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

The fabrication and characteristics of gain-coupled 1.55- mu m 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-cle...

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Bibliographic Details
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 IEEE 01.11.1991
Subjects
Distributed feedback devices
Gratings
Laser feedback
Laser theory
Optical coupling
Optical device fabrication
Power generation
Power measurement
Quantum well lasers
Threshold current
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Summary:The fabrication and characteristics of gain-coupled 1.55- mu m 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- mu m-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- mu m-long device, a continuous-wave (CW) output power of 10 mW and a minimum linewidth of 1.6 MHz were measured.< >
ISSN:1041-1135
1941-0174
DOI:10.1109/68.97824