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High-power single-mode operation in DFB and FP lasers using diffused quantum-well structure

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3 Author(s)
Yu, S.F. ; Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong ; Lo, C.W. ; Li, E.H.

Distributed feedback (DFB) and Fabry-Perot (FP) semiconductor lasers with step and periodic interdiffusion quantum-well structures are proposed for high-power single-longitudinal-mode operation. It is shown that the phase-adjustment region formed by the diffusion step (i.e., step change in optical gain and refractive index) counteracts the influence of spatial hole burning, especially for DFB lasers with large coupling-length products biased at high injection current. Furthermore, it is found that with careful design of the diffusion grating (i.e., grating period and amount of diffusion extent) of FP lasers, side-mode suppression ratio can be enhanced and threshold current density can be minimized to a satisfied level

Published in:

Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 6 )

Date of Publication:

Jun 1997

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