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Optical Engineering

Electro-optical time gating based on Mach-Zehnder modulator for multiple access interference elimination in optical code-division multiple access networks
Author(s): Yinfang Chen; Rong Wang; Tao Fang; Tao Pu; Peng Xiang; Jilin Zheng; Huatao Zhu
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Paper Abstract

An electro-optical time gating technique, which is based on an electrical return-to-zero (RZ) pulse driven Mach-Zehnder modulator (MZM) for eliminating multiple access interference (MAI) in optical code-division multiple access (OCDMA) networks is proposed. This technique is successfully simulated in an eight-user two-dimensional wavelength-hopping time-spreading system, as well as in a three-user temporal phase encoding system. Results show that in both systems the MAI noise is efficiently removed and the average received power penalty improved. Both achieve error-free transmissions at a bit rate of 2.5  Gb/s . In addition, we also individually discuss effects of parameters in two systems, such as the extinction ratio of the MZM, the duty cycle of the driven RZ pulse, and the time misalignment between the driven pulse and the decoded autocorrelation peak, on the output bit error rate performance. Our work shows that employing a common MZM as a thresholder provides another probability and an interesting cost-effective choice for a smart size, low energy, and less complex thresholding technique for integrated detection in OCDMA networks.

Paper Details

Date Published: 7 May 2014
PDF: 5 pages
Opt. Eng. 53(5) 056103 doi: 10.1117/1.OE.53.5.056103
Published in: Optical Engineering Volume 53, Issue 5
Show Author Affiliations
Yinfang Chen, The PLA Univ. of Science and Technology (China)
Rong Wang, The PLA Univ. of Science and Technology (China)
Tao Fang, The PLA Univ. of Science and Technology (China)
Tao Pu, The PLA Univ. of Science and Technology (China)
Peng Xiang, The PLA Univ. of Science and Technology (China)
Jilin Zheng, The PLA Univ. of Science and Technology (China)
Huatao Zhu, The PLA Univ. of Science and Technology (China)


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