Wavelength detuning of DFB laser incorporating compressively strained MQW and automatically buried absorptive grating

Jae Ho Han, Sung Woong Park

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    The thermal effect on wavelength detuning of the uncooled packaged complex (loss)-coupled distributed feedback (DFB) edge emitting 1.55-μm laser has been investigated for wide temperature range of -40 °C to 85 °C. The InGaAsP/InP laser diode incorporates a thin 1% compressively strained multiple quantum well (MQW) structure as well as an automatically buried InAsP buried layer in the grating region to simplify the steps of the epitaxial growth during the fabrication processes. As an experimental result, it has been found that the wavelength detuning between the gain medium (Fabry-Perot cavity) and the Bragg grating (for distributed feedback) should be optimized around -10 nm at the room temperature to accommodate their differently shifting center wavelengths for temperature changes where the gain profile changes faster than DFB wavelength for predicting a single mode operation in a wide temperature range. Based on the measured optical characteristics (threshold current, slope efficiency) of the fabricated diode laser, the characteristic temperature was estimated to be approximately 46 K and the slope efficiency ratio between room and high temperatures was around 70%.

    Original languageEnglish
    Pages (from-to)64-66
    Number of pages3
    JournalOptik
    Volume124
    Issue number1
    DOIs
    Publication statusPublished - 2013 Jan

    Bibliographical note

    Funding Information:
    This research was supported by World Class University program funded by the Ministry of Education, Science and Technology through the National Research Foundation of Korea ( R31-10008 ). This research was also supported in part by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0010823).

    Keywords

    • DFB laser
    • Optical characteristics
    • Thermal effect
    • Wavelength detuning

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics
    • Electrical and Electronic Engineering

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