Nyquist 4-ary pulse amplitude modulation scheme based on electrical Nyquist pulse shaping and fiber Bragg grating filter

Na Liu; Xue Chen; Cheng Ju; Qi Zhang; Huitao Wang

doi:10.1117/1.OE.54.4.046105

13 April 2015 Nyquist 4-ary pulse amplitude modulation scheme based on electrical Nyquist pulse shaping and fiber Bragg grating filter

Na Liu, Xue Chen, Cheng Ju, Qi Zhang, Huitao Wang

Author Affiliations +

Optical Engineering, Vol. 54, Issue 4, 046105 (April 2015). https://doi.org/10.1117/1.OE.54.4.046105

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.

Citation Download Citation

Na Liu, Xue Chen, Cheng Ju, Qi Zhang, and Huitao Wang "Nyquist 4-ary pulse amplitude modulation scheme based on electrical Nyquist pulse shaping and fiber Bragg grating filter," Optical Engineering 54(4), 046105 (13 April 2015). https://doi.org/10.1117/1.OE.54.4.046105

Published: 13 April 2015

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