Accession Number : ADP008171

Title :   All-Optical Switching Using Dispersive Nonlinearities in InGaAs/GaAs Single Quantum Well Laser Diodes,

Corporate Author : UNIVERSITY OF CENTRAL FLORIDA ORLANDO CENTER FOR RESEARCH IN ELECTRO-OPTICS A ND LASERS

Personal Author(s) : Wa, P. K. ; Kao, T. W. ; Miller, A. ; Ogawa, M. ; Park, R. M.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : All optical switching due to nonlinear Fabry-Perot modulation has been obtained in laser diodes electrically biased below lasing threshold. The advantage of such devices over their passive counterparts is the realization of amplification of the input optical signal. This eliminates the problem of fan-out capabilities of all-optical switching devices. The mechanism for the nonlinear refraction arises through gain saturation by optical depletion of carriers. The structure used in the measurements was grown on a n-doped GaAs substrate by molecular beam epitaxy and comprised a single 50A thick undoped In0.2Ga0.8As quantum well layer sandwiched between undoped GaAs layers each 0.1 micrometer thick. Due to the significant lattice mismatch between the In0.2Ga0.8As quantum well and the GaAs barrier, in plane biaxial compressive strain is present in the quantum well. The cladding layers of Al0.2Ga0.8As on either side of the core were doped n-type and p-type respectively. The top layer was capped by 0.1 micrometer p+-GaAs layer. Gold stripes each 100 micrometers wide were deposited on the surface and the laser diodes were cleaved to a length of 500 micrometers.

Descriptors :   *OPTICAL SWITCHING, *OPTICAL CIRCUITS, *LIGHT MODULATORS, AMPLIFICATION, BARRIERS, CLADDING, CORES, DEPLETION, DIODES, FANS, GAIN, GALLIUM ARSENIDES, GOLD, INPUT, LAYERS, LENGTH, MEASUREMENT, MICROMETERS, MODULATION, MOLECULAR BEAMS, REFRACTION, SATURATION, SIGNALS, STRUCTURES, SUBSTRATES, SURFACES, LASER APPLICATIONS.

Subject Categories : Electrooptical and Optoelectronic Devices
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE