Decay (organic) Electric conductivity Heterojunctions Lasers Modulation Photons Semiconductor materials Analytical solutions Carrier decays Carrier densities Direct modulations Electrical fields
Issue Date:
2008
Publisher:
Proceedings - 2008 International Conference on Advanced Technologies for Communications, ATC 2008, Held in Conjunction with REV Meeting
Citation:
Page : 371-375
Abstract:
We studied the rate equations of a semiconductor laser operating in a direct modulation mode for
the purpose of obtaining the direct dependence of output photon density on modulating current. We show
that the system of differential equations may be reduced to a special case when the spontaneous carrier
decay rate is equal to the photon decay rate. The unique solution is obtained for this case. We also show that
a laser operating in direct modulation exhibits an inertia in switching between the optical and electrical
fields which introduces a corresponding loss in the modulating current. The output photon density and the
input carrier density depend directly on this loss. For the systems with a minimal and maximal loss, the
output photon density can be obtained analytically. ?? 2008 IEEE.
