DocumentCode :
2921527
Title :
Digital response in an all optical AND gate using parametric (/spl chi//sup (2)/) solitons
Author :
Collecutt, G.R. ; Drummond, P.D.
Author_Institution :
Dept. of Phys., Queensland Univ., Qld., Australia
fYear :
2000
fDate :
7-12 May 2000
Firstpage :
194
Abstract :
Summary form only given. The main problem with optical logic is that the operation of a logic gate that works on two inputs is essentially a nonlinear process, whereas electromagnetic waves in most media are solutions to the linear Maxwell equations; in most dielectrics light does not interact with itself. However, in recent years there has been considerable advances in the theory and manufacture of nonlinear optical media, which now opens a new and exciting range of possibilities for implementing all optical logic circuits. One such possibility is the implementation of an all-optical AND gate as proposed by Drummond et al. (1999). In this method the two optical inputs are collided noncollinearly in a dispersive parametric planar waveguide. Consider firstly type II interaction in which the pulses have orthogonal polarizations. If only one pulse at a time is injected into the waveguide then it simply disperses. Whereas if two pulses arrive simultaneously then when they collide a phase-matched second harmonic is generated that traps the original two fundamentals, forming a 2+1D spatiotemporal soliton, which propagates stably towards the logic true output. Finally, it is also apparent that when no pulse is present on either input then no output will be generated. In this fashion AND gate logic operation is achieved. For such 2+1D solitons to form the basic requirements are anomalous dispersion and (nearly) matched group velocities at the fundamental and second harmonic frequencies.
Keywords :
optical harmonic generation; optical logic; optical phase matching; optical planar waveguides; optical solitons; 2+1D spatiotemporal soliton; all-optical AND gate; anomalous dispersion; digital response; dispersive parametric planar waveguide; logic true output; matched group velocities; optical logic gate; parametric second-order solitons; phase-matched second harmonic; Dielectrics; Electromagnetic scattering; Electromagnetic waveguides; Logic gates; Maxwell equations; Nonlinear optics; Optical pulses; Optical solitons; Optical waveguides; Pulse generation;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Lasers and Electro-Optics, 2000. (CLEO 2000). Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
1-55752-634-6
Type :
conf
DOI :
10.1109/CLEO.2000.906900
Filename :
906900
Link To Document :
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