improved by the 4PAM signal at back-to-back (BtB) transmission, whereas another receiver power penalty of 1.5 dB improved after 30-km single mode fiber transmission, where 4PAM signals are used as upstream signal.

© 2012 Chinese Optics Letters

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