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Optical Fiber Communication Conference

Optical bistability in quantum well devices

Hyatt M. Gibbs, G. Khitrova, S. W. Koch, Nasser N. Peyghambarian, Dror Sarid, Arturo Chavez-Pirson, A. JEFFREY, S. H. Park, Mial E. Warren, Wayne M. Gibbons, K. Komatsu, Y. H. Lee, David M. Hendricks, Jean Francois Morhange, Arthur C. Gossard, W. Wiegmann, Masahiro Sugimoto

Published Jan 1, 1988• 0 citations
Publisher

Abstract

Nonlinear optics can be used to make all-optical decisions for optical signal processing or optical computing or to switch light beams for optical communications.1 Nonlinear Fabry-Perot etalons permit many decision-making elements to operate in parallel. Nonlinear waveguide devices such as directional couplers or Mach-Zehnder interferometers may someday permit very rapid switching or processing of pipelined data.

DOI
10.1364/ofc.1988.wj3

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Nonlinear optics can be used to make all-optical decisions for optical signal processing or optical computing or to switch light beams for optical communications.1 Nonlinear Fabry-Perot etalons permit many decision-making elements to operate in parallel. Nonlinear waveguide devices such as directional couplers or Mach-Zehnder interferometers may someday permit very rapid switching or processing of pipelined data.
This article describes the application of one type of optical bistable device based on gallium arsenide as the nonlinear medium. The authors discuss several possible operations with GaAs nonlinear Fabry-Perot etalons. This article utilizes a recently developed computer model to illustrate the basic operating principles and applications. The authors mainly concentrate on the device operation itself. In keeping with common practice they use the term optical bistable device when referring to a device that can exhibit optical bistability even when not being used in such a manner. Instead of the expression nonlinear Fabry-Perot etalon, they often use nonlinear etalons or etalon devices.
In this paper we consider the nonlinear Fabry-Perot and its applications to optical signal and image processing. This paper addresses the signal processing aspects of a nonlinear Fabry-Perot interferometer with emphasis on image processing. The device geometry is shown in Figure 1. A thin nonlinear medium, whose refractive index is a function of the light intensity inside the Fabry-Perot is sandwiched between two plane parallel mirrors. The output as a function of input is shown in Fig. 2, for two different values of the difference between the Fabry-Perot low intensity resonance and the incident wavelength. The bistable curve in 2a is the origin of the term optical bistability and makes possible an optical memory, in which the output is a function of the history of the device. The Figure 2b represents a typical nonlinear transfer curve which may be used for signal processing. It can be seen that small changes in the input intensity Ic make large changes in the output intensity.
In this paper we present the basic principles of optical bistability and summarize the current advances in semiconductor optical switching, with emphasis on recent results in GaAs, CuCI, InAs, InSb, CdS, ZnS, and ZnSe etalons. These devices have great potential for applications involving optical signal processing and computing. As an example, we discuss the use of arrays of bistable devices for parallel optical processing and for addressable spatial light modulators. The use of nonlinear etalons as optical gates is also illustrated. To date, GaAs devices have shown the most favorable characteristics for practical applications. They operate at room temperature with a few milliwatts of power using a laser diode as the only light source. Quasi-cw operation and optical fiber signal regeneration have also been demonstrated. A GaAs NOR gate operates in 1 ps with <3 pJ incident energy; this, of course, implies a 1 ps switch-on time for a bistable etalon.
Nonlinear semiconductor waveguides are investigated with respect to their use for optical bistability and temporal optical switching with results given for silicon-on-sapphire devices. The performance of the waveguides is assessed with comparisons to nonlinear Fabry-Perot cavities, and the conditions for optical bistability are theoretically shown to be possible by combining a waveguide and a diffraction-grating coupler. Structures experimentally investigated include semiconductor layers epitaxially grown on substrates having low refractive indices. Optical switching is reported on reflected or transmitted beams and on the guided-wave intensity by means of excitation pulses in the nanosecond or picosecond range. The data confirm the usefulness of nonlinear waveguides as alternative devices for temporal optical switching and logic-gate development in part due to their good switching times.
When the output parameter of an optical device could be a multivalued function of the input parameter, this device can be working in an optical bistable status. The most typical optical bistable device is a Fabry–Perot cavity containing a nonlinear optical medium, the refractive index of which depends on the light intensity. Upon the action of an intense input optical beam, the transmitted (or reflected) intensity of this device may exhibit a nonlinear response to the incident light intensity variation and, especially under appropriate working conditions, the characteristic output/input curve may manifest a single (or multiple) hysteresis loop(s). Such type of optical bistable device can be used as an optical differential amplifier, optical switch, optical limiter, optical clipper, optical discriminator, or an optical memory element, depending on the chosen nonlinear medium and operation conditions.