Direct modulation of excited state quantum dot lasers

Stevens, B. J.; Childs, D. T. D.; Shahid, H.; Hogg, R. A.
August 2009
Applied Physics Letters;8/10/2009, Vol. 95 Issue 6, p061101
Academic Journal
The use of the excited state quantum dot lasers for high speed direct modulation is proposed and demonstrated. A direct comparison of lasers utilizing the ground state and excited state from the same laser material reveals a factor of two increase in the K-factor limited bandwidth. This is attributed to an increase in the saturated gain and reduced carrier scattering time of the excited state compared to the ground state.


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