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Proceedings Paper

40Gb/s all-optical digital encoder/comparator based on semiconductor optical amplifiers
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Paper Abstract

We proposed, experimentally and theoretically demonstrated all-optical two line-four line encoder and two bit-wise comparator of RZ data streams at 40Gb/s based on cross gain modulation (XGM) and four wave mixing (FWM) in three parallel SOAs. Five logic functions for digital encoder and comparator between two signals A and B: A¯ B¯, AB¯, AB¯, AB and A¯⊗¯B¯, were achieved simultaneously. The first three optical logics are realized based on XGM in SOAs, the fourth is realized with FWM, and the fifth is the mixing result of the first and the fourth. A detuning filter is employed to improve the output performance. The output extinction ratio (ER) for the XGM operation is above 10dB, and the ER for FWM operation is around 8 dB. Wide and clear eye patterns for the five logic outputs can be observed. The all optical digital encoder/comparator we demonstrated has advantages of simple structure, multifunctional optical logic functions and high speed.

Paper Details

Date Published: 19 November 2007
PDF: 8 pages
Proc. SPIE 6782, Optoelectronic Materials and Devices II, 678208 (19 November 2007); doi: 10.1117/12.743261
Show Author Affiliations
Yang Wang, Huazhong Univ. of Science and Technology (China)
Xinliang Zhang, Huazhong Univ. of Science and Technology (China)
Jianji Dong, Huazhong Univ. of Science and Technology (China)
Dexiu Huang, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 6782:
Optoelectronic Materials and Devices II
Yoshiaki Nakano, Editor(s)

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