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Narrow spectral linewidth 1.5 μm GaInAsP/InP distributed Bragg reflector (DBR) lasers

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6 Author(s)
Takahashi, Mitsuo ; Sumitomo Electr. Ind. Ltd., Osaka, Japan ; Michitsuji, Y. ; Yoshimura, M. ; Yamazoe, Y.
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The spectral linewidth of distributed Bragg reflector (DBR) lasers is discussed. The narrowest linewidth of 3.2 MHz was obtained at P =1.5 mW. It was found that narrow spectral linewidths can be obtained constantly for the DBR lasers with long and low optical loss corrugation regions, and with a small coupling coefficient. These results are explained by the external cavity model, which is used in the theoretical analysis. To increase the output power of the narrow-linewidth DBR lasers, AR (antireflection) coating was applied to the output facet. Improved quantum efficiency and submode suppression were achieved. Degradation of the linewidths by the AR coating was insignificant

Published in:

Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 6 )

Date of Publication:

Jun 1989

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