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Optical pulse controlled all-optical logic gates in SiGe/Si multimode interference

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Abstract

an optical pulse controlled all-optical logic gate with multifunctional performance and asymmetric structure has been designed theoretically in SiGe/Si materials using multimode interference principle. By switching the optical signal to different input waveguide ports, the device can function as OR, NOT, NAND, and NOR gates simultaneously or individually. It is a kind of promising device for next generation logic optical circuits, ultrahigh speed signal processing, and future Si-based all-optical integrated circuits.

©2005 Optical Society of America

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Figures (3)

Fig. 1.
Fig. 1. Schematic diagram of the proposed all-optical logic gate.
Fig. 2.
Fig. 2. Cross section view of the waveguide.
Fig. 3.
Fig. 3. BPM simulated optical fields with incident light beams having same wavelength and polarization.

Tables (7)

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Table 1. OR Logic Gate

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Table 2.1. NOT Logic Gate

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Table 2.2. NOT Logic Gate

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Table 2.3. NOT Logic Gate

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Table 2.4. NOT Logic Gate

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Table 3. NAND Logic Gate

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Table 4. NOR Logic Gate

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

a b ( q + 4 π b 4 π b ) 1 + 0.3 ( q + 4 π b q + 4 π r b ) 2 1 ( q + 4 π b q + 4 π r b ) 2 1
q = γ 0 n 1 2 n 0 2 + γ 2 n 1 2 n 2 2
2 ψ x 2 + 2 ψ y 2 + [ 2 π n ( x , y ) λ ] 2 ψ = β 2 ψ
ψ ( x , y , z ) = ν = 0 m 1 C ν ψ ν ( x , y ) exp [ j ( ω t β ν z ) ]
L = p ( 3 L π ) p = 0 , 1 , 2 ,
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