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Optical Engineering

Optical frequency comb generation with high tone-to-noise ratio for large-capacity wavelength division multiplexed passive optical network
Author(s): Rahat Ullah; Bo Liu; Qi Zhang; Qinghua Tian; Feng Tian; Zhaowei Qu; Cheng Yan; Muhammad Saad Khan; Ibrar Ahmad; Xiangjun Xin
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Paper Abstract

We propose a technique for the generation of optical frequency comb from a single source, which reduces the costs of optical access networks. Two Mach-Zehnder modulators are cascaded with one phase modulator driven by radiofrequency signals. With 10-GHz frequency spacing, the generated 40 optical multicarriers have good tone-to-noise ratio with least excursions in their comb lines. The laser array at the optical line terminal of the conventional wavelength division multiplexed passive optical network (WDM-PON) system has been replaced with optical frequency comb generator (OFCG), which may result in cost-effective optical line terminal (OLT) supporting a large-capacity WDM-PON system. Of 40 carriers generated, each carrier carries 10 Gbps data based on differential phase-shift keying. Four hundred Gbps multiplexed data from all channels are successfully transmitted through a fiber span of 25 km with negligible power penalties. Part of the downlink signal is used in uplink transmission at optical network unit where intensity-modulated on-off keying is deployed for remodulation. Theoretical analysis of the proposed WDM-PON system based on OFCG are in good agreement with simulation results. The metrics considered for the analysis of the proposed OFCG in a WDM-PON system are power penalties of the full-duplex transmission, eye diagrams, and bit error rate.

Paper Details

Date Published: 3 November 2015
PDF: 9 pages
Opt. Eng. 54(11) 116102 doi: 10.1117/1.OE.54.11.116102
Published in: Optical Engineering Volume 54, Issue 11
Show Author Affiliations
Rahat Ullah, Beijing Univ. of Posts and Telecommunications (China)
Bo Liu, Beijing Univ. of Posts and Telecommunications (China)
Qi Zhang, Beijing Univ. of Posts and Telecommunications (China)
Qinghua Tian, Beijing Univ. of Posts and Telecommunications (China)
Feng Tian, Beijing Univ. of Posts and Telecommunications (China)
Zhaowei Qu, Beijing Univ. of Posts and Telecommunications (China)
Cheng Yan, Tsinghua Univ. (China)
Muhammad Saad Khan, Beijing Univ. of Posts and Telecommunications (China)
Ibrar Ahmad, Beijing Univ. of Posts and Telecommunications (China)
Xiangjun Xin, Beijing Univ. of Posts and Telecommunications (China)


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