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HRXRD scan of the QW calibration structure, showing clear peaks for the GaAs substrate, metamorphic buffer and claddings, and superlattice fringes from the quantum wells.
Cross-section scanning-electron micrograph of an LC-DFB laser. Inset (a) micrograph of etched waveguide gratings prior to SiNx and BCB coating. Inset (b) transmission electron micrograph of the IMF array at the GaSb/GaAs interface. The bright and dark fringes are indicative of the regularly spaced dislocations.
(a) The light-current-voltage plot of a LC-DFB laser operating CW at different heat-sink temperatures. The solid portions of the power curves indicate single-mode operation with a SMSR of at least 19 dB. (b) A representative output spectrum of a LC-DFB laser biased with 650 mA showing a single longitudinal mode operation with a SMSR of 25 dB.
(a) Temperature variation of the lasing wavelength for the LC-DFB lasers. The inset shows the spectrum of laser at each temperature. (b) Emission wavelength shift as a function of drive current. The inset shows the spectrum of laser at each drive current.
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