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All-optical XOR logic gate for 40Gb/s DPSK signals via FWM in a silicon nanowire

Centre for Ultrahigh-bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, The University of Sydney, NSW 2006, Australia.
Optics Express (Impact Factor: 3.53). 10/2011; 19(21):20364-71. DOI: 10.1364/OE.19.020364
Source: PubMed

ABSTRACT We demonstrate an all-optical XOR logic function for 40Gb/s differential phase-shift keyed (DPSK) data signals in the C-band, based on four-wave mixing (FWM) in a silicon nanowire. Error-free operation with a system penalty of ~3.0dB and ~4.3dB at 10⁻⁹ BER is achieved.

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    • "All-optical signal processing chips have been demonstrated in silicon nanowires [1] and chalcogenide glass (ChG) waveguides [2] [3] including all-optical logic [4], demultiplexing from 160Gb/s [5] to over 1Tb/s [6] via four-wave mixing (FWM), all-optical performance monitoring using slow light at bit rates up to 640Gb/s [7] [8] [9], optical regeneration [10] [11], and many other processes. The third order nonlinear efficiency of alloptical devices can be improved dramatically by increasing the waveguide nonlinear parameter, γ =  n 2 / c A eff (where A eff is the waveguide effective area, n 2 the "
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    • "research to improve the nonlinear performance of these devices [23]. Fast logic gates have also been implemented using other optical elements such as PPLN waveguides [24] and silicon nanowires [25]. However, these logic gates can only perform simple operations and efforts towards higher-scale processing are very scarce in literature. "
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    ABSTRACT: In this paper, we study the use of integrated semi-conductor optical amplifiers as the basic building block for larger-scale programmable photonic circuits. Making use of the non-linear response of these devices, we study the performance of 4-bit all-optical NOR gates based on fully integrable components for high speed all-optical look up tables. Feasibility of the proposed architecture is demonstrated by proof-of-concept experiments using both commercially available devices and photonic integrated circuits.
    Journal of Lightwave Technology 04/2013; 31(8):1178. DOI:10.1109/JLT.2013.2245099 · 2.86 Impact Factor
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    • "XOR gates for DPSK signals have been demonstrated using four-wave mixing (FWM) in semiconductor optical amplifiers (SOAs) but only limited receiver sensitivities has been obtained [5]. FWM-based XOR gates have also been investigated in different media such as highly nonlinear fibers (HNLFs), and silicon nanowires [6]. In this work, we focus on the use of SOAs as the input power requirements are lower compared to other passive media. "
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