In this paper, we report on all-optical switching using ultrafast optical nonlinearities originating from intersubband transitions (ISB-Ts) in InGaAs/AlAsSb quantum wells. The use of coupled double quantum wells (C-DQWs) for ISB-T-based all-optical switching is proposed, and its advantages are discussed. Sub-picosecond responses of C-DQW are simulated by rate equation analysis and measured using pump-probe experiments. We describe demonstrations of all-optical demultiplexing from 1 Tb/s signal pulse trains and reshaping/retiming functions at the optical-communication wavelength of 1.55 /spl mu/m, using an InGaAs/AlAsSb C-DQW waveguide. We also report on our recent attempts to improve ISB-T characteristics using a novel InGaAs/AlAs/AlAsSb quantum well structure, which led to the observation of an ultra-low absorption saturation intensity of 3 fJ//spl mu/m/sup 2/.


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    Title :

    Ultrafast all-optical switching using near-infrared intersubband transitions in quantum wells


    Contributors:
    Yoshida, H. (author) / Gopal, A.V. (author) / Simoyama, T. (author) / Mozume, T. (author) / Ishikawa, H. (author) / Asakawa, K. (author)


    Publication date :

    2002-01-01


    Size :

    152376 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English