Title

130 Ps Recovery Of All-Optical Switching In A Gaas Multiquantum Well Directional Coupler

Title - Alternative

Appl. Phys. Lett.

Abstract

A significantly improved recovery time of 130 ps has been achieved in an all-optical zero-gap directional coupler containing multiple quantum wells. The mechanism for the all-optical switching is due to free-carrier induced refractive nonlinearities at near-band-gap resonant frequencies. The large reduction in the switch recovery time was obtained by the application of an external dc bias which sweeps out the carriers from the quantum wells. From our experimental results on the laser pulse width limited switch-up time of 2 ps, we deduce that the contribution of self-electro-optic effect nonlinearity is negligible in this case.

Publication Title

Applied Physics Letters

Volume

58

Issue/Number

19

Publication Date

1-1-1991

Document Type

Article

Language

English

First Page

2055

Last Page

2057

WOS Identifier

WOS:A1991FL31700001

ISSN

0003-6951

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