Ultrafast signal processing in quantum dot amplifiers through effective spectral holeburning

Tommy Winther Berg, Jesper Mørk, A. V. Uskov

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    Abstract

    Significant progress has been obtained on quantum dot (QD) lasers, but the possible advantages of QD amplifiers are not yet clear. We show here that a relatively slow coupling between the optically active QD carrier states and the surrounding carrier reservoir can lead to efficient gain modulation suitable for ultrafast signal processing. The basis of this property is that the process of spectral hole burning (SHB) can become very effective. We consider a traveling wave optical amplifier consisting of the dot states, which interact with the optical signal (no inhomogeneous broadening included), and the wetting layer (WL), where current is injected. Time evolution is described by two coupled rate equations. Carrier capture from WL to dots is characterized by the capture time /spl tau//sub 0/.
    Original languageEnglish
    Title of host publicationSummaries of Papers Presented at the Lasers and Electro-Optics, 2002. CLEO '02. Technical Digest.
    Number of pages662
    Volume1
    PublisherIEEE
    Publication date2002
    ISBN (Print)1-55752-706-7
    DOIs
    Publication statusPublished - 2002
    EventConference on Lasers and Electro-Optics 2002 - Long Beach, CA, United States
    Duration: 19 May 200224 May 2002

    Conference

    ConferenceConference on Lasers and Electro-Optics 2002
    Country/TerritoryUnited States
    CityLong Beach, CA
    Period19/05/200224/05/2002

    Bibliographical note

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