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A waveguide directional coupler with a nonlinear coupling medium

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3 Author(s)
P. R. Berger ; AT&T Bell Lab., Murray Hill, NJ, USA ; P. K. Bhattacharya ; S. Gupta

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 3×104 W/cm2. Modeling of the device shows that n2=1.88×10-8 cm 2/W and α=12.9 cm-1

Published in:

IEEE Journal of Quantum Electronics  (Volume:27 ,  Issue: 3 )