A waveguide directional coupler with a nonlinear coupling medium

An all-optical switch using a waveguide directional coupler with a nonlinear coupling medium is shown. At low input power, it performs as a linear directional coupler; but at higher input powers, the coupling length increases, thus reducing coupling. For coupling lengths near multiples of the linear...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 1991-03, Vol.27 (3), p.788-795
Main Authors: Berger, P.R., Bhattacharya, P.K., Gupta, S.
Format: Article
Language:English
Subjects:
Absorption
Applied sciences
Circuit properties
Directional couplers
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Excitons
Integrated optics. Optical fibers and wave guides
Linearity
Optical and optoelectronic circuits
Optical coupling
Optical switches
Optical waveguides
Quantum well devices
Resonance
Tellurium
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Summary:An all-optical switch using a waveguide directional coupler with a nonlinear coupling medium is shown. At low input power, it performs as a linear directional coupler; but at higher input powers, the coupling length increases, thus reducing coupling. For coupling lengths near multiples of the linear coupling length, switching can occur from a crossed-over state at low power to a straight-through condition at higher input power. A theoretical analysis which describes the behavior is developed. A nonlinear coupler was fabricated which exhibited switching at 45.6 meV below the exciton resonance with a critical intensity of 3*10/sup 4/ W/cm/sup 2/. Modeling of the device shows that n/sub 2/=1.88*10/sup -8/ cm/sup 2//W and alpha =12.9 cm/sup -1/.< >
ISSN:0018-9197
1558-1713
DOI:10.1109/3.81390