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Modulation bandwidth optimisation for unipolar intersubband semiconductor lasers

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3 Author(s)
Cheung, C.Y.L. ; School of Electron. Eng. & Comput. Syst., Univ. of Wales, Bangor, UK ; Spencer, P.S. ; Shore, K.A.

A rate equation analysis of the direct current modulation response of intersubband semiconductor lasers is reported using a rate equation model for a triple quantum well structure. It is demonstrated that terahertz modulation bandwidths may be achievable due to the picosecond carrier lifetimes which are characteristic of such structures. A novel feature of the modulation response of intersubband semiconductor lasers is the existence of an optimum output power for achieving maximum modulation bandwidth in a given structure. Further optimisation of the modulation performance is achievable via appropriate design of the coupled quantum well structure

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Optoelectronics, IEE Proceedings -  (Volume:144 ,  Issue: 1 )