All optical logic NAND gate based on two-photon absorption

A. Kotb; S. Ma; Z. Chen; N. K. Dutta; G. Said

doi:10.1117/12.858177

17 August 2010 All optical logic NAND gate based on two-photon absorption

A. Kotb, S. Ma, Z. Chen, N. K. Dutta, G. Said

Proceedings Volume 7781, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IV; 77810D (2010) https://doi.org/10.1117/12.858177
Event: SPIE Photonic Devices + Applications, 2010, San Diego, California, United States

Abstract

When the two-photon absorption of a high intensity pump beam takes place in a semiconductor optical amplifier there is an associated fast phase change of a weak probe signal. A scheme to realize fast all-optical NAND logic function using two-photon absorption induced phase change has been analyzed. NAND gate is important because other Boolean logic elements and circuits can be demonstrated using NAND gates as a basic building block. Rate equations for semiconductor optical amplifiers (for input data signals with high intensity) configured in the form of a Mach-Zehnder interferometer has been solved. The input intensities are high enough so that the two-photon induced phase change is larger than the regular gain induced phase change. The model shows that both AND and NAND operation at 250 Gb/s with good signal to noise ratio is feasible.

Citation Download Citation

A. Kotb, S. Ma, Z. Chen, N. K. Dutta, and G. Said "All optical logic NAND gate based on two-photon absorption", Proc. SPIE 7781, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IV, 77810D (17 August 2010); https://doi.org/10.1117/12.858177

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