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Optical Engineering

Nyquist 4-ary pulse amplitude modulation scheme based on electrical Nyquist pulse shaping and fiber Bragg grating filter
Author(s): Na Liu; Xue Chen; Cheng Ju; Qi Zhang; Huitao Wang
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Paper Abstract

Intensity modulation and direct detection signal are sensitive to power fading and nonlinear intersymbol interference (ISI) induced by modulator chirp, fiber dispersion, and square-law photo-detection. We propose and experimentally demonstrate a Nyquist 4-ary pulse amplitude modulation and direct detection scheme relying on pulse-shaping with an electrical filter and optical equalization with a vestigial-sideband (VSB) filter in the transmitter. The power fading could be eliminated by using the VSB filter. Compared with conventional 4-ary pulse amplitude modulation, the Nyquist signal has a stronger resistance to nonlinear ISI.

Paper Details

Date Published: 13 April 2015
PDF: 4 pages
Opt. Eng. 54(4) 046105 doi: 10.1117/1.OE.54.4.046105
Published in: Optical Engineering Volume 54, Issue 4
Show Author Affiliations
Na Liu, Beijing Univ. of Posts and Telecommunications (China)
Xue Chen, Beijing Univ. of Posts and Telecommunications (China)
Cheng Ju, Beijing Univ. of Posts and Telecommunications (China)
Qi Zhang, ZTE Corp. (China)
Huitao Wang, ZTE Corp. (China)


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