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Feasibility study on the application of the quantum disk to the gain-coupled distributed feedback laser

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1 Author(s)
Susa, N. ; NTT Opto-Electron. Labs., Kanagawa, Japan

This numerical study investigated the possibility of using quantum disks in a gain-coupled distributed feedback (DFB) laser, specifically whether the laser would oscillate when the number of electrons in a disk (Nth) is less than the maximum possible number of electrons in the disk (i.e., oscillate at a threshold material gain (gth) less than the maximum peak material gain for each quantum disk). The influences of the disk diameter and thickness, the number of disks stacked vertically in a layer (Nst), the device length, the period perpendicular to the light propagation direction, and facet reflectivity on the gth, the threshold current density (Jth), and the normalized gain-coupling coefficient (KgL) were also examined. When Nst is increased, gth decreases to less than the value estimated when assuming that the product of gth and Nst is constant. Although closely spaced disks are useful for reducing gth , there is an optimum disk distribution minimizing Jth, and this distribution depends on the parameters described above. The J th also depends on the disk size and is smallest when the diameter is 6 nm. The magnitude of KgL is about 0.76 and is independent of the height of the gain grating (i.e., Nst), but it can be controlled by adjusting the disk diameter and the facet reflectivity

Published in:

Quantum Electronics, IEEE Journal of  (Volume:34 ,  Issue: 8 )