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Proceedings Paper

10Gbit/s all-optical NRZ to RZ conversion based on TOAD
Author(s): Yumei Yan; Lina Yin; Yunfeng Zhou; Guoming Liu; Jian Wu; Jintong Lin
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Paper Abstract

Future network will include wavelength division multiplexing (WDM) and optical time division multiplexing (OTDM) technologies. All-optical format conversion between their respective preferable data formats, non-return-to-zero (NRZ) and return-to-zero (RZ), may become an important technology. In this paper, 10Gbit/s all-optical NRZ-to-RZ conversion is demonstrated based on terahertz optical asymmetric demultiplexer (TOAD) using clock all-optically recovered from the NRZ signal for the first time. The clock component is enhanced in an SOA and the pseudo-return-to-zero (PRZ) signal is filtered. The PRZ signal is input into an injection mode-locked fiber ring laser for clock recovery. The recovered clock and the NRZ signal are input into TOAD as pump signal and probe signal, respectively, and format conversion is performed. The quality of the converted RZ signal is determined by that of the recovered clock and the NRZ signal, whereas hardly influenced by gain recovery time of the SOA. In the experimental demonstration, the obtained RZ signal has an extinction ratio of 8.7dB and low pattern dependency. After conversion, the spectrum broadens obviously and shows multimode structure with spectrum interval of 0.08nm, which matches with the bit rate 10Gbit/s. Furthermore, this format conversion method has some tolerance on the pattern dependency of the clock signal.

Paper Details

Date Published: 28 January 2006
PDF: 6 pages
Proc. SPIE 6025, ICO20: Optical Communication, 60250R (28 January 2006); doi: 10.1117/12.667018
Show Author Affiliations
Yumei Yan, Beijing Univ. of Posts and Telecommunications (China)
Lina Yin, Beijing Univ. of Posts and Telecommunications (China)
Yunfeng Zhou, Beijing Univ. of Posts and Telecommunications (China)
Guoming Liu, Beijing Univ. of Posts and Telecommunications (China)
Jian Wu, Beijing Univ. of Posts and Telecommunications (China)
Jintong Lin, Beijing Univ. of Posts and Telecommunications (China)

Published in SPIE Proceedings Vol. 6025:
ICO20: Optical Communication
Yun-Chur Chung; Shizhong Xie, Editor(s)

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