1.55 mum gain-coupled quantum-well distributed feedback lasers with high single-mode yield and narrow linewidth

The fabrication and characteristics of gain-coupled 1.55-mum GaInAlAs quantum-well metal-clad ridge-waveguide distributed-feedback lasers are discussed. The gain-coupling mechanism was provided by a thin ternary loss grating layer with an estimated gain-coupling strength of about 30/cm. For as-cleav...

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Published inIEEE photonics technology letters Vol. 3; no. 11; pp. 955 - 957
Main Authors Borchert, B, David, K, Stegmuller, B, Gessner, R, Beschorner, M, Sacher, D, Franz, G
Format Journal Article
LanguageEnglish
Published 01.11.1991
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Summary:The fabrication and characteristics of gain-coupled 1.55-mum GaInAlAs quantum-well metal-clad ridge-waveguide distributed-feedback lasers are discussed. The gain-coupling mechanism was provided by a thin ternary loss grating layer with an estimated gain-coupling strength of about 30/cm. For as-cleaved devices, the single-mode yield was as high as 70 and 95% for 600- and 800-mum-long devices, respectively. Typical threshold currents were 40 and 55 mA, respectively. Both the high single-mode yield and the pronounced asymmetric spectra were calculated theoretically and give a strong indication that a significant amount of gain coupling was realized in the laser structure. For a 600-mum-long device, a continuous-wave (CW) output power of 10 mW and a minimum linewidth of 1.6 MHz were measured
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ISSN:1041-1135
DOI:10.1109/68.97824